JP4846514B2 - Gas insulated switchgear - Google Patents

Description

  The present invention relates to an improvement of a gas insulated switchgear.

  In general, gas-insulated switchgear widely used in the field of power transmission and distribution is roughly divided into a bus-side device, a circuit breaker, and a line-side device, and is housed in a container filled with insulating gas. The line side equipment, that is, the disconnector, the circuit breaker side grounding device (the grounding device is also referred to as “ground switch”, the same applies in this application), the line side grounding device, the instrument transformer, the power cable, etc. There are various structures.

Recently, the line-side equipment is housed in a minimum number of containers, so that the size can be further reduced and the gas insulated switchgear is often rationally arranged. As a line side device of such a gas-insulated switchgear, a single container for accommodating a disconnector or a breaker-side grounded switch is provided, and four openings are provided in the container, and a breaker and a meter are provided respectively. There are devices to which four devices are connected, such as a transformer for power, a line-side ground switch and a power cable (see, for example, Patent Document 1).
JP2000-245021

  In the configuration of the conventional gas-insulated switchgear as described above, it is necessary to confirm the insulation performance of the gas-insulated switchgear and the power cable before entering the actual system. For this reason, once the field installation has been completed, the movable part of the instrument transformer or the line side grounding device and the operation device are removed, and the withstand voltage test bushing is attached to the removed opening. Deterioration in quality and extension of the local installation period have become issues, and there is a need for a solution.

  The present invention solves the problems of the prior art as described above. The purpose of the present invention is to attach a withstand voltage test bushing without removing a transformer for measuring instrument or a grounding device on the line side, and maintaining quality and It is to provide a compact gas insulated switchgear that can shorten the installation period.

  In order to achieve the above object, in one aspect of the present invention, in a gas insulated switchgear, as a line-side device, a line-side disconnector, a breaker-side grounding device, a line-side grounding device, an instrument transformer, A power cable, and the line-side disconnector and the breaking-side grounding device are housed in a single container, the container is provided with four openings, and each opening has a line side. In a gas-insulated switchgear in which each of four devices of a disconnector, the instrument transformer, the line-side grounding device, and the power cable is disposed, the line-side disconnector, the line-side grounding device, The openings corresponding to each of the openings are arranged substantially opposite to each other, the openings corresponding to the instrument transformer and the power cable are arranged substantially opposite to each other, and the line-side disconnector is fixed. Side electrode conductor on the line side A first terminal for mounting the fixed electrode of the line-side grounding device on the fixed-side electrode conductor of the line-side disconnector, disposed substantially parallel to the flange surface provided in the opening corresponding to the ground device, and withstand voltage A second terminal for contacting the conductor of the test bushing is disposed on the flange surface side, and is connected to the movable portion of the line side grounding device facing the first terminal and to the second terminal. And a bushing conductor to be accommodated in the opening corresponding to the line side grounding device.

  According to the present invention, by arranging the movable part of the line side grounding device and the conductor of the withstand voltage test bushing in the opening of the container to which the line side grounding device is attached, the transformer for the instrument or the line side grounding device A withstand voltage test bushing can be attached without removing the movable part and the operation device, and a compact gas-insulated switchgear that can maintain quality and shorten the on-site installation period can be provided.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS The best mode for carrying out a gas insulated switchgear according to the present invention will be described below with reference to the drawings.

[1. First embodiment] ... corresponding to claims 1, 3 and 4 First, the first embodiment will be described with reference to FIGS. FIG. 1 is a typical single line connection diagram of a gas insulated switchgear, and FIG. 2 is a structural diagram of a first embodiment based on the single line connection diagram of FIG.

  In the first embodiment, the state shown in FIG. 2 is a state in which a withstand voltage test bushing is attached at the time of completion of field installation, and a meter is provided on both sides so as to sandwich the circuit breaker 1 in the container 2 of the circuit breaker 1. The current transformers 3a and 3b are accommodated, and the bus-side disconnectors 4a and 4b are vertically arranged on the left side of the instrument current transformer 3b. The bus bars 5a and 5b are arranged toward the front and back of the drawing, that is, with the front and back directions as the longitudinal direction.

  On the other hand, on the right side of FIG. 2, the line-side disconnector 6, the circuit breaker-side grounding device 7, the line-side grounding device 20, the instrument transformer 16, and the power cable 12 are arranged as the line-side devices. Has been. That is, the container 8 that accommodates the line-side disconnector 6 and the circuit breaker-side grounding device 7, the line-side grounding device 20, the instrument transformer 16, the power cable 12, and the like is configured as a single unit and includes four openings 9a, 9b, 9c, 9d.

  Here, in the container 8, the line side disconnector 6 is provided near the opening 9a, the line side grounding device 20 is provided in the opening 9b, and the power cable 12 is provided corresponding to the opening 9c. An instrument transformer 16 is provided corresponding to the opening 9d. Further, openings 9a and 9b corresponding to the line-side disconnector 6 and the line-side grounding device 20 are arranged so as to face each other, and the openings 9c corresponding to the power cable 12 and the instrument transformer 16 respectively. 9d is configured so as to be substantially opposed to each other. Moreover, each opening part 9a, 9b, 9c, 9d has the flange 10a, 10b, 10c, 10d, respectively.

  That is, if it follows the direction in FIG. 2, the circuit breaker 1 is connected to the flange 10a which faces to the left side via the insulating spacer 11, and the line side disconnector 6 and the circuit breaker side grounding device 7 are connected to the opposite direction. It is connected. A power cable 12 is vertically attached to the lower flange 10c, and the power cable 12 is accommodated in the opening 9c.

  Further, an instrument transformer 16 having a disconnecting device 15 is connected to the flange 10d located in the upper part of FIG. In many cases, the disconnecting device 15 is provided to disconnect the instrument transformer 16 that cannot withstand the local withstand voltage value from the main circuit at the time of local withstand voltage verification.

  Further, on the intermediate flange 13, the fixed-side electrode conductor 19 of the line-side disconnector 6 is supported by the insulating post 17 and is arranged substantially parallel to the flange surface of the flange 10 b. The fixed electrode 18 of the line side disconnector 6 is attached.

  Further, the power cable 12 is connected to the conductor 19, and a first electrode 21 for attaching a fixed electrode 21 of a line side grounding device (grounding switch) 20 provided in the flange 10b direction (right direction in FIG. 2) is attached. Terminal A (22) is provided, and a second terminal B (25) for contacting the conductor 24 of the withstand voltage test bushing 23 is provided. Here, the terminal B (25) is located above the terminal A (22). Of course, the terminal A (22) can be arranged above the terminal B (25).

  And the movable part 26 of the track | line side grounding apparatus 20 facing the 1st terminal A (22) and the bushing conductor 24 connected to the 2nd terminal B (25) are accommodated in the opening part 9b. . For this reason, a lid 28 is provided on the flange 10b of the opening 9b, and a part of the lid 28, for example, a substantially half surface on the lower side, penetrates a movable shaft 27 that drives the movable part 26 of the track side grounding device 20. In addition, a through hole 30 for the bushing conductor 24 is provided in a substantially half surface on the upper side of the lid 28.

  More specifically, first, the movable portion 26 of the line side grounding device 20 is normally grounded, and is disposed opposite to the fixed electrode 21, and the conductor 24 of the withstand voltage test bushing 23 is disposed above the movable portion 26. ing. In addition, the movable shaft 27 of the movable portion 26 penetrates the lid 28 attached to the flange 10 b while being airtight, and is connected to an external operating device 29.

  The lid 28 is provided with a hole 30 in the upper part of the movable shaft 27 and is connected to a withstand voltage test bushing 23. On the other hand, the operating device 29 is arranged in the downward direction in FIG. 2 in order to attach the withstand voltage test bushing 23. Note that a closing lid (not shown) is attached to the hole 30 during operation in the actual system.

  In general, the applied voltage value at the site is set lower than the rated voltage value of the device, and the movable part 26 of the line side grounding device 20 is grounded, so that the conductor 24 of the test bushing 23 is insulated. The distance can be set shorter than that of the equipment, and therefore the inner diameter of the opening 9b can be reduced, contributing to the compactness of the gas insulated switchgear.

  The example of FIG. 2 described above relates to a single-phase device, but the present invention can also be applied to a three-phase device, and by applying to such a three-phase device, the three-phase device in power transmission It is possible to enjoy the advantages of maintaining the quality and shortening the installation period, while taking advantage of the advantages of the equipment cost.

  As described above, according to the first embodiment, the movable portion 26 of the line side grounding device 20 and the conductor 24 of the withstand voltage test bushing 23 are disposed in the opening 9b of the container 8 to which the line side grounding device 20 is attached. By disposing, the withstand voltage test bushing 23 can be attached without removing the movable part 26 and the operating device 29 of the instrument transformer 16 or the track side grounding device 20, and the quality can be maintained and the field installation time can be shortened. A compact gas insulated switchgear can be provided.

  That is, according to the first embodiment, grounding by the grounding device 20 is maintained and the insulation distance in the bushing conductor 24 can be shortened, so that the size of the device is increased by increasing the diameter of the opening 9b, the lid 28, and the hole 30. The hole 30 provided in the lid 28 is provided exclusively for mounting the withstand voltage test bushing 23. For this reason, it is not necessary to attach or detach equipment such as the instrument transformer 16 or the movable part 26 of the track side grounding device 20 or the operation device 29 at the time of withstand voltage verification, and there is no deterioration in quality or extension of the installation work period due to the attaching / detaching work.

  In particular, in the first embodiment, the lid 28 of the opening 9b corresponding to the line side grounding device 20 is used by penetrating the grounding device movable shaft 27 and the withstand voltage test bushing 24 at the same time. The withstand voltage test can be quickly and easily performed without the necessity of attaching or detaching the equipment required for operation in Japan.

[2. Second Embodiment] ... corresponding to Claim 2 Next, in the second embodiment, an external device is connected between the fixed electrode of the line side grounding device and the second terminal in contact with the conductor of the withstand voltage test bushing. FIG. 3 shows an example of a gas insulated switchgear in which the third terminal to be connected is arranged in the same direction as the first terminal. In addition, the same code | symbol is attached | subjected to the structure same as 1st Embodiment, and the overlapping description is abbreviate | omitted.

  That is, in this FIG. 3, the conductor 32 is provided with a third terminal C (31) in the direction of the flange 10b between the first terminal A (22) and the second terminal B (25). It is supported by the same structure as the conductor 19 in the first embodiment.

  A connection conductor 33 is connected to the third terminal C (31), and the number of openings (9a, 9b, 9c, 9d) of the container 8 remains four, and other devices such as, for example, the insulating spacer 34 are used. A second power cable 35 is disposed in the container 82. The container 82 is the same as the container 8. The second power cable 35 is merely an example, and is connected to the conductor 32 in FIG. 3, but the same conductor 19 as shown in FIG. 2 can also be used.

  Thus, according to the second embodiment, by providing the terminal C (31) for another external device between the terminals A (22) and B (25) for the fixed electrode and the bushing, the container Other devices can be easily added without increasing the number of openings.

[3. Other embodiments]
In addition, this invention is not limited to the said embodiment, The thing illustrated below and other embodiment other than that are included. For example, the arrangement structure such as the top, bottom, left, and right shown in the above description and each figure, and the shapes and positional relationships of the conductors and other parts are merely examples, and can be appropriately changed. Within the scope of the invention.

Typical single wire connection diagram in the first embodiment of the gas insulated switchgear according to the present invention The block diagram showing the internal structure of 1st Embodiment of this invention The block diagram showing the internal structure of 2nd Embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Circuit breaker 3a, 3b ... Current transformer 4a, 4b ... Bus-side disconnector 5a, 5b ... Bus-line 6 ... Line-side disconnector 7 ... Circuit breaker-side grounding device 8, 82 ... Container 9a ... Container breaker Opening 9b on the line side grounding device side of the container 9c Opening 9d on the power cable side of the container Opening 10a, 10b, 10c, 10d on the instrument transformer side of the container Flange 12 ... Power cable 16 ... Instrument transformer 18 ... Fixed electrode 19 of the line side disconnector ... Conductor 20 to which the fixed side electrode of the line side disconnector is attached ... Line side grounding device 21 ... Fixed electrode of the line side grounding device 22 ... Terminal A
23 ... Bushing for withstand voltage test 24 ... Conductor 25 for the withstand voltage test bushing ... Terminal B
29 ... Operation device 30 of the line side grounding device ... A hole 31 for penetrating the conductor of the bushing for withstand voltage test ... Terminal C
35 ... Second power cable

Claims (4)

In the gas-insulated switchgear, the line side device includes a line side disconnector, a circuit breaker side grounding device, a line side grounding device, an instrument transformer, and a power cable.
The line-side disconnector and the breaker-side grounding device are housed in a single container, the container is provided with four openings, and each opening has the line-side disconnector, the instrument transformer, In the gas insulated switchgear in which each of the four devices of the line side grounding device and the power cable is disposed,
Each of the openings corresponding to the line-side disconnector and the line-side grounding device is disposed substantially opposite to each other,
Each of the openings corresponding to the instrument transformer and the power cable are arranged substantially opposite to each other,
The fixed-side electrode conductor of the line-side disconnector is disposed substantially parallel to the flange surface provided in the opening corresponding to the line-side grounding device,
A first terminal for attaching the fixed electrode of the line-side grounding device to the fixed-side electrode conductor of the line-side disconnector, and a second terminal for contacting the conductor of the withstand voltage test bushing, the flange surface side Arranged in
The movable part of the line side grounding device facing the first terminal and the bushing conductor connected to the second terminal are housed in the opening corresponding to the line side grounding device. Gas insulated switchgear. Provide a lid on the flange surface side of the opening corresponding to the track side grounding device,
In a part of the lid, a movable shaft that drives the movable part of the line side grounding device is penetrated,
The gas insulated switchgear according to claim 1, wherein a through hole for the bushing conductor is provided in the other part of the lid.   Between the first terminal to which the fixed electrode of the line side grounding device is attached and the second terminal in contact with the conductor of the withstand voltage test bushing, a third terminal connected to an external device is connected to the first terminal. The gas insulated switchgear according to claim 1 or 2, wherein the gas insulated switchgear is arranged in the same direction.   The gas insulated switchgear according to any one of claims 1 to 3, wherein the gas insulated switchgear is applied to a three-phase device.

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