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The Research of Two-Terminal Fault Location and Virtual Protection Based on Fault Record Data

Author: LiLei
Tutor: LiFengXia
School: Taiyuan University of Technology
Course: Power Electronics and Power Drives
Keywords: Power system Fault recording data Double-ended ranging Microcomputer Protection MATLAB simulation
CLC: TM855
Type: Master's thesis
Year: 2011
Downloads: 69
Quote: 0
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Abstract


With modern power system voltage level is getting higher and higher energy transport distance is getting longer and longer transmission lines through increasingly complex terrain, especially through the mountains and wilderness, or a region experienced bad weather when the transmission line is easy malfunction. When the transmission line failure ability to accurately determine the fault distance is related to the ability to quickly resection or find fault, but the fault as soon as possible to be able to minimize economic losses and electricity risk. In addition, through the study of virtual protection, evaluation of relay operation is correct, if the protection device malfunction or delay action, in a timely manner, failure of the protection device repair or replacement, the prevention of the recurrence of such action. This paper is based on fault recorder records the recorded wave data to accurately calculate the fault distance and to evaluate the correctness of the protective action. Final java program to write this series of algorithms and criterion, the development of software systems, offline data analysis, and data into a waveform displayed on the screen, more convenient for the user of the electricity system. First proposed the ranging algorithm of the dual-end fault recorder data to calculate the fundamental phase voltage and phase current electrical quantity derived algorithm formula based on the fault before and after the voltage and current of the electrical quantity and the both ends of the introduced synchronization angle. Build models using MATLAB analog fault simulation data, and verification of the accuracy of the distance measurement algorithm. Finally, the Java program to achieve the completion of the ranging algorithm. Other hand, when a fault occurs, the virtual protection can be in the accuracy of the switching action and reclosing after complete evaluation switching operation. In this paper, the design of three main modules, including device the parameters management module, fault recorder data reading and processing module, and logical protection judgment module. Phased-current protection and distance protection for basic line protection model parameter settings, including the setting value and action time setting device parameter module input specific line parameters, fault recording data reading and processing module to calculate the corresponding impedance measurement or measuring current electrical quantities, all the data into logical protection module, derived by comparison of the measured value and the setting value criterion to determine results. The development of the analysis software can achieve these two features, including waveform of the recorded wave data display, analysis, virtual implementation of protective actions, accurate fault location. Data waveform display for easy visual observation, accurate ranging capabilities and the virtual protected discriminant can better help deal with failure. In short, to achieve based virtual fault recorder data protection and fault recorder data analysis software development.

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CLC: > Industrial Technology > Electrotechnical > High Voltage Engineering > High - voltage insulation technology > Insulation test and inspection
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