Multi-sensor Combined Diagnosis Method for Turbine Generator Rotor Turn-to-Turn Short Circuit

Abstract

The invention discloses a turbo generator rotor interturn short circuit fault diagnosis method based on multi sensor joint. According to the method, a variety of fault characteristic parameters acquired by different types of sensors arranged at a number of parts of a generator and respective thresholds are used to carry out calculation, so as to acquire fault characteristic values when diagnosis is carried out according to each fault characteristic parameter; according to the reliability of different diagnostic methods, weight assigning is carried out on each fault characteristic value; the weighted sum of a variety of fault characteristic values is acquired; and finally by comparing the weighted sum with a comprehensive threshold, whether the turbo generator has a rotor winding interturn short circuit fault is identified. According to the invention, comprehensive analysis is carried out on the diagnosis information acquired by different types of sensors to judge whether the turbo generator has the rotor winding interturn short circuit fault; the method overcomes the shortcomings of the traditional single diagnosis method; and the sensitivity and the reliability of the rotor winding interturn short circuit fault detection of the turbo generator are improved.

Description

technical field [0001] The invention relates to a method capable of timely and accurately diagnosing the inter-turn short-circuit fault of the rotor winding of a turbogenerator, belonging to the technical field of generators. Background technique [0002] Turn-to-turn short-circuit fault of rotor winding is one of the common electrical faults of turbogenerator. If the fault is not dealt with in time, it may lead to serious faults such as grounding of one or two points of the rotor and magnetization of the large shaft. Therefore, it is very necessary to carry out early prediction of short-circuit faults between turns of rotor windings of turbogenerators. There are various diagnosis methods for inter-turn short circuit faults of turbogenerator rotor windings, which can be generally divided into two categories, namely offline diagnosis methods and online diagnosis methods. Among them, the online diagnosis method can detect the fault in real time and prevent it from further det...

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Problems solved by technology

[0004] In a word, although the on-line detection of inter-turn short-circuit faults of rotor windings has been paid much attention at home and abroad, the existing methods are still subject to certain restrictions in application, and the results obtained in actual tests are not very ideal. It is not uncommon to find serious consequences after short-circuit faults are not detected in time, so it is necessary to further improve the diagnosis level of such faults

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