Method For Determining Arc Discharge As Well As Failure Of Mechanical Vibration And Abnormal Displacement In Power Equipment Using Acoustic Energy Feature

Abstract

The present invention provides a method for determining arc discharge as well as failure of mechanical vibration and abnormal displacement in power equipment using acoustic energy feature. Here, acoustic energy feature is firstly introduced to realize real-time, online inspection of failure in power equipment, enabling qualitative determination of discharge as well as mechanical vibration and abnormal displacement, so as to improve early warning before damage. Two factors, in which one is early detection of discharge, and the other is early detection of mechanical vibration and abnormal displacement, are considered. When abnormality of any one of these factors is emerged, it is demonstrated that hidden trouble is presented. Here, acoustic energy feature is used to perform real-time, online monitoring. Due to reliable diagnosis and strong interference resistance provided by sound source signals, the operating condition in which the equipment is situated may be reflected clearly, avoiding damage to electric power grid.

Description

technical field [0001] The invention relates to a method for judging arc discharge, mechanical vibration, and abnormal displacement faults of power equipment, and relates to the field of online real-time monitoring of power equipment, in particular to a method for judging high-voltage power equipment by using sound energy characteristics (20Hz-20KHz) and vibration frequency Methods for internal discharge, abnormal mechanical displacement, and vibration faults. Background technique [0002] Both sound waves and shock waves are mature technologies, and the combination of the two has broad development prospects in the power industry. [0003] The detection methods of power equipment include offline method and online detection method. The off-line detection method requires a power outage. After the power outage, the state of the equipment does not match the operation, which affects the accuracy of judgment and cannot judge the working condition, especially the mechanical perfor...

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Problems solved by technology

[0004] At present, there are many equipment power failure test methods in the International Electricity Standard (IEC), which usually need to be carried out under power failure conditions, which cannot reflect the arc discharge and abnormal vibration state that may occur under working conditions. The disadvantage is that it still cannot prevent accidents.

At present, there are many online test methods for power equipment at home and abroad, and the common methods are; ultrasonic partial discharge method (the effect in practice is not obvious and the online detection is still under discussion), insulating oil chromatography online method (limited to chemical analysis and insulating oil status) ), SF6 gas micro-water measurement method (limited to the insulation level of SF6 gas, which can be carried out without power failure, but not online detection), infrared temperature measurement method (limited to abnormal temperature, cannot detect internal defects of equipment), online interface of capacitive power transformation equipment Loss method (the "distortion" problem of the sampling signal of the mutual inductance sensor has not yet been solved), etc., these methods are limited, one-sided, uncertain, and cannot fully meet the required function expansion

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