JPH09252511A - Gas-insulated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cut down production cost and to provide a gas-insulated switchgear which makes it possible to require less time for conducting a breakdown voltage test. SOLUTION: To a conductor 5 inside a cable connecting part 1, a power cable 3 is connected via a slip-on female terminal 3A and a slip-on male terminal 3B. A slip-on female terminal 8A for testing is provided in a hole 6 for maintenance. A instrument transformer 2 for is provided on the top of the cable connecting part 1 and then connected to the conductor 5 via a slip-on female terminal 2A and a slip-on male terminal 2B. This slip-on male terminal 2B is provided in such a way as to be mountable and detachable with out exhausting the insulating gas from the slip-on female terminal 2A. A gas- insulated switchgear body 4 is connected to the cable connecting part 1 via a disconnector 9, while the conductor 5 is supported with a support insulation material.

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 used in a power transmission and transformation system, etc., and a gas-insulated switchgear with an improved connection to a transformer for instruments, a lightning arrester, a power cable, etc. Regarding

[0002]

2. Description of the Related Art A gas-insulated device is constructed by housing a conductive part in a grounded tank filled with an insulating gas such as SF6 gas which has an excellent arc extinguishing performance. Since the conductive parts of such gas-insulated equipment are not exposed,
The gas-insulated switchgear in which a plurality of gas-insulated devices are connected has the advantages that the grounding space can be reduced by arranging the devices in close proximity, and that they have little effect on the outside and are highly safe and reliable. In particular, with the recent increase in power demand and the difficulty of land acquisition in metropolitan areas, it has become necessary to increase the capacity and density of insulating devices installed in power transmission stations and substations. The gas-insulated switchgear having the above-mentioned advantages is rapidly spreading.

On the other hand, in order to efficiently supply electric power to the metropolitan area, there is a strong tendency to directly introduce a high-voltage system into an overcrowded urban area, and accordingly, the isolation distance for insulation is increased. The use of high-voltage power cables is increasing, in consideration of securing and harmony with the surrounding environment.

An example of the conventional arrangement of the cable connecting portion for connecting the gas insulated switchgear and the power cable will be described below with reference to FIGS. That is,
As shown in FIG. 13, a cable connecting portion 1 which is connected to the gas-insulated switchgear main body 4 and in which an insulating gas is sealed is provided with an instrument transformer 2 and a power cable 3 connected thereto. There is. Inside the cable connection part 1,
The conductor 5 is supported by the support insulator 10. The conductor 5 is connected to the gas-insulated switchgear main body 4 via a disconnector 9.

The power cable 3 is provided with a slip-on connection side terminal 3B at a detachable terminal end for cable connection called slip-on. A slip-on receiving side terminal 3A is attached to the cable connecting portion 1, and through the slip-on connecting side terminal 3B and the slip-on receiving side terminal 3A,
The power cable 3 is connected to the conductor 5 in the cable connection 1. The slip-on connection side terminal 3B is detachably attached to the slip-on receiving side terminal 3A without exhausting the insulating gas.

An instrument transformer 2 provided above the cable connecting portion 1 is provided with a conductor 5 via an instrument transformer disconnector 7.
It is connected to the. Further, the maintenance hole 6 provided on the side surface of the cable connecting portion 1 is provided with a test slip-on receiving side terminal 8A that does not require supply and discharge of insulating gas.

[0007] In the cable connecting portion as described above, the work for carrying out the AC withstanding voltage test of the gas insulated switchgear after the on-site installation of the gas insulated switchgear is completed will be described below. That is, as shown in FIG. 14, the test cable 8 connected to the AC high voltage generator 11 is provided with a test slip-on connection side terminal 8B. Then, the test slip-on connection side terminal 8B is connected to the test slip-on receiving side terminal 8A of the maintenance hole 6. Further, by extracting the slip-on connection side terminal 3B from the slip-on reception side terminal 3A, the power cable 3 which is not the target of the AC withstanding voltage test is disconnected from the conductor 5 without exhausting the insulating gas of the cable connection portion 1. With the above prepared condition, the test slip-on receiving side terminal 8
A test voltage is applied by the AC voltage generator 11 only to the gas-insulated switchgear main body 4 side through A and the test slip-on connection side terminal 8B and the test cable 8.

Further, the work for carrying out the DC withstanding voltage test of the power cable 3 after the on-site installation of the gas insulated switchgear described above is completed will be described below. That is, as shown in FIG. 15, the test cable 8 connected to the DC high voltage generator 11 is provided with a test slip-on connection side terminal 8B. Then, the test slip-on connection side terminal 8B is connected to the test slip-on receiving side terminal 8A of the maintenance hole 6. Further, the power cable 3 is opened in the disconnector 9 and the instrument transformer disconnector 7 while being connected to the conductor 5 through the slip-on connection side terminal 3B and the slip-on receiving side terminal 3A. In such a prepared state, the test voltage is applied only to the power cable 3 side by the DC high voltage generator 12 via the test slip-on receiving side terminal 8A, the test slip-on connecting side terminal 8B and the test cable 8. Is applied.

[0009]

By the way, the test voltage for carrying out the above AC withstanding voltage test is the voltage transformer 2
If the voltage is higher than the allowable voltage, it is necessary to open the instrument transformer disconnector 7 in advance and disconnect it from the conductor 5 before applying the test voltage. Further, as described above, it is also necessary to open the instrument transformer disconnector 7 when carrying out the DC withstanding voltage test. Therefore, it is necessary to provide a disconnector, which adds to the cost of the equipment and impairs economics.

In order to deal with this, a gas-insulated switchgear has been proposed in which the instrument transformer disconnector 7 is omitted and the instrument transformer 2 is directly connected to the conductor 5 to reduce the manufacturing cost. ing. However, in this case, in the field withstand voltage test of the gas-insulated switchgear main body 4 and the power cable 3, when disconnecting the instrument transformer 2 from the conductor 5, exhaust and re-insulation of the insulating gas in the cable connection part 1 are performed. Filling is required. However, when the insulating gas is exhausted or refilled in this manner, the working time becomes long, and foreign matter may enter the inside to deteriorate the insulating performance.

Although the supporting insulator 10 of the conductor 5 is designed to be used with a normal AC voltage, the DC high voltage generator has a smaller test device than the AC high voltage generator, and therefore has a long length. In the case of the on-site withstand voltage test of the power cable 3 of the distance, the direct current withstand voltage test using such a high-voltage DC generator is applied. However, in a gas-insulated switchgear that has been used for a long period of time, when performing a DC withstand voltage test for replacement of the power cable 3 or the like, the supporting insulator 10
There is a possibility that the dielectric strength may have deteriorated due to the contamination of. For this reason, the supporting insulator 10 must be cleaned before applying the DC test voltage, and at this time, the insulating gas in the cable connecting portion 1 must be exhausted and refilled.

The present invention has been proposed in order to solve the above problems of the prior art, and its purpose is to:
By simplifying the connection between the main unit and the device that needs to be disconnected from the main unit during the withstanding voltage test, the manufacturing cost is reduced and the insulating gas is exhausted when the device is disconnected. By eliminating the need for refilling
It is an object of the present invention to provide a gas-insulated switchgear capable of shortening the withstand voltage test execution time.

[0013]

In order to achieve the above object, the invention according to claim 1 is gas-insulated by a grounding tank filled with an insulating gas and a conductive portion housed in the grounding tank. A connecting part filled with an insulating gas is connected to a main body part of a device, to which a plurality of gas-insulated devices are connected, and a transformer for a meter and a lightning arrester via a conductor provided in the connecting part. In a gas-insulated switchgear in which at least one of the above is connected to the gas-insulated device, at least one of the instrument transformer and the lightning arrester and the conductor in the connection portion are connected by a connection terminal, the connection terminal, the While maintaining the sealing property of insulating gas,
It is characterized in that it is configured to be removable.

In the above-mentioned invention according to claim 1, the transformer for the instrument and the arrester are removed from the connection terminal and the voltage for the withstanding voltage test is applied without exhausting or refilling the insulating gas. Therefore, the disconnector and the like can be omitted.

According to a second aspect of the invention, in the gas-insulated switchgear according to the first aspect of the invention, a cable for a withstanding voltage test can be attached to and detached from the connection terminal.

In the invention according to claim 2 as described above, since the withstand voltage test cable can be connected by utilizing the connection terminals for the instrument transformer and the lightning arrester, the connection for the withstand voltage test is exclusively used. The terminal can be omitted.

According to a third aspect of the invention, in the gas-insulated switchgear according to the first or second aspect, the instrument transformer and the lightning arrester are housed in the same container, and the container and the connecting portion are connected to each other. It is characterized in that they are connected by one connection terminal.

According to the third aspect of the invention as described above, the number of connecting terminals can be reduced by sharing the connecting portions for the transformer for the instrument and the arrester.

According to a fourth aspect of the present invention, in the gas-insulated switchgear according to any one of the first to third aspects, the conductor in the connection portion is insulated and supported by an insulator that supports the connection terminal. It is characterized by being

According to the invention described in claim 4, the support insulator dedicated to the conductor in the connecting portion can be omitted.

According to a fifth aspect of the present invention, in the gas-insulated switchgear according to the first aspect, the connection terminal is provided in a line component equipment portion of the overhead wire drawing bushing connection portion or the transformer direct connection bushing connection portion. It is characterized by

In the invention according to claim 5 as described above, at the time of the withstand voltage test of the overhead line or the transformer, the transformer for the instrument is attached or detached without exhausting or refilling the insulating gas. Therefore, it is possible to shorten the on-site withstand voltage test work time,
It is possible to prevent the insulation performance from deteriorating due to the entry of foreign matter.

According to a sixth aspect of the present invention, in the gas-insulated switchgear according to the first aspect, the connection terminal is provided at a main bus bar portion.

According to the invention of claim 6 as described above, the voltage transformer can be attached and detached during the withstanding voltage test without exhausting or refilling the insulating gas. It is possible to shorten the time and prevent the insulation performance from deteriorating due to the entry of foreign matter.

According to a seventh aspect of the present invention, in the gas-insulated switchgear according to any one of the first to sixth aspects, the connection terminal is provided so that the insulating gas can be enclosed in the internal space of the connection terminal. The internal space of the connection terminal is connected to the main body via a stop valve.

According to the invention described in claim 7, it is possible to improve the insulation characteristics by injecting the insulating gas into the connection terminal.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a gas-insulated switchgear according to the present invention will be described below with reference to the drawings. The main body according to the claims is a gas-insulated switchgear main body, the connecting portion is a cable connecting portion, and the connecting terminals are a slip-on connecting side terminal and a slip-on receiving side terminal, which are the same as those of the prior art shown in FIGS. The same reference numerals are given to the members, and the description thereof will be omitted.

(1) First Embodiment One embodiment corresponding to the invention described in claims 1 and 2 will be described below as a first embodiment with reference to FIGS.

(Configuration) First, the configuration of the present embodiment will be described. That is, in the present embodiment, as shown in FIG. 1, the power cable 3 is connected to the conductor 5 in the cable connecting portion 1 via the slip-on receiving side terminal 3A and the slip-on connecting side terminal 3B. There is. The maintenance hole 6 is provided with a test slip-on receiving side terminal 8A. In addition, on the upper part of the cable connection part 1, a transformer 2 for meters
Is attached and connected to the conductor 5 via the slip-on receiving side terminal 2A and the slip-on connecting side terminal 2B. The slip-on connection side terminal 2B is detachably attached to the slip-on receiving side terminal 2A without exhausting the insulating gas. Gas insulated switchgear and cable connection 1
Is connected via a disconnector 9 and the conductor 5 is connected to the supporting insulator 1
Supported by 0.

(Operation) The operation of the present embodiment having the above configuration is as follows. That is, when the AC withstanding voltage test is performed after the on-site installation of the gas insulated switchgear is completed, the test cable 8 of the AC high voltage generator 11 is connected to the test slip of the maintenance hole 6 as shown in FIG. The conductor 5 in the cable connecting portion 1 via the ON receiving side terminal 8A and the test slip-on connecting side terminal 8B.
Connect to Further, by extracting the slip-on connection side terminal 3B from the slip-on reception side terminal 3A, the power cable 3 which is not the target of the AC withstanding voltage test is disconnected from the conductor 5 without exhausting the insulating gas of the cable connection portion 1.
When the test voltage is higher than the voltage allowed by the instrument transformer 2, the slip-on connection side terminal 2B is pulled out from the slip-on receiving side terminal 2A, so that the instrument transformer 2 is connected to the cable connecting portion 1. Disconnect without exhausting insulating gas.

In the thus prepared state, an AC voltage is generated only on the gas-insulated switchgear main body 4 side through the test slip-on receiving side terminal 8A, the test slip-on connecting side terminal 8B and the test cable 8. A test voltage is applied by the device 11.

On the other hand, when the DC withstand voltage test of the power cable 3 is performed after the on-site installation of the gas insulated switchgear is completed, the DC high voltage generator 12 is connected to the test cable 8 as shown in FIG. Test slip-on connection side terminal 8B
Is provided. The test slip-on connection side terminal 8B is connected to the test slip-on receiving side terminal 8A of the maintenance hole 6. Further, the power cable 3 is connected to the conductor 5 via the slip-on connection side terminal 3B and the reception side terminal 3A, and the slip-on connection side terminal 2B is extracted from the slip-on reception side terminal 2A.
The instrument transformer 2 is disconnected without exhausting the insulating gas from the cable connection 1. Further, after the disconnector 9 of the main circuit of the gas insulated switchgear is opened, only the power cable 3 side is passed through the test slip-on receiving side terminal 8A and the test slip-on connecting side terminal 8B and the test cable 8. A test voltage is applied by the DC high voltage generator 12.

(Effects) According to the present embodiment as described above, the configuration is such that the disconnector 7 for the transformer for the meter is omitted, so that the manufacturing cost can be reduced. Also,
During the on-site withstand voltage test of the gas insulated switchgear body 4 and the on-site withstand voltage test of the power cable 3, it is not necessary to exhaust and refill the insulating gas in the cable connection part 1, so the on-site withstand voltage test work time And it is possible to prevent deterioration of the insulation performance due to the entry of foreign matter.

(2) Second Embodiment Another embodiment corresponding to the invention described in claims 1 and 2 will be described below as a second embodiment with reference to FIG. Note that the description of the same components as those in the first embodiment will be omitted.

(Configuration) First, the configuration of the present embodiment will be described. That is, in the present embodiment, the maintenance hole 6 of the first embodiment shown in FIG.
A test slip-on receiving side terminal 8A and a slip-on receiving side terminal 13A having the same shape as the terminal are attached. The surge arrester 13 is connected to the slip-on receiving side terminal 13A via the slip-on connecting side terminal 13B.

(Operation) The operation of the present embodiment having the above-mentioned structure is as follows. That is, during the on-site AC withstand voltage test or the on-site DC withstand voltage test, the slip-on receiving side terminal 13A and the slip-on connecting side terminal 13B are discharged without exhausting the insulating gas in the cable connecting portion 1.
And the lightning arrester 13 is removed. Then, by connecting the AC high voltage generator 11 or the DC high voltage generator 12 via the test slip-on connection side terminal and the test cable 8, the on-site DC resistance of the first embodiment shown in FIGS. It is possible to configure the same state as during the voltage test.

(Effects) The effects of the present embodiment as described above are as follows. That is, even if the instrument transformer 2 is omitted, it is not necessary to exhaust and refill the gas in the cable connection portion 1 during the on-site AC withstand voltage test and the on-site DC withstand voltage test. The effect is obtained.

Further, since the test cable 8 can be directly connected by utilizing the attaching / detaching portion for the lightning arrester 13, the test slip-on receiving side terminal 8A dedicated to the on-site withstand voltage test can be omitted. . Therefore, the manufacturing cost can be further reduced, and the size and size can be reduced.

(3) Third Embodiment One embodiment corresponding to the invention described in claims 1 to 4 will be described below as a third embodiment with reference to FIG. The description of the same components as those in the above embodiment is omitted.

(Configuration) First, the configuration of the present embodiment will be described. That is, in the present embodiment, the instrument transformer 2 is provided in the tank 14 of the lightning arrester 13 including the test slip-on connection side terminal 13B. In the cable connection portion 1, the test slip-on connection side terminal 1
At the position corresponding to 3B, the slip-on connection side terminal 13
A is provided. The opening / closing mechanism portion of the disconnector 9 is arranged above the cable connection portion 1, and the conductor 5 is insulated and supported by the slip-on connection side terminal 13A.

(Operation / Effect) The operation / effect of the present embodiment having the above configuration is as follows. That is, like the first and second embodiments,
At the time of the local AC withstanding voltage test and the local DC withstanding voltage test, it becomes unnecessary to exhaust and refill the gas in the cable connection portion 1, and by sharing the slip-on connection portion for the lightning arrester and the instrument transformer, The number of slip-on connections used can be reduced. Further, since the slip-on connection portion is also used as an insulating support for the conductor 5, the supporting insulation dedicated to the conductor 5 can be omitted.
Therefore, the manufacturing cost can be further reduced, and the device can be downsized and downsized.

Further, as a result of reducing the number of slip-on connection portions used as described above, a single slip-on connection portion is provided with a sufficient margin so that the DC withstanding voltage test of the power cable 3 can be performed. It becomes possible. Therefore,
Even when performing a DC withstanding voltage test for replacement of the power cable with a gas-insulated switchgear that has been used for a long time
It is not necessary to exhaust or refill the insulating gas to clean the insulator before applying the DC test voltage. Therefore, in such a case, the working time of the on-site withstand voltage test can be shortened, and the deterioration of the insulation performance due to the intrusion of foreign matter can be prevented.

(4) Fourth Embodiment One embodiment corresponding to the invention described in claims 1 and 5 will be described below as a fourth embodiment with reference to FIG.

That is, the instrument transformer 2 in the present embodiment is not provided in the cable connecting portion 1 as in the first embodiment, but is provided with a bushing 15 for connecting to an overhead line. It is provided on the tank 16. The instrument transformer 2 is connected to the conductor 5 in the drawer tank 16 via the slip-on receiving side terminal 2A and the slip-on connecting side terminal 2B.

According to the present embodiment as described above, the voltage transformer can be attached and detached without exhausting or refilling the insulating gas during the withstand voltage test from the overhead line. It is possible to reduce the withstand voltage test work time and prevent the insulation performance from decreasing due to the entry of foreign matter.

(5) Fifth Embodiment Another embodiment corresponding to the invention described in claims 1 and 5 will be described below as a fifth embodiment with reference to FIG.

That is, in the instrument transformer 2 according to the present embodiment, the slip-on receiving side terminal 2A and the slip-on connecting side terminal 2B are connected to the direct connecting portion of the connecting conductor 19 connected to the bushing 15 of the transformer 17. Connected.

According to the present embodiment as described above, the instrument transformer 2 can be attached and detached without exhausting or refilling the insulating gas, which shortens the on-site withstand voltage test work time and prevents foreign matter. It is possible to prevent deterioration of insulation performance due to intrusion of

Further, by connecting the test cable 8 to the slip-on receiving side terminal 2A from which the slip-on connecting side terminal 2B is removed, it is possible to perform a local withstand voltage test of the gas insulated switchgear and the transformer.

(6) Sixth Embodiment One embodiment corresponding to the invention described in claims 1 and 6 will be described below as a sixth embodiment with reference to FIGS.

That is, in the present embodiment, as shown in FIGS. 8 to 11, the instrument transformers 2, 2a, 2b, 2c, 2d.
To the gas-insulated switchgear of single bus, double bus, 11/2 bus, and ring bus, respectively, and slip-on receiving side terminal 2
It is the connection applied through A and the slip-on connection side terminal 2B.

According to the present embodiment as described above, in the same manner as in the above-described first to fifth embodiments, when the on-site withstand voltage test of the gas insulated switchgear, the electric cable and the transformer is carried out, the insulating gas is used. Since the instrument transformers 2, 2a, 2b, 2c, 2d can be attached and detached without exhausting or recharging, the work time for on-site withstand voltage test is shortened, and the insulation performance is prevented from deteriorating due to the intrusion of foreign matter. Can be realized.

(7) Seventh Embodiment One embodiment corresponding to the invention described in claim 7 is the seventh embodiment.
An embodiment will be described below with reference to FIG.
The description of the same components as those in the first embodiment will be omitted.

That is, in the present embodiment, the first
In the embodiment, the slip-on receiving side terminal 2A and the slip-on connecting side terminal 2B that connect between the instrument transformer 2 and the cable connecting portion 2 cover the contact 20 inside the epoxy insulator tube 21. , 22 are provided. A space 26 between the epoxy insulator tube 21 and the epoxy insulator tube 22 is provided with a pipe 23 and a stop valve 25 so that an insulating gas can be filled therein. By connecting with, it is possible to monitor the common gas pressure.

According to the present embodiment as described above, the slip-on receiving side terminal 2A and the slip-on connecting side terminal 2B are provided.
By filling the inside of the container with an insulating gas, the contact 2
Since it is possible to easily realize insulation other than the electrical contact part of 0,
It is possible to downsize the slip-on connection part. Moreover, since the contact 20 can be prevented from deteriorating by being filled with an inert insulating gas, it is possible to provide a highly reliable gas insulated switchgear.

(8) Other Embodiments The present invention is not limited to the above embodiments, and the number, size, material, shape, arrangement, etc. of each member can be changed as appropriate. is there.

For example, the first embodiment shows a gas-isolated switchgear of a phase separation type in which a single-phase conductor is arranged inside, but a three-phase in which three-phase conductors are arranged inside at once. The same configuration can be applied to a collective type gas-insulated switchgear.

In the first embodiment, the instrument transformer 2 having the slip-on connection terminal is described. However, the lightning arrester 13 having the slip-on connection side terminal instead of the instrument transformer 2 has been described. The same configuration is possible even when the above is provided, and similar actions and effects are obtained.

Further, in the second embodiment, the lightning arrester 13 having the slip-on connecting portion terminal has been described, but in the case where the instrument transformer 2 having the slip-on connecting side terminal is provided instead of the lightning arrester 13. However, the same configuration is possible, and the same effect can be obtained.

[0060]

As described above, according to the present invention, the manufacturing cost is reduced by simplifying the connection between the main body and the device that needs to be disconnected from the main body during the withstand voltage test. At the same time, it is possible to provide a gas-insulated switchgear capable of shortening the time for carrying out the withstand voltage test by eliminating the need for exhausting or refilling the insulating gas when disconnecting the device.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of a gas insulated switchgear according to the present invention.

FIG. 2 is a cross-sectional view showing a state during an AC withstanding voltage test in the embodiment of FIG.

FIG. 3 is a cross-sectional view showing a state during a DC withstanding voltage test in the embodiment of FIG.

FIG. 4 is a sectional view showing a second embodiment of the gas insulated switchgear according to the present invention.

FIG. 5 is a sectional view showing a third embodiment of the gas insulated switchgear according to the present invention.

FIG. 6 is a sectional view showing a fourth embodiment of the gas insulated switchgear according to the present invention.

FIG. 7 is a sectional view showing a fifth embodiment of a gas insulated switchgear according to the present invention.

FIG. 8 is a sectional view showing a sixth embodiment of the gas insulated switchgear according to the present invention.

FIG. 9 is a sectional view showing a sixth embodiment of the gas insulated switchgear according to the present invention.

FIG. 10 is a sectional view showing a sixth embodiment of the gas insulated switchgear according to the present invention.

FIG. 11 is a sectional view showing a sixth embodiment of the gas insulated switchgear according to the present invention.

FIG. 12 is a sectional view showing a seventh embodiment of the gas insulated switchgear according to the present invention.

FIG. 13 is a sectional view showing an example of a conventional gas-insulated switchgear.

14 is a cross-sectional view showing a state during an AC withstand voltage test in the conventional example of FIG.

FIG. 15 is a cross-sectional view showing a state during a DC withstand voltage test in the conventional example of FIG.

[Explanation of symbols]

 1 ... Cable connection part 2, 2a, 2b, 2c ... Instrument transformer 2A, 3A, 13A ... Slip-on receiving side terminal 2B, 3B, 13B ... Slip-on connection side terminal 3 ... Power cable 4 ... Gas-insulated switchgear main body 5 ... Conductor 6 ... Maintenance hole 7 ...: Transformer for instrument disconnector 8 ... Test cable 8A ... Slip-on receiving side terminal for test 8B ... Slip-on connecting side terminal for test 9 ... Disconnector 10 ... Support insulator 11 ... AC high voltage generator 12 ... DC high voltage generator 13 ... Lightning arrester 14, 16 ... Tank 15, 18 ... Bushing 17 ... Transformer 19 ... Connecting conductor 20 ... Contact 21, 22 ... Epoxy insulator tube 24, 25 ... Stop valve 26 ... Space

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Nijikawa 66-2 Horikawa-cho, Sachi-ku, Kawasaki-shi, Kanagawa Toshiba Engineering Co., Ltd.

Claims (7)

[Claims] 1. A gas insulating device is constituted by a grounding tank filled with an insulating gas and a conductive portion housed in the grounding tank, and an insulating body is formed by connecting a plurality of the gas insulating devices. A gas-insulated switchgear in which a connection part filled with a reactive gas is connected, and at least one of a transformer for a meter and a lightning arrester is connected to the gas-insulated device via a conductor provided in the connection part. At least one of the transformer and the lightning arrester and the conductor in the connection portion are connected by a connection terminal, and the connection terminal is configured to be detachable while maintaining the hermeticity of the insulating gas. Characteristic gas-insulated switchgear. 2. The gas-insulated switchgear according to claim 1, wherein a cable for a withstand voltage test is attachable / detachable to / from the connection terminal. 3. The instrument transformer and the lightning arrester are housed in the same container, and the container and the connecting portion are connected by one connecting terminal. 2. Gas insulated switchgear according to 2. 4. The gas insulated switchgear according to claim 1, wherein the conductor in the connection portion is insulated and supported by an insulator that supports the connection terminal. 5. The gas-insulated switchgear according to claim 1, wherein the connection terminal is provided in a line component device portion of the overhead wire drawing bushing connection portion or the transformer direct connection bushing connection portion. 6. The gas insulated switchgear according to claim 1, wherein the connection terminal is provided in a main bus bar portion. 7. The connection terminal is provided so that the insulating gas can be enclosed in the internal space of the connection terminal, and the internal space of the connection terminal is connected to the main body via a stop valve. The gas insulated switchgear according to any one of claims 1 to 6.