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Study and Realizing of Method of AC Locating Fault in Distribution System

Author: WangZhaoYang
Tutor: QiYuLin
School: North China Electric Power University (Hebei)
Course: Communication and Information System
Keywords: AC fault location Low-frequency AC injection method PWM signal C8051F310 microcontroller
CLC: TM862
Type: Master's thesis
Year: 2010
Downloads: 87
Quote: 0
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Abstract


Blackout offline distribution network the AC fault location method ideas: line single-phase ground fault to fault injection AC signal, then carry handheld the AC signal detector detection dichotomy along the road until you find fault. AC injection signal frequency article select 60Hz, relative to the S signal injection method, called low-frequency AC injection method. Through this research work, made the following main research results and conclusions: (1) for the first time to exchange positioning method from experience to theory. (2) AC source and the AC signal detector design. (3) detector using microcontroller C8051F310, which is more advanced microcontroller. (4) The data show that part of the LCD display and microcontroller interface for serial communication interface module to conserve battery power consumption. The method can be ground to detect, easy on-site personnel to operate, and Baoding the Dingzhou Zhao Zhangjiawa substation line experiments prove its effectiveness. The idea of ??AC locating fault method in distribution system is that injecting an AC signal into the fault phase after a single line to ground fault happened, and then diagnosing the fault along the transmission line with the handled AC signal detector utilizing dichotomy method until the fault is determined. The frequency of the injected AC signal used in this study is 60 Hz. Compared with the injected S signal technique, this method is called low frequency AC signal injection method. The study of this paper made the following key findings and conclusions: 1. Exchange the AC positioning methods from experience to theory by the first time.2. The low-frequency AC positioning method is firstly proposed and is implemented.3. The detector use microcontroller C8051F310, which is the more advanced microcontroller.4. Data show uses LCD module in order to save battery power and the interface of display and microcontroller is serial communication interface.The proposed technique allows the ground detecting and is convenient for engineers'operation., the locating fault efficiency is improved and the validity of this method is proved by experiment.

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CLC: > Industrial Technology > Electrotechnical > High Voltage Engineering > Overvoltage and Its Protection > Over-voltage protection devices
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