公开(公告)号：WO0184687A3

公开(公告)日：2002-02-21

申请号：PCT/US0114013

申请日：2001-04-30

Applicant: SCHWEITZER ENGINEERING LAB INC

Inventor： ROBERTS JEFFERY B ,  HOU DAQING ,  ALTUVE-FERRER HECTOR

IPC: H02H3/08 ,  H02H3/40 ,  H02H9/08

CPC classification number: H02H3/081 ,  H02H3/402 ,  H02H9/08

Abstract: A system for detecting ground faults in a compensated electric power distribution network includes the determination of zero sequence voltage (V0) and zero sequence current (I0) on a power line and calculating the zero sequence conductance (G0) therefrom. The oepration of the conductance calculation circuit occurs only under selected power line conditions involving minimum values of zero sequence voltage, zero sequence current and positive sequence voltage, to ensure the accuracy of a fault direction determination. The conductance values are processed on an adaptive basis in which the difference between the most recent conductance value and a conductance value from a selected previous point in time is determined and then compared against threshold values to make forward and reverse fault declarations.

Abstract translation: 用于检测补偿配电网中的接地故障的系统包括确定电源线上的零序电压（V0）和零序电流（I0），并从其计算零序电导（G0）。 电导计算电路的检测仅在包括零序电压，零序电流和正序电压的最小值的选定电源条件下进行，以确保故障方向确定的精度。 电导值在自适应基础上进行处理，其中确定最近电导值与选定的先前时间点之间的电导值之间的差值，然后与阈值进行比较以产生正向和反向故障声明。