JP2956446B2 - Detecting unit for failure zone of gas insulated switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated switchgear fault detecting device for detecting a fault zone when a ground fault or short-circuit fault occurs in a gas-insulated switchgear of a substation.

[0002]

2. Description of the Related Art Generally, a gas-insulated substation is composed of a plurality of gas-insulated switchgears. In addition, the gas insulated switchgear of substations is a device in which substation equipment such as circuit breakers, disconnectors, and lightning arrestors are housed in metal containers and filled with insulating gas such as sulfur hexafluoride gas. Has achieved reliability and safety. In consideration of maintenance and the like, the inside of the gas insulated switchgear is divided into a plurality of gas compartments such as a circuit breaker unit and a disconnector unit. However, if a ground fault or short-circuit fault occurs in a gas compartment inside the gas insulated switchgear, the fault can be detected and the continuation of the fault can be eliminated by the protection relay. It is not possible to identify a gas section in which a failure has occurred by using only protection relay information such as a protection relay. Also,
Since the gas insulated switchgear has a hermetic structure, it is difficult to identify a gas section in which a failure has occurred from the outside by patrol or the like by a human. On the other hand, from the viewpoint of stable supply of electric power, it is necessary to quickly recover the charging unit that does not hinder the application of a voltage in a healthy gas compartment other than the gas compartment where a failure has occurred, and shorten the power outage time.

For this reason, conventionally, a gas pressure sensor is provided for each gas section of a gas insulated switchgear, and when a ground fault or short circuit fault occurs, the gas pressure rises due to the fault arc energy, which is detected by the gas pressure sensor. In some cases, a failed section detection device that determines a gas section in which the gas pressure rise value has exceeded a certain level as a failed section is used.

[0004]

In the conventional faulty section detecting apparatus, there are cases where the faulty section cannot be determined as described below. If a ground fault or short circuit fault occurs in the gas compartment of the circuit breaker unit that houses the circuit breaker of a gas insulated switchgear, the gas pressure will increase due to the failed arc energy. However, in order to eliminate the continuation of the failure, the protection relay operates and the circuit breaker is opened by the circuit breaker opening command signal. In particular, when the bus protection relay operates, the circuit breaker of the faulty circuit breaker unit and the circuit breaker unit of another healthy gas insulated switchgear are each opened. At the time of opening, an arc is generated between the contacts of the circuit breaker, and the arc energy causes gas to be generated in the gas compartment of the failed circuit breaker unit and the gas compartment of the other sound-insulated switchgear. A pressure rise occurs. For this reason, in the conventional failure section detection device that determines the failure section by detecting the level of the gas pressure increase, the failure section cannot be distinguished from the healthy gas section, and the failure section cannot be determined. Further, when a ground fault or a short-circuit fault occurs in a gas compartment other than a circuit breaker unit for accommodating equipment other than a circuit breaker of a certain gas insulated switchgear, the gas pressure increases due to the failed arc energy. However, in the same manner as above, when the protection relay operates and the breaker opens, an arc is generated between the contacts of the breaker, and the arc energy causes the gas pressure to increase even in the healthy gas compartment of the breaker unit. Occurs. For this reason, gas pressure rises also occur in the faulty gas compartment and in the gas compartment of the sounding circuit breaker unit. Therefore, in the conventional failure section detection device that determines the failure section by detecting the level of the gas pressure rise, the failure section cannot be distinguished from the healthy gas section, and the failure section cannot be determined.

Accordingly, an object of the present invention is to detect a faulty compartment of a gas insulated switchgear which can correctly determine a faulty gas compartment even when a gas pressure rises due to an arc between contacts when the circuit breaker is opened. It is to provide a device.

[0006]

A gas pressure sensor for detecting the gas pressure of each gas section of a gas insulated switchgear having a plurality of gas sections is provided. A pressure rise detecting unit is provided for detecting a gas pressure rise in each gas section from an output signal of each gas pressure sensor. A protection relay operation detection unit for detecting a circuit breaker opening command signal or a protection relay operation signal from the protection relay is provided. This protection relay operation detection unit detects the presence of a failure, and is a pressure rise detection unit corresponding to the gas compartment in which the circuit breaker is stored, before the circuit breaker opening start time by the circuit breaker opening command signal from the protection relay. When the output indicating that the gas pressure has risen is output, a first determination unit that determines the gas section corresponding to the pressure rise detection unit that has output the presence of the gas pressure rise as a failure section is provided. If the presence of a failure is detected from the output of the protection relay operation detection unit and the presence of a gas pressure rise is output by the pressure rise detection unit corresponding to the gas compartment in which the equipment other than the circuit breaker is stored, the presence of the gas pressure rise is output. A second determining unit that determines a gas section corresponding to the pressure rise detecting unit as a failed section.

[0007]

According to the present invention, as described above, the gas section of the circuit breaker unit fails due to a gas pressure rise due to a failure arc before the start of opening of the circuit breaker by the circuit breaker opening command signal from the protection relay. The section is determined, and the gas pressure rise due to the arc between the contacts when the circuit breaker is opened is ignored. That is, the gas pressure rise due to the failed arc is distinguished from the gas pressure rise due to the arc between the contacts when the circuit breaker is opened. Only the section can be determined to be a failed section. For gas compartments other than the breaker unit, the failure compartment is determined under the condition that there is a circuit breaker opening command signal from the protection relay or the protection relay operation signal, that is, a failure condition. When the protection relay does not operate normally, the failure compartment is determined. do not do. Therefore, a distinction can be made between the gas pressure rise caused by the faulty arc at the time of failure and the gas pressure rise caused by the arc between the contacts at the time of switching operation of a switch such as a disconnector during normal operation. The gas section in which the gas pressure has increased due to the arc between the contacts is not determined to be the failure section, that is, erroneous determination is prevented, and only the gas section in which the gas pressure has increased due to the failure arc can be correctly determined to be the failure section. it can. Also, as for the breaker unit, the failure section is determined under the condition that there is a failure in the same manner as described above, so that the gas pressure rise due to the arc between the contacts when opening and closing the circuit breaker when the protection relay does not operate normally. Even if it occurs, the gas section is not determined to be a failure section, and erroneous determination can be prevented.

[0008]

1 to 5 show an embodiment of the present invention. Although the gas insulated substation is constituted by a plurality of gas insulated switchgears, FIG. 1 shows a case in which the gas insulated substation is constituted by two gas insulated switchgears 1 and 2 for simplicity of explanation. In FIG. 1, each of the gas insulated switchgears 1 and 2 includes a spacer 9.
The gas insulated switchgear 1 is divided into five gas compartments by
Kou Bus Disconnector Unit 11, Oto Bus Disconnector Unit 1
2. Circuit breaker unit 13, line disconnector unit 14, lightning arrester unit 15, and similarly gas insulated switchgear 2 includes instep bus disconnector unit 21, auxiliary bus disconnector unit 22, circuit breaker unit 23, and line disconnector unit 24. , An arrester unit 25. Further, the gas insulated switchgear 1 and 2 are connected via the spacer 9 to the insulated bus disconnector unit 1.
1 and 21 and the Oto bus disconnector units 12 and 22. In FIG. 1, the electrical connections of the main circuits of the gas insulated switchgears 1 and 2 are shown in a single-line connection diagram, 31 and 32 are bus disconnectors, 33 and 34 are line disconnectors, and 35 and 36 are cutoffs. A lightning arrester 39 is connected to these devices via a conductor 30. The circuit breakers 35 and 36 of the circuit breaker units 13 and 23 and the line disconnector 33,
And current transformers 37, 3
8 is provided, the output of which is connected to the protection relay 3.
The circuit breaker opening command signal of the protection relay 3 is output to each of the circuit breakers 35 and 36 in the circuit breaker units 13 and 23.

A gas pressure sensor group 4 is provided in each of the units 11 to 15 and 21 to 25. That is, each unit 11
Pressure sensors S11 to 15, S2 for individually detecting gas pressure corresponding to each of the gas sections
1 to 25 are provided. The gas pressure sensor group 4 is connected to a pressure rise detecting group 5. That is, the pressure rise detectors D11-15, D21-25 for individually detecting the gas pressure rise in each gas section from the output signals of the gas pressure sensors S11-15, S21-25 are connected to the gas pressure sensors S1.
1 to 15 and S21 to 25 are provided. The pressure rise detection unit D11 of the pressure rise detection unit group 5 includes, for example, a preset gas pressure rise monitoring value and a gas pressure sensor S11.
And if the output value is equal to or higher than the gas pressure rise monitoring value, it can be realized by determining that there is a gas pressure rise. Similarly, the other pressure rise detection units D12-1
5, D21 to 25 can also be realized. In the following description, the output of each of the pressure rise detection units D11 to 15 and D21 to 25 is a digital output that is “1” when there is a gas pressure rise and “0” when there is no gas pressure rise.

A protection relay operation detector 6 for detecting a circuit breaker opening command signal from the protection relay 3 is provided. The circuit breaker opening command signal from the protection relay 3 may be a protection relay operation signal.

For example, in the case of a circuit breaker opening command signal, the protection relay operation detecting section 6 uses a DC current transformer because the current is zero when there is no command output and the current flows when the command is output. By determining the presence or absence of a current, the presence or absence of a circuit breaker opening command signal can be detected. Further, in the case of the protection relay operation signal, the presence or absence of the protection relay operation from the protection relay 3 is normally output with the contacts ON and OFF, and thus can be detected by the following photocoupler circuit. A power supply is connected to one end of the contact of the protection relay 3, and the other end is connected to an input of a photocoupler via a resistor.
At the time of FF, no current flows to the input of the photocoupler and the contact O
At the time of N, a current flows to the input of the photocoupler.
The photocoupler turns on and off the output transistor depending on the presence or absence of the input current. By detecting this, the presence or absence of the protection relay operation can be detected. In addition, there are a plurality of circuit breaker opening command signals or protection relay operation signals from the protection relay 3, in which case, the DC current transformer or the photocoupler circuit is provided for each of those signals. By calculating and outputting the logical sum of these outputs, a plurality of signals can be integrated into one output. The protection relay operation detector 6 having the above-described configuration is used. In addition,
In the following description, the output of the protection relay operation detection unit 6 is a digital output that is “1” when there is a circuit breaker opening command signal or a protection relay operation signal and “0” when there is no protection relay operation signal.

The circuit breaker opening from the protection relay 3 is determined by the output of the protection relay operation detector 6 and the output of the pressure rise detectors D13, 23 corresponding to the respective circuit breaker units 13, 23 of the pressure rise detector group 5. Before the circuit breaker opening start time by the command signal, the pressure rise detection units D13 and D23 of the pressure rise detection unit group 5
Among them, there is provided a first determination unit 7 that determines a gas section of a circuit breaker unit to which a gas pressure sensor corresponding to a pressure rise detection unit that has determined that a gas pressure rise has occurred is a failure section.

The first judging unit 7 can be realized by, for example, a configuration as shown in FIG. The latch circuit L of the latch circuit group 71 is provided on the output side so as to correspond to each of the pressure rise detection sections D13 and D23 of the pressure rise detection section group 5.
13, L23. The latch circuits of the latch circuit group 71 can be realized by, for example, D-type flip-flops. Each pressure rise detection unit D13, D of the pressure rise detection group 5
23 are output to the latch circuits L13 and L13 of the latch circuit group 71.
23, and the output of the protection relay operation detection unit 6 is connected to each clock terminal of the latch circuits L13 and L23 of the latch circuit group 71. Each of the latch circuits L13 and L23 of the latch circuit group 71 stores the signal state of the input terminal at the rise of the input signal of the clock terminal, and outputs the stored state to the output terminal.

Since the circuit breaker opening command signal or the protection relay operation signal from the protection relay 3 is input to each clock terminal of the latch circuits L13 and L23 of the latch circuit group 71 via the protection relay operation detection unit 6, the circuit breaks. The output “1” of the pressure rise detection unit that determines that there is a gas pressure rise among the pressure rise detection units D13 and D23 of the pressure rise detection unit group 5 when the device opening command signal is output or when the protection relay is activated, The output “0” of the pressure rise detecting unit that has determined that there is no gas pressure rise is stored in each of the latch circuits L13 and L23 of the latch circuit group 71, and is output to the output terminal. Further, a gas pressure rise occurs after the circuit breaker opening command signal output or the protection relay operation, and the pressure rise detection section D1 of the pressure rise detection section group 5
3, D23, it is newly determined that there is a gas pressure rise, and the output of the pressure rise detection unit becomes "1". Even if it is inputted to the input terminals of the latch circuits L13, L23 of the latch circuit group 71, the clock terminal Since there is no rising signal, the latch circuits L13 and L23 of the latch circuit group 71 do not accept the signal and maintain the previous state. Therefore, even if the gas pressure rises after the circuit breaker opening command signal is output from the protection relay 3 or after the protection relay operation, it can be ignored.

A pressure rise detection unit D11, D12, D corresponding to each unit other than the circuit breaker of the pressure rise detection unit group 5 detects a failure from the output of the protection relay operation detection unit 6.
When the gas pressure rise is output in 14, D15, D21, D22, D24, and D25, the circuit breaker units 13, 23 provided with the gas pressure sensors corresponding to the pressure rise detectors that output the gas pressure rise. A second determination unit 8 for determining a gas section other than the above as a failed section is provided.

The second judging section 8 can be realized by an embodiment as shown in FIG. A timer holding circuit 81 is provided which detects that the output of the protection relay operation detecting section 6 has changed from "0" to "1", and thereafter holds for t time. Note that t is a pressure rise detection unit D13, D
In each pressure rise detection unit of the pressure rise detection unit group 5 other than 23,
After the circuit breaker opening command signal or the protection relay operation signal is output from the protection relay 3, the time required to determine that the gas pressure has increased due to a failure is set. Pressure rise detectors D13, D2
3, the pressure rise detection units D11,
D12, D14, D15, D21, D22, D24, D
25 outputs to the gate circuits G11,
G12, G14, G15, G21, G22, G24, G
25 input terminals. The output of the timer holding circuit 81 is connected to the gate circuit G1 of the gate circuit group 82.
1, G12, G14, G15, G21, G22, G2
4 and G25, respectively.
The gate circuit of the gate circuit group 82 is opened during the period when the digital signal “1” is being input to the gate control input terminal, and the state of the input signal of the input terminal is output to the output.
In addition, the gate closes during the period when the digital signal “0” is input to the gate control input terminal, and outputs “0” as the output. The gate circuit of the gate circuit group 82 can be realized by using, for example, an AND circuit, and using one input terminal of the AND circuit as a gate control input terminal of the gate circuit and the other as an input terminal of the gate circuit.

A latch circuit group 83 is provided on the output side of the gate circuit group 82. That is, the gate circuits G11, G12, G14, G15, G21, G22, G of the gate circuit group 82
24 and G25 to the latch circuits M11, M12, M14, M15, M21, M22, M of the latch circuit group 83.
24 and M25, respectively. Further, the latch circuits M11, M12, M
For example, a + 5V voltage is always applied to the input terminals of 14, M15, M21, M22, M24, and M25, and a digital signal “1” is always input. The latch circuits of the latch circuit group 83 can be realized by, for example, D-type flip-flops. Each of the latch circuits M11 and M of the latch circuit group 83
12, M14, M15, M21, M22, M24, M2
5 is a rising edge of the input signal of the clock terminal, that is, a change from “0” to “1”. Since the signal of the input terminal at that time, here “1”, is always input, “1”
And outputs the stored state to the output terminal.

Since the circuit breaker opening command signal or the protection relay operation signal from the protection relay 3 is input to the timer holding circuit 81 via the protection relay operation detection section 6, the circuit breaker opening command signal is output, or When the protection relay operates, the output of the protection relay operation detection unit 6 changes from “0” to “1”,
From that time, the output “1” is held for t time by the timer holding circuit 81, and the signal is input to the gate control input terminal of each gate circuit of the gate circuit group 82. The input terminals of the gate circuits of the gate circuit group 82 are connected to the outputs of the pressure rise detection units of the pressure rise detection unit group 5 other than the pressure rise detection units D13 and D23. For this reason, the pressure rise detection unit D1 is connected during the time t after the circuit breaker opening command signal or the protection relay operation signal is output from the protection relay 3.
3, it is determined that there is a pressure increase in the pressure rise detection unit group 5 other than D23, and only the output of the gate circuit of the gate circuit group 82 corresponding to the pressure rise detection unit that outputs “1” changes from “0”. , "1". Further, since the output is input to the clock terminal of each latch circuit of the latch circuit group 83, the latch circuit of the latch circuit group 83 corresponding to the gate circuit whose output has changed from “0” to “1” becomes “1”. Is output. As described above, the second determination unit 8 detects the presence of a failure from the output of the protection relay operation detection unit 6, and detects the pressure rise detection units D11 and D12 corresponding to each unit other than the circuit breaker of the pressure rise detection unit group 5. , D14, D15, D
It is possible to detect a pressure rise detection unit that has output the presence of a gas pressure rise among 21, D22, D24, and D25.

Next, the operation of the present invention will be described with reference to FIGS. In the following, a description will be given assuming that the circuit breaker opening command signal or the protection relay operation signal of the protection relay 3 is a circuit breaker opening command signal. FIG. 4 shows a case where a failure occurs in the circuit breaker unit 13 and FIG. 5 shows a case where a failure occurs in the instep bus disconnector unit 11, which is detected by each of the gas pressure sensors S11 to S15 and S21 to S25. Unit pressure change, each gas pressure sensor S11-1
5, each pressure rise detection unit D11-S25 from the output of S21-25
15, D21-25 show the output of the result of the determination of the presence or absence of the gas pressure increase, the breaker opening command signal of the protection relay 3, and the operation of the breakers 35 and 36. In FIG. 4, the output of the protection relay operation detection unit 6 and the output of each of the latch circuits L13 and L23 of the latch circuit group 71 are shown. In FIG. 5, the latch circuits M11, M12 and M of the latch circuit group 83 are shown.
14, M15, M21, M22, M24, M25, gate circuits G11, G12, G14,
G15, G21, G22, G24, G25 and the output of the timer holding circuit 81 are also shown.

In FIG. 1, the operation of the circuit breaker unit 13 when a ground fault or short circuit fault occurs will be described below. When the breaker unit 13 fails, the current transformer 3
The protection relay 3 determines that a failure has occurred in the gas-insulated switchgear 1 or 2 due to the failure current (in this case, the bus protection relay operates), and the circuit breaker unit 13, The circuit breaker opening instruction signal is output to each of the circuit breakers 35, 36 of 23, and the circuit breakers 35, 36 of the circuit breaker units 13, 23 operate and open. For this reason, the unit whose gas pressure rises first is the circuit breaker unit 13 in which the gas pressure rises due to the fault arc. Then, according to the circuit breaker opening command signal from the protection relay 3,
Since the circuit breakers 35 and 36 of the circuit breaker units 13 and 23 are opened, an arc between the contacts of the circuit breakers 35 and 36 is generated. Since the gas pressure is also increased by this arc, the gas pressure of the breaker unit 13 and the sound circuit breaker unit 23 which are faulty increases. This is protection relay 3
If the breaker opening command signal output time from the reference is used as a reference, the gas pressure rises in the breaker unit 13 before the time, and after that, the sounding breaker unit 23
Causes a gas pressure rise.

Accordingly, the outputs of the gas pressures of the respective units detected by the gas pressure sensors S11 to S15 and S21 to S25 and the pressure rise detection units D11 to S15 and D21 to S25
As shown in FIG. 4, the output of the gas pressure sensor S13 for detecting the gas pressure of the circuit breaker unit 13 is the output of the gas pressure sensor S23 for detecting the gas pressure of the circuit breaker unit 23. The gas pressure rises and changes before the output. Therefore, the pressure rise detection unit D13 determines that the gas pressure has risen before the pressure rise detection unit D23, and outputs “1” as a result. Further, changes in the outputs of the gas pressure sensor S13 and the pressure rise detection unit D13 are as follows:
It occurs before the circuit breaker opening command signal output time from the protection relay 3. Since no arc is generated in the units other than the circuit breaker units 13 and 23, the gas pressure of those units does not increase. Therefore, the gas pressure sensor S1
Gas pressure sensors S11, S12, S1 other than 3, S23
The outputs of 4, S15, S21, S22, S24 and S25 do not change. Therefore, the pressure rise detection units D13, D2
Pressure rise detectors D11, D12, D14, D1 other than 3
The outputs of 5, D21, D22, D24, and D25 determine that there is no increase in gas pressure, and output "0" as a result.

For this reason, the first determination unit 7 determines the presence or absence of a gas pressure increase based on the gas pressure detected by each of the gas pressure sensors S13 and S23 of the gas pressure sensor group 4. It receives the outputs of the rise detectors D13 and D23 and receives the circuit breaker opening command signal from the protection relay 3 detected by the protection relay operation detector 6. Accordingly, it is assumed that a gas pressure rise has occurred due to a faulty arc in the unit corresponding to the pressure rise detection unit D13, which has determined that the gas pressure rise has occurred before the circuit breaker opening command signal output time from the protection relay 3; Unit 13
It is determined that a failure has occurred, and the output of the pressure rise detection unit D23, which determines that a gas pressure rise has occurred after the circuit breaker opening command signal output time from the protection relay 3 is ignored, that is, the circuit breaker unit 23 By ignoring the gas pressure rise as being caused by the arc between the contacts when the circuit breaker 36 is opened,
The failure section can be correctly determined to be the breaker unit 13.

In the first judging section 7 shown in FIG. 2, since the breaker unit 13 is out of order, when the circuit breaker opening command signal is outputted from the protection relay 3, the pressure rise detecting section group 5 detects the gas pressure rise. Only the pressure rise detection unit D13 determines that there is an output, and the output is “1”, and the outputs of the other pressure rise detection units D11, D12, D14, D15, and D21 to 25 are “0”. Pressure rise detection unit D1
3, the output of D23 becomes the input of the latch circuit group 71. When the protection relay operation detecting unit 6 input to the clock terminal outputs “1”, that is, when the circuit breaker opening command signal output from the protection relay 3 rises, the latch circuit group 71 outputs the pressure rise detection unit group 5. Pressure rise detectors D13, D2
3 are stored and output. Therefore, as shown in FIG. 4, when the output of the protection relay operation detecting section 6 rises, the output of the latch circuit group L13 becomes "1", and the output of the latch circuit L13 of the latch circuit group 71 becomes "1".
The output of the latch circuit L23 other than 13 becomes “0”, and the failure section can be determined as the latch circuit L13, that is, the circuit breaker unit 13.

In the second judging section 8 shown in FIG. 3, the pressure detecting sections D11, D12, D1 of the pressure rise detecting section group 5 to the input terminals of the gate circuits of the gate circuit group 82 are connected.
The outputs of 4, D15, D21, D22, D24, and D25 are "0". Therefore, there is a breaker opening command signal output from the protection relay 3 to the gate control input terminal of each gate circuit of the gate circuit group 82, and the output from the timer holding circuit 81 via the protection relay operation detection unit 6. "1" for t time
Is input, the output of each gate circuit of the gate circuit group 82 remains “0”, and the input of the clock terminal of each latch circuit of the latch circuit group 83 does not change from “0” to “1”. The output of each latch circuit of the latch circuit group 83 does not change and remains at “0”. Therefore, the second determination unit 8
Determines that there is no failed section. When a failure occurs in the circuit breaker unit 23, similarly to the above, the second determination unit 8 determines that there is no failure section, and the first determination unit 7
Thus, the failure section can be correctly determined as the circuit breaker unit 23.

Next, a case where a failure occurs in a unit other than the circuit breaker units 13 and 23 will be described. Here, the description will be given on the assumption that a ground fault or a short circuit fault has occurred in the instep bus disconnector unit 11 of the gas insulated switchgear 1 in FIG. Due to the breakdown of the Kou bus disconnector unit 11,
The fault current is detected by the current transformers 37 and 38, and the protection relay 3 determines that a fault has occurred inside the gas insulated switchgear 1 or 2 due to the fault current (in this case, the bus protection relay operates), and the breaker unit 13, 23 circuit breakers 35, 36
To the circuit breaker unit 13,
Each of the 23 circuit breakers 35 and 36 is opened. For this reason, the circuit breakers 35 and 36 of the circuit breaker units 13 and 23 are opened by the circuit breaker opening command signal from the protection relay 3, and an arc between the contacts of the circuit breakers 35 and 36 is generated. Increases the gas pressure. Therefore, the gas pressures of the faulty former bus disconnector unit 11 and the sound circuit breaker units 13 and 23 increase. But,
If the gas pressure of the circuit breaker units 13 and 23 is healthy, the gas pressure rises after the time when the circuit breaker opening command signal is output from the protection relay 3 as a reference.

Therefore, the output of the gas pressure of each unit detected by the gas pressure sensors S11 to S15 and S21 to 25 and the output of the result of the judgment that the pressure rise is detected by the pressure rise detection units D11 to D15 and D21 to 25 are shown in FIG. As shown in the figure, the output of the gas pressure sensor S11 for detecting the gas pressure of the instep bus disconnector unit 11 and the circuit breaker units 13, 23
The outputs of the gas pressure sensors S13 and S23 for detecting the gas pressure change in the gas pressure. Therefore, the pressure rise detectors D11, D13, and D23 determine that there is a gas pressure rise, and output "1" as a result. Further, changes in the outputs of the gas pressure sensors S13 and S23 and the pressure rise detection units D13 and D23 occur after the output time of the circuit breaker opening command signal from the protection relay 3. Since no arc is generated in units other than the instep bus disconnector unit 11 and the circuit breaker units 13 and 23, the gas pressure in those units does not increase. Therefore, the gas pressure sensors S11, S
Gas pressure sensors S12, S14, S other than 13, S23
The outputs of 15, S21, S22, S24 and S25 do not change. Therefore, the pressure rise detection units D11, D13, D
Pressure rise detectors D12, D14, D15, D other than 23
Outputs of 21, D22, D24, and D25 output "0" as a result of the determination that there is no increase in gas pressure.

As described above, in the first judging unit 7, as described in the case where the breaker unit 13 has failed, the protection relay 3 outputs the circuit breaker opening command signal after the time. Ignore pressure rise. For this reason, the pressure rise detectors D13 and D13 that have determined that a gas pressure rise has occurred after the circuit breaker opening command signal output time from the protection relay 3 have occurred.
23 is ignored, ie, the circuit breaker units 13, 2
The gas pressure rise of 3 is ignored because it is caused by the arc between the contacts when the circuit breakers 35 and 36 are opened. Therefore, the outputs of the first determination unit 7 are all “0”, and it is determined that there is no failed section.

The second judging section 8 can judge the fault section as the instep bus disconnector unit 11 as follows. Since the circuit breaker opening command signal from the protection relay 3 is input to the timer holding circuit 81 via the protection relay operation detection unit 6, the protection relay operation detection unit 6 outputs "1" when the circuit breaker opening command is output. Is output, and then the timer holding circuit 81 holds and outputs “1” for the time t. Since the output is input to the gate control input terminal of each gate circuit of the gate circuit group 82, the gate circuit group 82
Opens the gate and outputs the input state for the time t. The input terminals of the respective gate circuits of the gate circuit group 82 are connected to the outputs of the respective pressure rise detectors of the pressure rise detector group 5 other than the pressure rise detectors D13 and D23.
During the time t, it is determined that the gas pressure has risen and only "1" is output by the pressure rise detection unit D11 corresponding to the instep bus disconnector unit 11, and the other pressure rise detection units D12, D
The outputs of 14, D15, D21, D22, D24, and D25 are "0", and their output signals are input.

Therefore, among the gate circuits of the gate circuit group 82, only the gate circuit G11 changes the output from "0" to "1", and the other gate circuits G12, G14,
The outputs of G15, G21, G22, G24, G25 remain "0" and do not change. Therefore, among the latch circuits of the latch circuit group 83, the signal of the clock terminal is “0”.
Only the latch circuit M11 changes from “1” to “1”, and the other latch circuits M12, M14, M15, M21, M2
The signals at the clock terminals of M2, M24 and M25 do not change and remain at "0". Therefore, among the latch circuits of the latch circuit group 83, it is the latch circuit M11 that stores and outputs “1” input to the input terminal, and outputs the other latch circuits M12, M14, M15, M21, M22, M24. , M
25 remains “0”. Note that, before the circuit breaker opening command signal is output, the pressure rise detection unit D11 determines that there is a pressure rise, and if “1” is output, the gate control input terminal of the gate circuit of the gate circuit group 82 is When “1” is input, the latch circuit M11 of the latch circuit group 83
Operates, and the latch circuit M11 outputs "1". From the above, the second determination unit 8 determines whether the latch circuit group 8
3, the output of the latch circuit M11 becomes "1", and it is determined that a pressure rise has occurred due to a fault arc in the unit corresponding to the pressure rise detection unit D11, that is, it is determined that a fault has occurred in the instep bus disconnector unit 11, and the fault has occurred. It can be correctly determined that the section is the instep bus disconnector unit 11. In addition, the Kou bus disconnector unit 11 and the circuit breaker units 13 and 23
Similarly, when a failure occurs in a unit other than the above, the first determination unit 7 determines that there is no failure section, and the second determination unit 8 can correctly determine the failure section.

FIGS. 2 and 3 show the case where the gas pressure rises due to the arc between the contacts when the switches such as the circuit breakers 35 and 36 and the disconnectors 31, 32, 33 and 34 are operated normally. Will be described. When the switches such as the circuit breakers 35, 36 and the disconnectors 31, 32, 33, 34 are normally opened and closed, the protection relay 3 does not operate. Therefore, in the first determination unit 7, there is no input to the clock terminals of the latch circuits L13 and L23 of the latch circuit group 71, and the gas pressure rise due to the arc between the contacts when the circuit breakers 35 and 36 are opened and closed. The input terminal of each of the latch circuits L13 and L23 of the latch circuit group 71
Even if an output "1" indicating that the gas pressure has risen is input from the latch circuit group 71, since it is stored and not output.
, The outputs of the output terminals of all the latch circuits L13 and L23 continue to maintain the state "0" before the occurrence of the failure, and it can be determined that there is no failure section. Also, in the second determination unit 8,
The output of the timer holding circuit 81 remains “0”, and the output of each gate circuit of the gate circuit group 82 remains “0” because the gate control input terminal signal is “0” and the gate is not opened. Become. Therefore, each latch circuit of the latch circuit group 83 stores “1” of the input terminal while the signal of the clock terminal remains “0”, and maintains “0” without outputting. Accordingly, a gas pressure rise occurs due to the arc between the contacts when the switches such as the disconnectors 31, 32, 33, and 34 are opened and closed, and the input terminal of each gate circuit of the gate circuit group 82 is connected to the pressure detection unit group 5 Even if an output “1” indicating that the gas pressure has risen is input from, it is ignored and it is determined that there is no failure section.

In the embodiment described above, the case where the substation is constituted by the two gas-insulated switchgears 1 and 2 has been described.
In the case where it is composed of two or more gas insulated switchgears as well as in the case where it is composed of one gas insulated switchgear, similarly, the failure occurring in the gas compartment of each unit is detected and the failure compartment is correctly detected. Can be determined.

[0032]

As described above, according to the present invention, a gas pressure rise due to a failed arc before the start of opening of the breaker by the breaker opening command signal from the protection relay is detected, and the contact at the time of opening of the breaker is detected. The gas pressure rise due to the inter arc is neglected. Therefore, the gas pressure rise due to the failed arc and the gas pressure rise due to the arc between the contacts when the circuit breaker is opened are distinguished, and the gas compartment of the healthy unit is not determined to be the failed compartment, and the gas compartment of the failed unit is designated as the failed compartment. Can be correctly determined. In addition, since the fault compartment is determined based on the protection relay operating conditions, even if the gas pressure rises due to an arc when opening or closing a switch such as a circuit breaker or disconnector when the protection relay does not operate normally, the gas compartment is not affected. Is not determined as a failed section, and erroneous determination can be prevented.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of a first determination unit of the present invention.

FIG. 3 is a diagram illustrating an example of a second determination unit of the present invention.

FIG. 4 is a diagram for explaining the operation of the present invention.

FIG. 5 is a diagram for explaining the operation of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas insulated switchgear 2 Gas insulated switchgear 3 Protection relay 4 Gas pressure sensor group S11-15 Gas pressure sensor S21-25 Gas pressure sensor 5 Pressure rise detection group D11-15 Pressure rise detection part D21-25 Pressure rise detection part Reference Signs List 6 protection relay operation detecting section 7 first determining section 71 latch circuit group L13, L23 latch circuit 8 second determining section 81 timer holding circuit 82 gate circuit group G11, G12, G14, G15 gate circuit G21, G22, G24, G25 Gate circuit 83 Latch circuit group M11, M12, M14, M15 Latch circuit M21, M22, M24, M25 Latch circuit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01H 33/26 H01H 33/00 H01H 9/50 H02B 13/06

Claims (1)

(57) [Claims] 1. A gas pressure sensor provided in each gas section of a gas insulated switchgear having a plurality of gas sections, and detecting a gas pressure of the gas section. A pressure rise detection section for detecting a pressure rise, a protection relay operation detection section for detecting a circuit breaker opening command signal or a protection relay operation signal from the protection relay; and a failure detection from the protection relay operation detection section, and When the pressure rise detection unit corresponding to the gas compartment in which the circuit breaker is stored in the gas compartment outputs an output indicating that the gas pressure has risen before the circuit breaker opening start time according to the circuit breaker opening command signal from the protection relay. A first determination unit that determines that the gas section corresponding to the pressure rise detection unit that has output the gas pressure rise is a failure section; and that the protection relay operation detection unit determines that there is a failure. Out, and when the pressure rise detection unit corresponding to the gas compartment in which the device other than the circuit breaker in the gas compartment is stored, outputs a signal indicating that there is a gas pressure rise, the pressure rise detection unit that outputs that gas pressure has risen And a second determination unit that determines a gas section corresponding to the failure section as a failure section. A failure section detection device for a gas insulated switchgear, comprising: