A method for fault detection of turn-to-turn short-circuits of circuit breaker opening and closing coils

Abstract

The invention discloses a circuit breaker switching on / off coil turn-to-turn short-circuiting fault detection method and belongs to the electric power equipment detection technical field and electric power equipment application technical field. The method includes the following steps of: 1, tested coil design: two taps of the outgoing line of a tested coil are adjusted so that the length of the two taps can be inconsistent; 2, fault detection and signal acquisition: a double-ended pulse method is adopted to detect the tested coil, so that waveform signals can be obtained; and 3, fault analysis: noise reduction is carried out on the waveform signals obtained at the two taps respectively in the step 2, and subtraction is carried out on the waveform signals which are obtained from the two taps respectively and have been subjected to noise reduction, so that fault characteristic waveforms can be obtained, and the fault characteristic waveforms are analyzed through the following manners: when the subtracted fault characteristic waveforms are a straight line, a turn-to-turn short-circuiting fault does not occur, and when the subtracted fault characteristic waveforms have non-zero protruding regions, a turn-to-turn short-circuiting fault occurs. The circuit breaker switching on / off coil turn-to-turn short-circuiting fault detection method of the invention has the advantages of high sensitivity, portable equipment, simple analysis and operation, intuitive judgment and high reliability, and is more suitable for on-site application.

Description

technical field [0001] The invention belongs to the field of electric equipment detection technology and its application, and in particular relates to a method for detecting short-circuit faults between turns of opening and closing coils of a circuit breaker. Background technique [0002] The circuit breaker is the safety guard of the power system. It not only has the functions of closing, carrying and breaking the current under normal circuit conditions, but also performs operations such as converting the operating mode of the system and cutting off the fault current. The reliability of the circuit breaker has extremely important practical significance to the safe operation of the whole system. [0003] The opening and closing action of the circuit breaker is usually completed after the action command is issued, the opening and closing coil is energized to move the iron core, and the opening and closing detent is triggered to trip. Due to poor processing technology, poor w...

AI Technical Summary

Problems solved by technology

Since there is no direct test of the coil, this method can only roughly judge whether the opening and closing coil can work normally, and cannot accurately judge the degree of deterioration of the inter-turn insulation

In addition, whether it is a direct method or an indirect method, live detection cannot be realized at present, and it needs to be tested after the circuit breaker is powered off and out of operation, and the sensitivity is limited

[0005] To sum up, the existing detection methods for inter-turn short-circuit faults of opening and closing coils have certain limitations and deficiencies. The actual site needs a more sensitive, reliable and convenient method to solve the above problems

Images