JPS5826245B2 - Dielectric strength test equipment for closed type switchgear equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dielectric strength testing device in which a phase conductor to be tested can be freely switched from outside the housing in a three-phase complementary closed type switching equipment.

Dielectric strength tests are conducted on closed switchgear equipment prior to operation.

In each phase separation type switchgear, a test housing is flange-connected to the switchgear, and a high voltage conductor and a ground conductor are accommodated within the housing.

A high voltage conductor is connected to the bushing and high voltage is applied thereto.

In the case of a three-phase supplementary closed type switchgear, three bushings are provided, and high pressure is applied to these bushings either sequentially or simultaneously.

To obtain the necessary spacing in air, the bushings must be arranged in a slanted star configuration, which reduces the space required for the test.

SUMMARY OF THE INVENTION An object of the present invention is to provide a test device that can easily conduct a dielectric strength test of a three-phase supplementary force-type closed type switchgear equipment, and that requires less space.

The present invention will be explained below based on illustrated embodiments.

FIG. 1 shows a dielectric strength testing device for a closed type switchgear 2. The switchgear 2 is equipped with a tubular metal capsule 3 and has a button, and its internal space 4 contains sulfur hexafluoride SF'. A gaseous insulating medium, such as a gas, is housed, as well as three-phase high voltage conductors 5, 6 and 7, supported relative to the capsule 3 by support insulators (not shown).

The three-phase conductors 5, 6 and 7 are located at the vertices of a regular triangle, respectively, as shown in FIG.

The test device 1 is equipped with a test flange 8, the housing of which is connected with a flange 9 to a flange 10 of the equipment to be tested, so that the housing 8 and the capsule 3 are connected to each other in a gas-tight manner.

The test housing 8 encloses a high voltage conductor 11 and a ground conductor 12 which can be coupled to the equipment under test 2 with three phase conductors 5, 6 and 7.

As is clear from the figure, there are 3
Fixed high-voltage conductors of the phases are arranged, and movable contacts 11 are provided so that high voltage can be sequentially introduced to these conductors.

The contact 11 is adapted to be operated via a shaft 13 by an operating device placed outside the flange 8.

The contact 11 conducting the high voltage is attached to a metal ring 14 which is connected to the shaft 13 via a support insulator 15.
The high-voltage bushing 16 introduced into the test housing 8 is electrically connected to the test housing 8 via a sliding contact 17 .

The high voltage bushing 16 may also be configured as a cable terminal.

A test voltage is applied to terminal 18 of high voltage bushing 16.

Inside the test flange 8, the shaft 13 is equipped at its free end with an arcuate collector 19, which is U-shaped and whose free end electrically bridges the two poles and simultaneously Ground.

In the situation shown in FIG. 2, the high voltage conductor 6 is under test;
Conductors 5 and 7 are grounded.

By rotating the shaft 13 by 120 degrees, a high voltage is applied to the adjacent conductor 7.

Furthermore, by rotating the shaft 13 by 120°, a high voltage is applied to the conductor 5, the conductors 6 and 7 being electrically bridged by the current collector 19 and grounded.

This test device is particularly suitable for high-voltage switchgear installations where there is no earth ground belonging to the conductors 5, 6 and 7.

In the embodiment shown in FIG. 1 and FIG. 2, a second contact 19 that conducts ground potential is directly attached to the contact 11 that conducts high voltage, and the contacts 11 and 19 are connected to a common operating device. It is designed to be operated with.

Furthermore, in the illustrated embodiment, the shaft 13 of the actuator introduced into the test housing 8 constitutes a ground conductor.

The actuator is attached to the part of the test housing 8 opposite the flange 9.

In the following other embodiments, the same parts are given the same reference numerals.

The embodiment of FIGS. 3 and 4 includes a manipulator having a test housing mounted ring 22 with rollers 20 in rails 21. The embodiment of FIGS.

Ring 22 is grounded and operatively corresponds to arcuate collectors 19a and 19b of FIG.

It supports two contacts 19ah and 19b at ground potential.

The ring 22 furthermore supports a supporting insulator 23 of the contact 11 which carries the high voltage.

Another similar embodiment is shown in FIGS. 5 and 6, in which the contact 11 is electrically connected via a connecting rod 24 to a rotary contact 25, which in turn is connected to a bushing 26 or 27. has been done.

In this case, the operating device outside the test housing 8 is connected to the ground potential button and the high voltage conductor 29 via the insulator 28.

At that time, the potential is changed to high voltage through the sliding contact 30,
1 and becomes equal to the ground potential.

[Brief explanation of drawings]

The figures show embodiments of the apparatus of the present invention, and FIGS. 1, 3 and 5 are respectively 1. The longitudinal sectional views of the second and third embodiments, FIGS. 2, 4 and 6 are plan views of the lower part of FIGS. 1, 3 and 5, respectively. 5.6, 7... 3-phase conductor, 8... test flange, 9, 10... flange, 11...
...High voltage contact, 12...Grounding conductor, 16...High voltage conductor, 19...Grounding contact.

Claims (1)

[Claims] 1. Having a test housing that can be connected by a flange to the three-phase complementary sealed switchgear to be tested, and having an end face that is inserted through the housing through a bushing and that can be slidably connected to the insertion end. The high-voltage conductor is inserted through a gas-tight seal to form a branched contact whose insertion end simultaneously contacts two phases of the three-phase conductor to be tested, and sequentially selectively connects two phases of the three-phase conductor. and a grounding contact rotatably disposed so as to be able to come into contact with the grounding contactor, and further supported by the grounding contactor via an insulator, and one end of the grounding contactor contacts one phase conductor other than the two phases. A dielectric strength testing device for closed type switching equipment, comprising a high-voltage conductive member that forms a high-voltage contact and also forms a sliding part that always comes into contact with the end surface of the high-voltage conductor when the grounding contact rotates.