Method and device for detecting short-circuit fault of exciting winding of multi-phase angular brushless excitation system

Abstract

The invention relates to a method and a device for detecting a short-circuit fault of an exciting winding of a multi-phase angular brushless excitation system. The method for detecting the short-circuit fault of the exciting winding comprises the following steps: sampling exciting current in a stator exciting winding; performing Fourier analysis on the sampled current, and extracting m / P multipleharmonic current and even harmonic current in the sampled current; and determining whether the exciting winding has the short-circuit fault or not according to the m / P multiple harmonic current and the even harmonic current. By implementing the technical scheme, the turn-to-turn short-circuit fault characteristics of the exciting winding can be effectively extracted under the condition that a motor is not required to be transformed, so that the turn-to-turn short-circuit fault of the exciting winding of a multi-phase angular brushless exciter can be effectively monitored and protected on line.

Description

technical field [0001] The invention relates to the field of relay protection for main equipment of a power system, in particular to a method and a device for detecting a short-circuit fault of an excitation winding of a multi-phase angular brushless excitation system. Background technique [0002] The excitation system is an important part of a large generator. An excitation system with excellent performance and high reliability is the basis for ensuring the safety of the generator and the stable operation of the power system. The brushless excitation method cancels the carbon brush and slip ring of the generator, reduces the maintenance workload of the excitation system, and significantly improves the reliability of the excitation system. It is the preferred excitation method for large-scale nuclear power generators. And the rotating rectification link, the excitation system failure often occurs in practice. Slight faults will not have a serious impact on the excitation s...

AI Technical Summary

Problems solved by technology

These monitoring methods all need to modify the structure of the motor, which is insufficient in real-time and reliability, which increases the difficulty and cost of the process

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