JPH0750965B2 - Gas insulated switchgear - Google Patents

Description

TECHNICAL FIELD The present invention relates to a gas insulated switchgear, and more particularly to a gas insulated switchgear of a double main bus system.

[Prior Art] Generally, a gas-insulated switchgear of this type is configured to have an instrument transformer PT for measuring the voltage of each main bus.

The conventional instrument transformer PT in the gas-insulated switchgear has a three-phase batch type main bus with three phases arranged in the axial direction and the instrument transformers PT for each phase are directly connected. For this reason, the axial length of the expensive main bus line becomes long, and the installation area of the gas insulated switchgear increases accordingly.

On the other hand, in the gas-insulated switchgear disclosed in Japanese Patent Laid-Open No. 56-103908, an instrument transformer PT is provided on each side of the breaker of the gas-insulated switchgear unit for connecting busbars connected to the main busbar. I was connected.

[Problems to be Solved by the Invention] Since the instrument transformer PT in the conventional gas insulated switchgear is arranged as described above, the circuit breaker horizontally arranged in the direction orthogonal to the main bus bar is A space for the transformer PT for the instrument must be secured between the main bus and the other main bus, and the axial length of the branch bus that connects the circuit breaker and the main bus must be increased to provide a gas-insulated switchgear. The installation area was increased.

An object of the present invention is to provide a gas insulated switchgear with a reduced installation area.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides two gas-insulated switchgear units, in which a circuit breaker is arranged on different sides of a main busbar, in a gas-insulated switchgear unit connected to a main busbar. The equipment unit is provided with an instrument transformer PT connected between the main busbar located far from the circuit breaker and the busbar disconnector.

[Operation] Since the gas-insulated switchgear according to the present invention has the above-described structure, the instrument transformers PT for both main buses are arranged in two gas-insulated switchgear units in a distributed manner. Since each gas-insulated switchgear unit has an instrument transformer PT for the main bus that is far from the circuit breaker, the circuit breaker can be placed close to the main bus that is closer to the circuit breaker. Therefore, unlike the conventional case, it is possible to obtain a gas-insulated switchgear having a small installation area without securing a space in the same portion or requiring a branch bus bar having a large axial length.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

Fig. 1 is a plan view of a gas-insulated switchgear, in which four gas-insulated switchgear units with dual main buses 1 and 2 are arranged almost horizontally.
These insulated switchgear units, constructed by connecting A, B, C and D, consist of two groups of circuit breakers arranged on different sides of the double main bus. That is, the double main bus
A group consisting of gas-insulated switchgear units B and C in which circuit breakers 7B and 7C are arranged on the main bus 1 side of 1, 2 and gas-insulated switchgear units A and circuit breakers 7A and 7D arranged on the main bus 2 side. And a group consisting of D. In this embodiment, these 2
When selecting one gas-insulated switchgear unit from each group, that is, gas-insulated switchgear unit A for transmission lines and gas-insulated switchgear unit B for connecting busbars, and installing transformers 11A and 11B for meters respectively in these units Will be described.

FIG. 2 is a front view of the gas-insulated switchgear unit A for transmission lines, which is taken along the line II-II in FIG.

The circuit breaker 7A arranged on the main bus 2 side of the double main bus has current transformers 6A, 8A and earthing switches 5A, 9A at both ends, and one end of the breaker 7A is connected via the bus disconnector 3A to the main bus. 2 and to the main bus 1 via the bus disconnector 4A, and the other end is connected to the bushing 10A and the lightning arrester 16A. A branch line 17A is connected between the main busbar 1 and the busbar disconnector 4A farther from the circuit breaker 7A, and an instrument transformer 11A is connected to the branching portion 18A of the branch busbar 17A and the main busbar 1 is grounded. Switch 12A is connected.

FIG. 3 is a front view of a bus-insulated gas-insulated switchgear unit B along line III-III in FIG.

The breaker 7B arranged on the main bus 1 side of the double main bus has current transformers 6B and 8B and ground switches 5B and 9B at both ends, and one end of the breaker 7B is connected to the main bus via the bus disconnector 4B. 1, and the other end extends coaxially with the circuit breaker 7B and is then bent upward,
Further, the connecting busbar 13 is folded back in parallel with the circuit breaker 7B.
It is connected to B, and this connecting busbar 13B is connected to the main busbar 2 via the busbar disconnector 3B and the branch busbar 17B. An instrument transformer 11B and a ground switch 12B are connected to the branch portion 18B of the branch bus 17B.

In this way, pay attention to the gas-insulated switchgear units A and B in which the circuit breakers 7A and 7B are arranged on different sides of the double main buses 1 and 2, respectively. Since the instrument transformers 11A and 11B are provided between the main busbar and the busbar disconnector that are far from the main busbar and 7B, respectively, the circuit breakers 7A and 7B can be placed close to the main busbars 1 and 2, and the installation area Contribute to reduction. Moreover, if the transformers for three-phase meters are directly connected to the main buses 1 and 2 as in the conventional case, the axial length of the main buses 1 and 2 increases, but as shown in Fig. 1, each gas insulated switchgear unit Since the instrument transformers 11A and 11B are connected to each A and B,
The instrument transformers 11A and 11B do not increase the axial length of the main buses 1 and 2. In addition, normally, an insulating spacer is provided between the branch busbars 17A, 17B and the instrument transformers 11A, 11B, but by horizontally arranging the instrument transformers 11A, 11B, the insulating spacers can also be placed vertically. it can. Therefore,
Even if the metal particles are mixed, they are less likely to adhere to the insulating spacer and deteriorate the insulating performance.

FIG. 4 is a plan view of a gas-insulated switchgear in the case where a gas-insulated switchgear unit A for transmission lines and a gas-insulated switchgear unit C for transformers are selected to connect a transformer for meters.

The gas insulated switchgear unit A for transmission lines is the same as that shown in FIG.

As shown in FIG. 5, the transformer gas insulated switchgear unit C is configured by arranging a circuit breaker 7C on the main bus 1 side of the double bus, and a current transformer 6C at both ends of the circuit breaker 7C. 8C and grounding switches 5C and 9C are provided, one end of which is connected to a transformer (not shown) via a cable head 14, and the other end is connected to the main bus 1 via a busbar disconnector 4C and a busbar disconnector. It is connected to the main bus 2 via 3C and the branch bus 17C.
A ground switch 12C and an instrument transformer 11C are connected to a branch portion 18C of the branch busbar 17C.

In this way, the gas-insulated switchgear unit A for power lines and the gas-insulated switchgear unit C for transformers are connected to the instrument transformers 11A and 11A.
Even when C is connected, the same effect as in the previous embodiment can be obtained. Moreover, the two gas-insulated switchgear units A and C in this embodiment are, as is clear from the comparison between FIG. 2 and FIG. 5, made from the circuit breakers 7A and 7C including the current transformer and the installed switch to the main bus.
Standardization can be achieved with the same configuration up to 1 and 2.

FIG. 6 is a plan view of a gas-insulated switchgear according to another embodiment of the present invention, which is basically the same as FIG. 1, but the specific structure of the gas-insulated switchgear unit B for connecting busbars is different. is doing.

This gas-insulated switchgear unit B for connecting busbars, as shown in the front view of FIG. 7, includes current transformers 6B, 8B and ground switch 5B,
The configurations of the circuit breaker 7B including 9B, the main busbar 1, and the busbar disconnector 4B are the same as in the case of FIG. However, the configuration between the other end of the circuit breaker 7B and the main bus 2 is slightly different. That is, circuit breaker 7B
The connecting busbar 15B that connects between the busbar disconnector and the busbar disconnector 3B is a circuit breaker 7B.
However, the position is not directly above the circuit breaker 7B but is diagonally above the circuit breaker 7B as shown in FIG. 8 which is a rear view of FIG.

According to such a configuration, as in the embodiment shown in FIG. 1, since both instrument transformers 11A and 11B are provided on the opposite sides of the main buses 1 and 2, respectively, the main buses 1 and 2 and the circuit breaker are By placing 7A and 7B close to each other, the installation area can be reduced. In addition, the gas-insulated switchgear unit A, B in the instrument transformer 1
Since 1A and 11B are connected, there is no need to increase the axial length of the main buses 1 and 2 as in the case where the instrument transformer is directly connected to the main buses 1 and 2. In addition, in this embodiment, the connecting busbar 15B connecting between the main busbar 2 on the side far from the circuit breaker 7B and the circuit breaker 7B is
Since it was placed diagonally above circuit breaker 7B, circuit breaker 7B
A space is formed above the busbar disconnector 4B, and when these switchgear devices 7B, 4B are abnormal, they can be disassembled without removing the connecting busbar 15B.

As can be seen from the description of each of the above-mentioned embodiments, in the configuration in which the gas-insulated switchgear units are arranged on both sides of the double main busbar, respectively, between the main busbar and the busbar disconnector located farther from the breaker of those units. It suffices to connect an instrument transformer, and if this configuration is satisfied, an arbitrary gas-insulated switchgear unit can be selected to connect the instrument transformer.

[Effects of the Invention] As described above, the present invention provides an instrument transformer between the main busbar and the busbar disconnection of the gas-insulated switchgear unit located on both sides of the double mainbusbar, which is farther from the circuit breaker. Since the connection is made, the main busbar and the circuit breaker can be arranged close to each other without increasing the axial length of the main busbar, whereby a gas-insulated switchgear having a reduced installation area can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view of a gas-insulated switchgear according to an embodiment of the present invention, and FIGS. 2 and 3 are lines II-II and II of FIG.
A front view of each gas insulated switchgear unit along the line I-III, FIG. 4 is a plan view of a gas insulated switchgear according to another embodiment of the present invention, and FIG. 5 is a line VV of FIG. FIG. 6 is a front view of a gas insulated switchgear unit, FIG. 6 is a plan view of a gas insulated switchgear according to still another embodiment of the present invention, and FIGS. 7 and 8 are lines VII-VII and VIII of FIG. FIG. 5 is a plan view and a rear view of the gas-insulated switchgear unit taken along line VIII. A, B, C, D …… Gas-insulated switchgear unit, 1,2 …… Main busbar, 3A, 3B, 3C, 4A, 4B, 4C …… Bus disconnector, 7A, 7B, 7C ……
Circuit breakers, 11A, 11B, 11C …… Instrument transformers, 17A, 17B, 17C…
… Branch bus, 18A, 18B, 18C …… Branch section.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-56-103908 (JP, A) Actually opened 63-182611 (JP, U) Actually opened flat 2-317 (JP, U)

Claims (3)

[Claims] 1. A double main bus bar arranged side by side, a gas-insulated switchgear unit having a circuit breaker arranged on one side of the double main bus bar, and a circuit breaker arranged on the other side of the double main bus bar. A gas-insulated switchgear comprising another gas-insulated switchgear unit, wherein both of the gas-insulated switchgear units have a busbar disconnector, and are connected to the double main busbar through the busbar disconnector. The gas-insulated switchgear is characterized in that each of the gas-insulated switchgear units has an instrument transformer connected between the main busbar far from the circuit breaker and the busbar disconnector. 2. The gas-insulated switchgear according to claim 1, wherein the instrument transformer is arranged substantially horizontally. 3. The grounding switch for connecting the branch busbar having a branch between the busbar disconnector and the main busbar, and grounding the main busbar to the branching part, and the transformer for instrument according to claim 1. A gas-insulated switchgear characterized by connecting to.