JP2011057005A - Method of detecting rail breakage and rail breakage detection system - Google Patents

Abstract

An object of the present invention is to ensure the safety of train operation by reliably detecting the occurrence of rail breakage in a circulating electric path.
In each track circuit of the rail breakage detection system, a transmission unit includes a track circuit ID, which is identification information of the track circuit, included in the track circuit signal, and the reception unit is transmitted by the transmission unit. The transmitted track circuit signal is received. The receiving unit 20 extracts a signal having a frequency assigned to the own track circuit and another track circuit in the circulating electrical path from the received signal. Then, the signal level of the extracted signal is detected and output to the processing unit 30. When the signal level of the signal of the frequency of the other track circuit output from the receiving unit 20 exceeds a predetermined allowable level, the processing unit 30 performs demodulation processing on the signal to obtain the track circuit ID. Then, it is estimated that an abnormality has occurred in the other track circuit of the acquired track circuit ID. Then, the communication unit 40 notifies the possibility of rail breakage by transmitting an abnormality estimation signal to the other track circuit of the track circuit ID.
[Selection] Figure 1

Description

  The present invention relates to a rail breakage detection method and a rail breakage detection system.

  When a train enters the track circuit, the track of the signal sent from the sending end side of the track circuit is short-circuited between the left and right rails by the wheel shaft of the vehicle and the axle. This is a device that detects that a train is present in the track circuit by utilizing the fact that the power reception level on the receiving side of the circuit is lowered. A device using a track relay is known for detecting a decrease in power reception level.

  In addition, the track circuit is designed so that fail-safety is ensured even when an event such as a failure of a power transmission device, a power failure, a wire breakage, or a rail breakage occurs. That is, when the above-described event occurs, the signal transmission path is opened, so that the power reception level detected on the receiving side of the track circuit decreases, and it is determined that there is a line. In this case, since the control is performed to display the stop signal on the traffic light, entry of the train into the track circuit is suppressed, and safe control is realized.

  As a technique related to the safety of train operation, for example, Patent Document 1 discloses a technique for detecting rail breakage in a three-wire track circuit.

JP-A-10-53134

  Normally, when an event such as a rail break occurs, the signal transmission path is opened as described above, and the power reception level detected on the receiving side of the track circuit is lowered. However, if there is an electrical path other than the electrical path between the transmission side and the reception side formed in one track circuit (hereinafter referred to as “detour”), a signal flows through the electrical path, The power reception level detected on the receiving side may not be sufficiently reduced. In other words, when there is an electrically conducting portion other than the portion where the rail breakage occurs, a signal flows around the conducting portion and the power receiving level may not be lowered.

  For example, an annular electrical path (hereinafter referred to as “circular electrical path”) formed by two cross-bonds and two sets of adjacent lines is an example of a detour. Impedance bonds are provided at the boundary portions of the track circuits so that only two return currents flow to the adjacent track circuits while maintaining the track circuit boundaries electrically by providing two sets with rail insulation. Some impedance bonds are configured with cross bonds that connect the adjacent lines via impedance bonds in order to reduce the return circuit resistance of the train current and eliminate the potential difference between the adjacent lines. ing.

  A circulating electrical path is formed by the two cross bonds and two sets of lines. Depending on the circulating electrical path, the power receiving level on the power receiving side may not be sufficiently reduced in each track circuit constituting the circulating electrical path. For this reason, when providing a cross bond, it is generally better to separate at least two track circuits or more. However, when the signal attenuation in the circulating electrical path is small, it cannot be said that the safety and reliable operation of the track relay can be guaranteed if the cross bonds are simply provided at least two track circuits apart. For example, a place where a resonance capacitor is installed to prevent a short circuit failure due to weight reduction of the vehicle and measures for improving the voltage between rails are taken. If there is a situation where the power reception level does not fall down, it is determined that there is no existing line, so train entry into the section is permitted. In this case, if a train enters the section, a derailment accident or the like may occur, which is extremely dangerous.

  The present invention has been made in view of the above-described problems, and its object is to ensure the safety of train operation by reliably detecting the occurrence of rail breakage in the circulating electrical path. .

The first form for solving the above problems is:
The track circuit signal transmitted from the transmitting unit (for example, the transmitting unit 50 in FIGS. 1 and 4) through the rail is received by the receiving unit (for example, the receiving unit 20 in FIGS. 1 and 4), and the signal is received. Two tracks (for example, the A line and the B line in FIG. 1) provided alongside the track circuit (for example, the track circuits A1 to B2 in FIG. 1) for detecting the train based on the respective lines A rail breakage detection method for detecting the occurrence of a rail breakage in a circulating electrical path formed by being electrically connected at two locations via impedance bonds (for example, impedance bonds 901A to 923B in FIG. 1). ,
Each track circuit in the reflux electrical path is
The transmitter transmits the track circuit identification information (for example, track circuit ID 311 in FIG. 5) in the track circuit signal,
An other circuit signal extraction step (for example, the receiving unit 20 in FIGS. 1 and 4) for extracting the track circuit signal of the other track circuit from the signals received by the receiving unit;
Based on the signal level of the extracted track circuit signal of the other track circuit, an estimation step (for example, step A1 in FIG. 6) for estimating the possibility of breakage of the rail of the other track circuit;
A specific step (for example, step A3 in FIG. 6) for identifying the other track circuit based on the identification information included in the extracted track circuit signal of the other track circuit;
A notification step (for example, step A7 in FIG. 6) for notifying the other track circuit identified in the specifying step of a fracture occurrence estimation signal when it is estimated that there is a possibility of fracture in the estimation step;
A notification acquisition step (for example, step A11 in FIG. 6) for acquiring that the fracture occurrence estimation signal has been notified from another track circuit toward the track circuit;
Break determination step (for example, steps A17 to A53 in FIGS. 6 and 7) for determining occurrence of a rail break in the track circuit using the acquisition result of the notification acquisition step;
Run
A rail breakage detection method for detecting occurrence of a rail breakage in each track circuit in the circulating electric path.

As another form,
The track circuit signal transmitted from the transmission unit through the rail is received by the reception unit, and the two track lines provided alongside the track circuit configured to detect the train based on the reception state of the signal, A rail breakage detection system (for example, the rail breakage detection system 1 in FIG. 1) that detects the occurrence of a rail breakage in a circulating electric path formed by being electrically connected at two locations via an impedance bond. ,
Each track circuit in the reflux electrical path is
The transmitter transmits the track circuit identification information included in the track circuit signal,
An other circuit signal extracting unit (for example, the receiving unit 20 in FIGS. 1 and 4) for extracting a track circuit signal of another track circuit from the signals received by the receiving unit;
Based on the signal level of the extracted track circuit signal of the other track circuit, an estimation unit (for example, the processing unit 30 in FIGS. 1 and 4) that estimates the possibility of breakage of the rail of the other track circuit;
A specifying unit (for example, the processing unit 30 in FIGS. 1 and 4) that specifies the other track circuit based on the identification information included in the track circuit signal of the extracted other track circuit;
When the estimation unit estimates that there is a possibility of fracture, a notification unit (for example, the processing unit 30 and the communication unit in FIGS. 1 and 4) notifies the other track circuit identified by the identification unit of a fracture occurrence estimation signal. 40)
A notification acquisition unit (for example, the processing unit 30 and the communication unit 40 in FIGS. 1 and 4) for acquiring that the fracture occurrence estimation signal has been notified from another track circuit toward the track circuit;
A break determination unit (for example, the processing unit 30 in FIGS. 1 and 4) that determines the occurrence of a rail break in the track circuit using the acquisition result of the notification acquisition unit;
Have
You may comprise the rail fracture detection system which detects generation | occurrence | production of the rail fracture in each track circuit in each said circulating electrical path in each said track circuit.

  According to the first form and the like, in the circulating electrical path, the transmission unit of each track circuit transmits the track circuit identification information included in the track circuit signal. Then, the track circuit signal of the other track circuit is extracted from the signals received by the receiving unit, and the possibility of breakage of the rail of the other track circuit is estimated based on the signal level. Each track circuit identifies the other track circuit based on the identification information included in the extracted track circuit signal of the other track circuit, and when it is estimated that there is a possibility of breakage, the track circuit breaks into the other track circuit. An occurrence estimation signal is notified. Then, the fact that the fracture occurrence estimation signal has been notified from the other track circuit to the track circuit is acquired, and the occurrence of the rail break in the track circuit is determined using the acquired result.

  When a break occurs in the rail of the other track circuit included in the reflux electrical path, the track circuit signal of the other track circuit bypasses the reflux electrical path and flows into the track circuit. Therefore, if the signal level of the other track circuit is high as a result of extracting the signal of the other track circuit from the signals received by the receiving unit of the own track circuit, it can be estimated that the rail of the other track circuit is broken. it can. In this case, it is possible to notify the other track circuit of the possibility of the rail breakage by notifying the other track circuit of the break occurrence estimation signal. On the other hand, if the notification of the fracture occurrence estimation signal is received from another track circuit, the track circuit may determine that the rail may be broken and check whether the track circuit is broken or not. Is appropriate. Thus, the track circuits in the circulating electrical path mutually monitor and communicate the rail breakage, thereby reliably detecting the rail breakage in the circulating electrical path and ensuring the safety of the train operation.

Further, as a second form, the rail breakage detection method of the first form,
Each track circuit in the reflux electrical path is
A control relay unit (for example, the signal control of FIGS. 1 and 4) that controls the traffic signals (for example, the signals A1-2 to B2-2 of FIG. 1) of the track circuit based on the reception state of the track circuit signal of the track circuit. Relay section 60),
When it is determined in the break determination step that rail breakage has occurred, whether or not the rail breakage detection by the track circuit is functioning normally is diagnosed based on the control state of the traffic light by the control relay unit. Further executing a diagnostic step (for example, steps A19 to A23 in FIG. 6),
A rail breakage detection method may be configured.

  According to this 2nd form, each track circuit in a reflux electric path is provided with the control relay part which controls the signal apparatus of the said track circuit based on the reception state of the track circuit signal of the said track circuit. When it is determined that the rail breakage has occurred, it is diagnosed based on the control state of the traffic signal by the control relay unit whether the rail breakage detection by the track circuit is functioning normally.

  If it is determined that a rail break has occurred, and if the control relay is operating so that the traffic signal is stopped, it is determined that the detection of the rail break by the track circuit is functioning normally. Can do. However, if it is determined that a rail break has occurred and the control relay is not operating so that the traffic signal is stopped, the rail break detection by the track circuit is not functioning properly. Conceivable. In this case, it is preferable to have a configuration that prompts the inspection of the track circuit by, for example, transmitting a predetermined notification signal or turning on a lamp that reports an abnormality.

Further, as a third form, the rail breakage detection method of the second form,
Each track circuit in the reflux electrical path is
In the break determination step, when it is determined that a rail break has occurred and the control relay unit does not control the traffic light to stop display, a current control step (for example, controlling the traffic signal to stop display) Steps A39 and A47) of FIG. 7 are further executed.
A rail breakage detection method may be configured.

  According to the third embodiment, when it is determined that the rail breakage has occurred and the control relay unit does not control the traffic light to the stop indication, the traffic light is controlled to the stop indication. The approach of the train to the generated section is suppressed and the control on the safe side is realized.

Further, as a fourth form, the rail breakage detection method of any one of the first to third forms,
Each track circuit in the reflux electrical path is
An own circuit signal extracting step (for example, the receiving unit 20 in FIG. 4) for extracting the track circuit signal of the track circuit from the signals received by the receiving unit;
A storage step (for example, the processing unit 30 of FIG. 4; own circuit signal level history information 37) for historically storing the signal level of the track circuit signal extracted in the own circuit signal extraction step;
A sudden drop detecting step (for example, step A45 in FIG. 7) for detecting that the signal level stored in the storing step is continuously in an unrecovered state after a change that satisfies a predetermined sudden drop condition;
And execute
In the rupture determination step, when the other track circuit that is the notification source of the rupture occurrence estimation signal detected in the notification detection step is another track circuit adjacent to the track circuit on the same line, the sudden drop detection step is detected. Sometimes it is determined that rail breakage has occurred in the track circuit, and when there is no detection, it is determined that insulation bridge has occurred (for example, steps A49 and A53 in FIG. 7),
A rail breakage detection method may be configured.

  According to the fourth embodiment, each track circuit in the circulating electrical path extracts the track circuit signal of the track circuit from the signal received by the receiving unit, and stores the signal level in a historical manner. . Then, after the stored signal level changes to satisfy a predetermined sudden decrease condition, it is detected that the signal is continuously in an unrecovered state, and the other track circuit that is the notification source of the fracture occurrence estimation signal is the same line In the case of another track circuit adjacent to the track circuit, it is determined that a rail breakage has occurred in the track circuit, and if there is no detection, it is determined that an insulation bridge has occurred.

  If the notification of the fracture occurrence estimation signal is received from another track circuit adjacent to the track circuit on the same track, the track circuit signal of the track circuit has flowed into the other track circuit. It is conceivable that the rail is broken or the insulation bridge is generated due to destruction of the rail insulation provided at the boundary between the own track circuit and the other track circuit. When the rail breaks, the electric resistance becomes high at the broken portion, so that it becomes difficult for a signal to flow through the track circuit, and the signal level of the track circuit signal of the track circuit decreases. In addition, the signal level remains lowered until the broken part is repaired, and it does not recover to the original signal level. Therefore, it is possible to detect rail breakage by detecting a decrease in signal level and non-recovery. Can do. On the other hand, if a decrease in signal level and no recovery are not detected, it is appropriate to determine that an insulation bridge has occurred and the track circuit signal of the track circuit has flowed out.

Further, as a fifth form, the rail breakage detection method according to any one of the first to fourth forms,
In the rupture determination step, when the other track circuit that is the notification source of the rupture occurrence estimation signal detected in the notification detection step is another track circuit that is not adjacent to the other track circuit of the side track or the track circuit of the same track, the track It is determined that rail breakage has occurred in the circuit (for example, step A37 in FIG. 7; Yes, A41),
A rail breakage detection method may be configured.

  According to the fifth embodiment, when the other track circuit that is the notification source of the break occurrence estimation signal is another track circuit that is not adjacent to the other track circuit of the side track or the track circuit of the same track, the rail break in the track circuit Is determined to have occurred. If the notification of the fracture occurrence estimation signal is received from the track circuit of the side track, the track circuit signal of the own track circuit flows into the track circuit of the side track via the electrically connected impedance bond. Therefore, it can be determined that the rail fracture of the track circuit has occurred. In addition, if the notification of the fracture occurrence estimation signal is received from another track circuit that is not adjacent to the track circuit on the same track, the track circuit signal of the track circuit flows through the circulating electrical path and flows into the track circuit. Therefore, it can be determined that a rail fracture of the track circuit has occurred.

As a seventh form,
The track circuit signal transmitted from the transmission unit through the rail is received by the reception unit, and the two track lines provided alongside the track circuit configured to detect the train based on the reception state of the signal, A rail breakage detection system for detecting the occurrence of a rail breakage in a circulating electric path formed by being electrically connected at two locations via an impedance bond,
Each track circuit in the reflux electrical path is
The transmitter transmits the track circuit identification information included in the track circuit signal,
From other signals received by the receiving unit, the other circuit signal extraction unit for extracting the track circuit signal of the other track circuit,
Based on the signal level of the track circuit signal extracted by the other circuit signal extraction unit of each track circuit, a control device (for example, FIG. 8) detects the occurrence of rail breakage in each track circuit in the circulating electrical path. It is also possible to constitute a rail breakage detection system provided with a centralized control device 100).

  According to the seventh aspect, the role of detecting the rail breakage of the track circuit can be assigned to the control device configured to detect the occurrence of the rail breakage of each track circuit in the circulating electrical path. .

1 is a schematic configuration diagram of a rail breakage detection system according to a first embodiment. Explanatory drawing of the principle of rail break detection. The figure which shows an example of the time change of a signal level. The block diagram which shows the structure of a track circuit. The figure which shows the data structural example of reflux electrical path information. The flowchart which shows the flow of the process which a process part performs. The flowchart which shows the flow of the process which a process part performs. The schematic block diagram of the rail fracture detection system in 2nd Embodiment.

  Hereinafter, an example of an embodiment suitable for the present invention will be described with reference to the drawings. However, embodiments to which the present invention is applicable are not limited to these.

1. 1. First embodiment 1-1. System Configuration FIG. 1 is a diagram showing a schematic configuration of a rail breakage detection system 1 in the first embodiment. Tracks A1, A2,... Are laid on the A line whose left direction is the traveling direction of the train, and track circuits B1, B2,.・ ・ Is laid.

  The track circuit is a device that detects the presence line by utilizing the fact that the two rails are electrically short-circuited by the train axle. In the present embodiment, the track circuit is a closed circuit type track circuit, and one block section is configured by a block device that combines one track circuit and one signal device. In FIG. 1, two adjacent block sections are configured by track circuits A1 and A2 of the A line, and two adjacent block sections are configured by track circuits B1 and B2 of the B line.

  Two sets of impedance bonds are installed between the rail insulations of the left and right rails at the track circuit boundary. The impedance bond is a device for allowing only a return current to flow to an adjacent track circuit while keeping track circuit boundaries electrically. In FIG. 1, in the A line, an impedance bond 923A is formed at the boundary between the track circuit A2 and the track circuit adjacent to the right side in the drawing, an impedance bond 912A is formed at the boundary between the track circuit A2 and the track circuit A1, and the track circuit A1. An impedance bond 901A is installed at the boundary with the track circuit adjacent on the left side in the drawing. Similarly, with respect to the B line, impedance bonds 901B, 912B, and 923B are sequentially installed from the track circuit B1 toward the direction B2.

  In the present embodiment, the two lines of the A line and the B line are electrically connected by the cross bonds 81 and 82 that connect the neutral points of the respective impedance bonds. The cross bond is a bond connected between the tracks of the side track for the purpose of reducing the return circuit resistance of the return current and eliminating the potential difference of the side track. When two or more cross bonds are provided, it is considered better to separate at least two track circuits. Therefore, in this embodiment, the arrangement interval of the cross bonds is a two-track circuit. In FIG. 1, the cross bond 81 connecting the impedance bond 901A of the A line and the impedance bond 901B of the B line, the impedance bond 923A of the A line, A cross bond 82 connecting the impedance bond 923B of the B line is formed. In the present embodiment, the configuration including the track circuits A1, A2, B1, and B2 and the cross bonds 81 and 82 is referred to as a rail breakage detection system 1.

  In the rail breakage detection system 1, an annular electric path composed of a track circuit A 1 → A 2 → cross bond 82 → track circuit B 2 → B 1 → cross bond 81 → track circuit A 1 (of course, the reverse direction may be used) is formed. This annular electric path is referred to as a “circular electric path” in the present embodiment. When a break occurs in one of the left and right rails of the track circuits A1, A2, B2, and B1, the track circuit signal flows through the circulating electrical path bypassing the other rail, and the signal level on the receiving side of the track circuit is If not sufficiently lowered, the track relay of the track circuit may or may not operate illegally. For this reason, it is necessary to reliably detect the occurrence of rail breakage of each track circuit in the circulating electrical path.

  In the present embodiment, each track circuit A1, A2, B1, B2 is connected to a track made of rail and a secondary coil of impedance bond provided at one end of the track, and the track 50 is connected to the track. A communication unit that communicates with other track circuits and a central information management device, a receiving unit 20 that receives a signal transmitted to the vehicle, a processing unit 30 that performs overall control of the track circuit and performs various processes related to rail breakage detection Unit 40, a transmitter 50 connected to a secondary coil of impedance bond provided at the other end of the track and transmitting a track circuit signal to the track, and a reception level of the track circuit signal received by the receiver 20 And a signal control relay unit 60 for controlling a traffic signal directed to a train entering the track circuit.

  In the present embodiment, for convenience of explanation, it is assumed that the track circuit control device 10 is configured by the receiving unit 20, the processing unit 30, the communication unit 40, the transmitting unit 50, and the signal control relay unit 60. Of course, each may be configured as a single device, or the receiving unit 20, the processing unit 30, and the communication unit 40 may be configured as an integrated device. In FIG. 1, control devices A1-10, A2-10, B1-10, and B2-10 are configured for the track circuits A1, A2, B1, and B2, respectively.

  In FIG. 1, the control device 10 is shown by a solid line box so as to have a one-to-one relationship with the corresponding track circuit in order to easily illustrate and explain the relationship with the track circuit. In this case, as shown by being surrounded by a one-dot chain line, a transmitting unit on one track circuit side adjacent via an impedance bond, a processing unit on the other track circuit side, a communication unit, a receiving unit, and a signal control relay Is installed in the vicinity of the impedance bond.

  In this embodiment, the transmission unit 50 of each track circuit rails track circuit signals modulated by a predetermined modulation method so as to carry track circuit ID (IDentification), which is an identification code uniquely assigned to each track circuit. Send to. As a modulation method, various methods can be applied. For example, MSK (Minimum Shift Keying) modulation which is a kind of digital modulation can be applied. The transmission unit 50 is configured to transmit an AC track circuit signal. Each track circuit is assigned a frequency of the track circuit signal, and the transmission unit 50 transmits the track circuit signal at the frequency assigned to the track circuit. In the present embodiment, any one of the three frequencies f1 to f3 is assigned to each track circuit.

  The frequency allocation of each track circuit is as follows. That is, different frequencies are assigned to adjacent track circuits on the same line. Further, in the circulating electrical path, the track circuits of different lines connected by cross bonds (track circuits A1 and B1, track circuits A2 and B2 in the example of FIG. 1) have different frequencies so that different frequencies are allocated. Determined. For example, in the circulating electrical path surrounded by the cross bonds 81 and 82 in FIG. 1, the track circuit A1 has the track circuit ID “A001” and the frequency “f1”, and the track circuit A2 has the track circuit ID “A002” and the frequency “ The track circuit ID “B001” and the frequency “f2” are allocated to the track circuit B1, and the track circuit ID “B002” and the frequency “f1” are allocated to the track circuit B2.

  The signal control relay unit 60 is a track relay that “goes up” or “falls” based on the reception level of the track circuit signal of the track circuit detected by the receiving unit 20 (hereinafter also simply referred to as “relay”). It is a circuit part provided with. The track relay is connected to the traffic light 2 directed to the train entering the track circuit. While the signal level of the received signal in the receiving unit 20 exceeds the predetermined drop determination signal level, the relay of the signal control relay unit 60 is raised. However, when the signal level of the signal of the own track circuit received by the receiving unit 20 is equal to or lower than the drop determination signal level, the relay of the signal control relay unit 60 is dropped, and the traffic signal connected to the relay is stopped. To be controlled.

  The traffic light 2 is installed at the entrance of the corresponding block section (track circuit), and displays a signal indicating whether the train is permitted to enter the block section. A traffic light A1-2 is connected to the track circuit A1, a signal A2-2 is connected to the track circuit A2, a signal B1-2 is connected to the track circuit B1, and a signal B2-2 is connected to the track circuit B2.

1-2. Principle FIG. 2 is an explanatory diagram of the principle of rail break detection in this embodiment. FIG. 2 shows a table that defines the correspondence between the relay state of the own track circuit and whether or not an abnormal estimation signal is received from another track circuit. With reference to this table, The principle of detection of rail breakage will be described. In the table of FIG. 2, the “urgent inspection” column indicates “necessary” for a case where an immediate inspection is required because an abnormality is determined in the present embodiment.

  Each track circuit detects a rail break in the circulating electrical path based on the received signal level of the receiving unit 20. Specifically, the receiving unit 20 extracts signals of frequencies f1 to f3 from the received signal, and detects the signal level of the extracted signal. The extraction of the signal of each frequency is realized by passing the received signal through a filter, for example.

  If the signal level of the received signal at a frequency other than the frequency of the own track circuit exceeds a predetermined allowable level, the signal of the other track circuit is flowing into the signal flowing through the track circuit, and It is estimated that the rail breakage of the other track circuit has occurred. Therefore, in this case, the other track circuit is specified by performing predetermined demodulation processing on the received signal. As described above, the transmission unit 40 of each track circuit transmits a track circuit signal including the track circuit ID uniquely assigned to each track circuit. Therefore, by performing a demodulation process on the received signal to obtain the track circuit ID, it is possible to specify a track circuit that may break the rail. Then, in order to notify the other track circuit of the possibility of rail breakage, an abnormality estimation signal is transmitted to the other track circuit.

  On the other hand, each track circuit includes a plurality of elements such as (A) presence / absence of reception of an abnormality estimation signal, (B) relative arrangement classification of a track circuit from which the received abnormality estimation signal is transmitted, and (C) a relay state of the own track circuit. Based on the above, the presence / absence of rail breakage of the track circuit is determined. And according to the determination result mentioned above, control of an own signal machine, the inspection request | requirement to a central information management apparatus, etc. are performed, and the safety | security of train operation is ensured.

  Here, the relative placement section of the track circuit indicates the relative layout relationship between the track circuit that has received the abnormality estimation signal and the track circuit that is the source of the abnormality estimation signal, and each track circuit is placed on the same line. In the case of being arranged, it is referred to as “same line”, and in the case of being arranged on a line to be provided side by side, it is referred to as “side line”. Of the track circuits of the same line, adjacent track circuits are referred to as “adjacent track circuits”, and track circuits that are not adjacent are referred to as “non-adjacent track circuits”.

(1) When an abnormality estimation signal is not received from another track circuit When an abnormality estimation signal is not received from another track circuit, there is a possibility that an abnormality such as rail breakage has occurred in the own track circuit. Since it is low, the following judgment is made based on the relay state of the track circuit. That is, if the rail is not broken or the own track circuit is not broken, the signal normally flows through the own track circuit, so the signal level of the track circuit signal of the own track circuit exceeds the predetermined fall judgment signal level. However, the relay of the signal control relay unit 60 is hoisted. Therefore, if the relay is hoisting, it is determined that there is no rail breakage. In this case, it can be diagnosed that the detection of rail breakage by the track circuit is functioning normally.

  On the other hand, when the signal level of the frequency signal of the track circuit is equal to or lower than the drop determination signal level, the relay of the signal control relay unit 60 is dropped. Therefore, when the relay is falling, it is determined that a train is on the track circuit, a rail break has occurred in the track circuit, or a failure has occurred in the track circuit.

  If the determination of (1) is made, a human (administrator, etc.) determines whether or not the own track circuit is inspected along with information on other systems, in the same way as the conventional measures for the circuit operation of the track circuit. Then, if necessary, inspect the track circuit.

(2) When an abnormal estimation signal is received from an adjacent track circuit on the same line When an abnormal estimation signal is received from an adjacent track circuit on the same line, the track circuit signal of the own track circuit flows into the adjacent track circuit it is conceivable that. In this case, the rail of the own track circuit is broken and a signal is flowing into the adjacent track circuit, or the rail insulation provided at the boundary between the track circuit and the adjacent track circuit is broken. It is possible that a bridge has occurred. Therefore, the following determination is made according to the relay state of the track circuit.

  If the relay is hoisting, whether or not the reception level has fallen above a certain level within a certain period of time after receiving an abnormal estimation signal from an adjacent track circuit, and then whether or not the signal level is in an unrecovered state Determine. Since the abnormal estimation signal is received from the adjacent boundary of the adjacent track circuit, it is possible that the rail of the track circuit is broken or an insulation bridge at the track circuit boundary has occurred. If the condition is satisfied, it can be estimated that the possibility that the rail of the track circuit is broken is higher than the occurrence of the insulation bridge. If the rail breaks and current does not flow (or it becomes difficult to flow), even if the detour exists and the relay does not drop, the reception level decreases to some extent and the state is maintained. This is because it is considered.

  Also, in this case, the train is allowed to enter the self-closed section because the relay is hoisting, but the rail is likely to break, so the train It is dangerous to allow entry. Therefore, in this case, control is performed so that the stop signal is displayed on the own signal device and the stop display is maintained.

  On the other hand, when the above-described conditions are not satisfied, it can be estimated that the possibility of the occurrence of the insulation bridge is higher than the occurrence of the rail fracture. This is because it is unlikely that rail breakage has occurred because the above-mentioned conditions are not satisfied, but because an abnormality estimation signal is received from an adjacent track circuit, there is a high suspicion of an insulation bridge. In this case, there is a possibility that the relay of the track circuit will fall illegally and cause a train delay in the future, so it is necessary to raise the relevant failure detection information to a command or the like and promote the investigation.

  On the other hand, when the relay is falling, it is possible that the train is in the self-closed section. However, since the possibility of breakage of the rail of the track circuit is estimated by the adjacent track circuit, it is determined that the break of the rail of the track circuit has occurred. In this case, since the traffic signal is stopped due to the relay being dropped, entry of the train into the self-closing section is suppressed.

  If the determination in (2) is made, it is dangerous to run the train as it is, which may lead to an accident, so it is appropriate to have the inspector immediately inspect the rails of the track circuit. Therefore, in this case, a request signal for inspecting the own track circuit is transmitted to the central information management device, and the inspector is urged to promptly inspect the own track circuit.

(3) When an abnormal estimation signal is received from the track circuit of the adjacent line or from the non-adjacent track circuit of the same line When an abnormal estimation signal is received from the track circuit of the adjacent line or from the non-adjacent track circuit of the same line, these tracks The signal of the own track circuit is flowing into the circuit, and there is a high possibility that the own track circuit is not operating normally. Specifically, the track circuit signal of the own track circuit flows into the track circuit of the side track because the track circuit signal of the track circuit flows through the circulating electrical path through the cross bond. It is possible that Therefore, in this case, it is determined that a rail break has occurred in the track circuit regardless of the state of the relay.

  When the relay is falling, the own signal is set to stop, so that the train is prevented from entering the self-closed section. On the other hand, when the relay is going up, the train is allowed to enter the self-closing section. However, since there is a high possibility that a rail break has occurred in the own track circuit, it is dangerous to allow the train to enter the self-closing section. Therefore, in this case, control is performed so that the stop signal is displayed on the own signal device.

  When the determination of (3) is made, as in the case of the determination of (2), an inspection request signal is transmitted to the central information management device in order to prompt the inspector to immediately inspect the own track circuit.

  Here, the principle of track circuit abnormality detection will be described with a specific example. FIG. 3 is a diagram illustrating an example of a temporal change in the reception level of the signal of the own track circuit. In FIG. 3, the horizontal axis represents time, and the vertical axis represents the reception level. The relay drop determination signal level is indicated by “θ”.

  While the train is not in the self-closed section, the signal level of the track circuit exceeds the drop determination signal level “θ”, and the relay is on the line. After that, when the train enters the self-closing section at time “t1”, the track level is short-circuited by the train's wheel shaft, the signal level is lowered, and the relay falls by dropping below the drop determination signal level “θ”. To do. When the train passes through the self-closing section at time “t2”, the signal level returns to the original level again, and the relay goes up. In this case, it can be determined that there is no rail breakage based on the determination of (1) described above.

  Thereafter, similarly, when the train enters the self-closing section at time “t3” and the train passes through the self-closing section at time “t4”, the period from time “t3” to “t4” Falls below the drop determination signal level “θ”, the relay drops, and after time “t4”, the relay rises. Also in this case, it is determined that the rail is not broken by the above-described determination (1).

  Thereafter, it is assumed that a rail breakage occurs in the track circuit at time “t5”. In this case, the signal level of the track circuit signal flowing through the track circuit decreases due to the rail breakage. If the signal level is lower than the drop determination signal level “θ”, the relay is dropped and the state is maintained. Therefore, it can be determined that the rail fracture has occurred by the above-described determination (1). However, depending on the degree of rail breakage, the signal level is not necessarily lower than the drop determination signal level “θ”. Although the signal level slightly decreases as shown in FIG. 3, the drop determination signal level “θ” Higher state may be maintained.

  In this case, the possibility of rail breakage of the own track circuit is estimated by the adjacent track circuit of the same line, and the adjacent track circuit transmits an abnormality occurrence estimation signal to the own track circuit. Then, if the own track circuit receives the abnormality estimation signal from the adjacent track circuit at time “t6”, there is a decrease in the signal level during the past certain time “Δt” going back from time “t6”. It is determined whether or not the signal level is in an unrecovered state. Referring to FIG. 3, since the signal level has decreased at time “t5” included in the past fixed time “Δt” and the signal level has not recovered until time “t6”, the determination in (2) described above is performed. Thus, it is determined that a rail break has occurred. By such determination, even if the signal level does not become lower than the drop determination signal level, it is possible to reliably detect the rail breakage of the own track circuit.

1-3. Functional Configuration FIG. 4 is a block diagram showing a functional configuration of the track circuit control device 10 included in the rail breakage detection system 1. The control device 10 includes a reception unit 20, a processing unit 30, a communication unit 40, a transmission unit 50, and a signal control relay unit 60.

  The receiving unit 20 is a receiving circuit that receives a signal flowing through the own track circuit. For example, the receiving unit 20 digitally filters a band-pass filter that filters a signal in the frequency f1 to f3 band from the received signal and a signal that has passed through the band-pass filter. And an A / D converter for converting the signal. In the present embodiment, the processing unit 30 is described as performing the process of demodulating the digital signal, but it is needless to say that the receiving unit 20 may include a demodulation unit that demodulates the digital signal. The receiving unit 20 includes a signal level determining unit that determines the signal level of the received signal, and outputs the signal level of the track circuit signal having the determined frequency of the own track circuit to the signal control relay unit 60.

  The processing unit 30 is a processing circuit that comprehensively controls the track circuit, and includes, for example, a processor such as a CPU (Central Processing Unit) or a DSP (Digital Signal Processor), and is shown in FIGS. 6 and 7 according to a control processing program. The control process to be executed is executed. The processing unit 30 also executes a process of demodulating the reception signal A / D converted by the receiving unit 20. The processing unit 30 includes a storage unit. In addition to the control processing program, for example, the circulating electrical path information 31, the relay state 33, the abnormality estimation signal reception information 35, and the own circuit signal level history information are stored in the storage unit. 37 is stored.

  FIG. 5 is a diagram illustrating a data configuration example of the reflux electrical path information 31. The circulating electrical path information 31 is information on each track circuit included in the rail breakage detection system 1, that is, each track circuit constituting the reflux electrical path, and the track circuit ID 311 and the frequency 313 assigned to the track circuit, The type 315 of the track on which the track circuit is provided and the own / other identification 317 of the track circuit are stored in association with each other. The self-other identification 317 stores “self” when the track circuit is a self-track circuit, and “other” when the track circuit is another track circuit.

  The relay state 33 is the current state of the track relay of the signal control relay unit 60, and stores either “rising up” or “falling”.

  The abnormality estimation signal reception information 35 is information related to the abnormality estimation signal received from another track circuit, and whether or not the error estimation signal is received and, when received, the track circuit ID of the track circuit that is the source of the error estimation signal. Is memorized.

  The own circuit signal level history information 37 is signal level history information in which the signal level of the own track circuit detected by the receiving unit 20 is recorded in time series. The processing unit 30 performs a process of recording the signal level of the own track circuit detected by the receiving unit 20 in the own circuit signal level history information 37 as needed.

  The communication unit 40 is a communication device that performs wired communication or wireless communication with an external device such as another track circuit or a central information management device under the control of the processing unit 30. This function is realized by, for example, a module for wired communication, a wireless communication module such as a wireless LAN by IEEE802.11 or wireless communication by a spread spectrum method, and the like.

  The transmission unit 50 uses the signal of the frequency 313 assigned to the own track circuit as a carrier wave, the track circuit signal obtained by modulating the track circuit ID 311 of the track circuit with a predetermined modulation method, and the track of the track circuit at a predetermined signal level. It is a transmission circuit which transmits to.

  The signal control relay unit 60 is a circuit unit including a track relay that operates according to a signal level detected by the track circuit signal receiving unit 20 that flows through the track circuit. The signal control relay unit 60 is connected to the own signal device.

1-4. Flow of Processing FIGS. 6 and 7 are flowcharts showing the flow of control processing performed by the processing unit 30 of the track circuit. First, the processing unit 30 determines whether the received signal level of a frequency other than the frequency of the own track circuit has exceeded a predetermined allowable level based on the signal level output from the receiving unit 20 (step A1). . If it is determined that it has exceeded (step A1; Yes), the received signal is demodulated (step A3), and the track circuit ID included in the received signal is acquired to identify the source track circuit. .

  Next, the processing unit 30 refers to the circulating electrical path information 31 of the storage unit, and determines whether or not the track circuit ID 311 of the track circuit that is the transmission source of the signal is known as a track circuit included in the rail breakage detection system 1. Determine (step A5). And when it determines with it being known (step A5; Yes), an abnormality estimation signal is transmitted to the said transmission origin circuit via the communication part 40 (step A7).

  If it is determined that the track circuit ID 311 of the transmission source circuit is unknown (step A5; No), it is determined that a signal is received from a track circuit outside the circulating electrical path that does not constitute the circulating electrical path, and processing is performed. The unit 30 determines that the track circuit test is “necessary” and performs a test request notification process of transmitting a track circuit test request to the central information management device via the communication unit 40 (step A9).

  After the process of step A7 or A9, or when it is determined in step A1 that the received signal level is equal to or lower than the allowable level (step A1; No), the processing unit 30 has received an abnormal estimation signal from another track circuit. (Step A11). And when it determines with having received (step A11; Yes), the abnormality estimation signal reception information 35 of a memory | storage part is updated (step A13).

  Thereafter, the processing unit 30 updates the relay state 33 of the storage unit based on the relay state of the signal control relay unit 60 (step A15). Then, the processing unit 30 refers to the abnormality estimation signal reception information 35 to determine whether or not the abnormality estimation signal is “received” (step A <b> 17). Step A17; No), it is determined whether or not the relay state 33 is a drop (step A19).

  When it determines with the relay state 33 being fall (step A19; Yes), the process part 30 performs a standing line determination (step A21). Specifically, the presence / absence of a standing line is determined based on the signal display of the track circuit.

  When it is determined that there is no standing line in step A21 (step A23; No), the processing unit 30 determines that a rail break has occurred in the own track circuit or that the own track circuit has failed, and communication is performed. An abnormality notification process for notifying the central information management apparatus of the abnormality is performed via the unit 40 (step A25). Then, the processing unit 30 maintains the display of the own signal device at the stop display (step A27) and waits as it is. That is, the state is maintained until the own track circuit is inspected and reset.

  Further, when it is determined in step A19 that the relay state 33 is not “dropped” but “upward” (step A19; No), or when it is determined that there is a standing line in step A23 (step A23; Yes), The processing unit 30 returns to Step A1.

  On the other hand, when it is determined in step A17 that the abnormality estimation signal is “received” (step A17; Yes), the processing unit 30 determines that the track circuit inspection is “necessary”, and the communication unit 40 performs central processing. An inspection request notification process for transmitting an inspection request signal to the information management apparatus is performed (step A29).

  Then, the processing unit 30 determines whether or not the relay state 33 is “falling” (step A31). If the processing unit 30 determines that the relay state 33 is “falling” (step A31; Yes), the rail breaks in the own track circuit. It is determined that has occurred, and an abnormality notification process for notifying the central information management device of the abnormality via the communication unit 40 is performed (step A33). Then, the processing unit 30 maintains the display of the own signal device at the stop display (step A35) and stands by as it is. That is, the state is maintained until the own track circuit is inspected and reset.

  In addition, when it is determined that the relay state 33 is not “falling” but “upboard” (step A31; No), the processing unit 30 determines that the source of the received abnormality estimation signal is the track circuit of the side line or the same line. It is determined whether or not it is a non-adjacent track circuit (step A37). And when it determines with it being a track circuit of a side track, or a non-adjacent track circuit of the same track (step A37; Yes), it controls so that the display of an own signal apparatus will be a stop display (step A39).

  And the process part 30 determines with the rail breakage having generate | occur | produced in the own track circuit, and performs the abnormality notification process which alert | reports abnormality to a central information management apparatus via the communication part 40 (step A41). Then, the processing unit 30 maintains the display of the own signal device at the stop display (step A43) and waits as it is. That is, the state is maintained until the own track circuit is inspected and reset.

  Further, when it is determined in step A37 that the source of the received abnormality estimation signal is not the track circuit of the side track or the non-adjacent track circuit of the same line, but the adjacent track circuit of the same line (step A37; No) The processing unit 30 determines whether or not a decrease in the reception level has occurred (step A45). And when it determines with having generate | occur | produced (step A45; Yes), it controls so that an own signal apparatus may be set as a stop display (step A47).

  Then, the processing unit 30 determines that there is a possibility of a rail break of the own track circuit, and performs an abnormality notification process for notifying the central information management device of the abnormality via the communication unit 40 (step A49). Then, the processing unit 30 maintains the stop indication of the own signal device (step A51) and stands by as it is. That is, the state is maintained until the own track circuit is inspected and reset.

  Further, when it is determined in step A45 that the reception level has not decreased (step A45; No), the processing unit 30 determines that an insulation bridge has occurred between the own track circuit and the adjacent track circuit. Then, abnormality notification processing for notifying the central information management apparatus of the abnormality via the communication unit 40 is performed (step A53). Then, the processing unit 30 returns to Step A1.

1-5. Effect In the rail breakage detection system 1, the track circuit is continuously provided along the track on each of the A line and the B line, and two impedance bonds are provided at the boundary portion of the track circuit by the cross bond. In this way, a reflux electric path is configured. In each track circuit in the circulating electrical path, the transmission unit 50 includes the track circuit ID, which is identification information of the track circuit, in the track circuit signal and transmits the track, and the reception unit 20 transmits the track circuit ID. The generated track circuit signal is received.

  The receiving unit 20 extracts, from the received signal, a signal having a frequency assigned to the own track circuit and a signal having a frequency assigned to another track circuit in the circulating electrical path. Then, the signal level of the extracted signal is detected and output to the processing unit 30. When the reception level of the signal of the frequency of the other track circuit output from the receiving unit 20 exceeds a predetermined allowable level, the processing unit 30 performs a demodulation process on the signal to obtain the track circuit ID. Then, another track circuit that may cause an abnormality in the rail is specified. Then, the processing unit 30 transmits an abnormality estimation signal to the identified other track circuit.

  On the other hand, the own track circuit is based on the presence / absence of an abnormal estimation signal from another track circuit, the relative placement classification of the track circuit from which the abnormal estimation signal is transmitted, and the status of the track relay of the own track circuit. Judge whether there is a rail break. Specifically, when an abnormality estimation signal is not received from another track circuit, the presence or absence of rail breakage is determined based on the relay state of the signal control relay unit 60 of the track circuit. That is, when the relay is hoisting, it is determined that there is no abnormality in the own track circuit, and when the relay is falling, it is determined that there is any one of standing line, rail breakage, or failure of the own track circuit.

  Further, when the track circuit that has received the abnormality estimation signal is an adjacent track circuit on the same line, if the relay of the track circuit is dropped, it is determined that the rail is broken. If the relay is hoisting, if the signal level of the track circuit signal of the track circuit has fallen within a certain period in the past and is not recovered, it is determined that there is a possibility of rail breakage, and the Control to display a stop signal. If the above-mentioned conditions are not detected, it is determined that there is a possibility of an insulation bridge between the own track circuit and the adjacent track circuit. In this case, in order to prevent the relay of the own track circuit from falling down and causing a train delay in the future, the central information management device is notified of the detection of the insulation bridge, and the inspector is encouraged to investigate. .

  In addition, when the track circuit that has received the abnormality estimation signal is a track circuit of the side track or a non-adjacent track circuit of the same track, it is determined that the rail is broken regardless of the relay state of the track circuit. And when the relay is hoisting, control the local signal to display the stop signal, and then control to maintain that state, and when the relay is falling, display the stop signal of the local signal. Control to maintain.

  In this way, by monitoring the signal level of the frequency signal of the other track circuit among the signals detected on the receiving side of the own track circuit, the rail level of the other track circuit is monitored. Can be estimated appropriately. When the possibility of breakage of the rail is estimated, the other track circuit having the possibility of breakage is specified by performing demodulation processing on the received signal and obtaining the track circuit ID. Then, by transmitting the abnormality estimation signal to the other track circuit, the other track circuit can be informed of the possibility of rail breakage.

  On the other hand, when an abnormality estimation signal is received from another track circuit, the track circuit can know that there is a possibility that an abnormality has occurred in the rail of the track circuit, and the frequency signal of the track circuit is detected. By examining the signal level in detail, it is possible to grasp whether or not the rail breakage of the track circuit has occurred. And when it is judged that the rail is broken and the relay of the own track circuit is not dropped, the stop signal is displayed on the own signal device to prevent the train from entering the self-closing section. By doing so, the principle of fail-safe can be observed. Further, in this case, by notifying the central information management device of the inspection request, it is possible to prompt the rail inspection by the inspector.

2. Second Embodiment FIG. 8 is a schematic configuration diagram of a rail breakage detection system 3 according to a second embodiment. In the rail break detection system 1 described in the first embodiment, each track circuit included in the circulating electrical path detects a rail break of each track circuit. In the rail break detection system 3 according to the second embodiment, the rail break detection system 3 is concentrated. The control device 100 detects an abnormality in each track circuit included in the circulating electrical path.

  The centralized control device 100 controls the centralized control device and each track circuit in an integrated manner, and performs processing for detecting occurrence of rail breakage in each track circuit, and other external devices such as a central information management device And a communication unit 120 for performing communication. Further, in the centralized control device 100, for each track circuit included in the circulating electrical path, a receiving unit 20, a transmitting unit 50, and a signal control relay unit 60 of the track circuit are installed.

  The processing unit 110 of the central control apparatus 100 performs signal processing on the signal input from the receiving unit 20 of each track circuit, extracts signals of frequencies f1 to f3, and detects the signal level of each frequency signal. And the process part 110 detects generation | occurrence | production of the rail fracture of each track circuit according to the principle demonstrated in 1st Embodiment. The receiving unit 20 of each track circuit may perform signal processing on the received signal, detect the signal level of each frequency signal, and output the signal level to the processing unit 110. A reception signal may be input from the reception unit 20 and signal processing may be performed to detect the signal level of each frequency signal.

  The signal control relay unit 60 of each track circuit is connected to the processing unit 110 in addition to the receiving unit 20. When the processing unit 110 detects a rail break in the track circuit, the processing unit 110 outputs a control signal to the signal control relay unit 60 of the track circuit, drops the relay, sets the signal as a stop indication, and maintains the stop indication. To control. That is, control is performed so as to maintain the state where the track relay is dropped. Then, the processing unit 110 prompts the inspector to inspect the track circuit by displaying the occurrence of rail breakage.

  Such a rail breakage detection system 3 is preferably applied to, for example, detection of rail breakage of a track circuit in a station premises. In the station premises, there are many departure and arrival number lines, and the lines are complicated, so the arrangement of the track circuit is also complicated, and a signal detour is easily formed. Therefore, when a rail break occurs in a station, a track circuit signal flows around the adjacent track circuit of the same track or a track circuit of a side track, and the signal level detected by the track circuit may not be sufficiently lowered. is there. Therefore, the centralized control device that performs centralized control of railway safety equipment such as track circuits, traffic lights, and switchboards installed in the station premises plays a role in detecting the rail breakage of each track circuit. It is preferable to perform the control on the safe side as the main body.

3. Other application examples 3-1. Application System In the above-described embodiment, an example of a system that detects the occurrence of rail breakage of a track circuit in the circulating electrical path by paying attention to the circulating electrical path formed by connecting two lines by a cross bond. And explained. However, in addition to this, the present invention can be applied as long as the circulating electrical path is formed by electrically connecting two lines through two impedance bonds.

  For example, in the section in the vicinity of the substation equipment, the above-described reflux electrical path may be formed. An example is a section near a DC substation where DC power is applied to the overhead line. The DC substation uses a transformer to step down an AC special high voltage or high voltage supplied from an electric power company, converts the DC into a rectifier, and applies DC power to the overhead line. At this time, DC power is applied to the overhead line with reference to the baseline voltage via the impedance bond as the ground side voltage. Since a plurality of impedance bonds provided on each side line are electrically connected, a circulating electrical path may be configured. By applying the present invention also to such a section, it is possible to prevent unauthorized operation of the track circuit and ensure the safety of train operation.

  In the above-described embodiment, detection of occurrence of rail breakage in the circulating electrical path in the case where the cross bond arrangement interval is a two-track circuit has been described as an example. The same applies to the detection of the occurrence of rail breakage in the circulating electrical path.

3-2. Extraction of Track Circuit ID In the above-described embodiment, the processing unit 30 performs the process of demodulating the track circuit signal in each track circuit. However, the receiving unit 20 includes a demodulation unit that demodulates the track circuit signal. The receiving unit 20 may extract a track circuit ID of another track circuit.

  In addition, it is possible to provide the transmission unit 50 with a reception function and a demodulation unit so that the transmission unit 50 extracts the track circuit ID. In this case, the transmitting unit 50 transmits the track circuit signal including the track circuit ID to the track of the track circuit, receives and demodulates the signal flowing through the track circuit, and extracts the track circuit ID of the other track circuit. To do. Thereby, a part of the function of the receiving unit 20 can be assigned to the transmitting unit 50.

  In addition, it is also possible to adopt a configuration in which the track circuit ID is extracted from a signal detected by another part in the circulating electrical path instead of the signal received by the receiver 20 at the secondary coil part of the impedance bond. . For example, a sensor (for example, a current sensor) for detecting a track circuit signal is connected to a neutral point or a cross bond of an impedance bond. Then, the signal detected by the sensor is demodulated to extract the track circuit ID of the other track circuit.

DESCRIPTION OF SYMBOLS 1, 3 Rail breakage detection system 2 Traffic light 10 Track circuit control apparatus 20 Receiving part 30 Processing part 40 Communication part 50 Transmitting part 60 Signal control relay part A, B Track A1, A2, B1, B2 Track circuit

Claims (7)

The track circuit signal transmitted from the transmission unit through the rail is received by the reception unit, and two track lines provided alongside the track circuit configured to detect the train based on the reception state of the signal, A rail breakage detection method for detecting the occurrence of rail breakage in a circulating electric path formed by being electrically connected at two locations via an impedance bond,
Each track circuit in the reflux electrical path is
The transmitter transmits the track circuit identification information included in the track circuit signal,
Other circuit signal extraction step for extracting the track circuit signal of the other track circuit from the signals received by the receiving unit;
An estimation step for estimating the possibility of breakage of the rail of the other track circuit based on the signal level of the track circuit signal of the extracted other track circuit;
A specific step of identifying the other track circuit based on the identification information included in the track circuit signal of the extracted other track circuit;
When it is estimated that there is a possibility of rupture in the estimation step, a notification step of notifying the rupture occurrence estimation signal to the other track circuit identified in the identification step;
A notification acquisition step for acquiring that the fracture occurrence estimation signal has been notified from the other track circuit toward the track circuit;
Break determination step for determining occurrence of a rail break in the track circuit using the acquisition result of the notification acquisition step;
Run
A rail breakage detection method for detecting occurrence of a rail breakage in each track circuit in the reflux electric path. Each track circuit in the reflux electrical path is
A control relay unit for controlling the traffic signal of the track circuit based on the reception state of the track circuit signal of the track circuit;
When it is determined in the break determination step that rail breakage has occurred, whether or not the rail breakage detection by the track circuit is functioning normally is diagnosed based on the control state of the traffic light by the control relay unit. Perform further diagnostic steps,
The rail fracture detection method according to claim 1. Each track circuit in the reflux electrical path is
If it is determined in the break determination step that a rail break has occurred, and the control relay unit does not control the traffic light to stop display, a current control step for controlling the traffic signal to stop display is further executed. To
The rail fracture detection method according to claim 2. Each track circuit in the reflux electrical path is
The own circuit signal extraction step for extracting the track circuit signal of the track circuit from the signals received by the receiving unit;
A storage step for historically storing the signal level of the track circuit signal extracted in the own circuit signal extraction step;
A sudden drop detecting step of continuously detecting that the signal level stored in the storing step is in an unrecovered state after a change that satisfies a predetermined sudden drop condition;
And execute
In the rupture determination step, when the other track circuit that is the notification source of the rupture occurrence estimation signal detected in the notification detection step is another track circuit adjacent to the track circuit on the same line, the sudden drop detection step is detected. Sometimes it is determined that there is a rail break in the track circuit, and when there is no detection, it is determined that there is an insulation bridge.
The rail fracture detection method according to any one of claims 1 to 3. In the rupture determination step, when the other track circuit that is the notification source of the rupture occurrence estimation signal detected in the notification detection step is another track circuit that is not adjacent to the other track circuit of the side track or the track circuit of the same track, the track It is determined that rail breakage has occurred in the circuit.
The rail fracture detection method according to any one of claims 1 to 4. The track circuit signal transmitted from the transmission unit through the rail is received by the reception unit, and the two track lines provided alongside the track circuit configured to detect the train based on the reception state of the signal, A rail breakage detection system for detecting the occurrence of a rail breakage in a circulating electric path formed by being electrically connected at two locations via an impedance bond,
Each track circuit in the reflux electrical path is
The transmitter transmits the track circuit identification information included in the track circuit signal,
Other circuit signal extraction unit for extracting the track circuit signal of the other track circuit from the signals received by the receiving unit,
Based on the signal level of the track circuit signal of the extracted other track circuit, an estimation unit that estimates the possibility of breakage of the rail of the other track circuit;
A specifying unit for specifying the other track circuit based on the identification information included in the track circuit signal of the extracted other track circuit;
When the estimation unit estimates that there is a possibility of breakage, a notification unit for notifying the other track circuit identified by the identification unit of a fracture occurrence estimation signal;
A notification acquisition unit for acquiring that the fracture occurrence estimation signal has been notified from another track circuit toward the track circuit;
A break determination unit that determines the occurrence of a rail break in the track circuit using the acquisition result of the notification acquisition unit;
Have
A rail breakage detection system for detecting the occurrence of rail breakage in each track circuit in the circulating electric path in each track circuit. The track circuit signal transmitted from the transmission unit through the rail is received by the reception unit, and two track lines provided alongside the track circuit configured to detect the train based on the reception state of the signal, A rail breakage detection system for detecting the occurrence of a rail breakage in a circulating electric path formed by being electrically connected at two locations via an impedance bond,
Each track circuit in the reflux electrical path is
The transmitter transmits the track circuit identification information included in the track circuit signal,
From other signals received by the receiving unit, the other circuit signal extraction unit for extracting the track circuit signal of the other track circuit,
Rail breakage provided with a controller for detecting occurrence of rail breakage in each track circuit in the circulating electrical path based on the signal level of the track circuit signal extracted by the other circuit signal extraction unit of each track circuit Detection system.

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