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

MOA Resistive Current Detecting System Based on GPS Synchronization

Author WangYouJia
Tutor JiangXiuChen
School Shanghai Jiaotong University
Course High Voltage and Insulation Technology
Keywords MOA Resistive current GPS timing Fourier series
Type Master's thesis
Year 2010
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Measured regularly run MOA (MOA) resistive leakage current changes , which will help correct diagnosis MOA operating conditions , to detect and eliminate hidden dangers and prevent accidents. This paper analyzes the traditional MOA resistive current detection methods and disadvantages of proposed based on the Global Positioning System (Global Position System: GPS) and wireless communications to achieve MOA charged resistive current detection methods . The method uses GPS and wireless communications to achieve second pulse voltage and leakage current MOA synchronous measurement , without voltage transformer (Potential transformer: PT) frequent secondary side wiring, reduce security risks. Application -based algorithm to calculate the phase difference Fourier series measured voltage and current phase , and through simulation analysis of quantization bits , sampling frequency and length of time of the algorithm accuracy, and the system voltage and frequency measurement error changes were analyzed. The results show that the phase difference Fourier series algorithm can effectively reduce the power system harmonic resistive current fundamental component of the measurement results with high accuracy. Based on the theoretical analysis is given based on GPS MOA resistive current detection system hardware design and completion of the relevant circuit design and software development. Substation electromagnetic environment for a bad situation , detailing the system 's anti-jamming performance test methods and relevant solutions to the problems . 110kV substation devices developed in field operation , the measured data show that the system can effectively detect resistive current MOA in size and has a strong anti-interference performance .

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