JP2007288921A - Switchgear control and monitoring system - Google Patents

Abstract

An object of the present invention is to provide an opening / closing device control / monitoring system suitable for efficient opening / closing device, efficient communication with a process bus, a redundant configuration ensuring sufficiently high reliability, and synchronous opening / closing control.
The switchgear control / monitoring arithmetic unit 1 and the switchgear control / monitoring input / output units 2 to 5 share the configuration and functions, and the switchgear control / monitoring input / output unit 2 semiconductor. Two circuit breaker drive circuits for driving the switch 21 are provided to provide a redundant configuration, enabling efficient arrangement to the switchgears 102 to 104, efficient communication with the process bus 110, and sufficiently reliable configuration It was.
[Selection] Figure 3

Description

  The present invention relates to a switchgear control / monitoring system for controlling and monitoring a switchgear installed in an electric station such as a substation, and more particularly to a switchgear control / monitoring system suitable for synchronous switching control of a circuit breaker.

  A substation equipment installed in a substation is usually provided with a plurality of substation equipment, a device control / monitoring system unit, a host system unit including a protection / control device and the like. Among these, switch devices and transformers are examples of main equipment of the transformer equipment. The device control / monitoring system unit is disposed near the substation equipment and controls and monitors the substation equipment, and specifically corresponds to a field control panel. The host system unit is responsible for supplying control information and power for the substation equipment to the device control / monitoring system unit.

  The switchgear includes, for example, a lightning arrester, a line-side disconnector, a circuit breaker, a main bus disconnector, a main bus, a current transformer that is a current detection means of the main circuit, an instrument transformer that is a voltage detection means of the main circuit, and further control And a field control panel that performs monitoring.

  The device control / monitoring system section of the switchgear is usually composed of an on-site control panel installed for each line of the switchgear, and various switch contacts and relay contacts as a control circuit for operating the switchgear. Is used.

  A control cable is wired as a transmission means between the switchgear main unit and the on-site control panel, which is the equipment control / monitoring system unit, and the switchgear on / off status information, failure information, and operation are transmitted through this control cable. Information such as lock information and operation command information is transmitted.

  The field control panel is provided with a circuit breaker control circuit including a closing circuit, a tripping circuit, a phase loss detection circuit, and the like. Among these, the closing circuit is composed mainly of a closing command input terminal, a changeover switch, an anti-pumping relay, and a closing coil. The trip circuit includes a trip command input terminal, a changeover switch, an operation switch, a relay relay, and a trip coil as main components.

  The circuit breaker control circuit further includes an auxiliary switch contact indicating the operating position of the circuit breaker body, a gas density switch that generates an operation output when the gas pressure of the circuit breaker body decreases, or when the hydraulic pressure of the hydraulic operation mechanism of the circuit breaker body decreases Are provided with relay contacts that relay a hydraulic switch that generates an operation output, and these contacts have a function of preventing the operation lock of the circuit breaker and the command signal from continuing for a certain period of time. The disconnector control circuit also includes similar switches.

  The host system section is installed in the substation control room, and from the field control panel having the above-described configuration, the auxiliary switch contact signal indicating the operating position of the switchgear, the gas pressure drop, the oil pressure drop signal, and the variable In addition to taking in the flow signal of the current collector and the instrument, the control information of the switchgear, the protection relay signal and the power source are supplied to each field control panel (for example, see Patent Document 1).

  For substation equipment consisting of the switchgear main unit, equipment control / monitoring system unit and host system unit as described above, for digital type instruments that detect the AC electricity quantity of the switchgear main unit and convert it to digital value and output the digital value There has been proposed a substation equipment protection control system in which a transformer and a protection control system are coupled by communication means (see, for example, Patent Document 2).

  The communication means includes a process bus which is a serial transmission medium, and a host system such as a digital instrument transformer, a protection / control device and the device control / monitoring system unit are connected by the process bus. In addition to digitized AC electricity on the process bus, digitized device control / monitoring system data such as electrical data, operating status data, and switching commands of the switchgear body are communicated. ing.

  In such a digitized substation equipment protection control system, the equipment control / monitoring system section is provided as a switching device control / monitoring unit that is individually arranged in each switching equipment such as a circuit breaker and a disconnecting switch.

The switchgear control / monitoring unit includes data collection means for capturing sensor output signals such as electrical quantity data and operation state data of the switchgear body, data storage means for storing the collected data as device control monitoring data, Equipped with a digital arithmetic processor that performs control and monitoring operations, a drive circuit consisting of a semiconductor switch that outputs signals to the drive unit of the substation equipment, and communication means, and compares and determines control signals and device control monitoring data from the host system And a function of monitoring, a function of outputting a drive signal to the switchgear drive unit based on the determination result, and a function of transmitting the device control monitoring data and the determination result to the host system.
JP 2002-354617 A JP 2002-315233 A

  In the substation equipment protection control system described in Patent Document 2, the switchgear control / monitoring unit is coupled by a process bus and is individually installed in a switchgear such as a circuit breaker or a disconnector. Therefore, it is necessary to install switchgear control / monitoring units as many as the number of circuit breakers and disconnectors in the entire substation. Normally, it is composed of 4 switchgears with 1 circuit breaker and 3 disconnectors per transmission line, so assuming 10 substations, 40 switchgears for 40 switchgears A device control and monitoring unit is required.

  In addition, the switchgear control / monitoring unit described in Patent Document 2 has a configuration in which each unit has a digital arithmetic processor (CPU), but it is necessary for control per breaker or disconnector. Such a configuration is very inefficient when considering the resource efficiency of the digital processor because the computational burden imposed is very light. In the vicinity of the circuit breaker and disconnector, the level of electrical surge generated during the operation of the switchgear is extremely high, and a switchgear control / monitoring unit with a digital processor is placed in such a harsh environment. It is not preferable to do.

  Further, in the invention described in Patent Document 2, as described above, the same number of switchgear control / monitoring units as the number of circuit breakers and disconnectors are installed. This means that the same number of switchgear control / monitoring units are provided on the process bus. Means that the unit is connected. As a result, an excessive communication burden is imposed on the process bus, which is inefficient from the viewpoint of communication.

  Furthermore, in the switchgear control / monitoring unit described in Patent Document 2, it is difficult to realize a redundant configuration having sufficient reliability that is considered necessary for control of the switchgear.

  Furthermore, in recent years, the so-called circuit breaker synchronous opening / closing control in which the contactor of the circuit breaker is opened or closed at a predetermined phase of the main circuit current or the main circuit voltage has become widespread. It is considered that it is necessary to equip the monitoring unit with a synchronous opening / closing control function.

  However, in the switchgear control / monitoring unit described in Patent Document 2 described above, since the switching drive signal to the semiconductor switch is performed only by software control based on the calculation of the digital arithmetic processor, the synchronous switching control of the circuit breaker is sufficient. Realizing with accuracy is considered difficult.

  The present invention has been made in order to solve the above-described problems, and its purpose is to ensure efficient placement on the switchgear, efficient communication with the process bus, and sufficiently high reliability. It is an object of the present invention to provide a switchgear control / monitoring system suitable for redundant configuration and synchronous switching control.

  In order to achieve the above object, the invention according to claim 1 is a digital data output means for inputting a main circuit alternating current electric quantity of a switchgear body and outputting digital data, and output from the digital data output means. Protection control means 112 and 113 for monitoring, controlling and protecting the switchgear main body 102, and commands from the protection control means 112 and 113 are inputted through the communication means 110 forming the information transmission path. In the switchgear control / monitoring system comprising: a switchgear control / monitoring unit A that receives the communication means 110 that forms the information transmission path and monitors and controls the switchgear main body. The monitoring unit captures the switch state data which is a contact point such as electric quantity data and operation state data related to the switchgear, or a sensor output signal. Switch control / monitoring input / output unit comprising: a data collecting means for receiving data; a drive circuit comprising a semiconductor switch for outputting an open / close drive signal to the drive unit of the switchgear; and a logic circuit for controlling an open / close timing applied to the semiconductor switch A digital arithmetic processor for performing opening / closing control calculation and monitoring calculation of the switchgear, data storage means for storing the switchgear state data transmitted from the switchgear control / monitoring input / output unit, and the communication means It is characterized by comprising a switchgear control / monitoring arithmetic unit provided with a communication interface to be connected.

  According to a ninth aspect of the present invention, the contact of the circuit breaker is opened or closed at a predetermined phase of the main circuit current or the main circuit voltage in response to the protection command or control command from the protection control means. In performing the control, the logic circuit of the switchgear control / monitoring input / output unit operates the semiconductor switch by delaying the protection command or control command by a predetermined time, and this predetermined delay time. Is calculated based on the main circuit current or main circuit voltage acquired from the digital data output means by the digital arithmetic processor of the switchgear control / monitoring arithmetic unit.

  Further, the invention according to claim 10 is the circuit breaker temperature data, circuit breaker operation pressure data, circuit breaker control voltage data, circuit breaker operation time data, circuit breaker operation frequency acquired by the switchgear control / monitoring input / output unit, The delay time is corrected using at least one of the breaker pause times.

  ADVANTAGE OF THE INVENTION According to this invention, the efficient arrangement | positioning to a switching device, the redundant structure which ensured sufficiently high reliability, and the switching device control and monitoring system suitable for synchronous switching control can be provided.

  Embodiments of a switchgear control / monitoring system according to the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same part through each figure, and the overlapping description is abbreviate | omitted suitably.

(Embodiment 1)
First, an outline of a digitized substation protection control system according to the present embodiment will be described with reference to FIG.

  FIG. 1 shows an example of a switchgear for one transmission line as a substation, and the switchgear includes a double main bus 101, a circuit breaker (CB) 102, and this circuit breaker (CB). Between the bus-side disconnector (DS) 103 and the line-side disconnector (DS) 104 disposed on the busbar side and the line side of 102, respectively, between the breaker (CB) 102 and the busbar side disconnector (DS) 103, Current transformers 105 and 106 disposed between the circuit breaker (CB) 102 and the line side disconnector (DS) 104, respectively, and an instrument transformer disposed on the line side of the line side disconnector (DS) 104 It consists of 107 and.

  In the vicinity of the circuit breaker 102, the bus-side disconnector 103, and the line-side disconnector 104, there are switch control / monitoring input / output units (denoted as CBI / O and DSI / O in the figure) 2 to 5, respectively. Is installed. The switchgear control / monitoring input / output units 2 to 5 are connected to the control / monitoring calculation unit 1 via the switchgear control / monitoring calculation unit communication means 6 made of an optical fiber.

  In this embodiment, the switchgear control / monitoring operation unit 1 provided for each line in this way, the switchgear control / monitoring input / output units 2 to 5 installed for each circuit breaker and disconnector, A set of units constituted by the switch control / monitoring arithmetic unit communication means 6 such as a fiber is referred to as a switch control / monitor unit A.

  Although the earthing switch is omitted in FIG. 1, the switch control / monitoring input / output unit for the disconnecting switch and the switch control / monitoring input / output unit for the grounding switch may be combined, or provided separately. Also good. In this case, it goes without saying that the switchgear control / monitoring input / output unit for the ground switch is included in the switchgear control / monitoring unit.

  On the other hand, in the present embodiment, a digital current transformer and a digital instrument transformer are adopted as the current transformer and the instrument transformer, respectively, in the vicinity of the current detectors 105 and 106 and the voltage detector 107, respectively. A digital converter (denoted as SU in the figure) 108 as a digital data output means is provided. Each digital converter (SU) 108 is connected to a merging unit (denoted as MU in the figure) 111 that collects and edits data of the digital converter by communication means 109 made of an optical fiber.

  In the present embodiment, the digital current transformers 105-108 and 106-108 and the digital instrument transformer 107-108 configured as described above, the communication means 109 made of optical fiber, and a merging unit (MU). The unit set consisting of 111 is referred to as a digital instrument transformer unit B.

  The switchgear control / monitoring arithmetic unit 1 of the switchgear control / monitoring unit A and the merging unit (MU) 111 of the digital instrument transformer unit B are a process bus or a process LAN (hereinafter simply referred to as process bus). 110, and a bay control unit (indicated as BCU in the figure) 113 having a monitoring control function for each line is connected to the process bus 110. In some cases, the protection relay unit 112 and the bay control unit 113 are not configured separately, but are configured integrally. The protection relay unit 112 and the bay control unit 113 are collectively referred to as protection control means.

  FIG. 2 is a diagram illustrating an example of functions and configurations corresponding to the circuit breaker 102 in the switchgear control / monitoring arithmetic unit 1 illustrated in FIG. 1. Functions and configurations corresponding to the disconnectors 103 and 104 are illustrated. Not. FIG. 3 is a diagram showing an example of functions and configurations corresponding to the switch control / monitoring input / output unit 2 for the circuit breaker 102 shown in FIG.

  First, FIG. 2 will be described. The switchgear control / monitoring arithmetic unit 1 is composed of a digital arithmetic processor (CPU) 11, a switchgear state data storage means 12, an I / O communication interface 13, and an internal bus 14 in terms of functions. Has been.

  Among them, the digital arithmetic processor (CPU) 11 performs switching control calculation and monitoring calculation related to the circuit breaker 102. Specifically, as shown in the figure, the circuit breaker 102 switching state monitoring, phase loss monitoring, Operation lock, interlock, etc. are performed based on monitoring calculations such as gas pressure monitoring, oil pressure monitoring, oil level monitoring, other device monitoring calculations, and selection completion confirmation (Selected confirmation).

  The switchgear state data storage means 12 stores the circuit breaker state data transmitted from the switchgear control / monitoring input / output unit 2 shown on the left side of the switchgear control / monitoring arithmetic unit 1 as an I / O communication interface. Capture via 13 and save. The internal bus 14 is used for input / output of data of the digital arithmetic processor (CPU) 11, as well as a switchgear control / monitoring input / output unit (DSI / O) 3 and a switchgear control / monitoring input / output unit (DSI / O). O) Input and output a and b contact information with 5.

  On the other hand, the process bus 110 inputs and outputs voltage and current information to and from the merging unit (MU) 111, inputs and outputs trip commands and reclosing commands to and from the protection relay unit 112, and the bay control unit ( BCU) 113 is used to input / output signals such as selection / control. In the protective relay unit 112, the main 112-1 and the FD 112-2 mean a main detection relay unit and an accident detection (fail-safe) relay unit, respectively.

  Next, FIG. 3 will be described. The circuit breaker switchgear control / monitoring input / output unit (indicated as CB I / O in the figure) 2 is connected to the closing coil (CC) or tripping coil (TC), which is the driving coil of the circuit breaker 102. A drive circuit having a semiconductor switch 21 that directly applies a disconnecting current, and a duplicated logic circuit 22 that outputs a drive signal based on a turn-on (reclose) or cut-off (open) command to the semiconductor switch {first logic Circuit: FD / selection drive logic circuit (PLD-1) 22-1, second logic circuit: main / control drive logic circuit (PLD-2) 22-2}, and circuit breaker status contact (a contact) , B contact), hydraulic switch, oil level switch, digital input circuit (DI) 23 as data collecting means for inputting contact information such as hydraulic pump motor circuit 49M, command current, gas pressure, temperature, hydraulic pressure, control Voltage, stroke Analog input circuit (AI) 24 as data collecting means for inputting analog information such as, digital output circuit (DO) 25 for outputting digital control commands to hydraulic pump motor (88M), GCB operation count, hydraulic pump It is composed of a control circuit (PLD-3) 26 that counts the number of operations and transmits the control / monitoring arithmetic unit 1. Thus, the circuit breaker switchgear control / monitoring input / output unit 2 of this embodiment does not use any digital arithmetic processor.

  The first and second logic circuits 22-1 and 22-2 and the control circuit 26 are not limited to the PLD, but may be replaced with an FPGA. The PLD mentioned above is a programmable logic device (Programmable Logical Device), or the FPGA is a field programmable gate array (Field Programmable Gate Array).

  In order to increase the reliability of the circuit breaker tripping circuit and closing circuit, the semiconductor switch 21 is divided into four semiconductor switches, one for the tripping coil (TC) and one for the closing coil (CC). Moreover, they are connected to the trip coil (TC) and the closing coil (CC) so as to be in two series and two in parallel. In addition, a current detection resistor 27 is connected in series to the semiconductor switch 21, and a circuit breaker is obtained by taking out a coil current or a trip coil current as electrical quantity data of the switchgear from the terminal of the current detection resistor 27. The switching command current can be detected. If necessary, an inspection semiconductor switch or the like may be connected in series.

  Next, the first logic circuit 22-1 and the second logic circuit 22-2 will be described. Details of these functions and configurations will be described with reference to FIG.

  The first logic circuit 22-1 and the second logic circuit 22-2 each receive a coded control command from the control / monitoring arithmetic unit 1 shown on the right side of the figure, and perform an inverted double sign check. A decoding process is performed, and a drive signal is output to the semiconductor switch 21 based on a control command.

  The first logic circuit 22-1 outputs a drive signal to two parallel-connected semiconductor switches 21 inserted on the coil (TC) terminal side of the trip circuit and the coil (CC) terminal side of the closing circuit, respectively. Is configured to do.

  On the other hand, the second logic circuit 22-2 outputs a drive signal to the two parallel-connected semiconductor switches 21 inserted in the trip circuit and input circuit on the anode terminal side of the DC power supply Bat (battery). It is configured as follows.

  The digital input signals inputted to the digital input circuit (DI) 23, such as circuit breaker status contacts (a contact, b contact), hydraulic switch, oil level switch, 49M contact of the hydraulic pump motor circuit, etc. are supplied to the control circuit 26. To be input.

  Analog input data such as a gas pressure sensor, a temperature sensor, a hydraulic pressure sensor, a control voltage sensor, a stroke sensor, and a command current input to the analog input circuit (AI) 24 are rearranged in time series by a multiplexer (MPX). Thereafter, it is converted into digital data by an analog / digital converter (A / D) and input to the control device 26.

  The digital output circuit (DO) 25 outputs the command output from the control circuit 26 to the hydraulic pump motor circuit as a drive contact 88M.

  As described above, the control circuit 26 inputs data from the digital input circuit (DI) 23 and the analog input circuit (AI) 24, confirms the selection completion (Selected confirmation), and monitors the drive circuit (continuous monitoring of the semiconductor switch). By inputting a monitoring circuit output such as coil disconnection monitoring, the operation count of the gas circuit breaker (GCB), the operation count of the hydraulic pump, the motor control of the hydraulic pump control circuit, and the like are performed. The drive circuit monitoring and coil disconnection monitoring are performed by detecting the voltage across the terminals of the semiconductor switch.

  Further, the control circuit 26 monitors the running of the switchgear control / monitoring input / output unit 2 and transmits the result to the switchgear control / monitoring arithmetic unit 1 via an I / O communication interface (not shown). In addition, when data is transmitted to the switchgear control / monitoring arithmetic unit 1, data is converted to Manchester code and transmitted with a CRC code added to improve reliability. A code format and a data check method may be used.

  The switchgear control / monitoring input / output units 3 to 5 for the disconnectors 103 and 104 or a grounding switch (not shown) are the same as the switchgear control / monitoring input / output unit 2 for the circuit breaker 102 described above. The description is omitted.

  Next, the function and configuration of the circuit breaker drive circuit (CMU) 29 in the switchgear control / monitoring input / output unit 2 will be described with reference to FIG.

  In FIG. 4, since the circuit breaker drive circuit (CMU) 29 is duplexed, the first and second logic circuits 22-1 and 22-2 are respectively connected to the switchgear control / monitoring arithmetic unit 1 system. The switching control / monitoring input / output unit 2 is configured so that the switching command information transmitted from both the switching control / monitoring operation unit 2 system is taken in, and the command signal contradiction due to the duplex transmission does not occur. As transmission error processing, command signal encoding and inverted double code check are employed. For this reason, the first logic circuit 22-1 and the second logic circuit 22-2 are each configured to perform a decoding process after performing an inverted double code check on the coded command signal.

  In addition, in order to realize independent control of the protection function and control function and ensure sufficient reliability, the eight semiconductor switches are connected to the trip coil (TC) so that the input circuit and trip circuit are independent for protection and control. ) And for the input coil (CC) are divided into four units and connected in series and in parallel, and each semiconductor switch 21 is controlled by separate logic circuits 22-1 and 22-2. This is as described in FIG. As described above, the GCB drive circuit of the present embodiment has a redundant configuration that prevents malfunctions by adopting an eight-contact configuration (eight semiconductor switch configuration).

  Note that the circuit breaker drive output by the semiconductor switch 21 is output under the AND condition with the a contact ON for the break (open) command and the AND condition with the b contact ON for the closing (reclosed) command. Accordingly, the first logic circuit 22-1 and the second logic circuit 22-2 are configured to capture the a contact information and the b contact information.

  In addition, the selection completion confirmation signal (Selected confirmation) in the control is a circuit breaker drive signal for the semiconductor switch (that is, the output side of the logic circuit) in accordance with the design concept of the on-site control panel which is a conventional device control / monitoring system section. I will wrap more. When the logic circuit 22 breaks down, there is a high possibility that it directly leads to a malfunction of the circuit breaker 102. In order to prevent the circuit breaker malfunction due to simultaneous failure of the first logic circuit 22-1 and the second logic circuit 22-2, there are many modes that stick to the Hi side or Lo side as all failure modes of the logic circuit 22. In addition, the design is such that the positive and negative logics of the first logic circuit 22-1 and the second logic circuit 22-2 are reversed.

  That is, in the first logic circuit 22-1, the trip signal and the phase loss interruption signal of the FD relay are configured to give an operation command to the semiconductor switch 21 via the OR circuit OR. In addition, a logic circuit (corresponding to 86 circuits in the field control panel, which is a conventional device control / monitoring system unit) that blocks the selection control command when the protective relay is operated is assigned to an inhibition circuit (IH: inhibit circuit). Further, the anti-pumping relay circuit performs anti-pumping control during reclosing (FD). And at the time of the selection command mentioned above, it is comprised so that selection completion confirmation (Selected confirmation) may be performed.

  In the second logic circuit 22-2, the trip signal and the phase loss interruption signal of the main relay are configured to output an OR circuit (OR). In addition, when the protective relay is activated, an open command or a closing command is blocked by an inhibition circuit (IH). Furthermore, the anti-pumping relay circuit is configured to perform anti-pumping control at the time of reclosing and closing.

  The outputs of the OR circuit (OR), the prohibition circuit (IH), and the anti-pumping relay circuit are inverted by a knot circuit (NOT), respectively, to give an operation command to the semiconductor switch 21 on the anode side of the DC power supply Bat. It is configured.

  In order to prevent malfunction of the circuit breaker due to the failure of the power supply monitoring circuit (PAL) 28, the power supply monitoring circuit PAL has a double configuration, and the first logic circuit 22-1 and the power supply monitoring circuit (PAL-1) 28- 1. A combined configuration of a second logic circuit 22-2 and a power supply monitoring circuit (PAL-2) 28-2 is employed.

  In this embodiment, the semiconductor switch is controlled by the same logic circuit for protection and control, but it goes without saying that control may be performed using separate logic circuits in order to further improve the reliability. . The first logic circuit 22-1 shares the FD relay selection drive and the second logic circuit 22-2 shares the main relay control drive, but it goes without saying that this combination can be arbitrarily changed. There is no.

  FIG. 5 shows that the output signals of the main detection relay (main) and the accident detection relay (FD) at the time of protection, that is, at the time of trip or reclosing, are output from the protection relay unit 112 to the switching device control / monitoring input / output unit and switching Shows the basic flow of a series of circuit breaker drive signals from the device control / monitoring arithmetic unit (logic circuit) to the drive signal of the switchgear control / monitoring arithmetic unit (semiconductor switch), and at the time of control, that is, open Output signal when switching from selection to completion of selection and control at the time of turning on or off, from bay control unit (BCU) to switchgear control / monitoring input / output unit, switchgear control / monitoring arithmetic unit (logic circuit) The basics of a series of circuit breaker drive signals from the switch control / monitoring arithmetic unit (semiconductor switch) to the drive signal It illustrates the trend.

  As described above, according to the switchgear control / monitoring system of this embodiment, the switchgear control / monitoring arithmetic unit 1 and the switchgear control / monitoring input / output units 2 to 5 are configured and functioned in two types of units. By sharing the above, efficient arrangement to the switchgears 102 to 104 and efficient communication with the process bus 110 become possible.

  In addition, since the redundant configuration of the circuit breaker drive circuit of the switch control / monitoring input / output unit 2 is sufficiently reliable, sufficient reliability can be obtained as a system that does not reduce the reliability of the protection relay. it can.

  Further, as described above, the circuit breaker status contact (a contact, b contact), hydraulic switch, oil level switch, 49M contact of hydraulic pump motor circuit, gas pressure sensor, temperature sensor, hydraulic sensor, control voltage sensor, stroke sensor , Command current detection, circuit breaker operation frequency count, hydraulic pump operation frequency count function, circuit breaker operation frequency monitoring, circuit breaker operation time monitoring, gas leak monitoring, hydraulic pump operation frequency monitoring, circuit breaker stroke waveform Equipment monitoring such as monitoring is possible.

  Furthermore, the drive control and monitoring of the switchgear main body, which has been realized by combining an auxiliary relay and a timer relay with a conventional on-site control panel, runs on the digital arithmetic processor (CPU) 11 of the switchgear control / monitoring arithmetic unit 1. Since it is realized by software and the operation mechanism unit is driven by a semiconductor switch of a drive circuit (CMU), functions equivalent to the on-site control panel can be realized by several substrate circuits.

  In addition, the number of man-hours for mounting control components and electric wiring can be greatly reduced by using a control circuit board. The existing on-site control panel can be abolished, and the switchgear control / monitoring unit can be built into the switchgear body. Therefore, the switchgear body can be made more compact and the total cost can be reduced. Maintenance can be integrated.

  In addition, since the control and monitoring of the equipment is realized by software, the hardware design is changed to change the control and monitoring conditions that differ depending on the model and operation mode, such as interlock conditions, and to expand the control and monitoring functions. However, it can be easily realized by changing the software.

  In addition, since the switch control / monitoring units of each bay are connected to each other via a process bus, in addition to monitoring and controlling the interlock status from a host system such as a monitor control device, a plurality of switch control / control units are provided. Since the monitoring units can monitor and control each other, the reliability of the interlock can be improved. In addition, since it is possible to prevent the interlock from being released accidentally by a command from the host system during the inspection of the equipment, it is possible to improve the safety during the inspection of the equipment.

Needless to say, device monitoring of disconnectors and ground switches is the same.
Needless to say, the redundant configuration such as transmission encoding format, transmission error detection method, duplexing, and two-sequencing is not limited to the above-described method, and other methods can be applied.

(Embodiment 2)
Next, the positioning of the switchgear control / monitoring unit in the digitized switchgear protection control system according to the second embodiment will be described with reference to FIG.

  In FIG. 6, the process control unit 120 includes a protection relay unit 112, a bay control unit 113 (BCU) (the protection relay unit 112 and the bay control unit 113 may be integrated), and a merging unit (MU) 111. , The process bus communication means 122 and the switching device control / monitoring arithmetic unit 1 are mounted on a printed circuit board, and these printed circuit boards are provided on the back board on the back of the collective case (parallel bus (internal bus) 121). It is set as the structure connected by.

  As in the case of the first embodiment, the switchgear control / monitoring arithmetic unit 1 of the present embodiment is composed of the switchgear control / monitoring input / output units 2 to 5 and the switchgear control / monitoring arithmetic unit communication means 6 comprising optical fibers. It is connected.

The process bus communication means 122 relays communication between the parallel bus 121 and the process bus 110 and converts a communication protocol.If necessary, via a bus arbitration device such as the switching hub 130, It is connected to the switching device control / monitoring arithmetic unit 1 and the merging unit 111 located at the lower level, and further connected to various units and the like in other bays not shown.
The detailed configuration of the switchgear control / monitoring unit and the detailed configuration and operation of the circuit breaker drive circuit including the semiconductor switch 21 and the logic circuit 22 are the same as those in the first embodiment, and thus the description thereof is omitted.

  Thus, in this embodiment, the protection relay unit 112, the bay control unit (BCU) 113, the merging unit (MU) 111, the process bus communication means 122, and the switchgear control / monitoring arithmetic unit 1 are included in one collective case. Because it is configured to be connected to the parallel bus 121 by a backboard, the process bus configuration scale can be reduced and it can be stored compactly in the collective case, so it is easy to secure the installation space of the collective case, etc. It can be said that it is most suitable for the form installed in the main body or in the vicinity of the main body.

  In addition, when the protection relay unit 112, the bay control unit (BCU) 113, the merging unit (MU) 111, the process bus communication means 122, and the switchgear control / monitoring arithmetic unit 1 are configured with substrates, it corresponds to the failure of each substrate. There is a maintenance advantage that only the board can be replaced. In addition, when the functions of a plurality of units are mounted on the same board, the number of boards can be reduced and the number of circuit parts can be reduced, and there is an advantage that the failure rate can be reduced, the cost can be reduced, and the size can be reduced. .

The function as the switchgear control / monitoring unit is the same as that of the first embodiment, but the switchgear control / monitoring arithmetic unit 1 includes a protection relay unit 112, a bay control unit (BCU) 113, and a merging unit (MU). By connecting 111 and the parallel bus (internal bus) 121, it is possible to exchange data between units at higher speed and higher reliability than in the first embodiment, and as a result, a more reliable system can be constructed.
Needless to say, the second embodiment has all the effects of the switchgear control / monitoring system described in the first embodiment.

(Embodiment 3)
In this embodiment, the circuit breaker contacts (contactors) are opened and closed at a predetermined phase of the main circuit current or the main circuit voltage. It is concerned.

That is, the switchgear control / monitoring system of the present embodiment is configured so that the circuit breaker contacts are set to a predetermined main circuit current or main circuit voltage in response to a protection command or control command from the protection relay unit 112 / bay control unit 113. When performing control for opening and closing at the phase, the logic circuit 22 of the switchgear device control / monitoring input / output unit 2 delays the protection command or control command by a predetermined time, and The semiconductor switch 21 is operated, and this predetermined delay time is determined by the main circuit current or main circuit voltage obtained from the digital converter (SU) 108 by the digital arithmetic processor (CPU) 11 of the switchgear control / monitoring arithmetic unit 1. It is made to calculate based on.
Note that the configuration of the switchgear control / monitoring unit in the present embodiment can employ either the configuration of the first embodiment or the second embodiment.

FIG. 7 is a timing chart of the synchronous opening control.
The opening command signal (tripping command or shut-off command) is sent from the bay control unit (BCU) 113 (or the protection relay unit 112) via the process bus 110 at the timing of t _{command to} control the switching device 1 is transmitted.

After receiving the opening command signal, the switchgear control / monitoring arithmetic unit 1 waits for the timing of the zero crossing point of the next main circuit current, and synchronizes with this timing with a delay time of the synchronous opening delay time T _delay. An opening control signal (TCSS) is output to drive the trip coil (TC).
Here, ideally, the synchronous opening delay time T _delay is obtained by the following equation.

T _delay = T _freq + (T _target − (T _opening % T _freq ))
(0 ≦ T _delay <2 × T _freq )
However, (T _opening % T _freq ) is the remainder of T _opening / T _{freq In} the synchronous _opening / closing control system using the switching device control / monitoring unit, the following roles are assigned to perform synchronous opening control.

<Role of switchgear control / monitoring arithmetic unit 1>
(I) The zero cross point of the main circuit current is detected. However, the main circuit current waveform is acquired from the merging unit (MU) 111 via the process bus 110.
(Ii) After receiving the opening command signal, the time until the timing of the zero cross point of the next main circuit current is calculated.
(Iii) A synchronous opening delay time T _delay is calculated based on the timing of the zero cross point of the main circuit current.
(Iv) The synchronous opening delay time T _delay is transmitted to the switch control / monitoring input / output unit 2.

The synchronous opening delay time T _delay transmitted to the switchgear control / monitoring input / output unit 2 includes an ideal delay time, a transmission delay to the switchgear control / monitoring input / output unit 2, a zero cross point, and a transmission timing. Add corrections to account for misalignment.

<Role of switchgear control / monitoring input / output unit 2>
(I) After receiving the opening command from the switchgear control and monitor operation unit 1, only the synchronous receiving opening delay time T _delay amount, counts the delay timer.
The delay timer is counted by the first logic circuit 22-1 and the second logic circuit 22-2.
(Ii) After completion of the delay timer count, a contact opening operation signal is output to the semiconductor switch 21.

The circuit breaker _opening operation time T _opening varies depending on the circuit breaker temperature, the circuit breaker operating pressure, the circuit breaker control voltage, the number of circuit breaker operations, and the circuit breaker downtime. Since these data are acquired by the switchgear control / monitoring input / output unit 2, the digital calculation unit in the switchgear control / monitoring calculation unit 1 can perform correction calculation of the _opening operation time Topening.

  Needless to say, the same operation is performed in the synchronous closing control. However, in the synchronous closing control, it is necessary to control based on the zero cross point of the main circuit voltage and to consider the pre-arc characteristic.

As described above, according to the synchronous switching control system using the switching device control / monitoring unit of the present embodiment, the contact of the circuit breaker is opened and closed at a predetermined phase of the main circuit current or the main circuit voltage. The control operation for outputting the timing to be poled is performed only by the logic circuit of the switchgear control / monitoring input / output unit 2 which is hardware. On the other hand, the calculation of the opening operation time / closing operation time and the synchronous opening / closing delay time T _delay for determining the timing is complicated by the digital operation processor (CPU) 11 of the switching device control / monitoring operation unit 1. Simple algorithms can be calculated easily.

  High-precision synchronous opening / closing control can be realized by a combination of the above hardware and software.

The figure explaining the outline | summary of the digitized switchgear protection control system which concerns on Embodiment 1 of this invention. The block diagram which mainly shows the switch control / monitoring arithmetic unit among the switch control / monitoring units for circuit breakers of FIG. FIG. 2 is a configuration diagram centering on a switching device control / monitoring input / output unit of the switching device control / monitoring unit for the circuit breaker of FIG. 1. The detailed block diagram of a circuit breaker drive circuit. The basic flowchart of a circuit breaker drive signal. The figure explaining the outline | summary of the digitized switchgear protection control system which concerns on Embodiment 2 of this invention. The figure which shows the timing chart at the time of the synchronous opening control in the digitized switchgear protection control system of Embodiment 3 of this invention.

Explanation of symbols

A: Switchgear control / monitoring unit, B: Digital instrument transformer unit, 1 ... Switchgear control / monitoring arithmetic unit, 2, 3, 4, 5 ... Switchgear control / monitoring input / output unit, 6 ... Switchgear control Monitoring operation unit communication means, 11 ... digital operation processor, 12 ... switchgear state data storage means, 13 ... I / O communication interface, 14 ... internal bus, 21 ... semiconductor switch, 22-1, 22-2 ... logic circuit , 23 ... Digital input circuit (DI), 24 ... Analog input circuit (AI), 25 ... Digital output circuit (DO), 26 ... Control circuit, 27 ... Current detection resistor, 28 ... Power supply monitoring circuit (PAL), 29 ... Circuit breaker drive circuit (CMU), 102 ... Circuit breaker, 103, 104 ... Disconnector, 105, 106 ... Current transformer, 107 ... Instrument transformer, 108 ... Digital output means (digital converter), 109 ... Communication 110, Process bus (Pro Scan LAN), 111 ... merging unit (MU), 112 ... protective relay unit, 113 ... Bay Control Unit (BCU) 121 ... parallel bus (internal bus), 122 ... process bus communication unit.

Claims (10)

A digital data output means for inputting the main circuit AC electric quantity of the switchgear body and outputting digital data;
Protection control means for inputting digital data output from the digital data output means via communication means for forming an information transmission path, and for monitoring, controlling and protecting the switchgear body,
While receiving a command from this protection control means through the communication means forming the information transmission path, the switchgear control / monitoring unit for monitoring and controlling the switchgear body,
In the switchgear control and monitoring system consisting of
The switchgear control / monitoring unit includes a data collecting means for capturing switchgear status data that is a contact point of sensor data or a contact point such as electrical quantity data and operation status data related to the switchgear, and a switch for the switchgear drive unit. An opening / closing device control / monitoring input / output unit comprising a driving circuit composed of a semiconductor switch for outputting a driving signal, and a logic circuit for controlling an opening / closing timing applied to the semiconductor switch;
A digital arithmetic processor for performing opening / closing control calculation and monitoring calculation of the switchgear, data storage means for storing the switchgear state data transmitted from the switchgear control / monitoring input / output unit, and the communication means A switchgear control / monitoring arithmetic unit equipped with a communication interface;
A switchgear control / monitoring system characterized by comprising:   2. The switchgear control / monitoring system according to claim 1, wherein the communication means is constituted by a process bus as a serial transmission medium.   2. The semiconductor switch according to claim 1, wherein when the switchgear controlled and monitored by the switchgear control / monitoring unit is a circuit breaker, the switchgear includes a semiconductor switch that directly energizes the trip coil of the circuit breaker. Item 3. The switchgear control and monitoring system according to item 2.   A plurality of the semiconductor switches are connected in series to the tripping coil and the input coil, and each semiconductor switch is controlled by a drive signal output from the logic circuit provided individually. The switchgear control / monitoring system according to any one of claims 1 to 3.   5. The switchgear control / monitoring system according to claim 1, wherein the semiconductor switch is constantly monitored and the coil disconnection is monitored by detecting a voltage between terminals of the semiconductor switch.   6. The switchgear control / monitoring system according to claim 1, wherein the logic of the semiconductor switch drive signal output from the individual logic circuit is positive or negative.   The semiconductor switch has a separate semiconductor switch for the protection command and the control command from the protection control means, and the protection semiconductor switch and the control semiconductor switch are arranged in parallel on the drive coil of the circuit breaker. The switchgear control / monitoring system according to claim 1, wherein the switchgear control / monitoring system is connected.   8. The switch control / control device according to claim 1, wherein a current detection resistor is connected in series to the semiconductor switch, and a circuit breaker switching command current is detected by the current detection resistor. Monitoring system. In performing the control to open and close the contactor of the circuit breaker at a predetermined phase of the main circuit current or the main circuit voltage with respect to the protection command from the protection control means or the control command,
The logic circuit of the switchgear control / monitoring input / output unit operates the semiconductor switch by delaying the protection command or the control command by a predetermined time,
2. The predetermined delay time is calculated based on a main circuit current or a main circuit voltage acquired from the digital data output means by a digital arithmetic processor of the switchgear control / monitoring arithmetic unit. The switchgear control / monitoring system according to claim 8. At least one of circuit breaker temperature data, circuit breaker operation pressure data, circuit breaker control voltage data, circuit breaker operation time data, circuit breaker operation times, circuit breaker downtime acquired by the switchgear control / monitoring input / output unit The switchgear control / monitoring system according to claim 1, wherein the delay time is corrected using a switch.

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