Low-voltage short circuit impedance test aid instrument

Abstract

The invention relates to a low-voltage short circuit impedance test aid instrument, which comprises a connection line, and is characterized by further comprising an aid instrument box body and a relay, wherein a wiring selection switch and twenty-five wiring terminal jacks are arranged on the aid instrument box body; the wiring selection switch is a selection switch and is connected with a transmitter; the wiring selection switch is electrically connected with the twenty-five wiring terminal jacks; the wiring terminal jacks are connected with wiring terminals of a transformer low-voltage short circuit impedance tester through the connection line; the relay is electrically connected with the transformer; and the relay is also connected with a receiver. The low-voltage short circuit impedance test aid instrument has the advantages that the structure is simple; the use is convenient; and the working efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of transformer testing instruments, in particular to a low-voltage short-circuit impedance testing auxiliary instrument. Background technique [0002] The transformer is the most important electrical equipment in the substation, and the low-voltage short-circuit impedance is an important test item in the transformer preventive test. Power transformers will inevitably suffer physical shocks and various adverse working conditions during operation or transportation, which will cause deformation of transformer windings. The variation of low-voltage short-circuit impedance is an important method to judge whether the transformer winding is deformed or not. Transformers are generally tested using the current-voltage method. Impedance voltage (%) definition: when the secondary side is short-circuited and the primary side (or secondary side) current reaches the rated current value, the ratio of the primary side vol...

AI Technical Summary

Problems solved by technology

In the process of short-circuit impedance test, the workload is heavy and there are many dangerous points

At the same time, the wiring method is complicated during the test process, and the wiring method needs to be replaced frequently. During the test process, 220V voltage needs to be applied, which may easily cause safety accidents due to negligence.

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