CN203178307U - Grounding box used for transformer test - Google Patents

Abstract

The utility model relates to a grounding box for transformer testing. Its features are: including a box body (1), a wiring panel is installed inside the box body (1), four ordinary wiring posts (3) and four high-voltage wiring posts (2) are fixed on the wiring panel, and All wiring posts are connected by wires. The utility model provides a transformer test grounding box which is easy to operate, convenient to carry, safe and reliable, and is used as a test tool. In the transformer test, according to the test requirements, the non-tested phases are grounded, so that the test personnel do not need to repeat the test. Climbing the transformer, quickly testing the grounding requirements on the ground, effectively shortening the time spent climbing up and down the transformer.

Description

Grounding box for transformer test

technical field

The utility model relates to a grounding box for transformer testing.

Background technique

At present, there are many transformer test items, the test wiring is complicated, and the line is changed frequently. Therefore, the test personnel are required to climb the transformer repeatedly. Taking the 110kV routine test as an example, the test personnel climbed up and down the transformer for 28 times, of which the insulation resistance was 2 times, and the dielectric loss (Dielectric loss) 18 times of tests, 2 times of tap changer, 6 times of DC resistance, the average time spent climbing up and down the transformer was 50 minutes, the average time spent moving above the transformer was 23 minutes, and the average time spent in total was 72 minutes. In addition, due to the laying of many oil pipelines and cable troughs on the transformer, the surface is not smooth, which makes it difficult for personnel to move, and the work at high altitude increases the difficulty of changing lines. Repeated climbing times and frequent line changes not only delayed the test time, but also greatly increased the risk of staff climbing operations.

Utility model content

The purpose of the utility model is to provide a grounding box for transformer testing, which can reduce the number of people climbing the transformer during the testing process of the transformer so as to improve work efficiency.

A grounding box for transformer testing, which is special in that it includes a box body, a wiring panel is installed in the box, four ordinary wiring posts and four high-voltage wiring posts are fixed on the wiring panel, and all wiring posts are connected by wires.

Among them, the wiring panel adopts an epoxy resin board with a thickness of 5mm.

The box body is made of plywood.

Among them, four ordinary wiring piles adopt screw crimping type wiring piles, while four high-voltage wiring piles adopt socket type wiring piles.

Wherein the wire adopts 2.5mm ² copper wire.

The utility model provides a transformer test grounding box which is easy to operate, convenient to carry, safe and reliable, and is used as a test tool. In the transformer test, according to the test requirements, the non-tested phases are grounded, so that the test personnel do not need to repeat the test. Climbing the transformer, quickly testing the grounding requirements on the ground, effectively shortening the time spent climbing up and down the transformer.

Description of drawings

Accompanying drawing 1 is the structural representation of the utility model.

Detailed ways

As shown in Figure 1, the utility model is a grounding box for transformer testing, comprising a cuboid box body 1 with an upper cover, and a wiring panel is fixedly installed in the box body 1 by fasteners, such as bolts, Four ordinary wiring posts 3 and four high-voltage wiring posts 2 are fixed on the wiring panel, and all the wiring posts are connected by wires, specifically welded by 2.5mm ² copper wires.

The wiring panel is made of epoxy resin board with a thickness of 5mm. The wiring panel is 430mm long and 200mm wide. The diameter of ordinary wiring pile 3 is 10mm, and the diameter of high-voltage wiring pile 2 is 15mm.

Among them, the four common wiring posts 3 are screw crimping type wiring posts, while the four high-voltage wiring posts 2 are socket-type wiring posts. The high-voltage wiring posts 2 are mainly used for the signal socket of the dielectric loss measuring instrument.

The using method of the present utility model is:

As shown in Figure 1, the four wiring piles on the left are used as the grounding piles at the end of the bushing, and they are used as the A phase, B phase, C phase, and O phase terminals from left to right, and the four wiring piles on the right are used as the winding grounding piles. From left to right, they are used as high voltage, medium voltage, low voltage, and standby terminals.

When carrying out the dielectric loss test of transformer windings, according to the requirements of the test regulations, the dielectric loss tests of high-voltage windings, medium-voltage windings, low-voltage windings, high-voltage and medium-voltage windings, overall winding dielectric loss and high-voltage bushings must be completed. When the high, medium and low voltage windings are short-circuited to the ground, and the high-voltage winding dielectric loss test is performed, the high-voltage windings are short-circuited to the high-voltage dielectric loss bridge, and the non-tested windings are short-circuited to ground. For example, during the high-voltage bushing test, the primary terminals of A, B, C, and O and the final screen are all led to the ground. When the phase A bushing is tested, the non-tested bushing is short-circuited and grounded at the grounding stake at the end of the bushing in the grounding box, and so on.

Claims (5)

1. A grounding box for transformer testing, characterized in that it includes a box body (1), a wiring panel is installed in the box body (1), and four common wiring piles (3) and Four high-voltage wiring posts (2), and all wiring posts are connected by wires. 2. The grounding box for transformer test according to claim 1, wherein the connection panel adopts an epoxy resin board with a thickness of 5 mm. 3. The grounding box for transformer testing according to claim 1, wherein the box (1) is made of plywood. 4. The grounding box for transformer test according to any one of claims 1 to 3, characterized in that: among them, the four ordinary wiring posts (3) adopt screw crimping type wiring posts, and the four high-voltage wiring posts (2 ) using socket-type wiring piles. 5. The grounding box for transformer test according to any one of claims 1 to 3, wherein the wire adopts 2.5mm ² copper wire.

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