JPH1056709A - Cubicle gas insulation switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lessen the depth of a cubile gas insulation switchgear by storing, in a bus bar connecting unit, breakers with ground switches formed on the bus-bar side and the load side of a PCT and a GPT. SOLUTION: In a PCT unit 21, a PCT 43 is connected between a power supply bus bar 32 and a load bus bar 40 and breakers 44a, 44b with ground switches are installed on both sides of the PCT 43 and a breaker 44c with a ground switch for bypassing is so installed as to bypass the PCT 43. In a transformer circuit unit 22, a breaker 50 with a ground switch and a ground switch 51 are installed on both sides of a breaker 49 installed between a cable 48 connected to a transformer and a load bus bar 40. A bus bar connecting unit 24 has bus bar connecting circuits with breakers on the power supply side and the load side of a PCT stored as a unit in a case 24a and houses a transformer 55 for grounding in it. Owing to this structure, the depth of the cubicle gas insulation switchgear can be shortened.

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 has a reduced installation area.

[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.

The types of GIS are shown in Conventional Examples 1 to 4.

A new package type GI according to Conventional Example 1
S is shown in FIG. FIGS. 16 (a) and 16 (b) are power receiving units, FIGS. 16 (c) and 16 (d) are transformer primary units, and FIGS.
(F) shows the PCT section. In FIG. 16, reference numeral 1 denotes a pipe section including 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. 17 (a), 17 (b) and 17 (c) show a row type GIS according to Conventional Example 2. FIG. As shown in FIG. 17A, power receiving units 4, 5 and a PCT unit 6 are arranged, and the power receiving units 4, 5 shown in FIG. 17B and the PCT unit 6 shown in FIG. In this apparatus, devices are housed in bodies 7 and 8 and filled with insulating gas, and partition plates 9 and 10 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. 18 (a) and 18 (b) show a row type GIS according to Conventional Example 3. FIG. FIG. 18A shows a power receiving board, and FIG. 18B 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 prior art 1, since the number of pressure vessels is large because of the combination of the channel type units, the cost is high, the size is reduced, and the outer surface is limited. It is not aesthetically pleasing because it is not covered by the housing. In the GIS according to the second conventional example, since each unit is connected by a power cable, terminal processing of the power cable is required, which increases costs. Also, it has poor long-term reliability. The GIS according to the conventional example 3 has a double structure in which the outside of the pressure vessel is covered with a decorative outer wall, so that the cost is high, and the disconnector and the circuit breaker are collectively housed in the pressure vessel, so that a ground fault or the like occurs. When an accident occurs, all of the stored electrical equipment is affected, and it takes a long time to recover. In the GIS according to Conventional Example 4, a large installation space is required because the distance between the circuit breaker and the bus bar is long. In addition, because of the phase-separated type, it is difficult to reduce the size by compounding and the cost increases.

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 power receiving unit, a PCT unit, and a transformer, wherein an electric device is accommodated in a housing. A circuit unit, a bus connection unit,
And a GPT unit, wherein the power receiving unit comprises:
The poles of the circuit breaker are placed horizontally and a pair of disconnectors with grounding switch are disposed vertically above the circuit breaker, and the PCT unit is provided with a disconnector with grounding switch for disconnecting PCT. , A disconnector with a grounding switch for a PCT bypass, the transformer circuit unit houses a disconnector with a grounding switch for a PCT bypass, and the bus connecting unit includes a bus side and a load side of the PCT. And a GPT (grounding transformer).

[0011]

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

The cubicle type gas insulated switchgear according to the present invention uses a power receiving unit 20 shown in FIG. 1 and a PCT shown in FIG. 2 in order to standardize the units constituting the GIS.
Unit 21 and the transformer circuit unit 2 shown in FIGS.
2 and 23, a bus connecting unit 24 shown in FIG. 5, and a GPT unit 25 shown in FIG.

First, the power receiving unit 20 shown in FIG. 1 will be described. As shown in the figure, a circuit breaker 26 is provided horizontally in the housing 20a, and a disconnector (DS, ES) 2 with a ground switch is provided so as not to protrude from the length of the pole portion in the left-right direction.
7 and 28 are provided vertically above the circuit breaker 26 to reduce the installation area of the power receiving unit 20. The type of the circuit breaker 26 may be either VCB or GCB, but the pole portion is housed in an insulating protection tube. GC
In the case of B, the insulation protection cylinder is housed in an iron tank. A cable 29 buried in the ground for drawing in from the ground is drawn into the housing 20a via the cable head 30, and is connected to the power supply bus 32. In the figure, 33 is a through current transformer (BCT), 34 is a lightning arrester (LA), 35 is a voltage detector (VD), 36 is a partition plate, and 37 is an insulating spacer.

The lightning arrester 34 is moved up and down by an operating mechanism (not shown) so as to connect to and disconnect from the main circuit. Reference numeral 38 denotes operating means for operating the disconnecting switches 27 and 28 with grounding switches, and 39 denotes operating means for operating the circuit breaker 26.

A load bus 40 is provided beside the power supply bus 32, so that a necessary device can be arbitrarily connected or a loop can be formed by the device or the bus so that the units can be freely arranged. In the case where the cable 29 is drawn in aerial instead of the cable 29, the conduit integrated container 41 with a bushing is attached as shown by a virtual line in the upper left of FIG. 1, and the lightning arrester 34 is attached to the cable head 30. When a gas section is provided between the disconnecting switch 28 with a grounding switch and the cable head 30 as in the case where the cable 29 is OF, a partition plate 42 and an insulating spacer (not shown) are provided as shown by phantom lines.

Next, the PCT unit 21 shown in FIG. 2 will be described. As shown in FIG. 7, a PCT unit 21 is connected between a power supply bus 32 and a load bus 40 by a single wire connection diagram.
3 are connected, and disconnectors 44a and 44b with grounding switches are provided on both sides of the PCT 43. Further, a disconnector 4 with a grounding switch for bypass is provided at a position where the PCT 43 is bypassed.
4c, which contributes to a reduction in the installation area. In the figure, 21a is a housing, 45 is a PCT connection part, 46 is a through-type current transformer (BCT) provided when connected in series with the PCT 43, and 47 is operating means. When the disconnecting switch 44c with the earthing switch is not provided,
c, 44a is not provided, or the disconnector 44
a, 44b, and 44c may not be provided.

Next, the transformer circuit unit 2 shown in FIGS.
2 and 23 will be described. The transformer circuit unit 22 shown in FIG. 3 is a unit having a standard equipment configuration, and is a single-line connection diagram shown in FIG. The transformer circuit unit 23 in FIG. 4 is a unit having a device configuration with a PCT bypass disconnector, and is a single-line connection diagram in FIG.

In the transformer circuit unit 22 shown in FIG. 3, a breaker 49 is provided between a cable 48 connected to a transformer (not shown) and the load bus 40, and a disconnector 50 with a ground switch is provided on both sides of the breaker 49. , A grounding switch 51 is provided.
22a is a housing, 52 is a cable head.

In connection with the transformer, if an overhead wire connection (bushing out) is used instead of the cable 48, a conduit integrated vessel 53 with a bushing shown in FIG. You may make it connect a transformer directly via a pipe line. In any case, the busbar support insulator is attached to the position shown in FIG.

As can be seen by comparing FIGS. 8 and 9, the transformer circuit unit 23 shown in FIG. 4 has a power supply bus 32 and a load bus 40 in addition to the transformer circuit unit 22 shown in FIG. Disconnector 44 with ground switch that bypasses PCT 43
c. This can save space. 23a is a housing, and 54 is a PC if necessary.
It is a through-type current transformer (BCT) attached to a T bypass circuit.

Next, the bus connecting unit 24 shown in FIG. 5 will be described. This is a circuit in which a bus connection circuit with a disconnector on the power supply side and the load side of the PCT is housed in a housing 24a and formed as a single unit. Transformer (GPT) 5
5 is built in. When the GPT 55 is connected to a position on the generator circuit side indicated by A in FIG. 10, a connection bus 56a is provided, and when the GPT 55 is connected to a position between disconnectors indicated by B, a connection bus 56b is provided. And (b),
If necessary, a disconnector for GPT55 is installed at the position (c). 57 and 58 are disconnectors, 59 is disconnectors 57 and 58
Is an operation means for operating.

Finally, the GPT unit 25 shown in FIG. 6 will be described. One GPT 55 is housed in the housing 25a, and is connected to the load bus 40 via the connection bus 60. A disconnector for GPT can be attached in the middle of the connection bus 60. GPT55 is inside the GPT unit 25.
Can accommodate up to two. GPs are placed at positions A and B in FIG.
When installing T55, install 2 in GPT unit 25.
One of the two methods is used, or one is accommodated in the GPT unit 25 and the other is accommodated in the bus connecting unit 24.

Next, a method of using these five units in combination will be described.

First, in the case of a cubicle-type gas insulated switchgear of the ordinary / spare two-line one-meter type shown in FIG. 11, two power receiving units 20, a single PCT unit 21, and two transformer circuit units What is necessary is just to combine with 22 or 23, and arrangement | positioning of a unit can be performed freely. Then, in the case of having a GPT, a single GPT unit 25 may be added.

Next, in the case of a cubicle-type gas insulated switchgear of the ordinary / spare two-line one-meter bypass system shown in FIG. 12, the same unit combination as in FIG. 11 may be used. The PCT unit 21 is a disconnector 44c with a grounding switch.
Therefore, any of the cubicle-type gas insulated switchgears shown in FIG. 11 or FIG. 12 is possible by attaching or detaching the same. The configuration shown in FIG.
The feature is that it can be performed by the CT unit.

Next, in the case of a cubicle-type gas-insulated switchgear of the ordinary / spare two-line two-meter type shown in FIG.
In addition to the unit used in FIG. 11, another PCT unit 21 and a busbar communication unit 24 may be added.
The GPT can be attached to any of (C), (D), and (E) in the figure, but if it is to be attached to two places (D) and (E), another GPT unit 21 is added. There must be. As for the arrangement of the units, the bus connecting unit 24 is arranged in the center, and the power receiving unit 20 and the P
One CT unit 21 and one transformer circuit unit 22 are arranged on the left and right. The GPT unit 21 is arranged on the required single wire side. The position may be free. It is characterized in that the GPT is accommodated in the bus connecting unit 24.

Finally, in the case of a cubicle type gas insulated switchgear of the loop power receiving 1 metering bypass type shown in FIG. 14, two power receiving units 20, a single PCT unit 21, and a single transformer circuit unit 22 and a transformer circuit unit 23 with a disconnector for PCT bypass, and a bus connecting unit 24. The GPT can be attached to any of (F), (G), and (H) in the figure. However, if the GPT is attached to two places (G) and (H), another bus connecting unit 24 is added. There must be. As for the arrangement of each unit, the bus communication unit 24 is arranged at the center, and the power receiving unit 20, the PCT unit 21 and the transformer circuit unit 22 are respectively arranged on the left side of the bus communication unit 24. , A power receiving unit 20 and a transformer circuit unit 23 with a PCT bypass disconnector are arranged. The order of the left and right arrangement can be arbitrarily determined. The transformer circuit unit 23 with the disconnector for the PCT bypass is characterized in that it can be configured as shown in FIG. 14E, and can also be provided with a CT.

In the cubicle type gas insulated switchgear shown in FIG. 14, when the GPT is connected to any of (F), (G), and (H), it has a six-sided configuration shown in FIG. It has a small minimum installation area.

The dimensions of the GIS according to Conventional Examples 2 and 3 and the cubicle-type gas insulated switchgear according to the present invention shown in FIG. 15 are compared for the case with one GPT and the case without GPT. The numerical values in the case of performing this are shown in the table.

[0030]

[Table 1]

[0031]

As can be seen from the above description, claim 1
According to the cubicle type gas insulated switchgear, the power receiving unit has the pole of the circuit breaker installed horizontally and a pair of disconnectors with grounding switch arranged vertically above the circuit breaker. Since the size of the gas insulated switchgear in the depth direction is reduced and the circuit breaker is placed horizontally, it is easy to pull out the pole portion when replacing the contacts. In addition, PCT unit
Incorporating a disconnecting switch with a grounding switch for disconnection and a disconnecting switch with a grounding switch for PCT bypass makes it easier to support single-line diagrams without a disconnector with a grounding switch in the bus connecting circuit.
It is no longer necessary to separately provide a disconnector with a ground switch for the PCT bypass. Furthermore, PCT is used for the transformer circuit unit.
Incorporating a disconnecting switch with a grounding switch for bypass facilitates the use of a single line diagram for bus connection with a disconnecting switch with a grounding switch, eliminating the need for a separate disconnecting switch with a grounding switch for PCT bypass. Was. Furthermore, since the power supply side and the load side disconnectors of the PCT are provided in the bus connecting unit and one GPT is accommodated, it is not necessary to provide a separate GPT unit in many cases.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a power receiving unit according to a cubicle type gas insulated switchgear according to the present invention.

FIGS. 2A and 2B relate to a cubicle type gas insulated switchgear according to the present invention, wherein FIG. 2A is a configuration diagram of a PCT unit, and FIG.

FIG. 3 is a configuration diagram of a transformer circuit unit according to the cubicle type gas insulated switchgear according to the present invention.

FIG. 4 is a configuration diagram of a transformer circuit unit with a bypass disconnector according to the cubicle type gas insulated switchgear according to the present invention.

FIGS. 5A and 5B relate to a cubicle type gas insulated switchgear according to the present invention, wherein FIG. 5A is a configuration diagram of a bus connecting unit, and FIG.

FIG. 6 is a configuration diagram of a GPT unit according to the cubicle type gas insulated switchgear according to the present invention.

FIG. 7 is a single line connection diagram of a PCT unit according to the cubicle type gas insulated switchgear according to the present invention.

FIG. 8 is a single line connection diagram of a transformer circuit unit according to the cubicle type gas insulated switchgear according to the present invention.

FIG. 9 is a single-line connection diagram of a transformer circuit unit with a bypass disconnector in the cubicle type gas insulated switchgear according to the present invention.

FIG. 10 is a single line connection diagram of a bus connecting unit in the cubicle type gas insulated switchgear according to the present invention.

FIG. 11 is a single-line connection diagram showing a combination 1 of each unit in the cubicle-type gas insulated switchgear according to the present invention.

FIG. 12 is a single-line connection diagram showing a combination 2 of each unit in the cubicle type gas insulated switchgear according to the present invention.

FIG. 13 is a single-line connection diagram showing a combination 3 of each unit in the cubicle type gas insulated switchgear according to the present invention.

FIG. 14 is a single-line connection diagram showing a combination 4 of each unit in the cubicle type gas insulated switchgear according to the present invention.

FIG. 15 relates to a cubicle type gas insulated switchgear according to the present invention, and shows combination 4 of each unit.
(A) is a plan view, (b) is a front view, and (c) is a right side view.

16A is a side view of a power receiving unit, FIG. 16B is a front view of a power receiving unit, FIG. 16C is a side view of a primary part of a transformer, and FIG. 16D 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.

17A is a perspective view of an external appearance, FIG. 17B is a configuration diagram of a power receiving unit, and FIG.
The block diagram of a T unit.

18A is a configuration diagram of a power receiving panel, and FIG. 18B is a configuration diagram of a primary transformer panel, according to GIS according to Conventional Example 3. FIG.

FIG. 19 is a perspective view of a GIS according to Conventional Example 4.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 ... Power receiving unit 21 ... PCT unit 22, 23 ... Transformer circuit unit 24 ... Busbar communication unit 25 ... GPT unit 26 ... Circuit breaker 27, 28 ... Disconnector with earthing switch 44a-44c ... Disconnector with earthing switch 55 ... GPT 57, 58 ... disconnector

Claims (1)

[Claims] 1. A power receiving unit, a PCT unit, a transformer circuit unit, a busbar communication unit, and a GPT unit are configured by housing an electric device inside a housing, and the power receiving unit includes: The pole of the circuit breaker is placed horizontally and a pair of disconnectors with ground switch is arranged vertically above the circuit breaker, and the PCT unit has a disconnector with ground switch for PCT disconnection. And a disconnector with a grounding switch for a PCT bypass. The transformer circuit unit accommodates a disconnector with a grounding switch for a PCT bypass. The bus connecting unit includes a bus side and a load side of the PCT. A cubicle-type gas insulated switchgear accommodating a disconnector with a ground switch and a GPT.