JP6037763B2 - Gas insulated switchgear - Google Patents

Description

  The present invention relates to a gas insulated switchgear in which a plurality of disconnectors are arranged on an annular bus.

  In a gas insulated switchgear having an annular bus, in order to disconnect a part of the annular bus from the system for inspection, etc., by disposing a plurality of circuit breakers on the annular bus and opening a desired circuit breaker among them A configuration in which a section on the annular bus line divided by the opened circuit breaker is separated from the system can be considered. Moreover, the section can be added to the system again by reopening the opened circuit breaker.

  Thus, by arranging a plurality of circuit breakers with excellent current switching performance on the annular bus, the section on the annular bus divided by the circuit breaker can be separated from the system, but the circuit breaker is expensive. The cost increases, and there is a problem that such a configuration is not suitable as a configuration of a substation equipment for general consumers. Therefore, a configuration in which the circuit breaker on the annular bus is replaced with a disconnecting switch has been put into practical use.

  In Patent Document 1, the voltage and phase at both ends of a switch for forming a loop between distribution systems are detected, and based on these detected values, transmission voltage at a substation, transmission current, distribution system impedance, and the like. A distribution system loop switching determination system that determines whether or not a loop can be formed by calculating a power flow in a loop and comparing the calculation result with a threshold value is described.

JP 2006-230164 A

  The disconnector on the annular bus has an obligation to open and close a current flowing through the bus up to a certain value (current switching obligation). The current switching duty is defined in the standard for each disconnector according to the system configuration.

  On the other hand, in a gas-insulated switchgear equipped with a disconnector on the annular bus, in reality, a current exceeding the current switching duty of the disconnector may flow. In this case, the disconnector is opened and closed according to the standard. However, when an open command or a close command is issued, the disconnector will be shut off or turned on, making it difficult to meet the equipment performance specified in the standard. was there.

  The present invention has been made in view of the above, and in a gas insulated switchgear having a plurality of disconnectors on an annular bus, the disconnector is opened for a current exceeding an openable responsibility. An object of the present invention is to provide a gas insulated switchgear that can satisfy the equipment performance specified in the standard.

  In order to solve the above-described problems and achieve the object, a gas-insulated switchgear according to the present invention is connected to an annular bus, a plurality of power supply feeders connected to the annular bus, and the annular bus. , The same number of load-side feeders as the power-source-side feeders, a plurality of disconnectors disposed on the annular bus, and adjacent to each of the disconnectors, and the current flowing through the disconnectors, respectively Measuring current transformers to be measured and corresponding to each of the disconnecting devices, and the current measuring value obtained from the measuring current transformer adjacent to the disconnecting device can be interrupted by the disconnecting switch defined by the standard. If the measured current value is larger than the current value that can be interrupted by the disconnecting device, an interlock is applied to the opening operation of the disconnecting device to prevent the opening operation. An interlock control unit The features.

  According to the present invention, in a gas-insulated switchgear having a plurality of disconnectors on the annular bus, for currents that exceed the responsibilities that can be opened, the disconnector is not opened, and is defined in the standard. There is an effect that a gas insulated switchgear capable of satisfying the device performance can be obtained.

FIG. 1 is a schematic diagram showing a configuration of a gas insulated switchgear according to Embodiment 1. FIG. 2 is a schematic diagram illustrating a configuration of a gas-insulated switchgear according to the second embodiment.

  Embodiments of a gas insulated switchgear according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a schematic diagram showing a configuration of a gas insulated switchgear according to the present embodiment. In the present embodiment, a case where the disconnectors 15a to 15d are shut off (opened) will be described.

  As shown in FIG. 1, power supply side power supply lines 10a and 10b and load side power supply lines 17a and 17b are connected to an annular bus 14 formed by forming a bus in a loop shape. The power supply lines 10a and 10b are each connected to a power supply (not shown). The load side power supply lines 17a and 17b are each connected to a load (not shown). In the present embodiment, a configuration example of two lines is shown, but a configuration in which three or more feeders are connected may be used, and the present embodiment can be easily applied to this case. Redundancy can be ensured by using a plurality of feeder lines.

  On the power supply side power supply line 10a, a circuit breaker 11a and a current transformer 12a for measuring a power supply side current for measuring a current flowing through the power supply line and flowing into the annular bus 14 are arranged. On the power supply side power supply line 10b, a circuit breaker 11b, a current transformer 12b for measuring a power supply side current for measuring a current flowing through the power supply line and flowing into the ring bus 14, a circuit breaker 11b and the ring bus 14 The disconnector 13 connected between the two is disposed.

  On the load side power supply line 17a, a circuit breaker 18a and a load current measuring instrument current transformer 19a for measuring a current flowing through the power supply line and flowing out from the annular bus 14 are arranged. On the load-side power supply line 17b, a circuit breaker 18b, a load-side current measuring instrument current transformer 19b for measuring a current flowing through the power supply line and flowing out from the ring-shaped bus 14, a circuit breaker 18b and the ring-shaped bus 14 The disconnector 20 connected between the two is disposed.

  On the annular bus 14, disconnectors 15a to 15d and current transformers 16a to 16d for measuring currents flowing through the disconnectors 15a to 15d are arranged. Instrument current transformers 16a to 16d are arranged adjacent to disconnectors 15a to 15d, respectively. The disconnector 15 a is disposed in a section on the annular bus 14 between the connection point between the power supply line 10 b and the annular bus 14 and the connection point between the load side supply line 17 b and the annular bus 14. The disconnector 15 b is arranged in a section on the annular bus 14 between the connection point between the power supply line 10 a and the annular bus 14 and the connection point between the power supply line 10 b and the annular bus 14. The disconnector 15 c is disposed in a section on the annular bus 14 between the connection point between the power supply line 10 a and the annular bus 14 and the connection point between the load side supply line 17 a and the annular bus 14. The disconnector 15 d is disposed in a section on the annular bus 14 between the connection point between the load-side power supply line 17 a and the annular bus 14 and the connection point between the load-side power supply line 17 b and the annular bus 14. In this way, one disconnector is arranged in each section on the annular bus 14 that is divided at each connection point between the power supply wires 10a and 10b and the load-side feeders 17a and 17b and the annular bus 14. Thus, inspection of equipment can be facilitated. It should be noted that disconnectors can be arranged at other locations on the annular bus 14 depending on the device configuration.

  The disconnector 15a is responsible for interrupting a current equal to or less than a certain current value (Ka) defined by the standard. In other words, the disconnector 15a is guaranteed to satisfy the device performance in accordance with the standard when cutting off a current of Ka or less. However, in the configuration of FIG. 1, in general, a current having a current value exceeding the opening duty may flow through the disconnector 15a. In this case, if the disconnector 15a is opened, the device performance may not be satisfied. There is. Therefore, in the present embodiment, the following configuration is adopted to prevent such a problem from occurring.

  In FIG. 1, the disconnector 15a is connected to the operating device 31a. The operating device 31a is a device for opening and closing the disconnector 15a. An interlock control unit 30a is connected to the instrument current transformer 16a and the operating device 31a. The current value Ia (current measurement value) flowing through the disconnector 15a measured by the instrument current transformer 16a is transmitted to the interlock control unit 30a. When the current value Ia obtained from the current transformer 16a is not less than or equal to the current value (Ka) that can be interrupted by the disconnect switch 15a, the interlock control unit 30a is configured to output an opening command to the operating device 31a. Even so, the opening operation of the operating device 31a is interlocked to prevent the disconnecting device 15a from opening. The interlock control unit 30a is composed of, for example, a relay circuit including a contact and a coil. When the current value Ia obtained from the current transformer 16a is not less than the current value (Ka) that can be interrupted by the disconnector 15a, For example, when the contact is closed, the disconnector 15a operates to prevent the opening operation. In addition, the interlock control unit 30a is generally configured in a state where, for example, the contact is open when the current value Ia obtained from the instrument current transformer 16a is equal to or less than the current value (Ka) that can be interrupted by the disconnector 15a. When the opening operation enabling condition is satisfied, the disconnecting device 15a operates to allow the opening operation.

  The above description is the same for the disconnectors 15b to 15d. That is, for the disconnector 15b, an interlock control unit 30b connected to the operating device 31b and the instrument current transformer 16b is provided, and for the disconnector 15c, the operating device 31c and the instrument current transformer are provided. An interlock control unit 30c connected to 16c is provided, and an interlock control unit 30d connected to the operating device 31d and the instrument current transformer 16d is provided for the disconnector 15d. When the current value Ib (current measurement value) obtained from the instrument current transformer 16b is not less than or equal to the current value (Kb) that can be interrupted by the disconnector 15b, the interlock control unit 30b instructs the operating device 31b to open. Is output, the opening operation of the operating device 31b is interlocked and the opening operation of the disconnector 15b is prevented. When the current value Ic (current measurement value) obtained from the current transformer 16c is not less than or equal to the current value (Kc) that can be interrupted by the disconnector 15c, the interlock control unit 30c instructs the operating device 31c to open. Is output, the opening operation of the operating device 31c is interlocked to prevent the disconnecting device 15c from opening. When the current value Id (current measurement value) obtained from the instrument current transformer 16d is not less than or equal to the current value (Kd) that can be interrupted by the disconnector 15d, the interlock control unit 30d instructs the operating device 31d to open. Is output, the opening operation of the operating device 31d is interlocked and the opening operation of the disconnector 15d is prevented. Ka to Kd are generally different from each other.

  The interlock control parts 30a-30d can be provided in the control panel which controls the component apparatus of a gas insulated switchgear, for example. In the illustrated example, the interlock control units 30a to 30d are described as being separated from each other, but may be provided integrally.

  Next, the operation of the present embodiment will be described. Hereinafter, for example, the breaking (opening) operation of the disconnect switch 15a will be described, but the same applies to the disconnect switches 15b to 15d.

It is assumed that the disconnector 15a is in a closed state. The interlock control unit 30a allows the opening operation of the disconnecting device 15a only when the condition for enabling the opening operation of the disconnecting device 15a is satisfied, and otherwise interlocks the opening operation of the disconnecting device 15a. Call. The condition for opening the disconnector 15a is when one of the following is satisfied.
(A1) The disconnectors 15b to 15d are closed and Ia ≦ Ka.
(A2) The disconnector 15d is open and the disconnector 20 is open.
(A3) The disconnector 15b is in an open state, and the disconnector 13 is in an open state.

  When an opening command is output to the operating device 31a, the interlock control unit 30a determines whether any of the above conditions (A1) to (A3) is satisfied, and if any is satisfied Since the interlock is not applied, the opening operation of the operating device 31a that is started by energizing the open electromagnetic contactor (not shown) is permitted, and the disconnector 15a is changed from the closed state to the open state. In addition, although illustration is abbreviate | omitted, the interlock control part 30a shall acquire the information regarding the open / close state of the other disconnectors 15b-15d, 13,20.

  As described above, according to the present embodiment, in a gas insulated switchgear having a plurality of disconnectors 15a to 15d on the annular bus 14, an interlock is provided for a current exceeding the duty that can be opened. Since the interlocks are applied by the control units 30a to 30d, the disconnectors 15a to 15d are not opened, so that the equipment performance defined in the standards of the disconnectors 15a to 15d can be satisfied.

Embodiment 2. FIG.
FIG. 2 is a schematic diagram showing a configuration of the gas insulated switchgear according to the present embodiment. In the present embodiment, the case where the disconnectors 15a to 15d are turned on will be described. In FIG. 2, the same components as those in FIG. 1 are denoted by the same reference numerals.

  As shown in FIG. 2, in this gas-insulated switchgear, the current value Ja measured by the instrument current transformer 12a on the power supply line 10a and the measurement by the instrument current transformer 12b on the power supply line 10b. The current value Jb is input to the interlock control unit 30a. In addition, although illustration is abbreviate | omitted, the electric current value Ja by measurement of the measuring instrument current transformer 12a on the power supply side feeder 10a and the electric current value Jb by measurement of the measuring instrument current transformer 12b on the power supply side supply line 10b are as follows. These are also input to the interlock control units 30b to 30d, respectively. The interlock control units 30a to 30d have the functions described below in addition to the functions described in the first embodiment.

  The disconnector 15a is responsible for supplying a current equal to or less than a certain current value (Ka) determined by the standard. That is, the disconnector 15a is guaranteed to satisfy the device performance as specified when a current of Ka or less is applied. However, in the configuration of FIG. 2, a current having a current value exceeding the charging duty may generally flow through the disconnecting switch 15a. In this case, if the disconnecting switch 15a is switched on, the device performance may not be satisfied. There is. Therefore, in the present embodiment, the following configuration is adopted to prevent such a problem from occurring.

  The interlock control unit 30a calculates the sum (Ja + Jb) of the current value Ja (current measurement value) obtained from the instrument current transformer 12a and the current value Jb (current measurement value) obtained from the instrument current transformer 12b. If the calculated value is not equal to or less than the current value (Ka) that can be turned on by the disconnector 15a, even if a closing command is output to the operating device 31a, Interlock is applied to prevent the disconnecting device 15a from being turned on. If the disconnector 15a is turned on when the total value is not less than or equal to the current value (Ka) that can be turned on by the disconnector 15a, a current having a current value larger than Ka may flow in the disconnected switch 15a. Because there is. The interlock control unit 30a operates so as to allow the closing operation of the disconnecting switch 15a in general when the total value is equal to or less than the current value Ka that can be disconnected by the disconnecting switch 15a and when other enabling operation conditions are satisfied. To do.

  The above description is the same for the disconnectors 15b to 15d. For example, the interlock control unit 30b determines that the operating device is not operated even when a closing command is output to the operating device 31b when the total value is not less than the current value (Kb) that can be turned on by the disconnector 15b. An interlock is applied to the closing operation of 31b to prevent the closing operation of the disconnector 15b. In addition, the interlock control unit 30c is configured so that the summing value does not exceed the current value (Kc) that can be turned on by the disconnector 15c, even if the closing command is output to the operating device 31c. An interlock is applied to the closing operation of 31c to prevent the closing operation of the disconnector 15c. Further, the interlock control unit 30d determines that the operation device is not operated even when a closing command is output to the operation device 31d when the total value is not less than or equal to the current value (Kd) that can be turned on by the disconnector 15d. An interlock is applied to the closing operation of 31d to prevent the closing operation of the disconnector 15d.

  Other configurations of the present embodiment are the same as those of the first embodiment shown in FIG.

  Next, the operation of the present embodiment will be described. In the following, for example, the closing operation of the disconnector 15a will be described, but the same applies to the disconnectors 15b to 15d.

It is assumed that the disconnector 15a is in an open state. The interlock control unit 30a allows the closing operation of the disconnecting device 15a only when the condition for enabling the closing operation of the disconnecting device 15a is satisfied, and otherwise interlocks the closing operation of the disconnecting device 15a. Call. The condition for enabling the closing operation of the disconnector 15a is when one of the following is satisfied.
(B1) The disconnectors 15b to 15d are closed and Ja + Jb ≦ Ka.
(B2) The disconnector 15d is open, and the disconnector 20 is open.
(B3) The disconnector 15b is open and the disconnector 13 is open.

  When a closing command is output to the operating device 31a, the interlock control unit 30a determines whether any of the above conditions (B1) to (B3) is satisfied, and if any is satisfied Since the interlock is not applied, the closing operation of the operating device 31a starting with the urging of the closing electromagnetic contactor (not shown) is permitted, and the disconnector 15a is changed from the open state to the closed state.

  As described above, according to the present embodiment, in the gas insulated switchgear having the plurality of disconnectors 15a to 15d on the annular bus 14, the current exceeding the duty that can be turned on is interlocked. Since the interlocks are applied by the control units 30a to 30d, the disconnectors 15a to 15d are not thrown in, so that the device performance defined in the standards of 15a to 15d can be satisfied. Other operations and effects of the present embodiment are the same as those of the first embodiment. Further, as in the first embodiment, the number of feeder lines can be easily expanded to three or more.

  In the present embodiment, the sum of the current value Ja measured by the instrument current transformer 12a on the power supply line 10a and the current value Jb measured by the instrument current transformer 12b on the power supply line 10b. The condition that the value is equal to or less than the current value (Ka to Kd) that can be applied to the disconnecting devices 15a to 15d is set as a part of the enabling operation condition of the disconnecting devices 15a to 15d. The sum of the current value measured by the current transformer 19a and the current value measured by the instrument current transformer 19b on the load-side power supply line 17b is a current value (Ka to Kd) that can be input to the disconnectors 15a to 15d. The following conditions may be used as (a part of) the operation enabling condition of the disconnectors 15a to 15d.

  Patent Document 1 discloses a technique related to loop switching of a power distribution system. However, since it relates to a power distribution system, it is understood that a switch assumes a circuit breaker, and gas in the first place. Since it is not applied to an insulated switchgear, the configuration is different from the first and second embodiments.

  The present invention is useful as a gas insulated switchgear in which a plurality of disconnectors are arranged on an annular bus.

10a, 10b Power supply line, 11a, 11b, 18a, 18b Breaker, 12a, 12b, 16a-16d, 19a, 19b Current transformer for instrument, 14 Ring bus, 15a-15d, 13, 20 Disconnector, 17a , 17b Load side power supply line, 30a to 30d interlock control unit, 31a to 31d operation device.

Claims (4)

An annular bus,
A plurality of power supply wires connected to the annular bus;
Connected to the annular bus, and the same number of load-side feeders as the power-side feeders;
A plurality of disconnectors disposed on the annular bus;
A current transformer for an instrument that is provided adjacent to each of the disconnectors, and measures current flowing through the disconnector;
Determine whether or not the current measurement value provided from each of the current transformers provided corresponding to each disconnector and adjacent to the disconnector is less than or equal to the current value that can be interrupted by the disconnector specified by the standard. When the current measurement value is larger than the current value that can be interrupted by the disconnecting device, an interlock control unit that applies an interlock to the opening operation of the disconnecting device and prevents the opening operation;
Equipped with a,
Each of the plurality of power supply side feeders is provided with a current transformer for measuring a power supply side current,
Each of the interlock control units is a current value that can be input to the disconnector controlled by the interlock control unit by adding the current measurement values obtained from all of the current transformers for measuring the power source side current. determines whether the following, if the sum is greater than can be charged current value of the disconnector is subjected to interlock with respect to the input operation of the disconnector, that you arresting its closing operation Characterized gas insulated switchgear. An annular bus,
A plurality of power supply wires connected to the annular bus;
Connected to the annular bus, and the same number of load-side feeders as the power-side feeders;
A plurality of disconnectors disposed on the annular bus;
A current transformer for an instrument that is provided adjacent to each of the disconnectors, and measures current flowing through the disconnector;
Determine whether or not the current measurement value provided from each of the current transformers provided corresponding to each disconnector and adjacent to the disconnector is less than or equal to the current value that can be interrupted by the disconnector specified by the standard. When the current measurement value is larger than the current value that can be interrupted by the disconnecting device, an interlock control unit that applies an interlock to the opening operation of the disconnecting device and prevents the opening operation;
With
Each of the plurality of load-side power supply lines is provided with a current transformer for measuring a load-side current,
Each of the interlock control units is a current value that can be input to the disconnector to be controlled by the interlock control unit by adding the current measurement values obtained from all of the load-side current measuring instrument current transformers. It is determined whether or not, and when the total value is larger than the current value that can be turned on for the disconnector, an interlock is applied to the closing operation of the disconnector, and the closing operation is prevented. Ruga be vinegar-insulated switchgear. The plurality of disconnectors are arranged one by one in each section on the annular bus, which is divided by the connection points of the plurality of power supply feeders, the plurality of load feeders and the annular bus. The gas insulated switchgear according to claim 1 or 2 , characterized in that The number of each of the power supply side power supply line and the load side power supply line is two,
The gas insulated switchgear according to claim 3 , wherein the number of disconnectors on the annular bus is four.

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