JP3130212B2 - 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 for performing a primary test of a through current transformer.

[0002]

2. Description of the Related Art FIG. 6 is a single-line diagram of a general gas insulated switchgear, and FIG. 6 and 7, 1 is a bus, 11a, 11b, 12a, 12b are disconnectors, 21a, 21b, 21c, 22a, 22b, 2
2c is a current transformer, 31, 32 are circuit breakers, 41a, 41b,
42a and 42b are grounding devices. Disconnectors 11a, 11
b, the current transformers 21a, 21b, 21c, the circuit breaker 31, and the grounding devices 41a, 41b constitute the line unit 100. Disconnectors 12a, 12b, current transformers 22a, 22
b, 22c, circuit breaker 32 and grounding devices 42a, 42b
Constitutes the track unit 200. One of the line units 100 and 200 is connected to the bus 1, and the other is connected to terminals 51 and 52, respectively. Further, a transformer 60 is connected to the terminal 52.

[0003] Reference numeral 71 denotes a tank accommodating the bus 1, in which an insulating gas is sealed. 72 denotes disconnectors 11a and 11b, current transformers 21a and 21b, circuit breaker 31, and grounding device 41.
a and 41b are housed therein and connected to the tank 71 via an insulating spacer 71a, in which an insulating gas is sealed.
Reference numeral 73 denotes a tank connected to the ground side of the grounding device 41a and connected to the tank 72 via an insulating spacer 73a, and is filled with an insulating gas. Reference numeral 74 denotes a tank connected to the ground side of the grounding device 41b and connected to the tank 72 via an insulating spacer 74a, and is filled with an insulating gas. Reference numeral 75 denotes a tank containing the current transformer 21c and connected to the tank 72 via an insulating spacer 75a, in which an insulating gas is sealed. In addition, the terminal 51 consisting of a tank 75 and a bushing
Are connected via an insulating spacer 75b.

[0004] 76 is a disconnector 12a, 12b, the current transformer 22
a, 22b, circuit breaker 32 and grounding devices 42a, 42b
And is connected to the tank 71 via an insulating spacer 76a, and is filled with an insulating gas. Reference numeral 77 denotes a tank connected to the ground side of the grounding device 42a and connected to the tank 76 via an insulating spacer 77a, in which an insulating gas is sealed. Reference numeral 78 denotes a tank connected to the ground side of the grounding device 42b and connected to the tank 76 via an insulating spacer 78a, and is filled with an insulating gas.

A tank 79 houses a conductor 80 connecting the disconnector 12b and the current transformer 22c, and is connected to the tank 76 via an insulating spacer 79a. The tank 79 is filled with insulating gas. 81 is an insulating spacer 81 for accommodating the current transformer 22c.
The insulating gas is sealed in a tank connected to the tank 79 via a. Reference numeral 82 denotes a penetrator made of a conductive member penetrating the current transformer 22c, and a side near the disconnector 12b is electrically connected to the tank 81. 83 accommodates the bushing 60a of the transformer 60 and the terminal 52 and accommodates the insulating spacer 8
In the tank connected to the tank 81 via 3a, a manhole 84 is provided corresponding to the connection between the terminal 52 and the bushing 60a. Reference numeral 85 denotes a lid that closes the manhole 84 in cold weather. Note that the tank 83 is an insulating spacer 83b.
And the tank of the transformer 60 is connected to the tank through which the insulating gas is sealed.

Insulating spacers 73a and 74a are provided between the tank 72 and the tanks 73 and 74, respectively, and insulating spacers 77a and 78 are provided between the tank 76 and the tanks 77 and 78, respectively.
a and insulated and fixed. Further, an insulating spacer 79a is provided between the tank 76 and the tank 79, and an insulating spacer 81a is provided between the tank 79 and the tank 81.
An insulating spacer 83a is provided between the tank and the tank 83 so as to be insulated and fixed to each other. Reference numerals 86a to 86l denote grounding bars, respectively, between the tanks 71 and 72 and between the tanks 72 and 73.
Between the tanks 72 and 74, between the tank 75 and the terminal 51, between the tanks 71 and 76, between the tanks 76 and 77, between the tanks 76 and 78, between the tanks 76 and 79, and between the tanks 79 and 81.
Between the tanks 81 and 83, and between the tank 83 and the transformer 60.
Is electrically connected to the tank.

[0007] The steepness test performed when a power station or a substation constructed as described above is newly installed or expanded is performed after various devices are installed in a predetermined place on the site and before starting use. Is performed. As a test of the power system protection circuit,
There are unit tests (commonly known as secondary tests) and union tests (commonly known as primary tests). In the primary test, a test current is supplied to the primary side of the current transformer, and a comprehensive performance test is performed to determine whether the secondary side functions normally.

FIG. 8 is a general configuration diagram in the case where a primary test is performed by applying a current to the penetrating primary conductors of the current transformers 22a and 22b. In FIG. 8, the tank 77 is grounded by a ground line 87a. Reference numeral 88 denotes a power supply device having one terminal connected to the tank 78 and the other end grounded by a ground line 87b.
A predetermined current is supplied to the primary conductors a and 22b.

When performing a primary test of the current transformers 22a and 22b in the above configuration, the grounding bars 86f and 86g are removed, and the disconnectors 12a and 12b are opened. And
By closing the grounding devices 42a and 42b and the circuit breaker 32, the power supply 88-tank 78-grounding device 42b
-Circuit breaker 32-Grounding device 42a-Tank 77-Grounding wire 8
7a and 87b, the current transformer 22
a, 22b, the current transformers 22a, 22b
The primary test of 2b can be performed.

In the test of the current transformers 21a and 21b shown in FIG. 7, the grounding bars 86b and 86 are used similarly to the current transformers 22a and 22b.
c, and disconnectors 11a and 11b are opened.
Then, by closing the grounding devices 41a and 41b and the circuit breaker 31, the power supply device 8 is placed between both tanks 73 and 74.
8, the primary tests of the current transformers 21a and 21b can be performed.

In the test of the current transformer 21c shown in FIG. 7, the grounding bar 86g is removed, and the disconnector 12b and the grounding device 4 are removed.
1a, 41b and 42a are kept open. Then, the grounding device 42b, the circuit breakers 31, 32, and the disconnectors 11a, 11
By closing the terminals b and 12a and grounding the terminal 51, a current can flow from the power supply 88 connected between the tank 78 and the ground.

FIG. 9 is a block diagram showing a case where a primary test of the current transformer 22c is performed. In FIG. 9, the ground bar 86g is removed. After recovering the insulating gas in the tank 83, the lid 85 is opened, the terminal 52 is removed, the transformer 60 is cut off, and grounding is performed with the ground wire 87c. In the above configuration, the circuit breaker 32 is opened, and the grounding device 42b and the disconnector 12b are opened.
Close. As a result, the power supply device 88-tank 78-
Grounding device 42b-disconnector 12b-conductor 80-grounding line 87
c, the current can flow through the current transformer 22c.
The primary test of

FIG. 10 shows a case in which the current transformers 21c and 22c are combined and a current relay or a voltage differential relay is operated by a current output from the current transformers 21c and 22c to perform a primary butting test for protecting a substation bus. It is performed by the circuit of FIG.

In FIG. 10, grounding bars 86f, 86g
And remove the bushing terminal 51 to the ground line 87.
Ground at d. Further, the terminal 52 is removed and the ground wire 8 is removed.
The conductor 80 is grounded at 7c. And the tanks 77 and 78
The power supply 88 is connected between them. Here, the circuit breaker 32 and the grounding devices 41a, 41b are opened to disconnect the disconnectors 11a, 1b.
1b, 12a, 12b, circuit breaker 31, and grounding device 42
By closing the power supply device 88, the tank 77, the grounding device 42a, the disconnector 12a, the bus 1, the disconnector 11a, the circuit breaker 31, the disconnector 11b, the terminal 51, the ground wires 87d, 87c, and the conductors 80, 42a and 42b. The circuit of the disconnector 12b, the grounding device 42b, the tank 78, and the power supply device 88 is configured. In the above-described circuit configuration, a primary test can be performed by supplying a current from the power supply device 88 to both current transformers 21c and 22c.

[0015]

Since the conventional gas insulated switchgear is constructed as described above, the terminal 52 is removed while the lid 85 of the manhole 84 is open when the current transformer is tested. Above, the ground line 87c must be connected to the conductor 80. Therefore, when the installation is completed on site and the insulating gas is sealed in the tank 83, the insulating gas in the tank 83 is recovered once, the lid 85 of the manhole 84 is opened, and then the ground wire 87c is connected. I do. Further, since the insulating gas is not sealed in the tank 83, the conductor 80 and the bushing 60 of the transformer 60 are connected at the terminal 52.
The conductor 80 and the ground line 87c are connected even before the connection with the conductor a. Then, when the test is completed, the ground wire 87c is removed, and the conductor 80 and the bushing 60a of the transformer 60 are connected by the terminal 52. Further, since it is necessary to close the lid 85 of the manhole 84 and then fill the inside of the tank 83 with the insulating gas, there is a problem that the procedure of the current transformer test and the procedure of the assembly work are troublesome.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a gas insulated switchgear capable of performing a primary test of a current transformer with an insulating gas in a tank sealed. is there.

[0017]

According to the present invention, one terminal of a first circuit breaker is connected to a bus via a first disconnector, and a second disconnection is performed from the other terminal of the first circuit breaker. Vessel and first
A first grounding device to one terminal of the first circuit breaker, a second grounding device to the other terminal, and a second circuit breaker. Of the second circuit breaker is connected to the second terminal via the fourth disconnector and the second current transformer from the other terminal of the second circuit breaker. Then, a third grounding device is connected to one terminal of the second circuit breaker, and a fourth grounding device is connected to the other terminal. The present invention relates to a gas insulated switchgear for performing a primary test.

According to a first aspect of the present invention, the fourth disconnector side of the penetrating member made of a conductive member penetrating the second current transformer is connected to the first tank containing the second current transformer. The other side of the fourth grounding device is led out of the first tank through a bushing, and the grounding side of the fourth grounding device is insulated from the second tank containing the fourth grounding device. Connected to the tank
The first terminal and the bushing are grounded so that a power supply device can be connected between the first tank and the third tank.

According to a second aspect of the present invention, the fourth disconnector side of the penetrating member made of a conductive member penetrating the second current transformer is connected to the first tank containing the second current transformer. The other side of the fourth grounding device is led out of the first tank through a bushing, and the grounding side of the fourth grounding device is insulated from the second tank containing the fourth grounding device. Connected to the tank
The first terminal is grounded, the first tank and the second tank are connected, and a power supply device can be connected between the bushing and the first terminal via the ground.

According to a third aspect of the present invention, the fourth disconnector side of the second current transformer is led out from the first tank of the second current transformer to the outside via the first bushing. The other side of the current distributor, which is opposite to the fourth disconnector, is led out of the first tank through the second bushing, and both bushings are connected to each other by a connection line passing through the second current transformer. The grounding side of the grounding device is connected to a third tank insulated from the second tank accommodating the fourth grounding device, the first terminal and the second bushing are grounded, and the first bushing and the second bushing are grounded. A power supply device can be connected to the third tank.

[0021]

According to the first aspect of the present invention, the fourth disconnector side of the penetrating member made of a conductive member penetrating the second current transformer is connected to the second disconnector.
And the other end of the penetrator, which is opposite to the fourth disconnector, is led out of the first tank via a bushing, and the grounding side of the fourth grounding device is connected to the first tank. A fourth tank is connected to a third tank insulated from the second tank containing the fourth grounding device, the first terminal and the bushing are grounded, and a power supply is provided between the first tank and the third tank. Since the connection can be made, a primary test can be performed by passing a current from the power supply device to the primary side of the first current transformer and the second current transformer.

According to the second aspect of the present invention, the fourth disconnector side of the penetrating member made of a conductive member penetrating the second current transformer is connected to the first tank containing the second current transformer. The other side of the penetrating body, which is opposite to the fourth disconnector, is led out of the first tank through the bushing, and the grounding side of the fourth grounding device is connected to the fourth side.
Connected to a third tank insulated from the second tank accommodating the grounding device, grounding the first terminal, connecting the first tank to the second tank, and connecting the bushing to the first terminal. So that the power supply can be connected via ground between
A primary test can be performed by applying a current from the power supply device to the primary side of the first current transformer and the second current transformer.

According to a third aspect of the present invention, the fourth disconnector side of the second current transformer is led out from the first tank of the second current transformer to the outside via the first bushing. The other side of the current transformer from the first tank is led out from the first tank via the second bushing, and both bushings are connected by a connection line passing through the second current transformer; Connect the ground side of the fourth grounding device to the fourth
A third tank insulated from the second tank accommodating the first grounding device, the first terminal and the second bushing are grounded, and a power supply device is provided between the first bushing and the third tank. Can be connected, so that a primary test can be performed by passing a current from the power supply device to the primary side of the first current transformer and the second current transformer.

[0024]

【Example】

Embodiment 1 FIG. FIG. 1 shows a butt 1 of the current transformers 21c and 22c.
FIG. 2 is a configuration diagram of a main part of FIG. 1 for performing a next test. 1 and 2, the components having the same reference numerals as those in the related art are the same as those in the related art. 89 is tank 81
, One is grounded by a ground line 87e, and the other is connected to a side of the penetrating body 82 that has penetrated the current transformer 22c and is opposite to the fourth disconnector 12b. The power supply 88 is connected between the tanks 78 and 79.

In the above configuration, the grounding bars 86g, 86
h, 86j, and remove tanks 71, 72, 75, 7
Remove the ground wire (not shown) between 6,79,81 and the ground. Disconnector 12b and grounding devices 41a, 41b,
42a is kept open. Then, the terminal 51 is connected to the ground line 87d.
To ground and disconnectors 11a, 11b, 12a, circuit breaker 3
1, 32 and the grounding device 42b are closed. As a result, the power supply device 88, the tank 78, the grounding device 42b, the circuit breaker 32, the disconnector 12a, the bus 1, the disconnector 11a, the disconnector 31, the disconnector 11b, the terminal 51, and the ground lines 87d, 87e.
A circuit consisting of a bushing 89, a penetrating body 82, a tank 81, a ground bar 86 i, a tank 79, and a power supply 88 is formed, and a current flows from the power supply 88 to the primary side of the current transformers 21 c and 22 c.

As described above, according to the configuration of the first embodiment, there is no need to open the lid 85 of the manhole 84, and the grounding bars 86g, 86h, 86j are removed outside each tank.
By connecting the ground wires 87d and 87e and the power supply 88, a primary test of the current transformers 21c and 22c can be performed.

Embodiment 2 FIG. FIG. 3 is a configuration diagram of a second embodiment for performing a primary butt test of the current transformers 21c and 22c. In FIG. 3, a power supply device 88 includes a bushing 89 and a terminal 51.
And ground lines 87d and 87e. The tanks 78 and 79 are connected by a connection line 90. As a result, the power supply 88-bushing 8
9-Penetrator 82-Tank 81-Ground bar 86i-Tank 79-Connection line 90-Tank 78-Grounding device 42b-Circuit breaker 32-Disconnector 12a-Busbar 1-Disconnector 11a-Circuit breaker 31-Disconnector 11b- Terminal 51-grounding lines 87d, 87e
-The circuit of the power supply device 88 is formed, and the current flows from the power supply device 88 to the primary side of the current transformers 21c and 22c.

As described above, according to the configuration of the second embodiment, there is no need to open the lid 85 of the manhole 84, and the grounding bars 86g, 86h, 86j are removed outside each tank.
Further, by connecting the ground wires 87d and 87e and the power supply 88, the butting of the current transformers 21c and 22c is performed.
The next test can be performed.

Embodiment 3 FIG. FIG. 4 is a configuration diagram of a third embodiment for performing a primary butt test of the current transformers 21c and 22c, and FIG. 5 is a configuration diagram of a main part of FIG. 4 and 5, 9
Reference numeral 1 denotes a bushing led out of the tank 81 on the disconnector 12b side of the current transformer 22c, and reference numeral 92 denotes a connection line passing through the current transformer 22c and connects the two bushings 89 and 91. Reference numeral 93 denotes a connection line connecting the bushing 91 and the tank 79. Then, the power supply device 88 is connected to the tanks 78 and 79.
Connected between them.

In the above configuration, the grounding bars 86g, 86
h, 86i, 86j are removed, and the disconnecting switch 12b and the grounding devices 41a, 41b, 42a are opened. And
The disconnectors 11a, 11b, 12a, the circuit breakers 31, 32, and the grounding device 42b are closed. Thereby, the power supply 8
8-Tank 78-Grounding device 42b-Circuit breaker 32-Disconnector 12a-Bus 1-Disconnector 11a-Circuit breaker 31-Disconnector 1
1b-terminal 51-ground wire 87d, 87e-bushing 8
9-connection line 92-bushing 91-connection line 93-tank 79-power supply device 88
, A current flows to the current transformers 21c and 22c.

In the above, the power supply device 88 may be connected between the bushing 89 and the ground as in the second embodiment.
As described above, according to the configuration of the third embodiment, the manhole 84
It is not necessary to open the lid 85 of the current transformers 21c and 22c by removing the grounding bars 86g, 86h, 86i and 86j outside of each tank and connecting the grounding wires 87d and 87e and the power supply 88. The next test can be performed.

[0032]

According to the first aspect of the present invention, the fourth disconnector side of the penetrator made of a conductive member penetrating the second current transformer is connected to the second disconnector.
And the other end of the penetrator, which is opposite to the fourth disconnector, is led out of the first tank via a bushing, and the grounding side of the fourth grounding device is connected to the first tank. A fourth tank is connected to a third tank insulated from the second tank containing the fourth grounding device, the first terminal and the bushing are grounded, and a power supply is provided between the first tank and the third tank. Since the connection can be made, only the work outside the tank of each device is required, so that the current transformer test can be easily performed without obstructing the installation procedure.

According to the second aspect of the present invention, the fourth disconnector side of the penetrating member made of a conductive member penetrating the second current transformer is connected to the first tank containing the second current transformer. 4th penetrator
The other side of the disconnecting device is led out of the first tank via a bushing, and the grounding side of the fourth grounding device is connected to a third tank insulated from the second tank containing the fourth grounding device. Connection, the first terminal is grounded, the first tank is connected to the second tank, and the power supply can be connected between the bushing and the first terminal via the ground. Since only work outside the tank of the equipment is required, the current transformer test can be facilitated without obstructing the installation procedure.

According to the third aspect of the present invention, the first bushing is connected from the first tank of the second current transformer to the fourth disconnector side of the penetrator made of a conductive member penetrating the second current transformer. And the other side of the second current transformer, which is opposite to the fourth disconnector, is led out of the first tank via the second bushing, and the second current transformer is provided between the two bushings. And a grounding side of the fourth grounding device is connected to a third tank insulated from the second tank housing the fourth grounding device,
Since the first terminal and the second bushing are grounded so that the power supply device can be connected between the first bushing and the third tank, it is only necessary to work outside the tank of each device. Therefore, the current transformer test can be easily performed without obstructing the procedure of the installation work.

[Brief description of the drawings]

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

FIG. 2 is a configuration diagram illustrating a main part of FIG. 1;

FIG. 3 is a configuration diagram showing a second embodiment of the present invention.

FIG. 4 is a configuration diagram showing a third embodiment of the present invention.

FIG. 5 is a configuration diagram showing a main part of FIG. 4;

FIG. 6 is a single-line diagram of a general gas-insulated switchgear.

FIG. 7 is a configuration diagram of a conventional gas insulated switchgear.

FIG. 8 is a configuration diagram illustrating a test circuit of a current transformer.

FIG. 9 is a configuration diagram illustrating a test circuit of a current transformer.

FIG. 10 is a configuration diagram illustrating a current-matching test circuit.

[Explanation of symbols]

1 busbar, 11a, 11b, 12a, 12b disconnector,
21c, 22c Current transformer, 31, 32 Circuit breaker, 41
a, 41b, 42a, 42b Grounding device, 51, 52
Terminal, 76, 78, 81 Tank, 82 Penetrator, 88
Power supply, 89, 91 bushing, 92 connection line.

Claims (3)

(57) [Claims] 1. A first circuit breaker is connected from one terminal to a bus via a first disconnector, and the other terminal of the first circuit breaker is connected to a second disconnector and a first current transformer. A first grounding device to one terminal of the first circuit breaker, a second grounding device to the other terminal, and a second grounding device.
From one terminal of the circuit breaker to the bus via a third disconnector, and from the other terminal of the second circuit breaker to the fourth terminal via a fourth disconnector and a second current transformer. 2 terminal,
A third grounding device is connected to one terminal of the second circuit breaker and a fourth grounding device is connected to the other terminal of the second circuit breaker. In the gas insulated switchgear for performing the primary test of the above, the second current transformer is housed on the fourth disconnector side of a penetrating body made of a conductive member penetrating the second current transformer. A fourth tank is connected to a first tank, and a side of the penetrator opposite to the fourth disconnector is led out of the first tank via a bushing, and a grounding side of the fourth grounding device is connected to the fourth tank. The first terminal and the bushing are connected to the third tank insulated from the second tank accommodating the grounding device, and the first terminal and the bushing are grounded. A gas insulated switchgear, wherein a power supply device can be connected. 2. A first breaker is connected from one terminal to a bus via a first disconnector, and the other terminal of the first breaker is connected to a second disconnector and a first current transformer. A first grounding device to one terminal of the first circuit breaker, a second grounding device to the other terminal, and a second grounding device.
From one terminal of the circuit breaker to the bus via a third disconnector, and from the other terminal of the second circuit breaker to the fourth terminal via a fourth disconnector and a second current transformer. 2 terminal,
A third grounding device is connected to one terminal of the second circuit breaker and a fourth grounding device is connected to the other terminal of the second circuit breaker. In the gas insulated switchgear for performing the primary test of the above, the second current transformer is housed on the fourth disconnector side of a penetrating body made of a conductive member penetrating the second current transformer. A fourth tank is connected to a first tank, and a side of the penetrator opposite to the fourth disconnector is led out of the first tank via a bushing, and a grounding side of the fourth grounding device is connected to the fourth tank. The first terminal is grounded, the first tank is connected to the second tank, and the bushing is connected to the second tank containing the grounding device. The power supply device can be connected to the first terminal via a ground. Gas insulated switchgear. 3. A terminal connected to a bus from a first terminal of the first circuit breaker via a first disconnector, and a second disconnector and a first current transformer from the other terminal of the first circuit breaker. A first grounding device to one terminal of the first circuit breaker, a second grounding device to the other terminal, and a second grounding device.
From one terminal of the circuit breaker to the bus via a third disconnector, and from the other terminal of the second circuit breaker to the fourth terminal via a fourth disconnector and a second current transformer. 2 terminal,
A third grounding device is connected to one terminal of the second circuit breaker and a fourth grounding device is connected to the other terminal of the second circuit breaker. In the gas insulated switchgear, the first disconnection of the second current transformer is connected to the first disconnector of the second current transformer.
From the tank through the first bushing,
The other side of the second current transformer opposite to the fourth disconnector is led out of the first tank via a second bushing, and penetrates between the two bushings through the second current transformer. And a grounding side of the fourth grounding device is connected to a third tank insulated from a second tank containing the fourth grounding device, and the first terminal and the second terminal are connected to each other. A gas insulated switchgear, wherein the power supply device is connected between the first bushing and the third tank.