JPH0318153B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a test device for a bushing that connects a gas-insulated switchgear and a direct-coupled oil-immersed transformer.

A conventional bushing test device of this type will be explained with reference to FIG. The test bushing 1 is installed at the opening of a mounting lid 4 covering an oil tank 3 filled with insulating oil 2, with an expansion chamber 6 sandwiched between an oil side mounting flange 5 and a gas side mounting flange 7. By attaching it to the top surface of the oil tank 3.
In addition, the gas side mounting flange 7 of the test bushing 1
Gas connection box 8 is fixed to. Next, after electrically connecting the center conductor 9 of the test bushing 1 and the test bushing 10 with the connection lead 11, the gas mounting lid 12 attached to the test bushing 10 is connected to the gas connection box 8. Once installed, the gas connection box 8 is hermetically sealed, a gas insulator 13 is sealed inside, and the sample bushing is tested.

The conventional test equipment requires a test bushing 10 that uses gas and has a higher insulation class than the test bushing 1. In addition, in order to replace the test bushing 1 when testing multiple test bushings, it is necessary to collect the gas insulating medium 13, remove the test bushing 10, and then remove the gas mounting lid 12 and the gas connection box 8. There must be. In addition, test bushing 1
When the is a horizontal mounting type, the expansion chamber 6 is installed in order to absorb the volume change of the insulating oil in the test bushing 1.
is provided. Therefore, when setting the test bushing 1 vertically, it is necessary to connect the pressure equalizing pipe 1 to the expansion chamber 6.
It is necessary to attach the feeding tank 15 via 4. For this reason, it was also necessary to adjust the oil level after removing the test bushing 1, which resulted in a drawback that the work required to replace the test bushing 1 was large and took a long time.

The purpose of the present invention is to eliminate the above-mentioned drawbacks, to provide a bushing test device that allows the work of attaching a test bushing to an oil tank or the like of a test device to be simple and takes a short time, and that can test a plurality of test bushings at the same time. It is about providing.

The present invention involves attaching a test bushing to the top of an oil tank, covering half of the test bushing in advance with a gas tank attached to the gas side mounting flange of the test bushing, and filling this gas tank with a gas insulating medium. Insert multiple test bushings with gas tanks attached as described above into the oil tank from the side, then electrically connect the test bushings and test bushings in the oil tank, and insulate the oil tank with insulating oil. The test is conducted by satisfying the following criteria.

Hereinafter, an embodiment of the bushing test device of the present invention will be described with reference to FIGS. 2 and 3.
This will be explained using figures.

The test bushing 16 for oil is attached to the upper part of the oil tank 3 with a fitting 17.
A connection conductor 19 is attached to the oil-submerged terminal 18 of the test bushing 16 for electrical connection with the oil-submerged terminal 22 of the test bushing 1 . When the test bushing 1 is installed in the oil tank 3 as described later, this connection conductor 19 is connected to the oil-side terminal 18 of the test bushing 16 even if there is a dimensional variation due to the tolerance of the installation dimensions. The contact piece is supported by a spring and has a flexible structure so that there is no problem in connection.

Next, before the plurality of sample bushings 1 are attached to the oil tank 3, the gas tank 20 is attached to the gas side mounting flange 7 of the sample bushing 1 in advance, and the gas insulating medium 13 is sealed inside. After that, the oil side mounting flange 5 of the test bushing 1 is attached to the mounting bracket 21 with the expansion chamber 6 sandwiched therebetween.
Attach to. The test bushing 16 and the test bushing 1 can be connected by simply inserting the test bushing 1 into the oil tank 3 and connecting the connection conductor 19 without having to enter the oil tank 3 to perform the connection work. connection is possible. Thereafter, the oil tank 3 is filled with insulating oil 2, and the test preparation is completed.

The voltage applied to the test bushing 1 is supplied to the test bushing 16, the connection conductor 19, the test bushing 1, and the grounded mounting bracket 21, and the test bushing 1 is tested.

According to this embodiment, the test bushing 16 for oil is used instead of the test bushing for gas, so a gas connection box is not required, and the test bushing 16 for oil is connected to the oil tank 3. This test bushing 16 is easy to install.
Since there is no work to be done after removing the device, there is an effect of making the test preparation work easier and shorter. In addition, the gas connection box 8 is no longer necessary, and the gas tank 2 can be used instead.
0 has a small size, so the amount of gas insulating medium 13 is small, which has the effect of shortening gas filling and recovery time. Moreover, this gas tank 20 is also economical because it can be used as a container for gas sealing tests. Furthermore, since a plurality of test bushings 1 can be tested in one test, compared to the case where test bushings 1 are replaced one after another, the work is simplified and the test preparation time can be significantly shortened. Also,
Since the test bushing 16 for oil is used instead of the test bushing for gas, it is possible to perform the same test as for the oil-to-oil bushing without wall.

As described above, according to the bushing test device of the present invention, the work of attaching the test bushing to the oil tank or the like of the test device is simple and takes a short time, and it has the effect that a plurality of test bushings can be tested simultaneously. It is something.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing a bushing test device used in a conventional bushing test, FIG. 2 is a schematic configuration diagram showing an embodiment of the bushing test device of the present invention, and FIG. 3 is a plan view of FIG. 2. It is a diagram. 1... Test bushing, 3... Oil tank, 13
...Gas insulating medium, 16...Test bushing,
18... Oil submerged side terminal, 19... Connection conductor, 20...
...Gas tank.

Claims (1)

[Claims] 1. In a bushing test device that connects a test bushing to one test bushing for oil and tests the test bushing, a test bushing mounting part is provided on the top surface of the oil tank, and multiple test bushings are installed around the oil tank. One test bushing for oil is installed in the test bushing mounting part by inserting a part of it into the oil tank, and each test bushing is installed in the test bushing mounting part. A test bushing to which a gas tank containing a gas insulating medium is attached is provided so that a portion thereof is inserted into the oil tank, and the ends of the test bushing and the test bushing inside the oil tank are connected with a connecting conductor. A bushing test device featuring: