Intelligent substation relay protection device fault diagnosis system and method

Abstract

The invention provides an intelligent substation relay protection device fault diagnosis system and method, and relates to the field of electrical equipment and electrical engineering. The method comprises the steps that a data obtaining module obtains the state quantity data of a relay protection device; a database obtains state quantity data; a data processing module is used for filtering and deleting redundant data and invalid data in the acquired data; a state evaluation module analyzes and evaluates the state quantity data and finally obtains the health state grade of the device; a faultprediction module judges the state trend and the residual life of the device and performs fault prediction; and a starting element hidden fault analysis module is used for carrying out wavelet transform analysis on the obtained fault recording data to obtain a real fault node so as to judge the execution performance of the starting element, judge whether a hidden fault exists or not and judge whether a starting threshold needs to be modified or not. The problems of improper maintenance, excessive maintenance and the like of a relay protection device can be effectively avoided, the safety condition of the device is improved, and the service life of the device is prolonged.

Description

technical field [0001] The invention relates to the fields of electrical equipment and electrical engineering, in particular to a fault diagnosis system and method for a relay protection device of an intelligent substation. Background technique [0002] The research on condition-based maintenance of relay protection equipment in our country is still in the exploratory and experimental stage, and several different theories based on life-cycle cost, reliability and risk assessment have been proposed for condition-based maintenance. Although the relay protection realizes the microcomputer protection, there are still two problems that are difficult to solve: [0003] 1) The traditional maintenance of relay protection devices adopts the regular inspection mode, which has great compulsion and blindness, resulting in "over-inspection" and "under-inspection". Excessive maintenance will increase the workload of maintenance management personnel, resulting in waste of equipment resour...

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Problems solved by technology

[0004] 2) At present, most of the monitoring of whether there is a fault in the relay protection system in operation is guaranteed by some simple self-test functions in the microcomputer protection

Regardless of the regular planned maintenance of the protection system or the self-inspection function of the protection device, it is difficult to accurately predict the fault of the relay protection

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