Relay protection device online evaluation method

Abstract

The invention discloses a relay protection device online evaluation method. The relay protection device online evaluation method includes the steps that firstly, according to the time series ETj, the slope of a straight line is fitted through calculation, normalization is carried out to enable the slope to be a numerical value ranging from -1 to 1, and the numerical value is expressed with Ei to serve as an expression of index characteristic values; after weighted averaging is carried out on the multiple index characteristic values according to a certain weight, a dimensionless parameter ranging from 0 to 1 is formed and expressed with Ed, a threshold value of the health degree is set to serve as an alarm condition, and when the health degree is smaller than the threshold value, an alarm is given to warn a maintaining worker that relay protection equipment needs to be maintained. By means of the relay protection device online evaluation method, the function performance characteristic parameters for reflecting the relay protection equipment health state are extracted on line, and relay protection equipment online monitoring is achieved.

Description

[0001] The patent application of the present invention is a divisional application of the invention title "A Method for Using Communication Process Analysis to Realize Online Monitoring of Relay Protection Equipment". The original application date is January 8, 2014, and the application number is 2014100091829. technical field [0002] The invention relates to the on-line monitoring technology of relay protection equipment. Background technique [0003] Condition-based maintenance is an important development direction of the current electrical equipment maintenance work mode reform. One of the key elements to realize condition-based maintenance is to realize the online monitoring and condition evaluation of electrical equipment status. In the power system, the online status monitoring technology and method of primary equipment (such as transformers, circuit breakers, capacitors, etc.) The intelligent equipment (IED) condition monitoring technology represented by integrated m...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide an online evaluation method for relay protection devices, which reduces the work intensity of manual analysis of communication messages and evaluation of intelligent equipment performance defects, shortens the working time and improves the accuracy of evaluation and judgment of device failures, effectively Eliminate the potential safety hazards of intelligent equipment such as relay protection, reduce the risk of power outages caused by secondary equipment defects, and help improve the reliability of the power supply system

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