Large generator based local discharge ultrasonic distribution characteristic sensor setting analysis method

Abstract

The invention discloses a large generator based local discharge ultrasonic distribution characteristic sensor setting analysis method, which comprises the following steps of: constructing a large generator model; performing simulative calculation on sound field distribution of a single bar of a generator winding in air and sound field distribution of the single bar in oil; constructing a model of a generator stator and performing simulative calculation on sound field distribution of local discharge of a stator winding in the entire generator stator; performing simulative analysis on propagation of an ultrasonic direct incidence signal in the stator model by using a transient state model; solving out angle range of direct incidence ultrasound and calculating sound pressure distribution condition on the outer wall of the stator; and obtaining a sensor distribution rule for effectively acquiring the direct incidence ultrasonic signal. The method breaks through the conventional large-container monitoring method for the large generator local discharge; and by using the method, the ultrasonic distribution characteristic of the local discharge in the generator is conveniently and effectively displayed; effective reference is provided for rational arrangement of an ultrasonic sensor; and meanwhile, an idea is provided for the positioning a local discharge point.

Description

technical field [0001] The invention particularly relates to a sensor setting analysis method based on the partial discharge ultrasonic distribution characteristics of a large generator. Background technique [0002] At present, the electric power industry is developing rapidly, the scale of the power grid is expanding day by day, and the voltage level is gradually increasing. These factors have correspondingly put forward higher requirements for the stability and reliability of the power system and the operating conditions of various electrical equipment. [0003] With the development of industry and technological progress, the generator, which is the key electrical equipment in the power system, is also developing in the direction of large capacity and high voltage. The safe and reliable operation of the generator has become the top priority of the power system. According to incomplete statistics, during the period from 1983 to 1995, more than 20 short-circuit accidents o...

AI Technical Summary

Problems solved by technology

These monitoring methods have their own advantages and disadvantages, some require experienced operators to identify the discharge signal, and some signals are interfered, but all of them can provide a certain reference value for the partial discharge monitoring of large motors

None of these monitoring systems can locate the partial discharge point for easy maintenance and repair

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