The Development Of Protection Relay Performance Analysis System Based On Fault Recorder Data

When the system failure or abnormality vibration occurs, fault recorderautomatically record action information of the voltage and current and relay protectionin the process of before and after failure, which provide rich source of data formalfunction analysis and protective relays testing. This paper studies digital simulationmethod of data processing, failure analysis and relay protection device, developes anprotective relays analysis system.This paper studies fault data processing method, and electrical signal parameterestimation algorithm based on the recorded data, introduces recorded data formatconversion method, the fault data commonly used processing technology. Consideringthat fault signal contains aperiodic decaying DC component and high-frequencytransient component, two algorithm are proposed to estimate short-circuit currentbased on the method of least squares and Prony algorithm, the specific algorithmderivation process and the calculating step is detailed. In view of the requirements andcharacteristics of the fault recorder signal analysis, improvement measures is proposedto improve the accuracy of parameter estimation. The simulation results demonstratethe feasibility and effectiveness of the proposed method.The paper focuses on the relay characteristics analysis method. Based on theanalysis of power system line protection, transformer protection and busbar protectionmicrocomputer principles and action criteria, this paper designs the transmission linerelay dynamic simulation program and analyzes procedures including three-currentprotection, distance protection, pilot protection, transformer primary protection,backup protection, inrush current lockout and bus differential protection, CT saturationrecognition, etc.This paper designs and develops analysis system based on the characteristics ofthe fault data on protective actions in Visual Basic6.0platform. Through recorded dataformat conversion and document management module, the system realizes faultrecorder file read and management, fault data format conversion; through the faultwaveform reproduction and analysis module, realizes power failure waveformreproduction, zoom, print, and other waveform processing, to provide users with aflexible and convenient fault waveform observation and analysis interface; through thegrid failure secondary analysis module, completes any time electrical parameters, vector analysis, sequence component analysis and harmonic analysis, and realizes faulttype, fault line recognize, and fault location; provides aids for gird failure. Throughprotective actions behavioral analysis module, completes the substation protectiondevice configuration, achieves the function of transmission lines, transformers,busbars main substation equipment protection devices operating characteristicsanalysis.The analysis system based on the characteristics of the fault data on protectiveactions uses the fault data to the the disturbance recorder apparatus recorded as theoriginal input, for different working principle of the protective device, by the computerdevelopment corresponding program to simulate the different operation of theprotection device, and visually to obtain analysis results. The software is able tocompensate for an insufficiency of fault recording and analysis software in analysis ofjudging the behavior of the protective actions, as an analysis utility to the incorrectaction of reasons as failure analysis and relay protection, so as to further improve thecorrect action rated and operation level of protection devices to ensure safe and stableoperation of power systems.