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

A technology for excitation winding and short-circuit faults, which is applied in short-circuit testing, measuring devices, and electrical winding testing, etc., can solve problems such as increased process difficulty and cost, insufficient real-time performance and reliability, and achieve effective extraction, effective online monitoring and protection Effect

Pending Publication Date: 2020-12-29
FUJIAN NINGDE NUCLEAR POWER +10
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Problems solved by technology

These monitoring methods all need to modify the structure of the motor, which is insuffic

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

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Embodiment Construction

[0057] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0058] The present invention proposes a method for detecting short-circuit faults of excitation windings of a multi-phase angular brushless excitation system based on the characteristics of excitation current harmonics. The technical principle of the technical solution is firstly described below:

[0059] The multi-phase brushless exciter is essentially a salient pole synchronous motor, and the excitation winding is a centralized structure. Under normal operati...

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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...

Claims

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Application Information

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IPC IPC(8): G01R31/72G01R31/52G01R31/34G01R19/00
CPCG01R31/72G01R31/52G01R31/346G01R19/0092
Inventor 王晓明胡亮宗卫晶刘鹏吴喜松李文武任仰凯屈天龙韦玉榜段贤稳郭立雄魏利峰房志强徐文兵钟浩文郝亮亮桂林王祥珩
Owner FUJIAN NINGDE NUCLEAR POWER
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