Transformer resistance tester capable of being quickly switched

Abstract

The invention discloses a transformer resistance tester capable of being quickly switched. The transformer resistance tester comprises a test box, a test module arranged in the test box, wherein the test module is provided with two signal ends; the test box is connected with at least three test leads; the test module is connected with a switching circuit; the switching circuit comprises a switching device; a plurality of output ends and a plurality of input ends are arranged at two ends of the switching device respectively; the plurality of output ends are connected with the test lead separately; the plurality of input ends are connected with the signal ends separately. A manual wire change step in a traditional test technology is replaced with fast switching of the test lead by using the switching circuit; the condition that test personnel misjudge the winding performance of a transformer according to the test result due to the fact that the kneading position and force and the contact surface of a wire clamp are different due to human factors when the wire clamp is exchanged each time is avoided. The transformer resistance tester has the advantages that the test time is shortened and the test accuracy is improved to improve the work efficiency.

Description

technical field [0001] The invention relates to the field of electric appliance testing devices, in particular to a rapidly switchable transformer resistance tester. Background technique [0002] Transformer DC resistance test is a necessary item for transformer semi-finished product test, finished product factory test, installation, handover test and preventive test of power department. It can effectively detect and timely discover manufacturing defects of transformer coils (such as improper material selection, welding, loose connection parts, lack of stock, disconnection, etc.) and potential safety hazards after operation. Regardless of whether it is a new factory or a transformer in operation, the DC resistance test must be carried out according to the requirements of the regulations. Because of the different wiring groups of the transformer, the test wiring methods are also different. The boundary section of the transformer includes a high-voltage end and a low-voltage ...

AI Technical Summary

Problems solved by technology

The boundary section of the transformer includes a high-voltage end and a low-voltage end. The high-voltage end has 3 ports, which are A-side, B-side, and C-side. The low-voltage side has 4 ports, which are a-side, b-side, c-side, and 0-side. It also includes the neutral terminal N terminal. The traditional test method is phase-by-phase measurement. The three-phase transformer needs to be measured three times, so the on-site test takes a long time and the operation is very cumbersome.

The existing DC resistance tester only has two lead wires, and only one group of coils can be tested in each test, and the test of other coils can only be completed by manually replacing the clamps. Since the transformer lead wires are very high from the ground, In the process of changing the clamp, the tester needs to go back and forth to the transformer continuously, which artificially prolongs the DC resistance test time

And every time the clamp is replaced, the pinching position, strength and contact surface of the clamp will be different due to human factors, and the test results will inevitably be different, which may cause the test personnel to misjudge the winding performance of the transformer based on the test results

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