JPS6115504A - Gas insulated switching device - 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] [Technical Field of the Invention] The present invention relates to gas-insulated switchgear, and more specifically, lightning arresters and meter-use devices that require in-house withstand voltage tests of normal earth voltage. It relates to gas-insulated switchgear that consists of stationary equipment such as transformers and switchgear such as disconnectors and circuit breakers that require lightning withstand voltage tests and commercial frequency withstand voltage tests.

[Conventional technology]

Fig. 1 shows a conventional device of this type, in which a lightning arrester l and a disconnector are separated from each other by an insulating spacer 3, and a conductor is connected through a contact surrounded by an electric field-mitigating shield. S electrically connects the lightning arrester l and the disconnector. A circuit breaker 6 is coupled to the disconnector.

When carrying out in-house test items such as a lightning innocence withstand voltage test and a commercial frequency withstand voltage test on the disconnector and circuit breaker 6' with the above configuration, the lightning arrester l
Cut it out and attach the blank tank 7 to the part of the insulating spacer 3.
The test was conducted by combining the .

On the other hand, the normal earth voltage for lightning arrester l/Iiii~ll
The in-house withstand voltage test of E was conducted by connecting the test tank 7 and the test bushing 9 to the lightning arrester l which had been removed from the disconnector, as shown in FIG.

As described above, in order to avoid the troublesome work of removing the lightning arrester l from the switchgear and connecting it to the test tank T, test bushing, and even megura tank 7, etc., each time a test is carried out, the The structure of the figure was proposed.

That is, in FIG. 7, a third disconnector core a is disposed between a lightning arrester l and a disconnector core with an insulating spacer 3.3a for gas division interposed therebetween. The same reference numerals as in FIG. 1 indicate the same parts.

With this configuration, a lightning impulse withstand voltage test and a commercial frequency withstand voltage test can be conducted with the U-th disconnector Xa open, without removing the number of lightning arresters tf. Further, the withstand voltage test of the normal earth voltage of the single lightning arrester 1 can be conducted with the first disconnector 2a closed and the first disconnector 2a open.

However, the above configuration has the disadvantage that the cost is increased because the third disconnector 2a is required, and the switching device as a whole becomes large.

[Summary of the invention]

This invention was made in view of the above-mentioned circumstances, and by providing a small and inexpensive connection/disconnection mechanism with a withstand voltage function of normal earth voltage to a stationary device such as a lightning arrester, the stationary device can be connected to a switch. To provide gas-insulated switchgear that can perform a predetermined in-house withstand voltage test without removing it from the equipment.

[Embodiments of the invention]

FIG.
An insulating rod 15 coaxially connected to a rod-shaped conductor /+ connecting between the contact t and the contact 13 of the disconnector 1 is slidably supported on a bearing 10.

The insulating rod 13 is capable of withstanding normal ground voltage, and is slidable in the axial direction by operation from outside the container while an oil seal is applied between it and the bearing 10 to maintain airtightness of the lightning arrester l. The conductor is detachably connected to the conductor by a screw. Therefore, the conductor 9 and the insulating rod 15 can be attached and detached by manually rotating the insulating rod by an external operation.

/6 is an insulating support provided on the lightning arrester l.

In addition, the same reference numerals as in FIG. 1 indicate the same parts.

Next, the operation will be explained.

First, when testing the disconnector l, as shown in Fig.
Connect F and perform the normal earth voltage withstand voltage test. This Togi M! As mentioned above, the three-edge rod can withstand this voltage.

When performing a lightning impulse withstand voltage test or a commercial frequency withstand voltage test of the disconnector unit, circuit breaker 6, etc., as shown in Figure 6, the insulating rod l! Move the conductor l to the right and connect the conductor l to the contact f.
By opening from 2, it is possible to test the withstand voltage of disconnector 4 and 4.

In addition, when transporting the above device, the insulating gas in the disconnector l is removed, only the insulating rod /l is removed, and the hole in the support member it is hermetically closed with the lid 17, as shown in FIG. . The lightning arrester l can then be refilled with insulating gas during on-site installation. As mentioned above, the insulating rod 15 is operated manually.

As described above, the lightning arrester 1 can be subjected to a predetermined internal withstand voltage test without being disconnected from the disconnector 1.

The above is for the case where the stationary device is a lightning arrester, but as shown in Figure g, the same applies even if it is an instrument converter/1, and the switch/? An insulating rod i! and the instrument transformer/g are connected. rr
A similar effect can be obtained by slidably disposing the IC coaxially coupled rod-shaped conductor/F.

〔Effect of the invention〕

As described above, the present invention has the advantage that each predetermined test can be performed without removing a static device such as a lightning arrester from the main body, and the structure is simple and inexpensive.

[Brief explanation of drawings]

FIG. 1 is a front sectional view of the conventional device, FIGS. 2 and 3 are front sectional views showing the condition of the device in FIG. 1 during a withstand voltage test, and FIG. 9 is a front sectional view of another conventional device. FIG. S is a front sectional view of one embodiment of the present invention, FIGS. 6 and 7 are front sectional views showing the state of the embodiment of FIG. 3 during withstand voltage test and transportation, respectively. FIG. FIG. 3 is a front sectional view of a main part of another embodiment. /...Surge arrester (static device), Co...Disconnector (switch), 3
0φ insulation spacer, +-・shield, 6・・breaker, 1
0...Bearing, l/...Supporting member, /3...Contact, /Hiro...Conductor, 13...Insulating rod, /7...Lid,
ig...Instrument transformer (static device), l? ...Switch. In each figure, the same reference numerals indicate the same or corresponding parts. Mother-in-law 1 figure Most 2 figures Figure 3 Flame 8 figure Procedural amendment “Spontaneous”

Claims (6)

[Claims] (1) Gas-insulated switchgear comprising a movable rod-shaped conductor that electrically connects and separates the switch and stationary device, and an insulating rod that is coaxially connected to this conductor and can be operated from outside the gas-filled container. device. (2) The gas insulated switchgear according to claim 1, comprising an insulating rod that is detachable from the conductor. (3) The gas insulated switchgear according to claim 2, comprising an insulating rod screwed onto the conductor. (4) The gas-insulated switchgear according to claim 1, wherein the switch is a disconnector. (5) The gas-insulated switchgear according to claim 1, wherein the static device is a lightning arrester. (6) Claim 1 in which the stationary device is a voltage transformer
Gas insulated switchgear as described in section.