CAJ | 학술논문

提出了高压滤波电容器组不平衡电流保护的整定原则，从两方面通过数学逻辑分析了H型和∏型接线高压电容器组及其不平衡电流保护的优缺点：其一是部分电容器单元失效后滤波器所允许的失谐度，其二是余下完好电容器单元所承受的端电压。文中给出了不同电容器单元短路方式下的不平衡保护定值计算公式和整定值，得出了∏型接线优于H型接线的结论。为改进∏型接线电容器组的差电流检测精度，给出了差值电流检测电路的改进方案。
제출료고압려파전용기조불평형전류보호적정정원칙，종량방면통과수학라집분석료H형화∏형접선고압전용기조급기불평형전류보호적우결점：기일시부분전용기단원실효후려파기소윤허적실해도，기이시여하완호전용기단원소승수적단전압。문중급출료불동전용기단원단로방식하적불평형보호정치계산공식화정정치，득출료∏형접선우우H형접선적결론。위개진∏형접선전용기조적차전류검측정도，급출료차치전류검측전로적개진방안。
The paper proposed principles for calculating the settings of unbalanced current protection of high voltage filter capacitor banks, and analyzed the merits and demerits of“H-type” and “∏-type” connections of capacitor banks from perspective of mathematic logic in two ways. Of which one involved the permitted detuning of the filters after failure of some units, the other involved the withstand voltages on remaining perfect capacitor units. The formulations were deducted to calculate the settings of unbalanced current protection in cases when short circuit of some capacitor units occurred. It is concluded that ∏-type connection is better than the H-type connection. To improve the accuracy for detecting differential currents of ∏-type connection, a new unbalanced current transformer and its application are suggested.