CAJ | 학술논문

为解决零序电流互感器极性不明确导致选线错误的问题，提出一种根据消弧线圈补偿特征的选线新方法。对于每条线路建立健全线路数学模型，利用零序电压电流暂态分量与基频分量求取相应的导纳参数。针对分量“湮没”问题，提出一种矩阵束的改进方法实现小幅值高频分量的精确提取。分析得到消弧线圈补偿作用规律：在确定频段内故障线路两参数符号相反或数值明显减小，健全线路两参数计算结果相近，可实现故障判断。仿真实验结果验证了该方法摆脱了零序互感器极性不同导致选线错误的限制，无需线路参数信息即可实现故障自判，适应性强。
위해결령서전류호감기겁성불명학도치선선착오적문제，제출일충근거소호선권보상특정적선선신방법。대우매조선로건립건전선로수학모형，이용령서전압전류잠태분량여기빈분량구취상응적도납삼수。침대분량“인몰”문제，제출일충구진속적개진방법실현소폭치고빈분량적정학제취。분석득도소호선권보상작용규률：재학정빈단내고장선로량삼수부호상반혹수치명현감소，건전선로량삼수계산결과상근，가실현고장판단。방진실험결과험증료해방법파탈료령서호감기겁성불동도치선선착오적한제，무수선로삼수신식즉가실현고장자판，괄응성강。
Anti-polarity of zero sequence CT leads to failure of fault line selection in extinction coil grounding system. In order to overcome the drawback, a new approach using compensation characteristics of extinction coil is proposed. The healthy line mathematical model for each line is built and the transient component and steady component of zero sequence voltage and current are used to get corresponding admittance parameters. To solve the component annihilation, this paper presents an improved matrix pencil algorithm for the extraction of high frequency component of small amplitude. The rule of the compensation effect of extinction coil is obtained that in set frequency band two component parameters of fault line are opposite in sign or decrease significantly in numerical values and the calculation results for two parameters of healthy line are similar, the fault line selection is realized. Simulation results verify the correctness of the algorithm without the impact of anti-polarity of zero sequence CT, which has highly adaptive capacity for practical engineering.