CAJ | 학술논문

分析了在实际工程中几种的发电机转子接地保护及其存在的问题,通过计算第两点接地的阻值和位置,从理论上分析出一点接地阻值的测量准确性对于第二点接地阻值有重要的影响.根据几年来现场机组保护调试和投运的工程经验提出了一种新的组合式的转子接地计算方案,即将乒乓式和注入式原理相结合,对于转子接地阻值及位置三次独立的测量并综合计算.通过理论分析和以三峡ALSTOM机组为模型的Matlab仿真数据结果表明,和常规单一测量方式的转子接地保护相比较,组合式原理的保护能提高发电机一点接地的可靠性和准确性,同时也能起到监视采样回路的功能.
분석료재실제공정중궤충적발전궤전자접지보호급기존재적문제,통과계산제량점접지적조치화위치,종이론상분석출일점접지조치적측량준학성대우제이점접지조치유중요적영향.근거궤년래현장궤조보호조시화투운적공정경험제출료일충신적조합식적전자접지계산방안,즉장핑퐁식화주입식원리상결합,대우전자접지조치급위치삼차독립적측량병종합계산.통과이론분석화이삼협ALSTOM궤조위모형적Matlab방진수거결과표명,화상규단일측량방식적전자접지보호상비교,조합식원리적보호능제고발전궤일점접지적가고성화준학성,동시야능기도감시채양회로적공능.
This paper analyzes several generator rotor grounding protecting methods and the existed problems. Theoretic analysis shows that the measurement accuracy of the first grounding resistance is very important for the calculation of the second point grounding resistance. In this paper, a new combined principle for generator rotor grounding is presented from the practical debugging and operating experience of generator-transformer protection. The new principle measures and calculates three times for the rotor grounding resistance and position combining the ping-pong method and the injected square-wave method. Theoretical analysis and the MATLAB simulation results based on the ALSTOM unit model of Three Gorges prove that the reliability and accuracy of the rotor one-point grounding protection is improved compared with conventional single measurement methods. The sampling circuit can also be monitored at the meantime.