JPH10243508A - Gas-insulated cubicle switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to reduce the switchgear by providing an almost cylindrical insulation cylinder with bottom penetrating through a partition in an airtight state as an insulation spacer and by combining this insulation spacer and a disconnector together in one united body. SOLUTION: In a power receiving unit 21, an insulation cylinder 33 having a bottomed cylindrical shape also functioning as an insulation spacer is provided in a state penetrating a partition 30 in an airtight state, and a fixed side conductor 34 penetrating in an airtight state through the bottom portion of this insulator cylinder 33 is provided. Then, the fixed side conductor 34 is connected to a cable head CHD and, on the other side, a movable rod 36 inserted in a freely slidable manner to a movable side terminal 36 of a vacuum circuit breaker VCB also functioning as a moving side conductor is provided to the fixed side conductor 34 in a freely contacting and separating manner. Also at the upper side of the vacuum circuit breaker VCB, in the same manner, an insulation cylinder 37, fixed side conductor 38, fixed side terminal 39, and a movable rod 40 are provided thereby constituting a disconnector DS. By doing this, the insulation spacer and the disconnector DS are combined in one united body and the switchgear can be made smaller.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cubicle-type gas insulated switchgear, which is miniaturized.

[0002]

2. Description of the Related Art A gas-insulated switchgear of 66/77 KV (hereinafter simply referred to as GIS) includes a pipe type GIS mainly used by electric power companies and a cubicle type GIS mainly used by private companies (hereinafter simply referred to as C-GIS). There are two types. The latter C-GIS includes a row type and a unit (box) type depending on the form of the product.

[0003] As the types of GIS, there are those shown in Conventional Examples 1-4.

A new package type GI according to Conventional Example 1
S is shown in FIG. 12A and 12B are power receiving units, FIGS. 12C and 12D are primary transformer units, and FIGS.
(F) shows the PCT section. In FIG. 12, reference numeral 1 denotes a pipe section formed of a pipe, 2 denotes an operation section for operating a GCB or the like, 3
Is a front panel. In the figure, BUS is a bus, ES is a ground switch, LA is a lightning arrestor, GCB is a gas circuit breaker, EDS is a disconnector with a ground switch, PCT is a transformer for a transaction instrument,
TR is a transformer.

Next, FIGS. 13 (a), 13 (b) and 13 (c) show a row-type GIS according to Conventional Example 2. FIG. As shown in FIG. 13A, power receiving units 4 and 5 and a PCT unit 6 are arranged. The power receiving units 4 and 5 shown in FIG. 13B and the PCT unit 6 shown in FIG. Devices are accommodated in 7, 8 and filled with insulating gas, and partition plates 9, 10 and the like are provided. Each unit is connected via a power cable. In the figure, DS is a disconnector,
VCB is a vacuum circuit breaker, BCT is a through current transformer, VD is a voltage detector, CHD is a cable head, and CT is a current transformer.

Next, FIGS. 14 (a) and 14 (b) show a row-type GIS according to Conventional Example 3. FIG. FIG. 14A shows a power receiving board, and FIG. 14B shows a transformer primary board. The devices are housed in arc-shaped rectangular containers 11 to 14 which are pressure containers as shown in the figure,
These are covered by the decorative outer walls 15 and 16 to form a double structure.

Finally, a phase-separated GIS according to Conventional Example 4
Is shown in FIG. In this case, the operation box 17 of the circuit breaker is used as a surface plate, and an insulating bus bar for each phase is used.

[0008]

However, in the GIS according to the conventional example 2, since each unit is connected by a power cable, terminal processing of the power cable is required, which increases the cost. Also, it has poor long-term reliability. G according to Conventional Example 3
The IS has a double structure in which the outside of the pressure vessel is covered with a decorative outer wall, so that the cost increases. In addition, as a matter common to the GISs according to Conventional Examples 2 and 3, in both cases, since both surfaces of the insulating spacer are set in parallel with the horizontal plane, foreign matter easily adheres to the outer surface of the insulating spacer and dielectric breakdown easily occurs. In Conventional Example 3, since the insulating spacer is disposed at a position affected by the metal fine powder accompanying opening / closing of the disconnector, the countermeasures for improving the reliability are reversed. Further, with respect to the GISs according to the conventional examples 2 and 3, the technology of accommodating the disconnecting switch, the circuit breaker and the like in a lump in the pressure vessel is excellent. Will be affected and it will take a long time to recover.

Accordingly, an object of the present invention is to provide a cubicle-type gas insulated switchgear which solves the above problem.

[0010]

According to a first aspect of the present invention, there is provided a main circuit conductor which penetrates a partition wall through an insulating spacer inside a housing, the main circuit conductor comprising: In a cubicle-type gas insulated switchgear provided with a disconnector, a substantially bottomed cylindrical insulating cylinder is hermetically penetrated through the partition wall as the insulating spacer, and a fixed-side conductor is hermetically penetrated through the bottom of the insulating cylinder. On the other hand, a movable-side conductor is provided on the opening side of the insulating cylinder, and a movable rod slidable with respect to the movable-side conductor is provided so as to be able to contact and separate from the fixed-side conductor. The disconnector is configured, and the configuration of the invention according to claim 2 is:
In addition, a terminal of the circuit breaker connected to the disconnector is used as the movable-side conductor.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

(A) Embodiment 1 Embodiment 1 of a cubicle type gas insulated switchgear according to the present invention is shown in FIGS. FIG. 1 is a single-line diagram of a cubicle-type gas-insulated switchgear. FIG. 5A is a front view of the cubicle-type gas-insulated switchgear, and FIG.
Is a right side view. As shown in FIG. 5, a power receiving unit 21 and a transformer primary unit 22 are arranged on the left and right of the PCT unit 20 as a center, and a bus connecting unit 23 is further provided on the right side.

First, the structure of the power receiving unit 21 is shown in FIG. The inside of the housing 19 is partitioned by partitions 27, 28, 29, and 30, and the bus room 24, the drop-in room 25, and the circuit breaker room 26
Are formed, and these three spaces are filled with an insulating gas. A cable head CHD for receiving power as a cubicle-type gas insulated switchgear is provided on the left side of the drop-in chamber 25, while a bus BUS is provided in the bus bar chamber 24, and a gap between the two via a vacuum circuit breaker VCB or the like. It is connected.

Here, the disconnecting switch DS provided below the vacuum circuit breaker VCB is configured as follows. A bottomed cylindrical insulating tube 33 also serving as an insulating spacer is provided in a state where the insulating tube 33 airtightly penetrates through the partition wall 30, and a fixed-side conductor 34 that penetrates the bottom of the insulating tube 33 airtightly is provided. Fixed side conductor 3
4 is connected to the cable head CHD, the movable bar 36 is slidably inserted into the movable terminal 35 of the vacuum circuit breaker VCB also serving as the movable conductor, and the left end of the movable bar 36 is connected to the fixed conductor 34. It is provided detachably. Vacuum breaker V
Similarly, on the upper side of the CB, the insulating cylinder 37 and the fixed-side conductor 3
8, a fixed terminal 39 and a movable rod 40 are provided.
S.

In addition, the grounding rod 4 is moved to the left in FIG.
The fixed terminal 39 and the movable terminal 35
Grounding switch E for grounding by contacting
S is provided above and below the right side of the vacuum circuit breaker VCB.

An operation unit 43 is provided on the right side of the vacuum circuit breaker VCB. The operation unit 43 includes driving means for driving the vacuum circuit breaker VCB, and movable bars 40 and 3 in the upper and lower disconnectors DS.
6 and driving means for driving the grounding rods 41 and 42 of the upper and lower grounding switches ES.

A front panel 32 is provided on the front surface of the housing, while a rear panel 31 is provided on the rear surface.
Between the back panel 31 and the transformer current transformer PC
A load bus BUS forming a flow path of a current flowing toward the transformer TR after flowing through T is accommodated therein.

Next, the structure of the transformer primary unit 22 will be described with reference to FIG. As in the case of the power receiving unit 21, the inside of the housing 19 is vertically divided by a partition wall 27 which is long in the horizontal direction, and the grounding switch ES and the lightning arrester LA in the drop-in chamber 25 are provided.
Except for the above, the structure below the partition 27 is the same as that of the power receiving unit 21. On the other hand, above the partition wall 27, the partition wall 28 is disposed on the front side, and the busbar chamber 2 on the rear side is provided.
4, a bus BUS is arranged. Above the bus chamber 24, a ground voltage transformer GPT filled with insulating gas is provided, and is connected to the fixed-side conductor 38 in the bus chamber 24. When using a plastic film insulated grounding voltage transformer GPT, it can be arranged above the partition wall 27 in the housing 19 because of its small size. When the present invention is applied to a circuit in which the ground voltage transformer GPT is unnecessary, the ground current transformer GPT is removed so that nothing is placed on the housing 19. The connection with the transformer TR is performed via a cable connected to the cable head CHD. However, when directly connected via an insulated bus, the partition wall 29 and the cable head CHD are removed, and a conduit for the insulated bus is provided on the back panel 31. Attach.

Next, the structure of the PCT unit 20 is shown in FIG.
It will be described based on. As shown in the figure, the bus bars 46 are formed on the left and right of the upper part of the housing 19 by the partition walls 44 and 45, and the bus BUS is accommodated therein. On the other hand, a transformer current transformer PCT for transaction instruments is accommodated below the partition wall 44. The transformer current transformer PCT for transaction instruments is individually connected to the left and right buses BUS via the disconnecting switch DS and the earthing switch ES. Have been. As the disconnector DS, one using an insulating cylinder which also serves as an insulating spacer as described above is used. As the grounding switch ES, one having a grounding rod 47 that comes into contact with the movable-side conductor 18 from above is used. And the housing 1
The movable rod 40 of the disconnector DS is mounted on the
An operation unit 49 is provided for moving the ground rod 47 in the horizontal direction and moving the grounding rod 47 up and down. The disconnector D
When the S, ground switch ES is not required, the insulating cylinder may be changed to a conventional insulating spacer.

Next, the bus connecting unit 23 will be described with reference to FIG. As shown in FIG. 11A, the casing 19 is vertically partitioned by a partition wall 51, and the upper space is partitioned left and right by a partition wall 50. 11A, main circuit conductors 52 and 53 for three phases are provided in the upper right and left spaces in a direction perpendicular to the paper surface, respectively, and a pair of disconnectors are provided between the main circuit conductors 52 and 53. A switch DS and a single ground switch ES are provided. As shown in FIG. 11A, a pair of disconnectors DS each having an insulating cylinder also serving as an insulating spacer are mounted on the mounting wall 54 in the same manner as described above, and the fixed-side conductors 38 are individually connected to the main circuit conductors 53 and 52. Have been. On the other hand, the movable-side conductors 18 are connected via the connection conductor 55. An operation unit 56 for operating the upper and lower DSs,
The operation units 56 and 57 are provided with levers 58 and 59, respectively.
Are connected to the movable rods 40 via the. Operation unit 56
The grounding rod 60 which comes into contact with and separates from the movable-side conductor 18 is interlockingly connected to the movable side conductor 18 to form a grounding switch ES.

In the bus connecting unit 23 shown in FIG.
FIG. 1 shows a grounding current transformer GPT mounted inside the transformer primary unit 22 shown in FIG. 1 and a grounding voltage current transformer GPT connected to the position Q shown in FIG. 11 can be accommodated in the lower part of the housing 19 as indicated by a virtual line. The bus connection unit 23 is not used in the cubicle type gas insulated switchgear having a configuration in which the disconnector and the earthing switch are not provided at the position indicated by 23 in FIG.

Finally, the PCT bypass circuit 61 shown in FIG. 1 will be described. This PCT bypass circuit 61 has the configuration shown in FIG.
1A, a disconnector DS and a grounding switch ES similar to those attached to the mounting wall 54 are attached to the partition wall 28 in FIG. 8, and the buses BUS arranged at positions sandwiching the partition wall 28 in FIG. It is connected via a switch DS and a grounding switch ES, but is not shown.

Next, the operation of the cubicle type gas insulated switchgear will be described. Power receiving unit 2 in FIGS. 8 and 9
1, in the transformer primary unit 22, the circuit breaker room 26
The vacuum circuit breaker VCB, disconnecting switch DS, grounding switch ES, and operation unit 43 in the inside are integrally configured to form a circuit breaker with DS / ES. Therefore, the insulating gas can be filled in the circuit breaker chamber 26 in advance, and the gas division required for the cubicle-type gas insulated switchgear is easy.
Compatible with EMA standard C type (cubicle type) and M type (metal clad type) gas insulated switchgear. Also, M
In the conventional cubicle-type gas insulated switchgear of the type, the insulating spacer is attached to the partition and the disconnector and the circuit breaker separately mounted are connected. In the present invention, the insulating spacer and the disconnector are integrated. It has been downsized. Furthermore, since the movable rod for connecting and disconnecting between the fixed side conductor penetrating the insulating cylinder also serving as the insulating spacer and the terminal of the vacuum circuit breaker is provided to constitute the disconnector, the components constituting the disconnector are separately provided. There is no need to provide them, which leads to a reduction in the number of parts, cost reduction and space saving.

In addition, as shown in FIGS.
US arranged the power bus on the front panel 32 side and the load bus on the back panel 31 side in the vertical direction.
The space between the power supply side and the load side can be used effectively. That is,
At the same time, the connection work of the main circuit conductor is facilitated, and at the same time, it is possible to attach the grounding current transformer GPT and the like.

In the transformer primary unit 22, FIG.
As shown in (1), since the grounding current transformer GPT is provided on the housing 19, there is no need to provide a separate GPT unit. Furthermore, when checking the vacuum circuit breaker VCB, the disconnector DS at the lower left can be opened to separate the vacuum circuit breaker VCB from the transformer TR.

(B) Embodiments 2, 3, and 4 FIG. 2 shows a single-line connection diagram of the cubicle-type gas insulated switchgear of Embodiment 2, and FIG. 6 shows an external view thereof. FIG. 3 shows a single-line diagram of the cubicle-type gas-insulated switchgear of Example 3, and FIG. 7 shows an external view thereof. FIG. 4 shows a single-line diagram of the cubicle-type gas-insulated switchgear of the fourth embodiment. Here, the positions of the power receiving unit 21 and the transformer primary unit 22 may be switched.

The second to fourth embodiments can be configured by arranging and connecting the devices in each unit in the first embodiment.

[0028]

As can be seen from the above description, claim 1
According to the cubicle type gas insulated switchgear according to the above, since the insulating spacer and the disconnector are integrated, the number of parts is reduced, the cost is reduced, and the cubicle type gas insulated switchgear can be downsized.

According to the cubicle type gas insulated switchgear of the second aspect, the terminal of the circuit breaker is used as a movable side conductor in the first aspect, so that the circuit breaker and the disconnector are integrated and incorporated into the circuit breaker room. Filling with an insulating gas facilitates gas division that was not possible with a small cubicle-type gas-insulated switchgear, and makes it possible to change from a C-type cubicle to an M-type cubicle with added partitions.

[Brief description of the drawings]

FIG. 1 is a single-line diagram showing Embodiment 1 of a cubicle-type gas-insulated switchgear according to the present invention.

FIG. 2 is a single-line diagram showing Embodiment 2 of a cubicle-type gas-insulated switchgear according to the present invention.

FIG. 3 is a single-line diagram showing a third embodiment of the cubicle-type gas-insulated switchgear according to the present invention.

FIG. 4 is a single-line diagram showing a cubicle-type gas insulated switchgear according to a fourth embodiment of the present invention.

5 (a) is a front view and FIG. 5 (b) is a right side view of the cubicle type gas insulated switchgear according to the first embodiment of the present invention.

6 (a) is a front view and FIG. 6 (b) is a right side view of a cubicle type gas insulated switchgear according to a second embodiment of the present invention.

7 (a) is a front view and FIG. 7 (b) is a right side view of a cubicle type gas insulated switchgear according to a third embodiment of the present invention.

FIG. 8 is a configuration diagram of a power receiving unit according to the first embodiment of the cubicle type gas insulated switchgear according to the present invention.

FIG. 9 is a configuration diagram of a transformer primary unit according to the first embodiment of the cubicle type gas insulated switchgear according to the present invention.

FIG. 10 is a configuration diagram of a PCT unit according to the first embodiment of the cubicle-type gas insulated switchgear according to the present invention.

11A and 11B relate to a bus connecting unit in Embodiment 1 of the cubicle type gas insulated switchgear according to the present invention, and FIG.
2 is a front view showing a left half, and FIG. 2B is a left side view of FIG.

12A is a side view of the power receiving unit, FIG. 12B is a front view of the power receiving unit, FIG. 12C is a side view of the primary part of the transformer, and FIG. 12D is a transformer. Front view of the primary part,
(E) is a side view of a PCT part, (f) is a front view of a PCT part.

13A is a perspective view of an external appearance, FIG. 13B is a configuration diagram of a power receiving unit, and FIG.
The block diagram of a T unit.

14A is a configuration diagram of a power receiving panel, and FIG. 14B is a configuration diagram of a transformer primary panel, according to GIS according to Conventional Example 3. FIG.

FIG. 15 is a perspective view of a GIS according to Conventional Example 4.

[Explanation of symbols]

 18 movable conductor 19 housing 27, 30, 45 partition wall 33, 37 insulating cylinder 34, 38 fixed conductor 35 movable terminal 36, 40 movable rod 39 fixed terminal 43, 49, 56, 57: operation unit 54: mounting wall DS: disconnector VCB: vacuum circuit breaker

Claims (2)

[Claims] 1. A cubicle-type gas insulated switchgear having a main circuit conductor penetrating a partition via an insulating spacer inside a housing, and a disconnector provided in the main circuit conductor, wherein the partition is hermetically sealed as the insulating spacer. An insulating cylinder having a substantially bottomed cylindrical shape penetrating therethrough is provided, and a fixed-side conductor is provided to hermetically penetrate the bottom of the insulating cylinder, while a movable-side conductor is provided on the opening side of the insulating cylinder, and the movable-side conductor is provided. A cubicle-type gas insulated switchgear, characterized in that a movable rod slidably provided on the fixed-side conductor is provided so as to be able to contact and separate therefrom, and the movable rod is interlocked with driving means to constitute the disconnector. 2. The cubicle type gas insulated switchgear according to claim 1, wherein a terminal of a circuit breaker connected to the disconnector is the movable side conductor.