CAJ | 학술논문

长距离输电线路对地分布电容引起电流行波畸变，不利于行波初始时刻的准确标定，并且弧垂因素的累积加大了定位误差。为缩短行波双端间距，保证在基频波动环境下可靠定位，提高故障定位精度，提出一种基于Kaiser自卷积窗FFT相位比较式输电线路故障定位方法。该方法设置多个电流测量点，采用FFT程序求解电流故障分量的相位，比较相邻测点的相位差以判别故障区段；利用Kaiser自卷积窗优良可调的旁瓣特性，充分抑制FFT相位求解时的频谱泄漏效应，提高了相位比较的可靠性。理论分析了产生相位频谱泄漏的原因，阐述了Kaiser自卷积窗的旁瓣特性，最后通过仿真验证所提方法的正确性。结果表明方法可有效抑制频谱泄漏，相位比较可靠性高，基频波动下仍能可靠定位。
장거리수전선로대지분포전용인기전류행파기변，불리우행파초시시각적준학표정，병차호수인소적루적가대료정위오차。위축단행파쌍단간거，보증재기빈파동배경하가고정위，제고고장정위정도，제출일충기우Kaiser자권적창FFT상위비교식수전선로고장정위방법。해방법설치다개전류측량점，채용FFT정서구해전류고장분량적상위，비교상린측점적상위차이판별고장구단；이용Kaiser자권적창우량가조적방판특성，충분억제FFT상위구해시적빈보설루효응，제고료상위비교적가고성。이론분석료산생상위빈보설루적원인，천술료Kaiser자권적창적방판특성，최후통과방진험증소제방법적정학성。결과표명방법가유효억제빈보설루，상위비교가고성고，기빈파동하잉능가고정위。
Current traveling waves attenuation caused by ground distributed capacitance of long-distance transmission lines goes against the calibration of initial fault traveling wave arriving times, and arc sag increases location errors. To shorten double ends distance and ensure reliability of fault location under the fundamental frequency fluctuations, and improve its accuracy, this paper proposes a novel fault location scheme for transmission lines based on phase comparison with Kaiser self-convolution windows FFT. This scheme uses FFT program to solve the phase current fault component of multiple current measurements which are compared for determining fault selection; uses excellent sidelobe characteristics of Kaiser self-convolution window to restrain spectral leakage, then the reliability of phase comparison is increased. This paper theoretically analyzes the causes of the phase spectrum leakage, then elaborates the sidelobe characteristics, and finally, verifies the correctness of the proposed method by simulation. The results show that the proposed method can effectively suppress spectral leakage with a high reliability.