JP2596153Y2 - 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 installed in an electric station such as a substation.

[0002]

BACKGROUND OF THE INVENTION Generally in a gas insulated switchgear, circuit breakers, disconnectors, grounding switches, such as the bus conductor, the necessary devices constituting the opening and closing circuit of electric station, a plurality of metals SF ₆ gas is sealed It has a structure in which it is appropriately divided and stored in a container, and the plurality of metal containers are connected in a gas-separated state via an insulating spacer.

FIG. 3 shows an example of the configuration of a gas insulated switchgear having the configuration shown in the single-line diagram of FIG. 4. In FIG. 3, reference numeral 1 denotes a cable head container formed in a cylindrical shape; A gantry for supporting the container 1. One end of a connection conductor container 4 is connected to a branch pipe portion 1 a provided on a side surface of the cable head container 1 via an insulating spacer 3.
Is connected to one end of a disconnector container 6 via an insulating spacer 5. A lightning arrester container 7 is arranged below the connection conductor container 4, and the lightning arrester container is supported on a mounting base 8 via a mount 9. The lightning arrester container 7 has an opening at an upper end, and the opening is connected to a branch pipe portion 4 a provided at a lower portion of the connection conductor container 4 via an insulating spacer 10.

The other end of the disconnector container 6 is provided with an insulating spacer 11.
The other end of the connection conductor container 12 is connected to the branch pipe portion 14 a provided on the upper side surface of the circuit breaker container 14 via the insulating spacer 13. The disconnector container 1 is connected to the branch pipe portion 14b provided on the lower side surface of the circuit breaker container 14 via the insulating spacer 15.
6, a busbar container 17 having a flange provided at the lower portion of the disconnector container 16 supported on the installation base 8.
Is connected via an insulating spacer 18 to the upper end opening of the branch pipe portion 17a.

Each of the above-mentioned containers is made of metal, and SF ₆ gas is sealed therein at a predetermined pressure.

In the cable head container 1, three-phase cable heads CHd are arranged with their respective central axes oriented vertically, and terminals 20 provided at the upper ends of the respective cable heads are connected via connection conductors 21. The insulating spacer 3 is connected to the through conductor 3a. Conductor connection portions 22 are provided on the upper portions of the three-phase connection conductors 21, and these conductor connection portions are opposed to a lid plate 1 </ b> A that closes an upper end opening of the container 1.

[0007] The cable head CHd is connected to a terminal of the power cable C that is set up from an underground cable pit, and a current transformer CT is mounted near the terminal of the cable C.

In the connection conductor container 4, a three-phase connection conductor 23A for connecting between the through conductor 3a of the insulating spacer 3 and the through conductor 5a of the insulating spacer 5 is accommodated.
A is a lightning arrestor L housed in a lightning arrester container 7 via a through conductor 10 a of an insulating spacer 10.
A is connected.

In the disconnector container 6, a line-side disconnector DSL is provided.
And the grounding switch ESL are accommodated for three phases, and the through conductor 5a of the insulating spacer 5 and the through conductor 1 of the insulating spacer 11 are accommodated.
1a is connected via a disconnector DSL. The grounding switch ESL is provided between the terminal on the insulating spacer 5 side of the disconnecting switch DSL and the ground.

In the connection conductor container 12, the insulating spacer 1 is provided.
1 through-conductor 11a and through-conductor 13 of insulating spacer 13
a, and a breaker inspection grounding switch ES1 for grounding one end of the circuit breaker described later via the connection conductor 24 are housed.

In the circuit breaker container 14, a three-phase circuit breaker CB
Are arranged with their respective central axes oriented vertically, and one end and the other end of the circuit breaker of each phase are respectively connected to the connection conductor 2.
5 and 26 are connected to the through conductors 13a and 15a of the insulating spacers 13 and 15, respectively. Disconnector container 16
The bus-side disconnector DSB and the grounding switch ES2 for checking the circuit breaker are housed therein, and the bus-side disconnector DSB connects between the through conductor 15a of the insulating spacer 15 and the through conductor 18a of the insulating spacer 18. Have been. Switch E for grounding
S2 is provided between the terminal on the insulating spacer 15 side of the disconnector DSB and the ground.

A bus conductor 30 constituting a three-phase bus BUS is housed in the bus container 17, and the bus conductor of each phase is connected to a disconnector DSB via a through conductor 18 a of an insulating spacer 18. The bus conductor 30 extends in a direction perpendicular to the plane of the drawing and is connected to a bus conductor of another adjacent gas insulated switchgear.

An operation box 31 is provided beside the circuit breaker container 14.
Are arranged, and an operation device of the circuit breaker CB is disposed in the operation device box.

[0014]

In the gas insulated switchgear, it is necessary to perform a withstand voltage test on the power cable C in order to verify the insulation performance of the power cable C. Since the power cable is long and has a large electrostatic capacitance to the ground, if you try to perform a withstand voltage test by applying a commercial frequency AC voltage,
The capacity of the test transformer becomes too large. Therefore, the withstand voltage test of the power cable is performed by applying a DC voltage. On the other hand, since the gas insulated switchgear is designed to be insulated with respect to the AC voltage, it is necessary to avoid applying DC voltage to the components of the gas insulated switchgear as much as possible.

In the gas insulated switchgear having the configuration shown in FIG. 3, the DC withstand voltage test of the cable is performed in different procedures according to the voltage class. For example, 8
In the case of applying a DC test voltage to the cable C from its own end (the end connected to the cable head of the gas-insulated switchgear shown) in the 4 KV gas-insulated switchgear, first, the line-side disconnector DSL and Open the earthing switch ESL and collect the gas in containers 1 and 4. Next, the connection conductor 2 is passed through a hand hole (not shown) provided in the container 4.
The connection conductor 23B connecting 3A and the lightning arrester LA is removed. Thereafter, the cover plate 1A of the cable head container 1 is removed, a test bushing is attached to the upper portion of the cable head container 1, and the center conductor of the bushing is connected to the conductor connection portion 22. After evacuating the containers 1 and 4, the gas is sealed up to a predetermined pressure. The test bushing is connected to a test DC power supply, and a DC test voltage is applied to the power cable C through the cable head CHd.

In the case of applying a test voltage to the cable C from its own end in a gas insulated switchgear of 168 KV or more, the gas in the container 1 is charged so as not to apply a DC voltage to the insulator of the gas insulated switchgear. After the collection, the lid plate 1c closing the branch pipe portion 1b provided on the side surface of the container 1 is opened,
A connection conductor 2 connecting between the cable head and the through conductor of the insulating spacer 3 through the opening of the branch pipe portion 1b.
Remove 1 Thereafter, a test bushing is directly connected to the terminal of the cable head CHd, and a DC test voltage is applied to the cable C.

In the 84 KV gas insulated switchgear, the disconnecting switch DSL and the earthing switch ESL are opened and the connecting conductor 23 is opened.
When a test bushing is connected to the conductor connection portion 22 and a DC test voltage is applied with B removed, the DC test voltage is applied to the insulating spacers 3 and 5.
However, when a DC test voltage is applied to the insulator,
Corona discharge in insulators when voids such as
This is not preferable because insulation occurs and insulation deterioration occurs. In this case, the cable head container 1 and the connection conductor container 4
Since it is necessary to perform both gas treatments (recovery and refilling of gas), the operation is time-consuming and troublesome.

In the case of a gas insulated switchgear of 168 KV or more, since the connecting conductor 21 is removed, the conductor connecting portion 22 cannot be used, and another connection for connecting a test bushing to the cable head CHd is required. There is a problem that a conductor having a conductor connection portion must be prepared.

In an 84 KV gas insulated switchgear, a test voltage may be applied from the other end (the other end) of the cable C. In this case, too, the line-side disconnector DS
Since the test voltage was applied with the L and ground switch ESL opened and the connection conductor 23B removed, the DC voltage was applied to the insulating spacers 3 and 5 as in the case of performing the test from its own end. There was a problem.

In a gas insulated switchgear of 168 KV or more, a test voltage may be applied from the other end of the cable C with the connection conductor 21 removed, but also in this case, the test is performed from its own end. There was a problem.

In order to solve the above problems, a gas insulated switchgear shown in FIG. 5 has been proposed. A single-line diagram of this gas insulated switchgear is as shown in FIG. In this gas insulated switchgear, a simple disconnecting portion DSo is provided between the terminal of the cable head CHd and the connecting conductor 21 connected to the through conductor 3a of the insulating spacer 3. The simple disconnecting portion DSo includes a fixed electrode 35 attached to the terminal of the cable head CHd, and a linearly displaceable movable electrode 36 attached to the connection conductor 21, and an insulating operation rod 37 for operating the movable electrode 36 is provided. It is connected to an operation shaft 39 via an operation mechanism 38. The operating shaft 39 is led out of the cable head container 1, and when the operating shaft 39 is operated, the movable electrode 36 is closed as shown in FIG. The linear displacement can be made between the open position and the open position. Other points are the same as those in the example shown in FIG.

As shown in FIG. 5, when the simple disconnecting portion DSo is provided, the test voltage can be applied from the other end of the cable without performing gas treatment by opening the simple disconnecting portion DSo. In that case, no DC test voltage is applied to the insulator on the gas insulated switchgear side. However, in this case, there is a problem that the DC withstanding voltage test cannot be performed from the own end side of the cable.

Therefore, as shown in FIGS. 7 and 8, after providing the simple disconnecting portion DSo, the conductor connecting portion 40 for applying a test voltage is connected to the end of the connecting conductor 21 connected to the through conductor of the insulating spacer 3. The gas-insulated switchgear provided with 'has been proposed. The conductor connection portion 40 'is provided so as to face a cover plate 1c that closes an opening of a branch pipe portion 1b provided on a side surface of the cable head container 1, and is connected to the conductor connection portion 40 with the cover plate 1c removed. A terminal of a transfer cable for applying a test voltage or a bushing for applying a test voltage can be connected. Other points of the gas insulated switchgear of FIG. 7 are the same as those of the gas insulated switchgear of FIG.

In the gas insulated switchgear shown in FIG. 7, by opening the simple disconnecting portion DSo, the cable C is connected without performing gas treatment and without applying a DC voltage to the insulator of the gas insulated switchgear. , A DC test voltage can be applied from the other end. However, conductor connection 4
When the test voltage is applied from the end of the cable using the zero, the DC voltage is applied to the insulating spacers 3 and 5, as in the case of the gas insulated switchgear shown in FIG. was there.

The micro-fiber of Japanese Utility Model Application No. 1-15099 is disclosed.
As shown in the film, the cable head container and the
Connected to cable head container via insulating spacer
Gas insulated switchgear with other containers
Cable head for test voltage application
And for applying test voltage to cable head terminals
Between the terminal of the cable head and the terminal of the cable head
And the through conductor provided on the insulating spacer, respectively.
Provide a disconnection part and connect the cable head terminals and insulating spacers.
Open the disconnection between the through conductor and the end of the cable head.
Disconnection between terminal and terminal of cable head for applying test voltage
With the section closed, connect the cable head for applying the test voltage.
And apply a DC test voltage to the power cable.
Have been proposed.

According to this proposed device, the cable head
Power cable without gas treatment inside the container.
A voltage test can be performed. However, this existing
With the proposed gas insulated switchgear, two
Need to provide two disconnecting parts, the cable head capacity
The circuit configuration inside the vessel becomes complicated and the weight increases.
However, there was a problem that the cost was high.

Further, in the gas insulated switchgear already proposed,
Apply a DC test voltage to the cable from the other end of the cable
Cable head for applying test voltage when performing voltage test
Test voltage is applied to the insulation operation rod at the
It didn't work.

The purpose of the present invention is to use the cable from the other end.
When conducting a DC withstand voltage test on
DC test voltage is applied to the insulation such as the insulation operation rod at the disconnection part.
It is an object of the present invention to provide a gas-insulated switchgear which is prevented from being applied.

[0029]

According to the present invention, a cable head container accommodating a cable head is connected to another container accommodating other equipment via an insulating spacer, and a terminal of the cable head is provided on the insulating spacer . The present invention relates to a gas insulated switchgear electrically connected to a device in another container through the provided through conductor.

In the present invention, a disconnection portion operable from the outside is provided between the terminal of the cable head and the through conductor provided on the insulating spacer , and a conductor connection capable of connecting the DC test voltage applying means of the power cable. Cable
A conductor connecting portion and a cable head provided in a head container;
Between the two terminals via conductors directly connected to both terminals.
You.

Here, the test voltage applying means is a moving cable or a bushing for applying the test voltage.

[0032]

As described above, a disconnection portion operable from outside is provided between a terminal of a cable head and a through conductor provided on an insulating spacer , and a conductor connection portion for applying a test voltage is connected to a terminal of the cable head. When a DC withstanding voltage test is performed from the cable's own end side (the cable head side of the gas insulated switchgear) after connection, open the simple disconnection section, collect the gas in the cable head container, and Conduct a DC withstand voltage test of the cable without applying a DC voltage to the insulator of the gas insulated switchgear by connecting the bushing for applying the test voltage or the terminal of the transfer cable to the conductor connection part in the container. Can be.

When a DC withstanding voltage test is performed from the other end (the other end) of the cable, the test voltage is applied only by opening the simple disconnecting portion without performing gas treatment in the cable head container. In this case as well, no DC voltage is applied to the insulator of the gas insulated switchgear.

Further, a disconnecting portion is provided in the cable head container.
Since only one needs to be provided,
Simplify road configuration to reduce weight and cost
Can be planned.

[0035]

FIG. 1 shows an embodiment of the present invention, and a single-line diagram thereof is as shown in FIG. In this embodiment,
Similar to the gas insulated switchgear shown in FIG. 7, a simple disconnecting portion DSo is provided between the terminal of the cable head CHd and the connecting conductor 21 connected to the through conductor 3a of the insulating spacer 3. The simple disconnecting portion DSo includes a fixed electrode 35 attached to a terminal of the cable head CHd, and a linear displacement type movable electrode 36 attached to an end of the connection conductor 21 connected to the through conductor 3a of the insulating spacer 3. An operating rod 37 for operating the movable electrode 36 is connected to an operating shaft 39 via an operating mechanism 38. The operating shaft 39 is led out of the cable head container 1, and by manually operating the operating shaft 39, the movable electrode 36 is separated from the fixed electrode and the closed position where the movable electrode 36 contacts the fixed electrode 35 as shown in the figure. It can be linearly displaced from the open circuit position where the state is reached.

In this embodiment, the cable head CH of each phase
The conductor connection part 40 for applying a test voltage is connected to the terminal d. Each conductor connection part 40 is a known one in which a female contact such as a tulip contact capable of connecting and disconnecting a male contact freely is arranged in a shield. Each conductor connection part 40 is arranged so as to be directed to the branch pipe part 1b side of the cable head container 1, and with the lid plate 1c closing the opening of the branch pipe part 1b removed, the conductor connection part 40 is connected to the branch pipe part 1b. A terminal portion of a transfer cable for applying a test voltage or a center conductor of a bushing for applying a test voltage can be connected to each conductor connecting portion through the inside. Other configurations are the same as those of the conventional gas insulated switchgear shown in FIGS. 3, 5, and 7.

In the gas insulated switchgear of this embodiment, when a DC test voltage is applied from the end of the cable,
After the simple disconnecting part DSo is opened and the gas in the cable head container 1 is recovered, the cover plate 1c is removed, and the test voltage applying means is connected to the conductor connecting part 40 through the inside of the branch pipe part 1b. When the test voltage is applied via the moving cable, the contact provided at the terminal of the moving cable is connected to the conductor connecting portion 40. When a test voltage is applied through the test voltage application bushing, the nozzle supporting the bushing is connected to the flange at the end of the branch pipe portion 1b, and the center conductor of the bushing is connected to the conductor connection portion 40. .

When the test voltage is applied from the other end of the cable, it is only necessary to open the simple disconnecting portion DSo, and gas treatment in the cable head container 1 is not required.

The gas insulated switchgear to which the present invention is directed is:
Any structure may be used as long as it has a configuration in which the cable head is housed in a cable head container provided separately from the container in which the line-side disconnector DSL and the earthing switch ESL are housed. It is not limited to the embodiment. For example, in the above embodiment, the line-side disconnector DSL and the line-side grounding switch ESL are housed in a dedicated container 6, and the grounding switches ES1 and ES2 are housed in containers 12 and 16, respectively. These can be stored together with the circuit breaker in the circuit breaker container 14.

In the above embodiment, the conductor connection portion is used for applying a DC test voltage. However, when an accident occurs on the main body side of the gas insulated switchgear (left side of the insulating spacer 3 in FIG. 1). In addition, by opening the simple disconnecting portion DSo and connecting the moving cable for bypassing the gas insulated switchgear to the conductor connecting portion 40, it is possible to avoid a power failure until the accident is recovered.

[0041]

As described above, according to the present invention, a disconnection portion operable from the outside is provided between the terminal of the cable head and the through conductor of the insulating spacer, and the conductor connection portion for applying the test voltage is provided. Since it is connected to the cable head terminal, when conducting a DC withstanding voltage test from the end of the cable, the DC voltage is applied to the cable without applying DC voltage to the insulation of the switchgear.
A test voltage can be applied. Also the other end of the cable
When performing a DC withstanding voltage test from the
Do not apply a DC voltage to the
Cables without the need for gas treatment of containers other than
There is an advantage that a direct current test voltage can be applied to the power supply .

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of an embodiment of the present invention.

FIG. 2 is a single-line diagram of the gas-insulated switchgear of FIG. 1;

FIG. 3 is a cross-sectional view showing a configuration of a conventional gas insulated switchgear.

FIG. 4 is a single-line diagram of the gas-insulated switchgear of FIG. 3;

FIG. 5 is a cross-sectional view showing a configuration of a main part of another conventional gas insulated switchgear.

FIG. 6 is a single-line diagram of the gas insulated switchgear of FIG. 5;

FIG. 7 is a cross-sectional view showing a configuration of a main part of another conventional gas insulated switchgear.

8 is a single-line diagram of the gas-insulated switchgear of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cable head container 3 Insulation spacer 4 Connection conductor container 5 Insulation spacer 6 Disconnector container 7 Lightning arrester container 10 Insulation spacer 11 Insulation spacer 12 Connection conductor container 13 Insulation spacer 14 Breaker container 15 Insulation spacer 16 Disconnector container 17 Bus line container 18 Insulation Spacer CHd Cable head LA Lightning arrester DSL Line side disconnector ESL Line side grounding switch CB Circuit breaker ES1, ES2 Grounding switch for circuit breaker inspection BUS Busbar

Claims (1)

(57) [Scope of request for utility model registration] A cable head is housed in a cable head container filled with SF ₆ gas. The cable head container is connected to another container housing other equipment via an insulating spacer, and the cable head is connected to the cable head container. In a gas insulated switchgear in which a terminal is electrically connected to a device in the another container through a through conductor provided on the insulating spacer, a terminal provided on the cable head and the insulating spacer .
The disconnector can be operated from outside is provided between the through conductor, the conductor connection portion capable of connecting a DC test voltage applying means of the power cable to the cable head in the container is provided, wherein said conductor connecting portion The gap between the cable head terminals
A gas insulated switchgear characterized by being connected via a conductor directly connected to both .