CAJ | 학술논문

针对零序电流互感器极性不明确导致选线失败的问题，分析了选线失败的原因，提出一种基于对地电容近似熵的选线方法。提出利用差分方法改进矩阵束，解决分量湮没问题，从而准确提取复频域极点信息。分别求取每条线路对地电容序列，由于消弧线圈补偿作用故障线路电容序列近似熵将超过阈值，则判断该条线路为故障线路。仿真实验结果验证：该方法摆脱了由于零序互感器极性不同而导致选线错误的限制，且适用于两出线系统，适应性强，选线准确率高。
침대령서전류호감기겁성불명학도치선선실패적문제，분석료선선실패적원인，제출일충기우대지전용근사적적선선방법。제출이용차분방법개진구진속，해결분량인몰문제，종이준학제취복빈역겁점신식。분별구취매조선로대지전용서렬，유우소호선권보상작용고장선로전용서렬근사적장초과역치，칙판단해조선로위고장선로。방진실험결과험증：해방법파탈료유우령서호감기겁성불동이도치선선착오적한제，차괄용우량출선계통，괄응성강，선선준학솔고。
Anti-polarity of zero sequence CT leads to the failure in NES fault line selection, after analyzing the reason, a new selection approach using approximate entropy of ground admittance is proposed. Difference method is used to improve matrix pencil and solve the problem of component annihilation, therefore the pole information of complex frequency domain is got accurately. Evaluating the approximate entropy of distribution capacitance of each feeder under arc suppression coil compensation effect, then it is discriminated as fault feeder when the numerical value is beyond a threshold value. The method eliminates the error due to the limitation of anti-polarity of zero sequence CT and can also be applied to system with two feeders. Experimental results show that it can increase the accuracy and dependability of fault line detection effectively.