JP6834835B2 - Switch batch monitoring device, switch batch monitoring method, and switch batch monitoring program - Google Patents

Description

The present invention relates to a switch batch monitoring device, a switch batch monitoring method, and a switch batch monitoring program.

A plurality of switches (circuit breakers) are provided in the electric station, and it is necessary to monitor whether the switches are operating normally. To monitor the operation of the switch, the waveform of the control current supplied to the switch may be observed. In addition to multiple switches, there are cases where devices other than switches are installed in electrical stations, and these switches and devices are collectively supplied with control current from a common power source. To. Therefore, even when the control current is not supplied to the switch, the control current of the device flows through the bus of the power supply. Therefore, it is difficult to identify the waveform of the current for controlling the switch from the current flowing through the bus of the power supply. In order to solve the problem, Patent Document 1 describes a technique of identifying a waveform of a current for controlling a switch from a current flowing through a bus of a power source and recording the specified waveform.

Japanese Patent No. 4413270

Here, the switch may employ an indirect cutoff method, in which case a seal-in circuit is connected to the switch. In the switch connected to the seal-in circuit, the current from the bus of the power supply is first supplied to the seal-in circuit, and the current supply causes the seal-in circuit to close the contacts of the switch body. When the contacts are closed, a control current is conducted to the switch body from the bus of the power supply, and the switch body opens (cuts off) by the control current. The switch to which the seal-in circuit is connected in this way may have a small current value required for control, and for example, a method such as Patent Document 1 may not be able to specify the waveform of the current for control. In addition, if the waveform specific threshold value is made small so that the waveform can be specified even when the current value for control is small, the waveform is recorded even when a small waveform change occurs when the switch is not operating. Therefore, there is a possibility that the waveform cannot be recorded properly. In addition, the switch connected to the seal-in circuit may have a different current waveform pattern than the switch not connected to the seal-in circuit, and in this case, the waveform may not be properly specified. is there. In this way, when monitoring the operation of a plurality of switches at once, even if a switch connected to the seal-in circuit is provided, it is required to appropriately monitor the operation of the switch. There is.

In order to solve the above problems, the present invention appropriately monitors the operation of a plurality of switches even when the switches connected to the seal-in circuit are provided. It is an object of the present invention to provide a switch batch monitoring device, a switch batch monitoring method, and a switch batch monitoring program to be monitored.

In order to solve the above-mentioned problems and achieve the object, the switch batch monitoring device of the present disclosure includes a plurality of switches having at least one connected to a seal-in circuit, the plurality of switches, and the opening / closing. It is a switch batch monitoring device that collectively monitors the operation of the plurality of switches in an electric station that has a control power supply that supplies the control current supplied to each of the devices other than the device as the main current. The current acquisition unit that acquires the measured value of the main current and the rate of change of the main current increase between the first and second hours, and during the second and third hours. It is determined whether or not the control state is descending and rising again from the third time, and when the control state is determined, the seal-in circuit is connected to the seal-in circuit between the first time and the third time. When the determination unit determines that the main current has been supplied and the determination unit determines that the control state is in effect, waveform processing is executed based on the waveform of the main current from the third time to operate the switch. It has a waveform processing unit for extracting a current waveform for determining a state.

The determination unit determines that the control state is reached when the rate of change of the main current reaches a peak value in the second time, becomes 0 in the third time, and rises again from the third time. Is preferable.

It is preferable that the determination unit determines that the control state is in the control state when the length of the time from the first time to the second time is equal to or less than a predetermined time length threshold value.

It is preferable that the determination unit determines that the control state is in the control state when the maximum value of the rate of change of the main current from the first time to the second time is equal to or greater than a predetermined rate of change threshold.

When the determination unit determines that the control state is determined, the waveform processing unit is based on a waveform obtained by subtracting the current value of the main current in the third time from the waveform of the main current from the third time. It is preferable to perform waveform processing.

The switch batch monitoring device includes a monitoring unit that detects whether the main current acquired by the current acquisition unit is at least a predetermined rate of change, and a monitoring unit that detects that the current is at least a predetermined rate of change. It is preferable that the main current waveform recording unit further includes a main current waveform recording unit for recording the waveform of the main current, and the determination unit determines whether or not the control state is based on the waveform of the main current.

When the main current is supplied, the seal-in circuit closes the contact of the switch connected to the seal-in circuit to supply the main current to the switch to open the switch. It is preferable to make it.

In order to solve the above-mentioned problems and achieve the object, the switch batch monitoring method of the present disclosure includes a plurality of switches having at least one connected to a seal-in circuit, the plurality of switches, and the opening / closing. This is a switch batch monitoring method that collectively monitors the operation of the plurality of switches in an electric station that has a control power supply that supplies the control current supplied to each of the devices other than the device as the main current. The current acquisition step for acquiring the measured value of the main current and the rate of change of the main current increase between the first hour and the second hour, and during the second to third hours. It is determined whether or not the control state is descending and rising again from the third time, and when the control state is determined, the seal-in circuit is connected to the seal-in circuit between the first time and the third time. When it is determined in the determination step that the main current is supplied and the control state is determined in the determination step, waveform processing is executed based on the waveform of the main current from the third time to operate the switch. It has a waveform processing step for extracting a current waveform for determining a state.

In order to solve the above-mentioned problems and achieve the object, the switch batch monitoring program of the present disclosure includes a plurality of switches having at least one connected to a seal-in circuit, the plurality of switches, and the opening / closing. The main trunk is used as an information processing device that collectively monitors the operation of the plurality of switches in an electric station having a control power supply that supplies a control current supplied to each of the devices other than the device as a main current. The current acquisition step of acquiring the measured value of the current and the rate of change of the main current increase during the first to second hours and decrease during the second to third hours. It is determined whether the control state is rising again from the third time, and when the control state is determined, the main current is supplied to the seal-in circuit between the first time and the third time. When the determination step of determining that the switch has been performed and the control state are determined in the determination step, waveform processing is executed based on the waveform of the main current from the third time to determine the operating state of the switch. The waveform processing step of extracting the current waveform for the current is executed.

According to the present invention, when the operation of a plurality of switches is collectively monitored, the operation of the switches can be appropriately monitored even if the switches connected to the seal-in circuit are provided. ..

FIG. 1 is a schematic diagram showing a configuration of a power distribution system according to the present embodiment. FIG. 2 is a graph showing an example of a control current waveform of a switch to which a seal-in circuit is not connected. FIG. 3 is a graph showing an example of a control current waveform of a switch to which a seal-in circuit is connected. FIG. 4 is a schematic block diagram of the switch batch monitoring device according to the present embodiment. FIG. 5 is a graph showing an example of a current waveform extracted by the waveform processing unit. FIG. 6 is a flowchart illustrating a waveform processing flow of the switch batch monitoring device. FIG. 7 is a flowchart illustrating a flow of determining whether or not the waveform of the control current is a waveform of the control current by the control current determination unit. FIG. 8 is a schematic view showing another example of the switch.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the present invention is not limited to this embodiment, and when there are a plurality of embodiments, the present invention also includes a combination of the respective examples.

(Overall configuration of power distribution system)
FIG. 1 is a schematic diagram showing a configuration of a power distribution system according to the present embodiment. As shown in FIG. 1, the distribution system 100 according to the present embodiment includes a DC power supply device 10, a distribution board 12, a distribution board 14, a remote control device 16, a switch 18, and a switch 20. , The device 22, the switch batch monitoring device 24, and the remote monitoring control device 26. The power distribution system 100 collectively supplies control currents from the DC power supply device 10 to the switches 18 and 20 and the device 22 provided on the distribution wires constituting the power system, and supplies the switches 18, 20 and This is a system for operating the device 22. Further, the power distribution system 100 collectively monitors a plurality of switches by recording the waveform of the control current (control current) supplied to the switches 18 and 20 by the switch batch monitoring device 24. In the example of FIG. 1, only two switches 18 and 20 are described in the power distribution system 100, but the number of switches is arbitrary as long as it is plural, and three or more switches are provided. May be good. Further, the device 22 is a device other than a switch (circuit breaker), and although it is one in the example of FIG. 1, a plurality of devices 22 may be provided. In this case, if the device is a device other than a switch (circuit breaker), its function is also arbitrary.

In the power distribution system 100, the DC power supply device 10, the distribution board 12, the distribution board 14, the remote control device 16, the switches 18 and 20, the device 22, and the switch collective monitoring device 24 are electrically connected. A remote monitoring and control device 26 is provided at the control station 120. The electric station 110 is an electric station facility such as a power plant or a substation. Further, the control station 120 is, for example, a power supply station or the like, and is a facility provided at a place away from the electric station 110.

The DC power supply device 10 as a control power source controls the switches and devices (switches 18, 20 and device 22 in the example of FIG. 1) provided in the electric station 110 to control the switches and devices. It is a DC power supply that supplies a control current (control current) and an operating current (operating current) for actually operating those switches and devices. That is, the DC power supply device 10 includes a control power supply that collectively generates a control current to be supplied to each device, and an operation power supply that collectively generates an operation current to be supplied to each device. The control power supply and the operation power supply may be provided in separate DC power supply devices without being limited to the present embodiment.

As shown in FIG. 1, the DC power supply device 10 includes a rectifier 30, a storage battery 32, a supply bus 34, wiring breakers 36, 37, 38, an operation power output terminal 40, and a control power output terminal 42. It has a power supply output terminal 43 and current measuring units S1 and S2. The rectifier 30 is provided on the power supply side of the supply bus 34, and converts an alternating current from an alternating current to a direct current. The storage battery 32 is provided on the power supply side of the supply bus 34 and charges the direct current output from the rectifier 30. The supply bus 34 is an electric wire through which a direct current from the rectifier 30 flows. The molded case circuit breaker 36 is a molded case circuit breaker (MCCB) provided on the wiring connecting the rectifier 30 and the supply bus 34.

The molded case circuit breaker 37 is a molded case circuit breaker provided on the wiring connecting the supply bus 34 and the operation power output terminal 40. The wiring breaker 37 branches a part of the direct current supplied to the supply bus 34 and supplies it to the operation power supply output terminal 40 as the main current I2. The operation power output terminal 40 is connected to the supply bus 34 via a wiring breaker 37, and the main current I2 is input. The operation power output terminal 40 outputs the main current I2 to the distribution board 12. The main current I2 includes the operating currents for the switches 18, 20 and the device 22. That is, the switches 18 and 20 and the device 22 acquire the current branched from the main current I2 as their respective operating currents. In other words, the DC power supply device 10 collectively supplies the operating current of each device as the main current I2. The maximum value of the main current I2 is larger than that of the main current I1 described later.

The molded case circuit breaker 38 is a molded case circuit breaker provided on the wiring connecting the supply bus 34 and the control power output terminal 42. The wiring breaker 38 branches a part of the DC current supplied to the supply bus 34 and supplies it to the control power output terminal 42 as the main current I1. The control power output terminal 42 is connected to the supply bus 34 via a wiring breaker 38, and the main current I1 is input. The control power output terminal 42 outputs the main current I1 to the distribution board 14. The main current I1 includes control currents for switches 18, 20 and equipment 22. That is, the switches 18 and 20 and the device 22 acquire the current branched from the main current I1 as their respective control currents. In other words, the DC power supply device 10 collectively supplies the control current of each device as the main current I1.

The power output terminal 43 is connected to the supply bus 34 via a molded case circuit breaker. The power output terminal 43 is a spare output terminal, and may be one or a plurality of the power output terminals 43, and although they are unused, they may be used (connected to other equipment) as needed.

The current measuring unit S1 is provided on the wiring connecting the supply bus 34 and the control power output terminal 42, and is provided between the wiring breaker 38 and the control power output terminal 42. The current measuring unit S1 is a sensor that measures the main current I1, and is a clamp type current transformer in this embodiment. The current measuring unit S1 measures the current value of the main current I1 at predetermined time intervals. The current measuring unit S1 transmits the measured value (measurement data) of the main current I1 to the switch batch monitoring device 24. The current measuring unit S1 is provided on the upstream side of the distribution board 14 and measures the main current I1 before branching to the control currents of the switches 18, 20 and the device 22 by the distribution board 14. If so, the installation position and the current measurement method are arbitrary.

The current measuring unit S2 is provided on the wiring connecting the supply bus 34 and the operating power output terminal 40, and is provided between the molded case circuit breaker 37 and the operating power output terminal 40. The current measuring unit S2 is a sensor that measures the main current I2, and is a clamp type current transformer in this embodiment. The current measuring unit S2 measures the current value of the main current I2 at predetermined time intervals. The current measuring unit S2 transmits the measured value (measurement data) of the main current I2 to the switch batch monitoring device 24. The current measuring unit S2 is provided on the upstream side of the distribution board 12 and measures the main current I2 before branching to the operating currents of the switches 18, 20 and the device 22 by the distribution board 12. If so, the installation position and the current measurement method are arbitrary.

The distribution board 12 is a power receiving facility that distributes the main current I2 supplied via the operating power output terminal 40 of the DC power supply device 10 to each device (switches 18, 20 and device 22) as an operating current. The distribution board 12 has an operating power supply bus 46, an operating power input terminal 48, and an operating power output terminal 49. The operating power input terminal 48 is connected to the operating power output terminal 40 of the DC power supply device 10, and the main current I2 is input from the operating power output terminal 40. The operating power bus 46 is a distribution line connected to the operating power input terminal 48. The operating power bus 46 branches (distributes) the main current I2 from the operating power input terminal 48 into a plurality of operating currents for each device. A plurality of operation power output terminals 49 are provided, and each of them is connected to the operation power bus 46. The operating current branched from the main current I2 is input to the operating power output terminal 49, respectively. One of the operating power output terminals 49 is connected to the closing circuit 73 of the switch 18 described later via the operating distribution line P0, and outputs the operating current to the closing circuit 73 via the operating distribution line P0. .. Although not shown, the other operating power output terminals 49 are connected to devices other than the switch 18 (switch 20 and device 22), and supply operating current to each of them.

The distribution board 14 is a power receiving facility that distributes the main current I1 supplied via the control power output terminal 42 of the DC power supply device 10 to each device (switches 18, 20 and device 22) as a control current. The distribution board 14 has a control power supply bus 50, a control power supply input terminal 52, and a control power supply output terminal 54. The control power input terminal 52 is connected to the control power output terminal 42 of the DC power supply device 10, and the main current I1 is input from the control power output terminal 42. The control power bus 50 is a distribution line connected to the control power input terminal 52. The control power supply bus 50 branches (distributes) the main current I1 from the control power supply input terminal 52 into a plurality of control currents for each device. A plurality of control power output terminals 54 are provided, and each of them is connected to the control power bus 50. The control current branched from the main current I1 is input to the control power output terminal 54, respectively. One of the control power output terminals 54 is connected to the on-off control circuit 70, the trip circuit 71, and the seal-in circuit 72 of the switch 18 described later via the control distribution line P1, and is connected to the control distribution line P1. Then, the control current is output to each of those circuits. Although not shown, the other control power output terminals 54 are connected to devices other than the switch 18 (switch 20 and device 22), and supply a control current to each of them.

The remote control device 16 is a remote control device, is communicably connected to the remote monitoring control device 26, and functions as a slave station of the remote monitoring control device 26. Specifically, the remote control device 16 receives an input command or a trip command from the remote monitoring control device 26 toward a plurality of switches including the switch 18 by a predetermined transmission procedure, and sends each command. It has a function of transmitting the corresponding signal to the switch. As a predetermined transmission procedure, a CDT (Cyclic Data Transfer) method for transmitting and receiving information at regular intervals, an HDLC (High level Data Link Control) method for transmitting and receiving each time event information is generated, and the like are adopted.

The remote control device 16 includes a power input terminal 56, a control relay 58, a selection relay 60, an on command output terminal 62, a control relay 64, a selection relay 66, and a trip command output terminal 68. Has.

The power input terminal 56 is connected to one of the control power output terminals 54 of the distribution board 14. The control relay 58 is excited when any one switch among the plurality of switches is turned on (closed) based on the closing command received from the remote monitoring control device 26. A plurality of selection relays 60 are provided, and a switch that performs a closing operation (closing operation) is selected among the plurality of switches based on a closing command received from the remote monitoring control device 26. The closing command output terminal 62 is provided so as to correspond to each of the plurality of selection relays 60, and outputs a closing command (closing operation command) to the closing control circuit 70 of the switch selected by the selection relay 60. .. The control relay 58 and the plurality of selection relays 60 have a main contact and an auxiliary contact that are closed in conjunction with each other when the corresponding relay is excited.

The control relay 64 is excited when shutting off (opening) any one of the switches among the plurality of switches based on the trip command received from the remote monitoring control device 26. A plurality of selection relays 66 are provided, and a switch that performs a tripping operation (opening operation) is selected among the plurality of switches based on a tripping command received from the remote monitoring control device 26. The trip command output terminal 68 is provided in association with each of the plurality of selection relays 66, and issues a trip command (close operation command) toward the switch trip circuit 71 selected by the selection relay 66. Output. The control relay 64 and the plurality of selection relays 66 have a main contact and an auxiliary contact that are closed in conjunction with each other when the corresponding relay is excited.

The switch 18 is a switch that switches the current flowing through the electric line (transmission line or distribution line) for high voltage and extra high voltage, and is of a type such as a vacuum circuit breaker, a gas circuit breaker, an air circuit breaker, and a magnetic circuit breaker. There is. The switch 18 is an indirect cutoff type switch to which the seal-in circuit 72 is connected. The switch 18 has a closing control circuit 70, a tripping circuit 71, a seal-in circuit 72, and a closing circuit 73. The ON control circuit 70, the trip circuit 71, and the seal-in circuit 72 are connected in parallel to the control distribution line P1 and operate by the control current supplied from the distribution board 14 to the control distribution line P1. .. The input circuit 73 is connected to the operation distribution line P0 and operates by the operation current supplied from the distribution board 12 to the operation distribution line P0. Therefore, the switch 18 has two power supply systems.

The closing control circuit 70 is a circuit for controlling a closing operation (closing operation). The closing control circuit 70 has a contact 70A, a closing lock terminal 70B, a circuit breaker closing control coil 70C, and a contact 70D. The contact 70A is a contact arranged on the most control distribution line P1 side of the closing control circuit 70. The closing lock terminal 70B is connected in series with the contact 70A and is arranged on the side opposite to the control distribution line P1 from the contact 70A. The circuit breaker closing control coil 70C is connected in series to the contact 70A and the closing lock terminal 70B, and is arranged on the opposite side of the closing lock terminal 70B to the control distribution line P1. The contact 70D is connected in series to the contact 70A, the closing lock terminal 70B, and the circuit breaker closing control coil 70C, and is arranged on the side opposite to the control distribution line P1 from the circuit breaker closing control coil 70C. Further, a wiring from the closing command output terminal 62 of the remote control device 16 is connected between the contact 70A and the closing lock terminal 70B. However, the above configuration of the closing control circuit 70 is an example, and any circuit that can control the closing operation (closing operation) may be used. For example, the closing lock terminal 70B may not be provided, and for example, the wiring from the closing command output terminal 62 of the remote control device 16 is connected between the closing lock terminal 70B and the circuit breaker closing control coil 70C. You may be.

The trip circuit 71 is a circuit for performing a trip operation (open operation). The trip circuit 71 has contacts 71A1 and 71A2, a trip lock terminal 71B, a circuit breaker trip coil 71C, and a contact 71D. The contact 71A1 is a contact arranged on the most control distribution line P1 side of the trip circuit 71. The contact 71A2 is connected in series with the contact 71A1 and is arranged on the side opposite to the control distribution line P1 with respect to the contact 71A1. The trip lock terminal 71B is connected in series to the contacts 71A1 and 71A2, and is arranged on the side opposite to the control distribution line P1 from the contact 71A2. The circuit breaker trip coil 71C is connected in series to the contacts 71A1 and 71A2 and the trip lock terminal 71B, and is arranged on the side opposite to the control distribution line P1 from the trip lock terminal 71B. The contact 71D is connected in series with the contacts 71A1 and 71A2, the trip lock terminal 71B, and the circuit breaker trip coil 71C, and is arranged on the side opposite to the control distribution line P1 from the circuit breaker trip coil 71C. Further, a wiring from the trip command output terminal 68 of the distance control device 16 is connected between the contact 71A2 and the trip lock terminal 71B. However, the above configuration of the trip circuit 71 is an example, and any circuit that can perform the trip operation (open operation) may be used. For example, the wiring from the trip lock terminal 68 of the remote control device 16 may be connected between the trip lock terminal 71B and the circuit breaker trip coil 71C.

The seal-in circuit 72 is a circuit for closing the contacts 71A1 and 71A2 of the trip circuit 71 and causing the trip circuit 71 to perform the trip operation. The seal-in circuit 72 has contacts 72X1, 72X2, 72Y1, 72Y2, relays 72A1, 72A2, 72B1, 72B2, a trip lock terminal 72D, and contacts 72E. The contact 72X1 is a contact arranged on the most control distribution line P1 side of the seal-in circuit 72. The contact 72X2 is connected in series with the contact 72X1 and is arranged on the side opposite to the control distribution line P1 with respect to the contact 72X1. The contact 72X2 is a fail-safe contact of the contact 72X1. The contact 72Y1 is a contact connected to the control distribution line P1 in parallel with the contacts 72X1 and 72X2. The contact 72Y2 is connected in series with the contact 72Y1 and is arranged on the side opposite to the control distribution line P1 from the contact 72Y1. That is, the contacts 72Y1 and 72Y2 are connected in parallel with the contacts 72X1 and 72X2. The relay 72A1 is connected in series to the contacts 72X1, 72X2 and the contacts 72Y1 and 72Y2, and is arranged on the side opposite to the control distribution line P1 from the contacts 72X2 and 72Y2. The relay 72A2 is arranged on the side opposite to the control distribution line P1 with respect to the coil 72A1 and is connected in series with the relay 72A1. The trip lock terminal 72D is arranged on the side opposite to the control distribution line P1 with respect to the coil 72A2, and is connected in series with the coil 72A2. The contact 72E is arranged on the side opposite to the control distribution line P1 with respect to the trip lock terminal 72D, and is connected in series with the trip lock terminal 72D. The relay 72B1 and the relay 72B2 are connected in series. The relay 72B1 and the relay 72B2 are not electrically connected to the circuit to which the relays 72A1 and 72A2 are connected, and are excited by the excitation of the relays 72A1 and 72A2.

The closing circuit 73 is a circuit for actually performing a closing operation (closing operation). The closing circuit 73 is connected to the operation distribution line P0 and has a contact 73A and a closing coil 73C. The contact 73A is a contact arranged on the most operating distribution line P0 side of the input circuit 73. The input coil 73C is connected in series with the contact 73A and is arranged on the side opposite to the operation distribution line P0 from the contact 73A. However, the above configuration of the closing circuit 73 is an example, and any circuit that can perform the closing operation (closing operation) may be used.

The switch 20 is a switch that does not have the seal-in circuit 72, unlike the switch 18. The switch 20 has a closing control circuit 70, a trip circuit 71, and a closing circuit 73. For example, the contacts 71A1 and 71A2 of the trip circuit 71 can be manually opened and closed. .. The switch 20 is connected to an operation distribution line P0 and a control distribution line P1 which are different from the switch 18. As described above, the power distribution system 100 includes a switch 18 having a seal-in circuit 72 and a switch 20 having no seal-in circuit 72. However, the power distribution system 100 includes a plurality of switches, and the number of switches is arbitrary as long as at least one of the switches has a seal-in circuit 72.

The device 22 is a device other than the switch, and is connected to an operation distribution line P0 and a control distribution line P1 which are different from the switches 18 and 20. The device 22 performs a predetermined operation by constantly inputting a constant control current.

The switch batch monitoring device 24 is a device that collectively monitors the operation of each switch (switches 18 and 20 in the example of FIG. 1). The switch batch monitoring device 24 monitors the operation of the switch by recording the waveform of the control current based on the measured values of the main currents I1 and I2 measured by the current measuring units S1 and S2. Since the main current I1 is a collective current before the control currents of each switch and the device are branched, the operation of all switches can be collectively performed by measuring and recording the waveform of the main current I1. Can be monitored. The configuration of the switch batch monitoring device 24 will be described later.

The power distribution system 100 has a configuration as described above.

(Switch operation)
Next, the closing operation (closing operation) and the pulling operation (opening operation) of the switch 18 will be described. First, the closing operation will be described. The switch 18 performs a closing operation (closing operation) when a control current is input to the closing control circuit 70. In the closing control circuit 70, for example, when the contact 70A is manually closed, the control current from the control distribution line P1 is supplied to the circuit breaker closing control coil 70C. The circuit breaker closing control coil 70C is excited when a control current is supplied, and closes the contact 73A of the closing circuit 73. In the closing circuit 73, when the contact 73A is closed, the closing current is supplied to the closing coil 73C. The closing coil 73C is excited by the closing current and transmits a driving force to a link mechanism (not shown) of the switch 18. Further, the switch 18 is provided with a blocking portion (not shown), and the blocking portion is provided with a movable contact and a fixed contact in an insulating case. The link mechanism transmits the driving force from the closing coil 73C to the movable contactor of the blocking portion via an insulating operation rod (not shown) or the like to bring the movable contactor into contact with the fixed contactor. As a result, the switch 18 is put into the turned-on (closed) state. Further, when the closing current is input from the closing command output terminal 62 of the remote control device 16, the closing control circuit 70 also inputs the current to the circuit breaker closing control coil 70C, and the closing circuit 73 By closing the contact 73A of the above, a closing operation (closing operation) is performed. When the closing operation is completed, the contact 70D is opened and the input of the current to the circuit breaker closing control coil 70C is stopped.

Next, the pulling operation will be described. When the control current is input to the seal-in circuit 72, the switch 18 closes the contacts 71A1 and 71A2 of the trip circuit 71, and causes the trip circuit 71 to perform the trip operation (open operation). The seal-in circuit 72 automatically closes the contacts 72X1 and 72X2 when an abnormality such as a ground fault or a short circuit is detected. As a result, the control current from the control distribution line P1 is input to the seal-in circuit 72. The seal-in circuit 72 is brought into a self-holding state by closing the contacts 72Y1 and 72Y2. When the contacts 72X1 and 72X2 or the contacts 72Y1 and 72Y2 are closed, the control current from the control distribution line P1 is input to the relays 72A1 and 72A2. The coils of the relays 72A1 and 72A2 are excited by the control current to close the contacts 71A1 and 71A2 of the trip circuit 71.

In the trip circuit 71, when the contacts 71A1 and 71A2 are closed, the control current from the control distribution line P1 is supplied to the circuit breaker trip coil 71C. The circuit breaker trip coil 71C is excited when a control current is supplied, and transmits a driving force to the link mechanism of the switch 18. The link mechanism transmits the driving force from the circuit breaker trip coil 71C to the movable contact of the circuit breaker via an insulating operation rod or the like, and separates the movable contact from the fixed contact. As a result, the switch 18 is in a detached (open) state. Further, the trip circuit 71 also inputs a current to the circuit breaker trip coil 71C when a current for trip is input from the trip command output terminal 68 of the remote control device 16, and links the circuit breaker 71. By transmitting the driving force to the mechanism, the pulling operation (opening operation) is performed. When the tripping operation is completed, the contact 71D opens and the input of the current to the circuit breaker tripping coil 71C is stopped. In this way, the seal-in circuit 72 closes the contacts 71A1 and 71A2 of the switch 18 (removal circuit 71) connected to the seal-in circuit 72 when the main current I1 is supplied as the control current. , The main current I1 is supplied to the switch 18 (the circuit breaker trip coil 71C) to open the switch 18.

(Control current waveform)
Next, the waveform of the control current will be described. In the power distribution system 100, the switch batch monitoring device 24 records the waveform of the control current. Specifically, the switch batch monitoring device 24 records the waveform of the main current I1 measured by the current measuring unit S1. As described above, since the main current I1 is the current before the control current is branched, the waveform of the control current can be extracted from the waveform of the main current I1.

When the switches 18 and 20 are not operating, only the control current of the device 22 is flowing as the main current I1. Since the control current of the device 22 is a steady current with little change by a constant amount at all times, when the switches 18 and 20 are not operating, the main current I1 becomes a waveform of a steady current with little change. On the other hand, when the switches 18 and 20 are in the closing operation or the pulling operation, the control current flows through the switches 18 and 20, so that the waveform of the main current I1 is the amount of the control current of the switches 18 and 20. It changes a lot. When the waveform of the main current I1 changes in this way, the switch batch monitoring device 24 determines that the waveform of the control current may be flowing through the switches 18 and 20, and determines that the waveform of the main current I1 is flowing. Record the waveform.

Here, the switch 18 is connected to the seal-in circuit 72. The inventor has discovered that the waveform of the control current during the tripping operation of the switch 18 to which the seal-in circuit 72 is connected is different from the waveform of the control current during the tripping operation of the switch 20. If the waveforms are different in this way, it becomes difficult to extract and record the waveform of the control current of the switch 18. On the other hand, the inventor recalled a method of appropriately recording the waveform of the control current of the switch 18 to which the seal-in circuit 72 is connected. The difference in waveform will be described below.

FIG. 2 is a graph showing an example of a control current waveform of a switch to which a seal-in circuit is not connected. More specifically, FIG. 2 shows the waveform of the main current I1 when the switch 20 is being pulled off. The horizontal axis of FIG. 2 is time, the left side of the vertical axis is the current (A), and the right side of the vertical axis is the rate of change (%) of the current. The line segment L1 in FIG. 2 shows the value of the main current I1 for each hour, and the line segment L2 in FIG. 2 shows the rate of change of the main current I1 for each hour. The rate of change shown in the line segment L2 is a value calculated by a moving average of a plurality of sampling points (here, 5 samplings). The rate of change here is the ratio of the difference value of the measured value of the main current I1 to the measured value of the main current I1 measured by the current measuring unit S1 at the immediately preceding timing.

As shown in FIG. 2, before the time t1, the main current I1 is a steady current whose rate of change is close to zero. That is, before the time t1, the switch 20 is not operating and the control current is supplied only to the device 22. From time t1 to time t2, the value of the main current I1 increases while the rate of change of the current increases with the passage of time. Then, from time t2 to time t3, the rate of change of the current decreases with the passage of time, but even at time t3, the rate of change of the current is larger than 0. Therefore, from time t2 to time t3, the value of the main current I1 continues to increase with the passage of time, but the rate of increase is smaller than that from time t1 to time t2. From time t3 to time t4, the value of the main current I1 rises while the rate of change of the current rises again with the passage of time. Further, from time t4 to time t5, the rate of change of the current decreases with the passage of time, and the rate of change of the current becomes 0 at time t5. Therefore, from time t4 to time t5, the value of the main current I1 continues to increase with the passage of time, but the rate of increase is smaller than that from time t3 to time t4. From time t5 to time t6, the rate of change of the current decreases from 0 with the passage of time, and the value of the main current I1 decreases. However, even at time t6, the value of the main current I1 is larger than the value at the steady current (before time t1). From the time t6 to the time t7, the rate of change of the current increases from minus and becomes 0 at the time t7. From time t6 to time t7, the main current I1 continues to decrease, but is smaller than the rate of decrease from time t5 to time t6. Then, the main current I1 becomes the value of the steady current at time t7. After the time t7, the rate of change of the current remains close to 0, and the main current I1 also remains the steady current.

In FIG. 2, the supply of the control current to the switch 20 (removal circuit 71) is started at the time t1, and the trip operation of the switch 20 is completed at the time t5. Then, after the time t5, the control current decreases due to the arc resistance of the contact of the trip circuit 71, and the supply of the control current to the switch 20 (the trip circuit 71) ends at the time t7. When the waveform of the main current I1 is such a waveform, the switch batch monitoring device 24 starts supplying the control current for the tripping operation to the switch 20 during the period from time t1 to time t5. After that, it is determined that it is the switch operation time until the switch 20 operates and the operation of the switch 20 is completed. That is, in the case of such a waveform, the switch batch monitoring device 24 starts supplying the control current to the switch 20 (pulling circuit 71) from time t1, and the operation of the switch 20 ends at time t5. Judge.

Further, referring to the line segment L1, it can be seen that the peak value (relative current waveform obtained by subtracting the steady current) between the time t1 and the time t7 of the main current I1 is 1 A or more (usually about 5 A). (First characteristic). Further, it can be seen that the time length in which the main current I1 becomes the control current waveform of the switch 20, that is, the length from the time t1 to the time t5 is relatively short (for example, less than 1 second) (second). Characteristic). Further, it can be seen that the main current I1 rises with the time constant of L / R at the same time when the circuit breaker pulling operation is started as in the time between time t1 and time t5 (third characteristic). Further, it can be seen that the main current I1 suddenly decreases due to the arc resistance at the end of the operation, such as between the time t5 and the time t7 (fourth characteristic). Further, as shown in the vicinity of time t3, it can be seen that when the main current I1 rises with a time constant, the rate of change (rate of rise) of the current changes once (fifth characteristic). Then, it can be seen that the rate of change of the current takes a total of two positive peak values at the time t2 and the time t4.

FIG. 3 is a graph showing an example of a control current waveform of a switch to which a seal-in circuit is connected. More specifically, FIG. 3 shows the waveform of the main current I1 when the switch 18 is being pulled off. The line segment L3 in FIG. 3 shows the value of the main current I1 for each hour, and the line segment L4 shows the rate of change of the main current I1 for each hour. The rate of change shown in the line segment L4 is a value calculated by a moving average of a plurality of sampling points (here, 5 samplings).

As shown in FIG. 3, before the time t11 (first time), the main current I1 is a steady current (current value B1) whose rate of change is close to zero. That is, before the time t11, the switch 18 is not operating, and the control current is supplied only to the device 22. From the time t11 to the time t11A (second time), the value of the main current I1 increases while the rate of change of the current increases with the passage of time. Then, from the time t11A to the time t11B (third time), the rate of change of the current decreases to 0, and remains 0 until the time t11B. Therefore, from the time t11 to the time t11B, the value of the main current I1 rises slightly and then becomes constant. The current value B2 at the time t11B is larger than the current value B1.

As shown in FIG. 3, the waveform of the rate of change of the current after the time t11B has the same tendency as the waveform of the rate of change of the current after the time t1 shown in FIG. That is, from the time t11B to the time t12, the value of the main current I1 increases from the current value B1 while the rate of change of the current increases with the passage of time. Then, from time t12 to time t13, the rate of change of the current decreases with the passage of time, but even at time t13, the rate of change of the current is larger than 0. From time t12 to time t13, the value of the main current I1 continues to increase with the passage of time, but the rate of increase is smaller than that from time t11 to time t12. From time t13 to time t14, the value of the main current I1 rises while the rate of change of the current rises again with the passage of time. Further, from the time t14 to the time t15, the rate of change of the current decreases with the passage of time, and the rate of change of the current becomes 0 at the time t15. Therefore, from time t14 to time t15, the value of the main current I1 continues to increase with the passage of time, but the rate of increase is smaller than that from time t13 to time t14. From time t15 to time t16, the rate of change of the current decreases from 0 with the passage of time, and the value of the main current I1 decreases. However, even at the time t16, the value of the main current I1 is larger than the value at the steady current (before the time t11). From the time t16 to the time t17, the rate of change of the current increases from minus and becomes 0 at the time t17. From time t16 to time t17, the main current I1 continues to decrease, but is smaller than the rate of decrease from time t15 to time t16. Then, the main current I1 becomes the value of the steady current at time t17. After the time t17, the rate of change of the current remains close to 0, and the main current I1 also remains the steady current.

In FIG. 3, the supply of the control current to the seal-in circuit 72 starts at the time t11, the current value gradually increases, and the supply of the control current in the seal-in circuit 72 becomes a steady state at the time t11A. Then, the supply of the control current to the switch 18 (removal circuit 71) starts at time t11B, and the operation of the switch 18 is completed at time t15. Then, after the time t15, the control current decreases due to the arc resistance of the contacts, and the supply of the control current to the trip circuit 71 and the seal-in circuit 72 ends at the time t17. In this way, when the switch 18 is operating, the rate of change of the main current I1 can take a total of three positive peak values at time t11A (second time), time t12, and time t14. I understand. In other words, when the switch 18 performs the tripping operation, the rate of change of the main current I1 increases between the time t11 (first time) and the time t11A (second time), and reaches the peak value at the time t11A. Become. Then, the rate of change of the main current I1 decreases between the time t11A (second time) and the time t11B (third time), and becomes 0 at the time t11B. Then, the rate of change of the main current I1 rises again from the time t11B.

That is, the main current I1 when the control current flows through the switch 18 has one peak in the rate of change of the main current I1 at the start of operation of the seal-in circuit 72 from the time t11 to the time t11B. In that respect, it is different from the main current I1 when the control current flows through the switch 20. The time during which the switch 18 is in the tripping operation (switch operating time) is actually between the times t11B and t15. The peak value of the control current of the trip circuit 71 is a value obtained by subtracting the current value B2 at the time t11B from the current value B3 which is the maximum value of the main current I1 at the time t15. However, for example, consider a case where it is determined that the switch 18 has started the tripping operation when the main current I1 starts to rise from the steady current, and the waveform analysis of the main current I1 is performed. In this case, since the rate of change has increased from time t11, it may be determined that the tripping operation has started from time t11, and an erroneous analysis may be performed if the switch operation time is from time t11 to time t15. is there. Further, the peak value of the main current I1 may be determined to be a value obtained by subtracting the current value B1 (steady current value) at time t11 from the current value B3, and an erroneous analysis may be performed.

On the other hand, in the case of the waveform shown in FIG. 3, the switch batch monitoring device 24 supplies the control current to the seal-in circuit 72 during the time from t11 to t11B, and the control current is supplied to the trip circuit 71. Is not supplied, it is determined that the seal-in circuit continuity time. The seal-in circuit continuity time is the time during which the switch 18 is not in the tripping operation. Furthermore, when the switch batch monitoring device 24 determines that the rate of change of the main current I1 has one peak in the seal-in circuit continuity time, the main current from the time t11A (second time) Waveform processing is executed based on the waveform of I1, and the waveform of the control current of the switch 18 for determining the operating state of the switch 18 is extracted. Hereinafter, the configuration of the switch batch monitoring device 24 will be described. The switch batch monitoring device 24 may determine that the time t11B to t15 is the switch operating time during which the control current is supplied to the trip circuit 71 to perform the switch operation.

(About switch batch monitoring device)
FIG. 4 is a schematic block diagram of the switch batch monitoring device according to the present embodiment. As shown in FIG. 4, the switch batch monitoring device 24 is a computer (information processing device) having a control unit 80 which is a CPU (Central Processing Unit), an input unit 82, an output unit 84, and a storage unit 86. Is. The input unit 82 is, for example, a mouse, a keyboard, or a touch panel, and receives input from an operator. The output unit 84 is, for example, a display unit of a display or a touch panel, and outputs (displays) various information. The storage unit 86 is a memory. The control unit 80 includes a current acquisition unit 90, a sampling unit 92, a monitoring unit 93, a main current waveform recording unit 94, a determination unit 96, a waveform processing unit 98, and a control current determination unit 99. The current acquisition unit 90, the sampling unit 92, the monitoring unit 93, the main current waveform recording unit 94, the determination unit 96, the waveform processing unit 98, and the control current determination unit 99 are opened and closed stored by the storage unit 86. It is a software program realized by the control unit 80 by reading the device batch monitoring program, but it may be, for example, a dedicated device that executes each function.

The current acquisition unit 90 acquires the measured value of the main current I1 from the current measuring unit S1 and acquires the measured value of the main current I2 from the current measuring unit S2.

The sampling unit 92 samples the measured values of the main currents I1 and I2 acquired by the current acquisition unit 90 for each hour and stores them in the storage unit 86.

The monitoring unit 93 monitors the measured values of the main currents I1 and I2 sampled by the sampling unit 92. The monitoring unit 93 determines whether the main current I1 has changed (increased) at a rate of change equal to or higher than a predetermined rate of change K1. When the rate of change of the main current I1 is equal to or higher than the rate of change K1, the monitoring unit 93 causes the main current waveform recording unit 94 to record the waveform of the main current I1. The rate of change K1 is the rate of change of the rising edge when the control current is supplied to the trip circuit 71 of the switch 20 (the rate of change from the time t1 in the example of FIG. 2), and the seal-in circuit 72 of the switch 18. It is set as a value smaller than the rate of change of the rising edge when the control current is supplied to (the rate of change from the time t11 in the example of FIG. 3). Further, the rate of change K1 is a value larger than the minute rate of change in the example steady current in which the control current is supplied to the device 22 but the control current is not supplied to the switch.

The main current waveform recording unit 94 uses the monitoring unit 93 as a trigger to determine that the rate of change of the main current I1 is equal to or greater than the rate of change K1, and triggers the waveform of the main current I1 for a predetermined time (for example, 1 second). Generate and record. The main current waveform recording unit 94 also generates and records waveforms for a predetermined time of the rate of change of the main current I1. The waveform of the main current I1 recorded by the main current waveform recording unit 94 corresponds to, for example, the line segment L3 shown in FIG. Further, the waveform of the rate of change of the main current I1 recorded by the main current waveform recording unit 94 corresponds to, for example, the line segment L4 shown in FIG.

The determination unit 96 reads out the waveform of the rate of change of the main current I1 recorded by the main current waveform recording unit 94. The determination unit 96 determines whether the rate of change of the main current I1 is in the control state based on the waveform of the rate of change of the main current I1. In the determination unit 96, the rate of change of the main current I1 increases from the first hour to the second hour, decreases from the second hour to the third hour, and increases again from the third hour. In this case, it is determined that the control state is in effect. The first time, the second time, and the third time are the times in the waveform recorded by the main current waveform recording unit 94, the second time is the time after the first time, and the third time is. It is the time after the second hour. The first time corresponds to, for example, time t11 shown in FIG. 3, the second time corresponds to, for example, time t11A, and the third time corresponds to, for example, time t11B.

When the determination unit 96 determines that the rate of change of the main current I1 is in the control state, the main current I1 (control current) is supplied to the seal-in circuit 72 between the first time and the third time. Judge. Further, the determination unit 96 may determine that the main current I1 has been supplied as the control current to the trip circuit 71 of the switch 18 from the third hour. That is, when the determination unit 96 determines that the control state is in effect, the waveform of the main current I1 from the first time to the third time includes the waveform when the control current is supplied to the seal-in circuit 72. Judge.

Hereinafter, the method for determining the control state will be described in more detail. The determination unit 96 determines that the control state is in effect when the rate of change of the main current I1 reaches a peak value in the second time, becomes 0 in the third time, and rises again from the third time. Further, the determination unit 96 controls when the length from the first time to the second time (the length from the time t11 to the time t11A in the example of FIG. 3) is equal to or less than the predetermined time length threshold value K2. Judge that it is in a state. Further, in the determination unit 96, the maximum value of the change rate of the main current I1 from the first time to the second time, that is, the peak value in the second time (change rate A1 in the example of FIG. 3) is a predetermined change rate threshold value. When it is K3 or more, it is determined that it is in the control state.

The time length threshold value K2 and the rate of change threshold value K3 are preset and stored in the storage unit 86. The time length threshold value K2 and the rate of change threshold value K3 are set based on, for example, the performance of the seal-in circuit 72 of the switch 18. The time length threshold value K2 and the rate of change threshold value K3 may be set in advance by the determination unit 96 or may be set by the operator. The time length threshold value K2 is, for example, 5 milliseconds, and is preferably 2 milliseconds or more and 5 milliseconds or less. The rate of change threshold K3 is, for example, 10%, preferably 5% or more and 20% or less.

When there are a plurality of switches 18 with seal-in circuits 72, the time length threshold value K2 and the rate of change threshold value K3 are set based on the performance of the seal-in circuits 72 of the respective switches 18. The time length threshold value K2 and the rate of change threshold value K3 are set as common values even when there are a plurality of switches 18. However, the time length threshold value K2 and the rate of change threshold value K3 may be set for each switch 18. In this case, the determination unit 96 determines that the control state is based on the time length threshold value K2 and the change rate threshold value K3 of a certain switch 18, and sets the time length threshold value K2 and the change rate threshold value K3 of another switch 18 to the control state. Based on this, it is possible to determine that the control state is not met. In that case, it is possible to determine that a control current has flowed through the switch 18 determined to be in the control state, and it is possible to determine which switch 18 is performing the tripping operation simply by sampling the main current I1. It becomes possible.

When the determination unit 96 determines that the control state is in control, the waveform processing unit 98 executes waveform processing based on the waveform of the main current I1 from the third time. That is, when the determination unit 96 is in the control state, the current is supplied only to the seal-in circuit 72 until the third time, and the tripping operation is started from the third time (controlled by the trip circuit 71). It is judged that there is a possibility (current has begun to flow). Therefore, the waveform processing unit 98 performs waveform processing for determining the operating state of the switch 18 by using the waveform of the main current I1 from the third time, excluding the waveforms up to the third time. Specifically, as waveform processing, the waveform processing unit 98 sets the switch 18 from the waveform of the main current I1 after the third hour excluding the waveforms of the first to third hours from the waveform of the main current I1. Extract the current waveform to determine the operating state of. More specifically, the waveform processing unit 98 uses a waveform obtained by subtracting the current value of the main current in the third time (current value B2 in the example of FIG. 3) from the waveform of the main current I1 after the third time as a current waveform. Extract. That is, the current waveform extracted by the waveform processing unit 98 is a waveform extracted from the waveform of the main current I1 after the third time. Further, the current waveform extracted by the waveform processing unit 98 has a current value obtained by subtracting the current value of the main current I1 in the third time (current value B2 in the example of FIG. 3) from the measured value of the main current I1. ..

FIG. 5 is a graph showing an example of a current waveform extracted by the waveform processing unit. As shown in the line segment L3A of FIG. 5, the current waveform extracted by the waveform processing unit 98 is a waveform from the third time (time t11A) with respect to the line segment L3 which is the waveform of the main current I1 shown in FIG. Yes, the current value is the value obtained by subtracting the current value B2 in FIG.

Based on the current waveform extracted by the waveform processing unit 98, the control current determination unit 99 shown in FIG. 4 determines whether the current waveform is the waveform of the control current of the switch 18 in more detail, the tripping operation of the switch 18. It is judged whether it is the waveform of the control current at the time of performing. The determination method by the control current determination unit 99 will be described later.

The switch batch monitoring device 24 has the above configuration. Next, the waveform processing flow by the switch batch monitoring device will be described based on the flowchart. FIG. 6 is a flowchart illustrating a waveform processing flow of the switch batch monitoring device. As shown in FIG. 6, first, the switch batch monitoring device 24 reads the threshold value from the storage unit 86 (step S10). The threshold refers to the above-mentioned rate of change K1, time length threshold value K2, and rate of change threshold value K3. After reading the threshold value, in the switch batch monitoring device 24, the monitoring unit 93 monitors the measured values of the main currents I1 and I2 (step S12), and the main current I1 changes (rises) at a predetermined rate of change K1 or more. It is determined whether or not the device is used (step S14). When the switch batch monitoring device 24 determines that the main current I1 has not changed at a predetermined rate of change K1 or more (step S14; No), the switch returns to step S12 and continues monitoring. When the switch batch monitoring device 24 determines that the main current I1 has changed at a predetermined rate of change K1 or more (step S14; Yes), the main current waveform recording unit 94 records the waveform of the main current I1 (step). S16).

When the switch batch monitoring device 24 finishes recording the waveform of the main current I1, the determination unit 96 determines the length from the first time to the second time and the peak value of the rate of change from the waveform data of the main current I1. Acquire (step S18). In the determination unit 96, the waveform of the main current I1 rises from the first time when the rate of change first starts to rise to the second time thereafter, and falls from the second time to the third time. Then, it is judged whether the current rises again from the third hour. When the determination unit 96 determines that the waveform of the main current I1 corresponds to the above, the determination unit 96 calculates the length from the first time to the second time, and the positive peak of the rate of change from the first time to the second time. The value (in the example of FIG. 3, the rate of change A1 at time t11A) is calculated.

After acquiring the length from the first hour to the second hour and the peak value of the rate of change between them, the switch batch monitoring device 24 determines that the length from the first hour to the second hour is determined by the determination unit 96. It is determined whether the time length threshold value is K2 or less (step S20). That is, the determination unit 96 determines whether the time from the timing when the rate of change first starts to rise to the timing when the rate of change peaks is equal to or less than the time length threshold value K2. When it is determined that the length from the first hour to the second hour is not less than or equal to the time length threshold value K2 (longer than the time length threshold value K2) (step S20; No), the period from the first hour to the third hour Assuming that the waveform is not due to the control current of the seal-in circuit 72 (not in the control state), this process ends.

When it is determined that the length from the first hour to the second hour is equal to or less than the time length threshold value K2 (step S20; Yes), the determination unit 96 further determines the rate of change from the first hour to the second hour. It is determined whether or not the peak value of is equal to or higher than the change rate threshold value K3 (step S22). When the determination unit 96 determines that the peak value of the rate of change is not equal to or higher than the rate of change threshold value K3 (smaller than the rate of change threshold value K3) (step S22; No), the peak waveform from the first time to the third time is determined. This process is terminated because it is not due to the control current of the seal-in circuit 72 (not in the control state). When the determination unit 96 determines that the peak value of the rate of change is equal to or greater than the rate of change threshold value K3 (step S22; Yes), the determination unit 96 determines that the rate of change of the main current I1 is in the control state (step S24). That is, in the determination unit 96, when the length from the first time to the second time is short and the peak value of the rate of change is high, the waveform between the first time and the third time is the seal-in circuit 72. It is determined that this is due to the control current of.

After determining that the switch is in the control state, the waveform processing unit 98 determines that the switch batch monitoring device 24 has the timing of the third time (time t11B in FIG. 3) and the main current in the third time from the waveform of the main current I1. The current value of I1 (current value B2 in FIG. 3) is acquired (step S26), and waveform processing is performed to extract the current waveform (step S28). The waveform processing unit 98 is a waveform after the third time from the waveform of the main current I1, and is a current value of the main current I1 in the second time from the current value of the main current I1 (current value B2 in the example of FIG. 3). The waveform obtained by subtracting is extracted to obtain a current waveform. This process ends with the extraction of the current waveform.

As described above, when the waveform of the main current I1 from the first time to the third time satisfies a predetermined condition, the switch batch monitoring device 24 determines that the seal-in circuit 72 is operating at that time. By excluding the operating time of the seal-in circuit 72, the current waveform for determining the operating state of the switch is extracted. Then, the switch batch monitoring device 24 determines, based on the extracted current waveform, whether the current waveform is the waveform of the control current of the switch 20 by the control current determination unit 99. Hereinafter, the determination processing flow of the control current determination unit 99 will be described.

FIG. 7 is a flowchart illustrating a flow of determining whether or not the waveform is a control current by the control current determination unit. As shown in FIG. 7, after the waveform processing unit 98 performs waveform processing to extract the current waveform (step S28), the control current determination unit 99 has the current value in the extracted current waveform equal to or higher than the specified current value. (Step S30). The control current determination unit 99 determines whether the maximum value of the current value in the extracted current waveform is equal to or greater than the specified current value. The specified current value is, for example, 1A, and in step S30, the current waveform is described above. It is for determining whether or not the first characteristic is satisfied. When the current value is equal to or higher than the specified current value (step S30; Yes), it is determined whether the initial waveform of the extracted current waveform rises with a time constant (L / R) (step S32). In this step S32, it is determined whether or not the current waveform satisfies the above-mentioned third characteristic. When it is determined that the initial waveform is rising by the time constant (L / R) (step S32; Yes), the control current determination unit 99 confirms whether or not an inrush current is generated (step S36). The inrush current is a large current that temporarily flows when a power is turned on to an electric device. The control current determination unit 99 determines that the inrush current has not been generated based on the open / closed state of the molded case circuit breaker 37. When no inrush current is generated (step S36; Yes), the control current determination unit 99 determines that this current waveform is the waveform of the control current of the switch 20 and determines the current waveform of the switch 20. It is recorded as a waveform of the control current (step S38). The control current determination unit 99 calculates the time when the control current flows through the switch 20 and the peak value of the control current based on the current waveform determined to be the waveform of the control current. The control current determination unit 99 may determine whether the switch 20 is operating normally based on this time and the peak value. Further, the operator may determine whether the switch 20 is operating normally based on the waveform recorded by the control current determination unit 99, the calculated time, the peak value, and the like. This process ends in step S38.

Further, in step S30, when it is determined that the current value of the current waveform is not equal to or higher than the specified current value (step S30; No), it is difficult to determine the control current waveform. Therefore, the control current determination unit 99 is used for the operating current. Based on the measured value of the main current I2, it is confirmed whether the main current I2 for the operating current is equal to or higher than the specified current value (step S34). The control current determination unit 99 confirms whether the maximum current value when the steady current is subtracted from the main current I2 is equal to or more than the specified current amount (for example, 2A to 5A) specified as the operating current. When the main current I2 is equal to or higher than the specified current value (step S34; Yes), the process proceeds to step S36. When the main current I2 is not equal to or higher than the specified current value (step S34; No), it is determined that the extracted current waveform is not the control current waveform of the switch 18, and this process is terminated without recording the current waveform. Further, in step S32, when it is determined that the initial waveform in the current waveform does not increase due to the time constant (L / R) (step S32; No), and when it is determined in step S36 that there is an inrush current (step S36). Even in the case of No), it is determined that the extracted current waveform is not the control current waveform of the switch 18, and this process is terminated without recording the current waveform.

Even if the current waveform is not extracted in the process of FIG. 6, that is, even if it is determined that the control current is not flowing in the seal-in circuit 72, the process after step S30 using the recorded waveform of the main current I1. It is also possible to determine whether the waveform of the main current I1 is the control current waveform of the switch and record the waveform. As a result, both the waveform of the control current of the switch 18 having the seal-in circuit 72 and the waveform of the control current of the switch 20 not having the seal-in circuit 72 can be appropriately extracted.

As described above, the switch batch monitoring device 24 according to the present embodiment includes a plurality of switches (switches 18 and 20 in the example of FIG. 1) in which at least one is connected to the seal-in circuit 72. At the electric station 110 having a control power supply (DC power supply device 10), the operation of a plurality of switches is collectively monitored. The control power supply supplies the control current supplied to each of the plurality of switches and the device 22 other than the switches as the main current I1. The switch batch monitoring device 24 includes a current acquisition unit 90, a determination unit 96, and a waveform processing unit 98. The current acquisition unit 90 acquires the measured value of the main current I1. Based on the measured value of the main current I1, the determination unit 96 increases the rate of change of the main current I1 between the first time and the second time, and decreases between the second time and the third time. It is determined whether the control state is rising again from the third hour. When the determination unit 96 determines that it is in the control state, it determines that the main current I1 has been supplied to the seal-in circuit 72 during the first to third hours. When the determination unit 96 determines that the determination unit 96 is in the control state, the waveform processing unit 98 executes waveform processing based on the waveform of the main current I1 from the third time to determine the operating state of the switch 18. Extract the current waveform.

Here, the switch 18 to which the seal-in circuit 72 is connected is connected to the trip circuit 71 after the current peak that first operates the seal-in circuit 72 rises when the main current I1 is supplied as the control current. When the control current flows, the second current peak rises, and the switch 18 starts operating. For example, when it is determined that the switch 18 has started the operation triggered by the rise of the current peak, the switch is operated even when the seal-in circuit 72 is operating but the trip circuit 71 is not operating. There is a risk of erroneously determining that 18 is operating. The current value of the main current I1 is the total value of the steady-state current, the current value flowing through the seal-in circuit 72, and the current value flowing through the trip circuit 71. However, the current value flowing through the seal-in circuit 72 cannot be grasped, and the current value flowing through the trip circuit 71, that is, the control current value of the switch 18, may be erroneously measured. Further, when determining whether the waveform of the main current I1 is the control current waveform by the current value, there is a possibility that the determination is erroneously determined to be not the control current. In this way, if the waveform of the main current I1 is used to determine the operation of the switch 18 to which the seal-in circuit 72 is connected, the waveform of the control current of the switch 18 cannot be properly extracted, and the switch 18 cannot be properly extracted. Operation may not be properly monitored.

On the other hand, the switch batch monitoring device 24 according to the present embodiment is based on the rate of change of the main current I1 and, when the condition that the rate of change is in the control state is satisfied, from the first hour to the third hour. It is determined that the main current I1 is flowing through the seal-in circuit 72, and the operation of the switch 18 has not started during that time. Then, based on the waveform of the main current I1 from the third time when the operation of the switch 18 is considered to have started, the current waveform for determining the operating state of the switch 18 is extracted. In this way, the switch batch monitoring device 24 appropriately detects the timing at which the seal-in circuit 72 is operating when extracting the waveform of the control current of the switch 18 based on the waveform of the main current I1. The waveform is extracted except for the timing. Therefore, the switch / switch batch monitoring device 24 can appropriately extract the waveform of the control current of the switch 18 and appropriately monitor the operation of the switch 18. Further, since the switch including the seal-in circuit 72 can be collectively monitored only by processing the waveform of the main current I1, the operation of the switch can be easily monitored.

Further, the determination unit 96 determines that the control state is in effect when the rate of change of the main current I1 reaches a peak value in the second time, becomes 0 in the third time, and rises again from the third time. Since the switch batch monitoring device 24 determines that the seal-in circuit 72 is operating when such a condition is satisfied, it is possible to determine whether the switch 18 including the seal-in circuit 72 is operating. It can be detected with high accuracy.

Further, the determination unit 96 determines that the control state is in effect when the length of the time from the first time to the second time is equal to or less than the predetermined time length threshold value K2. Further, the determination unit 96 determines that the control state is in effect when the maximum value of the rate of change of the main current I1 from the first time to the second time is equal to or greater than the predetermined rate of change threshold value K3. Since the switch batch monitoring device 24 determines that the seal-in circuit 72 is operating when such a condition is satisfied, it is possible to determine whether the switch 18 including the seal-in circuit 72 is operating. It can be detected with high accuracy.

Further, when the determination unit 96 determines that the control state is determined, the waveform processing unit 98 processes the waveform based on the waveform obtained by subtracting the current value of the main current I1 in the third time from the waveform of the main current I1 from the third time. To execute. The waveform processing unit 98 extracts a waveform obtained by subtracting the current value of the main current I1 in the third time, that is, the current value flowing through the seal-in circuit 72, as a current waveform for operation determination. Therefore, the switch batch monitoring device 24 can extract the waveform of the control current of the switch 18 with higher accuracy and appropriately monitor the operation of the switch 18.

Further, in the switch batch monitoring device 24, the monitoring unit 93 that detects whether the main current I1 acquired by the current acquisition unit 90 is at least a predetermined rate of change K1 and the monitoring unit 93 are at least a predetermined rate of change K1. Further includes a main current waveform recording unit 94 that records the waveform of the main current I1 when the above is detected. The determination unit 96 determines whether or not it is in the control state based on the waveform of the main current I1. The switch batch monitoring device 24 records the waveform of the main current I1 when the main current I1 changes a predetermined value, and checks whether the current is flowing in the seal-in circuit 72 based on the waveform of the main current I1. to decide. Therefore, the switch batch monitoring device 24 can easily and accurately determine whether or not a current is flowing through the seal-in circuit 72, and can easily monitor the operation of the switch.

Further, when the main current I1 is supplied, the seal-in circuit 72 causes the switch 18 to supply the main current I1 by closing the contacts 71A1 and 71A2 of the switch 18 connected to the seal-in circuit 72. The switch 18 is opened. Since the switch batch monitoring device 24 can appropriately determine whether or not a current is flowing through such a seal-in circuit 72, it is possible to easily monitor the operation of the switch.

FIG. 8 is a schematic view showing another example of the switch. As shown in FIG. 8, the switch 18a having the seal-in circuit 72 may be provided with the current detection unit S3 in the trip circuit 71a. The current detection unit S3 is in series with the contact 71A and is arranged on the control distribution line P1 side of the contact 71A, but if it is a position where it can be confirmed whether a current is flowing through the trip circuit 71a, the current detection unit S3 is It is not limited to the position. The current detection unit S3 is a sensor capable of confirming whether or not a current is flowing through the trip circuit 71a. In this example, it is a clamp type current transformer capable of measuring the current value flowing through the trip circuit 71a. The switch batch monitoring device 24 acquires information from the current detection unit S3 as to whether a current is flowing in the trip circuit 71a, that is, whether a control current is flowing. When a plurality of switches 18a are provided, for example, the switch batch monitoring device 24 can confirm to which switch 18a a current has flowed from the current detection unit S3. Therefore, according to the switch batch monitoring device 24, it is possible to recognize which switch the control current waveform of the extracted switch belongs to. For example, when a malfunction is confirmed from the waveform, which switch It becomes possible to easily confirm whether or not is malfunctioning. Therefore, according to such a configuration, a plurality of switches can be more preferably collectively monitored. It is preferable that the current detection unit S3 is provided at the same position even with respect to the switch 20 in which the seal-in circuit 72 is not provided.

Although the embodiments of the present invention have been described above, the present invention is not limited to the contents of these embodiments. Further, the above-mentioned components include those that can be easily assumed by those skilled in the art, those that are substantially the same, that is, those having a so-called equal range. Furthermore, the components described above can be combined as appropriate. Further, various omissions, replacements or changes of components can be made without departing from the gist of the above-described embodiment.

10 DC power supply device 12, 14 Distribution board 16 Remote control device 18, 20 Switch 22 Equipment 24 Switch batch monitoring device 26 Remote monitoring control device 71 Detachment circuit 72 Seal-in circuit 90 Current acquisition unit 92 Sampling unit 93 Monitoring unit 94 Main current waveform recording unit 96 Judgment unit 98 Waveform processing unit 99 Control current judgment unit 100 Distribution system 110 Electric station I1 Main current

Claims (9)

A plurality of switches whose at least one is connected to a seal-in circuit, and a control power supply that supplies control currents supplied to each of the plurality of switches and devices other than the switches as main currents. A switch batch monitoring device that collectively monitors the operation of the plurality of switches in an electric circuit having a.
A current acquisition unit that acquires the measured value of the main current, and
In a controlled state in which the rate of change of the main current increases from the first hour to the second hour, decreases from the second hour to the third hour, and increases again from the third hour. A determination unit that determines that the main current has been supplied to the seal-in circuit between the first time and the third time when the control state is determined.
A waveform that extracts a current waveform for determining the operating state of the switch by executing waveform processing based on the waveform of the main current from the third time when the determination unit determines the control state. Processing unit and
A switch batch monitoring device that has. The determination unit determines that the control state is reached when the rate of change of the main current reaches a peak value in the second time, becomes 0 in the third time, and rises again from the third time. The switch batch monitoring device according to claim 1. Claim 1 or claim 2 in which the determination unit determines that the control state is in effect when the length of the time from the first time to the second time is equal to or less than a predetermined time length threshold value. Switch batch monitoring device described in. The determination unit determines that it is in the control state when the maximum value of the rate of change of the main current from the first time to the second time is equal to or greater than a predetermined rate of change threshold value. The switch batch monitoring device according to any one of claims 3. When the determination unit determines that the control state is determined, the waveform processing unit is based on a waveform obtained by subtracting the current value of the main current in the third time from the waveform of the main current from the third time. The switch batch monitoring device according to any one of claims 1 to 4, which executes waveform processing. A monitoring unit that detects whether the main current acquired by the current acquisition unit is equal to or greater than a predetermined rate of change.
Further, it has a main current waveform recording unit that records the waveform of the main current when the monitoring unit detects that the rate of change is equal to or higher than the predetermined rate of change.
The switch batch monitoring device according to any one of claims 1 to 4, wherein the determination unit determines whether or not it is in the control state based on the waveform of the main current. When the main current is supplied, the seal-in circuit closes the contact of the switch connected to the seal-in circuit to supply the main current to the switch to open the switch. The switch batch monitoring device according to any one of claims 1 to 6, which is to be used. A plurality of switches whose at least one is connected to a seal-in circuit, and a control power supply that supplies control currents supplied to each of the plurality of switches and devices other than the switches as main currents. This is a switch batch monitoring method for collectively monitoring the operation of the plurality of switches in an electric circuit having a.
The current acquisition step for acquiring the measured value of the main current and
In a controlled state in which the rate of change of the main current increases from the first hour to the second hour, decreases from the second hour to the third hour, and increases again from the third hour. A determination step of determining whether or not the current is present, and determining that the main current has been supplied to the seal-in circuit between the first time and the third time when the control state is determined.
A waveform that extracts a current waveform for determining the operating state of the switch by executing waveform processing based on the waveform of the main current from the third time when the control state is determined in the determination step. Processing steps and
A method for collectively monitoring switches. A plurality of switches whose at least one is connected to a seal-in circuit, and a control power supply that supplies control currents supplied to each of the plurality of switches and devices other than the switches as main currents. For an information processing device that collectively monitors the operation of the plurality of switches in an electric circuit having
The current acquisition step for acquiring the measured value of the main current and
In a controlled state in which the rate of change of the main current increases from the first hour to the second hour, decreases from the second hour to the third hour, and increases again from the third hour. A determination step of determining whether or not the current is present, and determining that the main current has been supplied to the seal-in circuit between the first time and the third time when the control state is determined.
A waveform that extracts a current waveform for determining the operating state of the switch by executing waveform processing based on the waveform of the main current from the third time when the control state is determined in the determination step. Processing steps and
A switch batch monitoring program for executing.

Images