CAJ | 학술논문

基于实际工程介绍了一种超高压磁控式并联电抗器的励磁系统构成，分析了控制绕组匝间短路的故障特征。结合MATLAB数字仿真和动模实验结果，提出了以过电压保护作为控制绕组匝间保护方案存在延时动作且可能拒动的潜在问题，分析其原因在于故障时直流母线极间电压中的故障特征只含有间断的电压尖峰而非连续的交流过电压，且在某些情况下完全不显示故障特征。建立了故障后励磁系统的电流分布模型，得出故障后直流母线极间电压中故障特征的出现依赖于总控制电流过零的结论。提出以总控制电流中的基波分量作为判据的控制绕组匝间保护新方案，该方案在小匝间故障时仍具有很高的灵敏度，结合仿真结果论证了新方案的有效性。
기우실제공정개소료일충초고압자공식병련전항기적려자계통구성，분석료공제요조잡간단로적고장특정。결합MATLAB수자방진화동모실험결과，제출료이과전압보호작위공제요조잡간보호방안존재연시동작차가능거동적잠재문제，분석기원인재우고장시직류모선겁간전압중적고장특정지함유간단적전압첨봉이비련속적교류과전압，차재모사정황하완전불현시고장특정。건립료고장후려자계통적전류분포모형，득출고장후직류모선겁간전압중고장특정적출현의뢰우총공제전류과령적결론。제출이총공제전류중적기파분량작위판거적공제요조잡간보호신방안，해방안재소잡간고장시잉구유흔고적령민도，결합방진결과론증료신방안적유효성。
Based on the engineering application,the excitation system of an extra-high voltage (EHV) magnetic controllable shunt reactor (MCSR) is described and the characteristics of control winding turn-to-turn fault of a MCSR is analyzed. According to numerical simulations and experimental tests,a problem in the application of overvoltage protection against control winding turn-to-turn fault is discovered,that is,such a protection operation is delayed or even a malfunction.This is because the fault features DC buses during a turn-to-turn fault intermittent voltage spikes rather than standard sinusoidal overvoltage and the fault feature may even not exist in some fault cases.The current distribution model for the excitation system during a turn-to-turn fault is built and it is concluded that the appearance of fault features on DC buses depends on the zero-crossing of the total control current.A new protective scheme that uses the fundamental component in the total control current as criterion is proposed and simulation results have verified the effectiveness of the new scheme.