JP7005301B2 - Single point of failure identification system - Google Patents

Description

Embodiments of the present invention relate to a single point of failure determination system.

Rail electrification systems are considered to be the most effective solution to the increase in traffic. Railroad electrification systems such as trams and subways that apply the DC feeder system are solutions to the increase in traffic volume for transportation in urban areas. With the increasing demand for such railway electrification systems, the provision of safe and reliable services in railway electrification systems has become a high priority. In a railway electrification system, a failure such as a short circuit failure or a ground failure of an overhead line to which power is supplied from a substation may have a great influence on the safe operation of the railway electrification system.

Patent No. 3293759

However, overhead wire failures may be unavoidable even if the performance of the railway electrification system is improved or maintained. Therefore, rapid failure detection and resolution by improving the system that protects overhead lines from failures and the system that detects failures is expected as a means to avoid railway delays and passenger safety problems due to the occurrence of failures. Has been done.

The failure point determination system of the embodiment includes a first circuit breaker, a first device, a first voltage detection unit, a first current detection unit, a second circuit breaker, a second device, and a second voltage detection unit. And a first calculation unit. The first circuit breaker turns on or off the supply of DC power from the first substation to the overhead line in a predetermined section of the train. The first device is a first resistor that drops the voltage of the DC power supplied from the first substation to the overhead wire, and a first resistor that turns on or off the supply of the DC power whose voltage is dropped by the first resistance to the overhead wire. It has a switch and is connected in parallel to the first circuit breaker. The first voltage detection unit detects the first voltage of the DC power supplied from the first substation to the overhead line. The first current detection unit detects the first current value of the current flowing from the first substation to the overhead line. The second circuit breaker turns on or off the supply of DC power from the second substation, which is different from the first substation, to the overhead line. The second device turns on or off a second resistor that drops the voltage of the DC power supplied from the second substation to the overhead wire, and a second resistor that drops the voltage of the DC power by the second resistance to the overhead wire. It has a switch and is connected in parallel to the second circuit breaker. The second voltage detection unit detects the second voltage of the DC power supplied from the second substation to the overhead line. The first calculation unit includes the first voltage, the first current value, and the second voltage when the first circuit breaker and the second circuit breaker are turned off, the first switch is turned on, and the second switch is turned off. The length from the first substation to the failure point of the overhead wire is calculated based on the resistance value per predetermined length of the overhead wire.

FIG. 1 is a diagram showing an example of a configuration of a railway electrification system according to the present embodiment. FIG. 2 is a diagram for explaining a process of finding a failure point of an overhead wire in a railway electrification system according to the present embodiment. FIG. 3 is a flowchart showing an example of a flow of processing for obtaining a distance from a substation to a failure point in the railway electrification system according to the present embodiment. FIG. 4 is a flowchart showing an example of the flow of processing for obtaining the distance from the substation to the failure point in the railway electrification system according to the present embodiment. FIG. 5 is a flowchart showing an example of a flow of processing for detecting a failure point in a substation of a railway electrification system according to the present embodiment. FIG. 6 is a diagram for explaining an example of a process of detecting a failure point in a switchgear of a substation of a railway electrification system according to the present embodiment. FIG. 7 is a flowchart showing an example of a flow of processing for detecting a failure point in a substation of a railway electrification system according to the present embodiment. FIG. 8 is a diagram for explaining an example of a process of detecting a failure point in a switchgear of a substation of a railway electrification system according to the present embodiment. FIG. 9 is a diagram for explaining an example of a process of detecting a failure point in the control panel of the railway electrification system according to the present embodiment. FIG. 10 is a diagram for explaining an example of a process of detecting a failure point in the control panel of the railway electrification system according to the present embodiment. FIG. 11 is a diagram for explaining an example of a process of detecting a failure point in SCADA of the railway electrification system according to the present embodiment.

Hereinafter, the railway electrification system to which the failure point determination system according to the present embodiment is applied will be described with reference to the attached drawings.

FIG. 1 is a diagram showing an example of a configuration of a railway electrification system according to the present embodiment. As shown in FIG. 1, the railway electrification system according to the present embodiment is a system that employs a DC feeder system that supplies DC power to the overhead wire L of the train T. In a railway electrification system that employs a DC feeder system, DC power is supplied to the overhead line L from a plurality of power plants (in this embodiment, power plants TSS-A and TSS-B). In the following description, when it is not necessary to distinguish between power plant TSS-A and TSS-B, it is described as power plant TSS.

The substation TSS has a disconnector 16 that cuts off the current returned from the train T to the substation TSS via the rail R. The power plant TSS-A has a first power supply unit 10A and a second power supply unit 20A. The first power supply unit 10A and the second power supply unit 20A supply DC power to overhead lines L in sections different from each other. The substation TSS-B has a first power supply unit 10B and a second power supply unit 20B. The first power supply unit 10B and the second power supply unit 20B supply DC power to overhead lines L in sections different from each other.

Specifically, the first power supply unit 10A of the power plant TSS-A supplies DC power to the overhead wire L in the section S1. The second power supply unit 20A of the power plant TSS-A supplies DC power to the overhead line L of the section S2 adjacent to the section S1. The first power supply unit 10B of the power plant TSS-B supplies DC power to the overhead wire L in the section S2. Further, the second power supply unit 20B of the power plant TSS-B supplies DC power to the overhead line L of the section S3 adjacent to the section S2. In the railway electrification system of the present embodiment, DC power is supplied from a plurality of power plant TSS to the overhead wire L of each section in which the train T travels.

In the present embodiment, the first power supply units 10A and 10B and the second power supply units 20A and 20B supply DC power to the overhead line L (overhead line L for the up train and the overhead line L for the down train) in the section of the double track. Supply. Further, in the present embodiment, the railway electrification system is provided with an air section 30 for preventing current from flowing from the overhead wire L in one section to the overhead wire L in the other section adjacent to the one section. ..

Next, the configuration of the first power supply unit 10A of the power plant TSS-A will be described. As shown in FIG. 1, the first power supply unit 10A of the substation TSS-A includes a transformer 11, a rectifier 12, a power receiving side circuit breaker 13, a power transmission side circuit breaker 14A1, 14A2, a line test device 15A1, 15A2, and an instrument. It has current transformers 17A1 and 17A2, and voltage transformers 18A1 and 18A2.

The transformer 11 receives AC power supplied from a general power grid and steps down the received AC power. The rectifier 12 returns the current from the train T to the substation TSS-A via the rail R. Further, the rectifier 12 converts the AC power supplied from the general power grid (in this embodiment, the AC power stepped down by the transformer 11) into the DC power via the power receiving side circuit breaker 13. It is supplied to the overhead wire L in the section S1. The power receiving side circuit breaker 13 is composed of a DC high speed circuit breaker (HSCB: High Speed vacuum Circuit Breaker) or the like, and turns on or off the supply of AC power from a general power grid to the overhead line L.

The power transmission side circuit breaker 14A1 is composed of a DC high-speed circuit breaker (HSCB) or the like, and supplies DC power from the substation TSS-A to the overhead line L for the upstream train in the section S1 on (closed state) or off. (Open state). Specifically, the power transmission side circuit breaker 14A1 is turned off when the current flowing through the overhead line L becomes large due to a failure such as a short circuit failure or a grounding failure of the overhead line L for the upstream train in the section S1. The supply of DC power to L is cut off. The power transmission side circuit breaker 14A2 is composed of a DC high-speed circuit breaker (HSCB) or the like, and turns on or off the supply of DC power from the substation TSS-A to the overhead line L for the down train in the section S1. Specifically, the power transmission side circuit breaker 14A2 is turned off when the current flowing through the overhead line L becomes large due to a failure of the overhead line L for the down train in the section S1 or the like, and the DC power is supplied to the overhead line L. To shut off.

When the line test device 15A1 turns on the power transmission side circuit breaker 14A1 and starts supplying DC power to the overhead line L, the power transmission side circuit breaker is in a state where the overhead line L is overloaded or a failure occurs in the overhead line L. It is used to prevent 14A1 from turning on. Further, when the line test device 15A2 turns on the power transmission side circuit breaker 14A2 and starts supplying DC power to the overhead line L, the power transmission side is in a state where the overhead line L is overloaded or a failure occurs in the overhead line L. It is used to prevent the circuit breaker 14A2 from turning on. As a result, it is possible to prevent the power transmission side circuit breakers 14A1 and 14A2 from being damaged due to repeated flow of the cutoff current through the power transmission side circuit breakers 14A1 and 14A2.

The instrument transformer 17A1 is a current detection unit that detects the current value of the current flowing from the first power supply unit 10A to the overhead wire L for the upstream train in the section S1. The instrument transformer 17A2 is a current detection unit that detects the current value of the current flowing from the first power supply unit 10A to the overhead line L for the down train in the section S1. The voltage transformer 18A1 is a voltage detection unit that detects the voltage of the DC power supplied to the overhead wire L for the up train in the section S1. The voltage transformer 18A2 is a voltage detection unit that detects the voltage of the DC power supplied to the overhead wire L for the down train in the section S1.

Next, the configuration of the second power supply unit 20A of the power plant TSS-A will be described. In the following description, a configuration different from that of the first power supply unit 10A will be described. As shown in FIG. 1, the first power supply unit 10B of the substation TSS-B includes a transformer 11, a rectifier 12, a power receiving side circuit breaker 13, a power transmission side circuit breaker 14A3, 14A4, a line test device 15A3, 15A4, and an instrument. It has current transformers 17A3 and 17A4, and voltage transformers 18A3 and 18A4.

The rectifier 12 of the second power supply unit 20A converts the AC power supplied from the general power grid into DC power via the power receiving side circuit breaker 13 and supplies it to the overhead line L in the section S2.

The power transmission side circuit breaker 14A3 is composed of a DC high-speed circuit breaker (HSCB) or the like, and turns on or off the supply of DC power from the substation TSS-A to the overhead line L for the upstream train in the section S2. Specifically, the power transmission side circuit breaker 14A3 is turned off when the current flowing through the overhead line L becomes large due to a failure of the overhead line L for the upstream train in the section S2, and the DC power is supplied to the overhead line L. Cut off. The power transmission side circuit breaker 14A4 is composed of a DC high-speed circuit breaker (HSCB) or the like, and turns on or off the DC power from the substation TSS-A to the overhead line L for the down train in the section S2. Specifically, the power transmission side circuit breaker 14A4 is turned off when the current flowing through the overhead line L becomes large due to a failure of the overhead line L for the down train in the section S2, and the DC power is supplied to the overhead line L. To shut off.

When the line test device 15A3 turns on the power transmission side circuit breaker 14A3 and starts supplying DC power to the overhead line L, the power transmission side circuit breaker is in a state where the overhead line L is overloaded or a failure occurs in the overhead line L. It is used to prevent 14A3 from turning on. Further, when the line test device 15A4 turns on the power transmission side circuit breaker 14A3 and starts supplying DC power to the overhead line L, the power transmission side is in a state where the overhead line L is overloaded or a failure occurs in the overhead line L. It is used to prevent the circuit breaker 14A4 from turning on. As a result, it is possible to prevent the power transmission side circuit breakers 14A3 and 14A4 from being damaged due to repeated flow of the cutoff current through the power transmission side circuit breakers 14A3 and 14A4.

The instrument transformer 17A3 is a current detection unit that detects the current value of the current flowing from the second power supply unit 20A to the overhead wire L for the upstream train in the section S2. The instrument transformer 17A4 is a current detection unit that detects the current value of the current flowing from the second power supply unit 20A to the overhead line L for the down train in the section S2. The voltage transformer 18A3 is a voltage detection unit that detects the voltage of the DC power supplied to the overhead wire L for the up train in the section S2. The voltage transformer 18A4 is a voltage detection unit that detects the voltage of the DC power supplied to the overhead wire L for the down train in the section S2.

Next, the configuration of the first power supply unit 10B of the power plant TSS-B will be described. In the following description, a configuration different from that of the first power supply unit 10A will be described. As shown in FIG. 1, the first power supply unit 10B of the substation TSS-B includes a transformer 11, a rectifier 12, a power receiving side circuit breaker 13, a power transmission side circuit breaker 14B1, 14B2, a line test device 15B1, 15B2, and an instrument. It has current transformers 17B1 and 17B2, and voltage transformers 18B1 and 18B2.

The rectifier 12 of the first power supply unit 10B returns the current from the train T to the substation TSS-B via the rail R. Further, the rectifier 12 converts the AC power supplied from the general power grid into DC power via the power receiving side circuit breaker 13 and supplies the AC power to the overhead line L in the section S2.

The power transmission side circuit breaker 14B1 is composed of a DC high-speed circuit breaker (HSCB) or the like, and turns on or off the supply of DC power from the substation TSS-B to the overhead line L for the upstream train in the section S2. Specifically, the power transmission side circuit breaker 14B1 is turned off when the current flowing through the overhead line L becomes large due to a failure of the overhead line L for the upstream train in the section S2, and the DC power is supplied to the overhead line L. Cut off. The power transmission side circuit breaker 14B2 is composed of a DC high-speed circuit breaker (HSCB) or the like, and turns on or off the supply of DC power from the substation TSS-B to the overhead line L for the down train in the section S2. Specifically, the power transmission side circuit breaker 14B2 is turned off when the current flowing through the overhead line L becomes large due to a failure of the overhead line L for the down train in the section S2, and the DC power is supplied to the overhead line L. To shut off.

When the line test device 15B1 turns on the power transmission side circuit breaker 14B1 and starts supplying DC power to the overhead line L, the power transmission side circuit breaker is in a state where the overhead line L is overloaded or a failure occurs in the overhead line L. It is used to prevent 14B1 from turning on. Further, when the line test device 15B2 turns on the power transmission side circuit breaker 14B2 and starts supplying DC power to the overhead line L, the power transmission side is in a state where the overhead line L is overloaded or a failure occurs in the overhead line L. It is used to prevent the circuit breaker 14B2 from turning on. As a result, it is possible to prevent the power transmission side circuit breakers 14B1 and 14B2 from being damaged due to repeated flow of the cutoff current through the power transmission side circuit breakers 14B1 and 14B2.

The instrument transformer 17B1 is a current detection unit that detects the current value of the current flowing from the first power supply unit 10B to the overhead wire L for the upstream train in the section S2. The instrument transformer 17B2 is a current detection unit that detects the current value of the current flowing from the first power supply unit 10B to the overhead line L for the down train in the section S2. The voltage transformer 18B1 is a voltage detection unit that detects the voltage of the DC power supplied to the overhead wire L for the up train in the section S2. The voltage transformer 18B2 is a voltage detection unit that detects the voltage of the DC power supplied to the overhead wire L for the down train in the section S2.

Next, the configuration of the second power supply unit 20B of the power plant TSS-B will be described. In the following description, a configuration different from that of the first power supply unit 10B will be described. As shown in FIG. 1, the second power supply unit 20B of the substation TSS-B includes a transformer 11, a rectifier 12, a power receiving side circuit breaker 13, a power transmission side circuit breaker 14B3, 14B4, a line test device 15B3, 15B4, and an instrument. It has current transformers 17B3 and 17B4, and voltage transformers 18B3 and 18B4.

The rectifier 12 of the second power supply unit 20B converts the AC power supplied from the general power grid into DC power via the power receiving side circuit breaker 13 and supplies it to the overhead line L in the section S3.

The power transmission side circuit breaker 14B3 is composed of a DC high-speed circuit breaker (HSCB) or the like, and turns on or off the supply of DC power from the substation TSS-B to the overhead line L for the upstream train in the section S3. Specifically, the power transmission side circuit breaker 14B3 is turned off when the current flowing through the overhead line L becomes large due to a failure of the overhead line L for the upstream train in the section S3, and the DC power is supplied to the overhead line L. Cut off. The power transmission side circuit breaker 14B4 is composed of a DC high-speed circuit breaker (HSCB) or the like, and turns on or off the supply of DC power from the substation TSS-B to the overhead line L for the down train in the section S3. Specifically, the power transmission side circuit breaker 14B4 is turned off when the current flowing through the overhead line L becomes large due to a failure of the overhead line L for the down train in the section S3, and the DC power is supplied to the overhead line L. To shut off.

When the line test device 15B3 turns on the power transmission side circuit breaker 14B3 and starts supplying DC power to the overhead line L, the power transmission side circuit breaker is in a state where the overhead line L is overloaded or a failure occurs in the overhead line L. It is used to prevent 14B3 from turning on. Further, when the line test device 15B4 turns on the power transmission side circuit breaker 14B3 and starts supplying DC power to the overhead line L, the power transmission side is in a state where the overhead line L is overloaded or a failure occurs in the overhead line L. It is used to prevent the circuit breaker 14B3 from turning on. As a result, it is possible to prevent the power transmission side circuit breakers 14B3 and 14B4 from being damaged due to repeated flow of the cutoff current through the power transmission side circuit breakers 14B3 and 14B4.

The instrument transformer 17B3 is a current detection unit that detects the current value of the current flowing from the second power supply unit 20B to the overhead wire L for the upstream train in the section S3. The instrument transformer 17B4 is a current detection unit that detects the current value of the current flowing from the second power supply unit 20B to the overhead line L for the down train in the section S3. The voltage transformer 18B3 is a voltage detection unit that detects the voltage of the DC power supplied to the overhead wire L for the up train in the section S3. The voltage transformer 18B4 is a voltage detection unit that detects the voltage of the DC power supplied to the overhead wire L for the down train in the section S3.

Next, when a failure occurs in the overhead line L for the down train in the section S2, the process of cutting off the supply of DC power from the second power supply unit 20A of the substation TSS-A to the overhead line L in the section S2 will be described. .. Here, the process of cutting off the supply of DC power to the overhead line L by the second power supply unit 20A of the substation TSS-A will be described, but other power supply units (first power supply unit 10A, first power supply unit) will be described. Similarly, in 10B, the second power supply unit 20B), the cutoff process of the supply of DC power to the overhead wire L is executed.

As shown in FIG. 1, the second power supply unit 20A (for example, an opening / closing device for controlling the power transmission side circuit breaker 14A4) is used when a short-circuit failure occurs in the overhead wire L for the down train in the section S2 (for example, for an instrument). (When a current value higher than the normal current value is detected by the current transformer 17A4), a cutoff instruction instructing the cutoff of the DC current supply is transmitted to the power transmission side circuit breaker 14A4. Here, the normal current value is a current value that flows through the overhead wire L when no failure has occurred in the overhead wire L. When the power transmission side circuit breaker 14A4 receives the cutoff instruction, it turns off and cuts off the supply of DC power to the overhead line L in the section where the short circuit failure has occurred.

Next, a specific configuration of the line test device 15A4 will be described. Here, the configuration of the line test device 15A4 will be described, but other line test devices 15A1, 15A2, 15A3, 15B1, 15B2, 15B3, 15B4 also have the same configuration.

The line test device 15A4 is connected in parallel to the power transmission side circuit breaker 14A4. Further, the line test device 15A4 drops the voltage by the resistance LT (hereinafter referred to as voltage drop resistance) that drops the voltage of the DC power supplied from the second power supply unit 20A to the overhead wire L and the voltage drop resistance LT. It has a switch (contactor) SW for turning on or off the supply of the DC power to the overhead wire L, and a fuse F for blowing when a large current flows from the second power supply unit 20A to the overhead wire L.

When the power transmission side circuit breaker 14A4 is off, the line test device 15A4 turns on the switch SW and supplies DC power to the overhead line L. In this case, since the line test device 15A4 causes a current to flow through the overhead wire L via the voltage drop resistance LT, the current value of the current flowing through the overhead wire L is reduced. Since a resistance having a large resistance value is generally used for the voltage drop resistance LT, the current flowing through the train T to which the DC power is supplied from the overhead wire L becomes small.

By the way, conventionally, a method of defining a failure point of an electric power system (hereinafter referred to as a failure point determination method) has already been developed and is industrially used. For example, the failure point locating method for locating a failure point of a power system based on the impedance of an overhead wire is the most established method in industry in that it can be easily applied. This fault point determination method uses the current value and voltage detected while a fault occurs in the power system in order to determine the fault point of the power system. However, it is difficult to apply this failure point determination method to a railway electrification system using a DC feeder system for the following reasons.

First, a very large short-circuit current flows through the railway electrification system using the DC feeder system, and the protection device of the railway electrification system immediately prevents the generation of the short-circuit current. Therefore, it may be difficult for the voltage detector and the current detector of the railway electrification system to detect the voltage and the current value of the power system when a failure occurs.

Further, in the above-mentioned failure point determination method, a device for detecting the resistance value of the failure point must be provided at the failure point, but in a railway electrification system using a DC feeder system, the resistance value of the failure point is provided. Is difficult to detect. In the above-mentioned failure point determination method, it is not necessary to consider the resistance value of the failure point in the calculation for determining the failure point, but in this method, only one substation supplies power to the overhead line. However, it can be realized only in a railway electrification system in which the load of the train T is removed.

Further, in a railway electrification system using a DC electrification method, the current value of the short-circuit current detected by the current detector provided for each substation is exponentially the actual short-circuit current with the passage of time. It rises to the current value. Theoretically, the failure point of the overhead wire can be detected by comparing the current values of the short-circuit currents detected at each substation. However, when a failure occurs in the overhead wire, the circuit breaker is immediately turned off, which hinders the detection of the current value of the short-circuit current by the current detector. In addition, the breaking current that flows when the circuit breaker is turned off may interfere with the detection of the failure point of the overhead wire. Further, it is necessary to turn off the circuit breakers of the substations that supply DC power to the overhead lines in the section where the failure has occurred at the same time, but in reality, the timing of turning off the circuit breakers of each substation is different. For the above reasons, it is difficult to detect a single point of failure in a railway electrification system to which a DC feeder system is applied by a conventional single point of failure determination method.

Therefore, in the railway electrification system according to the present embodiment, when a failure occurs in the overhead line L for the down train in the section S2, the line test devices 15A4 and 15B2 are used to measure the short-circuit current and the resistance at the failure point of the overhead line L. Without considering the result, the failure point of the overhead line L for the down train in the section S2 is detected based on the impedance of the overhead line L.

Specifically, the railway electrification system turns off the transmission side circuit breakers 14A4 and 14B2, turns on the switch SW of the line test device 15A4, and turns on the line when detecting the failure point of the overhead line L for the down train in the section S2. The voltage detected by the instrument transformers 18A4 and 18B2 and the current value detected by the instrument current transformer 17A4 when the switch SW of the test device 14B2 is turned off, and the resistance value per predetermined length of the overhead wire L. Based on the above, the distance from the substation TSS-A to the failure point of the overhead line L for the down train in the section S2 is calculated. As a result, when a failure occurs in the overhead line L, the process of turning the power transmission side circuit breakers 14A4 and 14B2 from off to on is repeated, and no other device for defining the failure point of the overhead line L is provided. , The failure point of the overhead wire L can be obtained.

FIG. 2 is a diagram for explaining a process of finding a failure point of an overhead wire in a railway electrification system according to the present embodiment. Here, the process of finding the failure point of the overhead wire L for the down train in the section S2 will be described, but the failure point of the overhead wire L in the other section can also be obtained in the same manner. In FIG. 2, _RLTA is the resistance value (Ω) of the voltage drop resistor LT included in the line test device 15A4. R _f is a resistance value (Ω) at the failure point of the overhead wire L. V _f is the voltage (V) at the failure point of the overhead wire L. _VA is a voltage (in other words, a voltage detected by the voltage transformer 18A4) between the position A and the position A'shown in FIG. V _B is the voltage between the position B and the position B'shown in FIG. 2 (in other words, the voltage detected by the voltage transformer 18B2).

_Ia is the current value of the current flowing from the substation TSS-A to the failure point of the overhead line L for the down train in the section S2 (in other words, the current value detected by the instrument transformer 17A4). _Ib is the current value of the current flowing from the substation TSS-B to the failure point of the overhead line L for the down train in the section S2 (in other words, the current value detected by the instrument transformer 17B2). D ₁ is the distance from the substation TSS-A to the failure point of the overhead line L in the section S2. D ₂ is the distance from the substation TSS-B to the failure point of the overhead line L in the section S2. r is a resistance value (Ω / km) per predetermined length (1 km in this embodiment) of the overhead wire L.

According to Kirchhoff's law, the second power supply unit 20A and the first power supply unit 10B can obtain the voltage _VA and the voltage V _B as shown in the following equations (1) and (2).
V _A = I _a (D ₁ x r) + V _f ... (1)
V _B = I _b (D ₂ x r) + V _f ... (2)

Then, when the current transformers 17A4 and 18B2 for the instrument detect current values I _a and I _b higher than the predetermined current values and determine that a failure of the overhead wire L has occurred, the railway electrification system uses the substation TSS-A. The switch SW of the line test device 15A4 of the substation TSS-B is turned on, and the switch SW of the line test device 15B2 of the substation TSS-B is turned off. As a result, the voltage _VA and the distance D ₁ are expressed by the following equation (3).
V _A = I _a (D ₁ x r) + V _B
D ₁ = ( _VA -V _B ) / (I _a x r) ... (3)

Here, the resistance value r per predetermined length of the overhead wire L is obtained in advance, and the voltages _VA , _BB and the current value _Ia are the instrument transformer 17A4 and the instrument transformer 18A4. It can be detected by 18B2. Therefore, according to the above equation (3), the second power supply unit 20A extends from the substation TSS-A to the failure point of the overhead line L in the section S2 without detecting the short-circuit current at the failure point of the overhead line L. The distance D ₁ can be obtained. Further, the first power supply unit 10B can also obtain the distance from the substation TSS-B to the failure point of the overhead wire L in the section S2 in the same manner.

In the present embodiment, when the current transformers 18A4 and 17B2 for the instrument detect current values I _a and I _b higher than the predetermined current values and it is determined that a failure of the overhead wire L has occurred, the substation TSS-A and the substation In both of the TSS-B, the process of obtaining the distance from the TSS of the substation to the failure point of the overhead wire L is performed. When finding the distance D1 from the substation TSS- _A to the failure point of the overhead line L for the down train in the section S2, the railway electrification system turns off the transmission side circuit breakers 14A4 and 14B2, and the line of the substation TSS-A. The switch SW of the test device 15A4 is turned on, and the switch SW of the line test device 15B2 of the substation TSS-B is turned off. In this case, V _f = V _B and I _b = 0. Therefore, the second power supply unit 20A can obtain the distance D1 from the substation TSS- _A to the failure point of the overhead wire L in the section S2 by the above equation (3).

On the other hand, when the distance D2 from the substation TSS _- B to the failure point of the overhead line L for the down train in the section S2 is obtained, the railway electrification system turns off the transmission side circuit breakers 14A4 and 14B2, and the substation TSS-A. The switch SW of the line test device 15A4 of the substation TSS-B is turned off, and the switch SW of the line test device 15B2 of the substation TSS-B is turned on. In this case, V _f = _VA and I _a = 0. Therefore, the first power supply unit 10B can obtain the distance D2 from the substation TSS _- B to the failure point of the overhead line L in the section S2 by the following equation (4).
V _B = I _b (D ₂ x r) + V _A
D ₂ = (V _B - _VA ) / (I _b x r) ... (4)

Next, an example of a process flow for obtaining the distance D1 from the substation TSS- _A to the failure point of the overhead line L for the down train in the section S2 will be described with reference to FIG. FIG. 3 is a flowchart showing an example of a flow of processing for obtaining a distance from a substation to a failure point in the railway electrification system according to the present embodiment.

When detecting the failure point of the overhead line L for the down train in the section S2 (an example of a predetermined section), the second power supply unit 20A of the substation TSS-A turns off the transmission side circuit breaker 14A4 and turns off the transmission side circuit breaker 14A4. -The supply of DC power from A to the overhead line L for the down train in section S2 is cut off (step S301). Further, the first power supply unit 10B of the substation TSS-B also turns off the transmission side circuit breaker 14B2 to cut off the supply of DC power from the substation TSS-B to the overhead line L for the down train in the section S2. (Step S321). Further, the first power supply unit 10B controls the voltage transformer 17B2 to detect the current value _Ib of the current flowing from the substation TSS-B to the overhead wire L for the down train in the section S2, and the instrument. The voltage transformer 18B2 is controlled to detect the voltage VB of the DC power supplied from the substation TSS- _B to the overhead line L for the down train in the section S2 (step S322).

When the power transmission side circuit breaker 14A4 was turned off, the second power supply unit 20A of the substation TSS-A used the line test device 15A4 to perform a process of detecting the failure point of the overhead line L for the down train in the section S2. The number of times X (hereinafter referred to as the number of times of processing) is set to "1" (step S302). Next, the second power supply unit 20A acquires the voltage detection result of the instrument transformer 18A4 (step S303). Then, the second power supply unit 20A determines whether or not the voltage _VA detected by the instrument transformer 18A4 is lower than the predetermined threshold value V _min (step S304). Here, the predetermined threshold value V _min is the threshold value of the voltage at which it is determined that a failure has occurred in the overhead wire L.

When the voltage _VA detected by the voltage transformer 18A4 is equal to or higher than the predetermined threshold V _min (step S304: No), the second power supply unit 20A turns off the switch SW of the line test device 15A4 (step S305). ), And the transmission side circuit breakers 14A4 and 14B2 are turned on to supply DC power from the substations TSS-A and TSS-B to the overhead line L for the down train in the section S2 (step S306).

On the other hand, when the voltage _VA detected by the voltage transformer 18A4 is lower than the predetermined threshold V _min (step S304: Yes), the second power supply unit 20A turns on the switch SW of the line test device 15A4. The DC power stepped down by the voltage drop resistance LT of the line test device 15A4 is supplied to the overhead wire L for the down train in the section S2 (step S307). Next, the second power supply unit 20A controls the current transformer 17A4 for the instrument to detect the current value _Ia of the current flowing from the substation TSS-A to the overhead wire L for the down train in the section S2, and the instrument. The transformer 18A4 is controlled to detect the voltage _VA of the DC power supplied from the substation TSS-A to the overhead line L for the down train in the section S2 (step S308).

Next, the second power supply unit 20A determines whether or not the detected voltage _VA is lower than the predetermined voltage _VLT (step S309). Here, the predetermined voltage V _LT is a voltage applied to the voltage drop resistance LT when no abnormality has occurred in the overhead wire L. When the detected voltage _VA is equal to or higher than the predetermined voltage _VLT (step S309: No), the second power supply unit 20A determines that the overhead wire L for the down train in the section S2 has not failed, and The switch SW of the line test device 15A4 is turned off (step S310). After that, the second power supply unit 20A turns on the transmission side circuit breakers 14A4 and 14B2 to supply DC power from the substations TSS-A and TSS-B to the overhead line L for the down train in the section S2 (step S306). ).

On the other hand, when the detected voltage _VA is lower than the predetermined voltage _VLT (step S309: Yes), the second power supply unit 20A determines that the overhead line L for the down train in the section S2 has a failure. Moreover, it is prohibited to turn on the power transmission side circuit breakers 14A4 and 14B2 (step S311). That is, the second power supply unit 20A keeps the transmission side circuit breakers 14A4 and 14B2 off, and does not supply DC power from the substations TSS-A and TSS-B to the overhead line L for the down train in the section S2. .. Further, the second power supply unit 20A turns off the switch SW of the line test device 15A (step S312). Next, the railway electrification system determines whether or not the number of processes X is less than a predetermined number of times (for example, "2") (step S313). When the number of processes X is less than the predetermined number of times (step S313: Yes), the railway electrification system increments the number of processes X (step S314), and then returns to step S303. On the other hand, when the number of processes X is equal to or greater than a predetermined number (step S313: No), the railway electrification system sends maintenance information for instructing maintenance to the overhead line L for the down train in the section S2 to the terminal of the administrator of the railway electrification system. (Step S315).

The arithmetic unit C (an example of the first calculation unit) of the railway electrification system includes a current value I _a detected by the voltage transformer 17A4, a voltage _VA detected by the voltage transformer 18A4, and an instrument. When the voltage V _B detected by the voltage transformer 18B2 is input, the distance from the substation TSS-A to the failure point of the overhead wire L for the down train in the section S2 is calculated using the above equation (3). (Step S316). Then, the arithmetic unit C outputs the calculation result of the distance from the substation TSS-A to the failure point of the overhead line L for the down train in the section S2 to the external device. After that, the second power supply unit 20A proceeds to step S315.

Here, the process shown in step S316 is executed by a calculator C provided in the substation TSS-A, such as a switchgear that controls the power transmission side circuit breaker 14A4 and the power reception side circuit breaker 13, or a PLC (Programmable Logic Computer). Will be done. In this case, the arithmetic unit C receives the voltage VB detected by the voltage transformer 18B2 from the adjacent substation TSS- _B by using a preset transmission means.

Alternatively, the arithmetic unit C is an external control panel of the substation TSS-A (for example, an external control panel that controls the substation TSS, a control panel that transfers various information between the substation TSS and SCADA described later). It may be provided in. In this case, the external control panel was detected by the current value _Ia detected by the voltage transformer 17A4 and the voltage transformer 18A4 from the substation TSS-A by using a preset transmission means. The voltage V _A is received, and the voltage V _B detected by the voltage transformer 18B2 is received from the substation TSS-B.

Alternatively, the arithmetic unit C may be provided on a management device such as SCADA (Supervisory Control And Data Acquisition) that controls the entire railway electrification system or a medium using another computer. In this case, the management device (or other medium using a computer) uses a preset transmission means, and the current value _Ia and the instrument detected by the voltage transformer 17A4 from the substation TSS-A. The voltage VA detected by the voltage transformer 18A4 is received, and the voltage _VA detected by the voltage transformer 18B2 is received from the substation TSS- _B .

Next, an example of a process flow for obtaining the distance D2 from the substation TSS _- B to the failure point of the overhead line L for the down train in the section S2 will be described with reference to FIG. FIG. 4 is a flowchart showing an example of the flow of processing for obtaining the distance from the substation to the failure point in the railway electrification system according to the present embodiment. In the following description, the same processing as the flowchart shown in FIG. 3 will be omitted.

In step S312, when the switch SW of the line test device 15A is turned off, the first power supply unit 10B of the substation TSS-B turns on the switch SW of the line test device 15B2 (step S401). Next, the first power supply unit 10B controls the voltage transformer 17B2 to detect the current value _Ib of the current flowing from the substation TSS-B to the overhead wire L for the down train in the section S2, and the instrument. The voltage transformer 18B2 is controlled to detect the voltage VB of the DC power supplied from the substation TSS- _B to the overhead line L for the down train in the section S2 (step S402).

Then, the arithmetic unit C (an example of the second calculation unit) has a current value _Ib detected by the instrument transformer 17B2, a voltage _VA detected by the instrument transformer 18A4, and an instrument transformer 18B2. When the detected voltage V _B is input, the distance from the substation TSS-B to the failure point of the overhead wire L for the down train in the section S2 is calculated using the above equation (4) (step S403). .. After that, the arithmetic unit C outputs the calculation result of the distance from the substation TSS-B to the failure point of the overhead line L for the down train in the section S2 to the external device. In this case, the arithmetic unit C is a switchgear that controls the power transmission side circuit breaker 14B2 and the power reception side circuit breaker 13, the PLC of the substation TSS-B, the external control panel of the substation TSS-B, the management device, or other devices. It is installed on a medium using a computer.

In the present embodiment, the arithmetic unit C executes the above-mentioned process of obtaining the distance from the substation TSS to the failure point of the overhead line L while the railway electrification system is not in operation. For example, since the rail R of the train T may be damaged during the time when the railway electrification system is not operating and cause a short circuit failure, the arithmetic unit C is used for the substation TSS during the time when the railway electrification system is not operating. The process of finding the distance from the fault point of the overhead wire L to the failure point of the overhead wire L is executed. Further, before the railway electrification system is operated, DC power is not supplied to the overhead line L and it is prohibited to turn on the power receiving breaker 13, so that the railway electrification system is operated in the arithmetic unit C. The process of obtaining the distance from the substation TSS to the failure point of the overhead line L is executed at the time when the operation is not performed.

Next, using FIGS. 5 and 6, an example in which the arithmetic unit C is provided in the switchgear RyA (or the PLC of the substation TSS-A may be used) for controlling the power transmission side circuit breaker 14A3 of the substation TSS-A. Will be explained. FIG. 5 is a flowchart showing an example of a flow of processing for detecting a failure point in a substation of a railway electrification system according to the present embodiment. FIG. 6 is a diagram for explaining an example of a process of detecting a failure point in a switchgear of a substation of a railway electrification system according to the present embodiment.

For example, when detecting the failure point of the overhead line L for the up train in the section S2, the power transmission side circuit breakers 14A3 and 14B1 are turned off, and the overhead line for the up train in the section S2 from the substations TSS-A and TSS-B is turned off. The supply of DC power to L is cut off (step S501). Further, the switch SW of the line test device 15A3 is turned on, and the switch SW of the line test device 15B1 is turned off (step S502). Next, the instrument transformer 17A3 detects the current value _Ia , and the voltage transformer 18A3 detects the voltage _VA (step S503).

The switchgear RyA of the power transmission side circuit breaker 14A3 is used from the substation TSS-B (for example, the switchgear RyB of the power transmission side circuit breaker 14B1) by using a preset transmission means without using an external device (or externally). (Through the control panel of) receives the voltage VB detected by the voltage transformer _18B1 (step S504). After that, the switchgear RyA is used for the up train in the section S2 from the substation TSS-A based on the detected current value _Ia and voltage _VA , the received voltage _BB , and the resistance value r. The distance to the failure point of the overhead wire L is calculated (step S505). Then, the switchgear RyA outputs the calculated distance to the SCADA 500 via the control panel PA that controls the substation TSS-A. Further, the switchgear RyA displays the calculated distance on an HMI (Human Machine Interface) such as a display unit.

Next, an example in which the arithmetic unit C is provided in the switchgear RyB (which may be the PLC of the substation TSS-B) that controls the power transmission side circuit breaker 14B1 of the substation TSS-B will be described with reference to FIGS. 7 and 8. do. FIG. 7 is a flowchart showing an example of a flow of processing for detecting a failure point in a substation of a railway electrification system according to the present embodiment. FIG. 8 is a diagram for explaining an example of a process of detecting a failure point in a switchgear of a substation of a railway electrification system according to the present embodiment. The same processing as in FIGS. 5 and 6 will be omitted.

After the switchgear RyA of the substation TSS-A outputs the distance from the substation TSS-A to the failure point to the SCADA500 (step S701), the switch SW of the line test device 15A3 is turned off, and the line test device 15B1 The switch SW is turned on (step S702). Next, the instrument transformer 17B1 detects the current value I _b , and the voltage transformer 18B1 detects the voltage V _B (step S703).

The switchgear RyB of the power transmission side circuit breaker 14B1 is an instrument from the switchgear RyA of the power transmission side circuit breaker 14A3 using a preset transmission means without using an external device (or via an external control panel). The voltage _VA detected by the voltage transformer 18A3 is received (step S704). After that, the switchgear RyB from the substation TSS-B to the overhead line L for the up train in the section S2 based on the detected current value I _b and voltage V _B , voltage _VA , and resistance value r. The distance to the failure point of (step S705) is calculated. Then, the switchgear RyB outputs the calculated distance to the SCADA 500 via the control panel PB (step S706). Further, the switchgear RyB displays the calculated distance on the HMI of the display unit or the like.

Next, an example in which the arithmetic unit C is provided in the control panel PA for controlling the substation TSS-A will be described with reference to FIG. FIG. 9 is a diagram for explaining an example of a process of detecting a failure point in the control panel of the railway electrification system according to the present embodiment.

As shown in FIG. 9, when the power transmission side circuit breakers 14A3 and 14B1 are turned off, the switch SW of the line test device 15A3 is turned on and the switch SW of the line test device 15B1 is turned off, the control for controlling the substation TSS-A is controlled. The panel PA transfers the current value _Ia detected by the instrument current transformer 17A3 and the voltage VA detected by the instrument transformer 18A3 to the substation TSS- _A (for example, the transmission side) without going through an external device. Receives the switch RyA) of the circuit breaker 14A3. Further, the control panel PA receives the voltage VB detected by the voltage transformer 18B1 from the substation TSS- _B (for example, the switchgear RyB of the power transmission side circuit breaker 14B1) without going through an external device.

Next, the control panel PA starts from the substation TSS-A to the failure point of the overhead line L for the up train in the section S2 based on the received current value I _a , voltage _VA , voltage _VA , and resistance value r. Calculate the distance of. Then, the control panel PA transmits the calculation result of the distance from the substation TSS-A to the failure point of the overhead line L for the up train in the section S2 to the SCADA 500. As a result, the distance from the substation TSS to the failure point can be obtained without adding a new function to the switchgear RyA of the power transmission side circuit breaker 14A3 and the switchgear RyB of the power transmission side circuit breaker 14B1.

The control panel PA is a control panel that transfers various information between the SCADA 500 and the substation TSS-A, a control panel that exists outside the substation TSS-A and controls the substation TSS-A, and the substation TSS-. External devices outside A, devices outside the substation TSS-A and dedicated to controlling the substation TSS-A, etc., current value I _a , voltage _VA , voltage V _B , resistance value r, etc. Any device may be used as long as it has a communication function for transmitting and receiving various types of information.

Next, using FIG. 10, the control panel PA that controls the substation TSS-A receives the voltage VB from the switchgear RyB of the power transmission side circuit breaker 14B1 via the control panel PB that controls the substation TSS- _B . An example of acquiring is described. FIG. 10 is a diagram for explaining an example of a process of detecting a failure point in the control panel of the railway electrification system according to the present embodiment. In the following description, points different from the processing shown in FIG. 9 will be described.

As shown in FIG. 10, when the power transmission side circuit breakers 14A3 and 14B1 are turned off, the switch SW of the line test device 15A3 is turned on and the switch SW of the line test device 15B1 is turned off, the control for controlling the substation TSS-A is controlled. The panel PA receives the voltage VB detected by the instrument transformer _18B1 from the switchgear RyB of the power transmission side circuit breaker 14B1 via the control panel PB that controls the substation TSS-B. As a result, the distance from the substation TSS to the failure point can be obtained without adding a new function to the switchgear RyA of the power transmission side circuit breaker 14A3 and the switchgear RyB of the power transmission side circuit breaker 14B1. Further, the voltage VB detected by the voltage transformer _18B1 can be transmitted by using the existing transmission medium connecting the control panel PA and the control panel PB.

Next, an example in which the arithmetic unit C is provided in the SCADA 500 will be described with reference to FIG. FIG. 11 is a diagram for explaining an example of a process of detecting a failure point in SCADA of the railway electrification system according to the present embodiment.

As shown in FIG. 11, when the power transmission side circuit breakers 14A3 and 14B1 are turned off, the switch SW of the line test device 15A3 is turned on and the switch SW of the line test device 15B1 is turned off, the SCADA 500 is connected to the control panel PA via the control panel PA. , Receives the current value _Ia detected by the instrument current transformer 17A3 and the voltage VA detected by the instrument transformer 18A3 from the substation TSS- _A (for example, the switch RyA of the power transmission side circuit breaker 14A3). do. Further, the SCADA 500 receives the voltage VB detected by the voltage transformer 18B1 from the substation TSS- _B (for example, the switchgear RyB of the power transmission side circuit breaker 14B1) via the control panel PB. Then, the SCADA 500 is a distance from the substation TSS-A to the failure point of the overhead line L for the up train in the section S2 based on the received current value I _a , voltage _VA , voltage _VA , and resistance value r. Is calculated.

After that, as shown in FIG. 11, when the power transmission side circuit breakers 14A3 and 14B1 are turned off, the switch SW of the line test device 15A3 is turned off and the switch SW of the line test device 15B1 is turned on, the SCADA500 is subjected to the substation TSS-. The voltage VA detected by the voltage transformer 18A3 is received from _A (for example, the switchgear RyA of the power transmission side circuit breaker 14A3). Further, the SCADA 500 is detected from the substation TSS-B (for example, the switchgear RyB of the power transmission side circuit breaker 14B1) by the current value _Ib detected by the instrument current transformer 17B1 and by the voltage transformer 18B1. Receives voltage V _B. Then, the SCADA 500 is a distance from the substation TSS-B to the failure point of the overhead wire L for the up train in the section S2 based on the received current value I _b , voltage _VA , voltage _BB , and resistance value r. Is calculated. As a result, the voltages _VA and _BB and the current values I _a and I _b can be transmitted by using the existing transmission means for connecting the substation TSS and the SCADA 500.

As described above, according to the railway electrification system according to the present embodiment, when a failure occurs in the overhead line L, the process of turning on the power transmission side circuit breakers 14A4 and 14B2 from off to on is repeated, and the failure point of the overhead line L is set. The failure point of the overhead wire L can be obtained without providing another device for marking.

Although embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. This novel embodiment can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

TSS-A, TSS-B ... Substation, 10A, 10B ... First power supply unit, 11 ... Transformer, 12 ... Rectifier, 13 ... Power receiving side disconnector, 14A1, 14A2, 14A3, 14A4, 14B1, 14B2, 14B3 , 14B4 ... Power transmission side circuit breaker, 15A1,15A2,15A3,15A4,15B1,15B2, 15B3,15B4 ... Line test device, 16 ... Disconnector, 17A1,17A2, 17A3,17A4,17B1,17B2,17B3,17B4 ... Instrument Current transformer, 18A1,18A2, 18A3,18A4,18B1,18B2,18B3,18B4 ... Instrument transformer, 20A, 20B ... Second power supply unit, 30 ... Air section, C ... Computational unit, L ... Overhead wire, T ... train, S1, S2, S3 ... section, PA, PB ... control panel.

Claims (6)

A first circuit breaker that turns on or off the supply of DC power from the first substation to the overhead line of a predetermined section of the train.
A first resistor that drops the voltage of the DC power supplied from the first substation to the overhead wire, and a first switch that turns on or off the supply of the DC power whose voltage is dropped by the first resistance to the overhead wire. And a first device that has and is connected in parallel to the first circuit breaker.
A first voltage detection unit that detects the first voltage of the DC power supplied from the first substation to the overhead line, and
A first current detection unit that detects the first current value of the current flowing from the first substation to the overhead line, and
A second circuit breaker that turns on or off the supply of DC power from the second substation, which is different from the first substation, to the overhead line.
A second resistor that drops the voltage of the DC power supplied from the second substation to the overhead wire, and a second switch that turns on or off the supply of the DC power whose voltage is dropped by the second resistance to the overhead wire. And a second device that has and is connected in parallel to the second circuit breaker.
A second voltage detection unit that detects the second voltage of the DC power supplied from the second substation to the overhead line, and
The first voltage, the first current value, and the second voltage when the first circuit breaker and the second circuit breaker are turned off, the first switch is turned on, and the second switch is turned off. A first calculation unit that calculates the length from the first substation to the failure point of the overhead wire based on the resistance value per predetermined length of the overhead wire.
A single point of failure determination system. A second current detection unit that detects the second current value of the current flowing from the second substation to the overhead line, and
The first voltage, the second voltage, and the second current value when the first circuit breaker and the second circuit breaker are turned off, the first switch is turned off, and the second switch is turned on. A second calculation unit that calculates the length from the second substation to the failure point of the overhead wire based on the resistance value.
The failure point determination system according to claim 1. The first calculation unit is provided in the first substation and receives the second voltage from the second substation without going through an external device.
The failure point determination system according to claim 2, wherein the second calculation unit is provided in the second substation and receives the first voltage from the first substation without going through an external device. The first calculation unit is provided in a control panel that controls the first substation, receives the first voltage and the first current value from the first substation without going through an external device, and has the first. 2. The failure point determination system according to claim 1, wherein the second voltage is received from the substation without going through an external device. The first calculation unit is provided in a control panel that controls the first substation, receives the first voltage and the first current value from the first substation without going through an external device, and has the first. 2. The failure point determination system according to claim 1, wherein the second voltage is received from the second substation via a control panel that controls the substation. The first calculation unit and the second calculation unit are provided in a management device that controls the entire railway electrification system having the failure point determination system, and the first substation is provided via a control panel that controls the first substation. A request for receiving the first voltage and the first current value from the place and receiving the second voltage and the second current value from the second substation via a control panel outside the second substation. Item 2. The failure point determination system according to item 2.

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