CAJ | 학술논문

为解决传统相关系数法在对农村配电网故障进行区段定位时，由于采样不同步造成的算法不可靠问题，提出了一种改进的故障区段定位新方法，该方法通过时窗平移法减小采样不同步带来的影响，提高了相关系数法的可靠性。通过对故障暂态零序电流信号求周期和值比，并根据周期和值比与设定阈值的关系，将线路监测点分为两种类型，其中大于阈值的进行相关性分析，从而大大减小了计算量。仿真结果表明，故障区段定位准确性高，稳定性好，定位结果不受故障角、故障距离、过渡电阻和故障类型的影响，且利于实际现场中故障位置的查找。
위해결전통상관계수법재대농촌배전망고장진행구단정위시，유우채양불동보조성적산법불가고문제，제출료일충개진적고장구단정위신방법，해방법통과시창평이법감소채양불동보대래적영향，제고료상관계수법적가고성。통과대고장잠태령서전류신호구주기화치비，병근거주기화치비여설정역치적관계，장선로감측점분위량충류형，기중대우역치적진행상관성분석，종이대대감소료계산량。방진결과표명，고장구단정위준학성고，은정성호，정위결과불수고장각、고장거리、과도전조화고장류형적영향，차리우실제현장중고장위치적사조。
To solve the problem of algorithm unreliability caused by the unsynchronized sampling when locating the rural distribution fault section by using the traditional correlation coefficient ,an improved fault section location method is proposed in this paper .The method which employs the time window shift to reduce the impact caused by the unsynchronized sampling has improved the reliability of correlation coefficients .By calculating the cycle sum ratio of the fault transient zero-sequence current signal ,and dividing the line monitoring points into two types according to the relation of cycle sum ratio and the assumed threshold ,the calculation is greatly simplified after we use the cycle sum ratio of fault section greater than the assumed threshold to conduct a correlation analysis .The simulation results show that the method proposed in this paper has high accuracy and good robustness ,and that the location result is insensitive to the fault phase ,fault distance ,grounding resistance and fault types ,and is conducive to locating the fault point in the practice .