JPS61124207A - Gas insulated switchgear - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a gas insulated switchgear, and particularly to a gas insulated switchgear that connects gas insulated equipment and three single-phase transformers.

[Background of the invention]

Gas insulated switchgear containers are generally grounded to ensure safety even if a worker comes into contact with the container when energized. The grounding method uses interphase shorting bars to electrically connect the phases at both ends of the gas-insulated switchgear, allowing electromagnetic induction current to flow through the container, mitigating leakage to the outside of the container, and reducing local temperature rises such as on the frame. There is a method to do this. (IEEJ technical report (■ section)
No. 163 P, 63) Fig. 4 is a plan view of a gas insulated switchgear showing this conventional example, and Fig. 5 is a front view of Fig. 4, showing the three-phase transformer 1 and gas insulated equipment 3. Between the three-phase transformer 1 and the two gas-insulated busbars, and between the gas-insulated equipment 3 and the gas-insulated busbar 2, the container electromagnetic induction current of the gas-insulated busbar 2 is connected to the three-phase transformer 1 and the gas-insulated busbar 2. equipment 1 and gas insulated equipment 3
The three phases are electrically connected at both ends by an interphase shorting bar 5 in order to allow the container electromagnetic induction current to flow into the container of the gas insulated bus 2. According to the above, since the vessel induced current flows through the phase-to-phase shorting bar 5 at the end of the gas insulated bus 2 between the vessel and the face, the pedestal 6 does not need to be particularly insulated from the ground. Therefore, it is difficult to electrically connect the gas insulated bus container near the transformer using an interphase shorting bar.

FIG. 6 is a plan view of a conventional gas insulated switchgear,
A case is shown in which three single-phase transformers 1' are used. Conventionally, in the ultra-high voltage class, the phase-to-phase of the single-phase transformer 1' of each phase was I.
It is difficult to electrically connect the phases of the gas insulated bus 2 near the single-phase transformer 1 with the interphase shorting bar because of the thermal expansion of the interphase shorting bar due to temperature rise, etc. As shown in this figure, the three-phase gas insulated bus 2 is electrically connected by an interphase shorting bar 5 at the shortest position, and the pedestal 8 on the transformer side from that position is connected to the ground by an insulator 9. is electrically insulated to prevent induced current from flowing into the pedestal, thereby preventing a local temperature rise. However, in the ultra-high voltage class, the distance from the installation position of the phase-to-phase shorting bar 5 to the single-phase transformer 1' is long, the number of mounts 8 is large, and the number of insulation points on the mounts 8 is large, making installation difficult. It takes time to perform insulation confirmation tests, etc.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an insulated switchgear that does not require insulating the frame of a gas insulated bus bar connecting a single-phase transformer and gas insulated equipment from the ground.

[Summary of the invention]

The main point of the present invention is to have a structure in which the phase-to-phase shorting bar can be attached as a long object, thereby eliminating the need to insulate the frame of the gas-insulated bus bar that connects the single-phase transformer and gas-insulated equipment from the ground.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1, 2, and 3. The single-phase transformer 1' and the container of the gas insulated bus 2 are electrically insulated by an insulator 4. The containers of the gas insulated busbars 2 of each phase are electrically connected by interphase shorting bars 5. As shown in FIG. 2, the interphase shorting bar 5
The structure is such that it penetrates the firewall 7, making it as short as possible and having a low impedance so that an electromagnetic induced current can flow effectively.

In addition, the phase-to-phase shorting bar 5 is longer than in the case of a three-phase transformer, and the strength is more affected by wind, snow, etc., but fire safety l! By adopting a structure in which the interphase shorting bar 5 is supported by the through holes 17, the strength of the interphase shorting bar 5 can also be improved.

Further, by minimizing the effects of wind, snow, etc., and using a substantially cylindrical interphase shorting bar 5 with a strong cross section, the overall strength will be increased.

As described above, when the interphase shorting bar 5 becomes long, the temperature rises due to the induced current flowing through the interphase shorting bar 5 and the influence of direct sunlight.

The thermal expansion of the interphase shorting bar 5 becomes large, and if the interphase shorting bar 5 is directly fixed to the container, due to the effects of thermal contraction, thermal expansion, etc.
The tightening part becomes loose, resulting in poor contact and a local temperature rise at the contact part. Figure 3 shows the interphase shorting bar 5 connected to the U-shaped bolt 10.
Therefore, the gas insulated bus bar 2 is attached to the container so as to be movable in the axial direction.

Further, the electrical connection is also structured to be movable in the axial direction using a flexible conductor 11.

〔Effect of the invention〕

According to the present invention, there is no need to insulate the pedestal of the gas-insulated busbar, and the busbar is strong despite its long length, and can absorb thermal contraction and thermal expansion, which have a large effect due to its long length.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an embodiment of the present invention, Fig. 2 is a view from the ■-■ arrow in Fig. 1, Fig. 3 is a detailed view of the ■ part in Fig. 2, and Fig. 4 is a conventional gas FIG. 5 is a front view of FIG. 4, and FIG. 6 is a plan view of a conventional gas-insulated switchgear. 1'...Single-phase transformer, 2...Gas insulated bus bar, 4...
...Insulator, 5...Interphase short circuit bar, 7...Fire wall.

Claims (1)

[Scope of Claims] In a gas-insulated switchgear comprising a gas-insulated bus bar connecting one or three single-phase transformers and gas-insulated equipment such as a circuit breaker, a disconnector, a grounding switch, etc., and the gas-insulated equipment. , insulating between the container of the single-phase transformer and the container of the gas-insulated bus, and electrically connecting the container of the gas-insulated bus connected to the single-phase transformer with an interphase shorting bar near the insulation part; A gas insulated switchgear characterized by: 2. In claim 1, the inter-phase shorting bar is arranged to penetrate a fireproof wall arranged between each phase transformer of the three single-phase transformers, and the length of the inter-phase shorting plate is A gas insulated switchgear characterized by having the shortest possible time. 3. The gas insulated switchgear according to claim 2, wherein the interphase shorting bar is supported by the through portion. 4. In claim 1, the interphase shorting bar is made of a low impedance material,
A gas insulated switchgear characterized by having a substantially cylindrical shape. 5. The gas insulated device according to claim 1, wherein the interphase shorting bar is attached to the gas insulated bus bar container using a mounting method that allows it to move in the axial direction, and the electrical connection is made by a flexible conductor. Switchgear.