Test clamp of 10kV switch cabinet current transformer

Abstract

The invention relates to a test fixture for a current transformer of a 10kV switch cabinet, which includes a crank arm, a double-arm clamp is fixed at the front end of the crank arm, a contact is arranged on the head of the clamp, the contact is connected to a test cable, and the rear end of the crank arm is installed. Screw handle. A 10kV switch cabinet current transformer test fixture of the present invention adopts an inverted U-shaped structure, and the inverted U-shaped crank arm is integrally formed of Bakelite with good insulation and easy processing, and has both certain mechanical strength and insulation properties. The front end of the crank arm is a rotatable double-arm clamp that can simultaneously clamp the two primary terminals of the current transformer, reducing the number of test connections. The wire clip is a copper multi-row contact, one end is fixed on the movable shaft, and the other end is supported by a spring, which not only increases the contact area with the primary wiring board of the current transformer, makes it in good contact, but also ensures the passage of large current, and It can increase the fastness of the wire clip, and can be fixed reliably to prevent falling off.

Description

technical field [0001] The invention relates to the design of a test fixture for a current transformer of a 10kV switch cabinet. Background technique [0002] With the widespread application of 10kV switchgear in the national grid power system and large-scale enterprise substations, the test tasks of 10kV current transformers are increasing day by day, and the traditional test methods have problems such as difficult operation and low efficiency. So how to improve the test efficiency and test safety of 10kV current transformer is an urgent problem to be solved. The steps of the traditional test are as follows: 1. The tester puts his hands into the cabinet body to find out the position of the primary side screw; 2. Puts the wire clamp into the cabinet body for blind clamping according to the proven position; 3. Wait for the wire clamp to clamp the pile After tightening the screw, shake the clamp to check whether it is clamped. If the clamp fails, repeat the above operation. ...

AI Technical Summary

Problems solved by technology

The internal space of the cabinet is narrow, only the arm can be extended in, and the screw is in the blind area of ​​vision, which makes it difficult to clamp the wire, and the wire clip is easy to fall off, posing a safety hazard

In addition, due to the short exposure of the pile head screw and the small contact surface, the large contact resistance and the difficulty in raising the current

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