公开(公告)号：EP3139462A4

公开(公告)日：2017-07-19

申请号：EP15785909

申请日：2015-01-08

申请人： NR ELECTRIC CO LTD ,  NR ELECTRIC ENG CO LTD

发明人： ZHANG QIXUE ,  XU BAOLI ,  ZHANG JIE ,  LI HUAZHONG ,  JI YAOYAO ,  ZHONG SHOUPING ,  WANG GUANG ,  CHEN JUN ,  YAN WEI

IPC分类号： H02H7/22 ,  H02H3/04 ,  H02H3/52 ,  H02H7/06 ,  H02H7/26 ,  H02J1/02 ,  H02J3/01 ,  H02J3/24 ,  H02J3/36

CPC分类号： H02H7/20 ,  H02H3/04 ,  H02H3/52 ,  H02H7/042 ,  H02H7/06 ,  H02H7/16 ,  H02H7/267 ,  H02H7/268 ,  H02J1/02 ,  H02J3/01 ,  H02J3/24 ,  H02J3/36 ,  H02J2003/365 ,  Y02E40/40 ,  Y02E60/60

摘要： A relay protection method against LC parallel circuit detuning faults comprises the steps of: a relay protection device samples a current of a parallel LC, that is, a reactor and a capacitor, and samples a total current flowing through the whole LC; convert the current of the reactor into a current of an equivalent capacitor; calculate amplitudes of the current of the equivalent capacitor and a current of a realistic capacitor and calculate an amplitude of the total current flowing through the LC; calculate a current amplitude ratio of the equivalent capacitor to the realistic capacitor; and when the amplitude of the total current flowing through the LC is large enough, send an alarm signal or a trip after a setting time delay if the current ratio exceeds a preset upper and lower limit range. Also provided is a corresponding relay protection device. The relay protection method and device against LC parallel circuit detuning faults can improve stability of calculation results of a current ratio and raise sensitivity and rapidity of protection.

摘要翻译： 一种针对LC并联电路失谐故障的继电保护方法，包括以下步骤：继电保护装置对并联LC电流即电抗器和电容进行采样，并对流经整个LC的总电流进行采样; 将电抗器的电流转换为等效电容器的电流; 计算等效电容器的电流幅度和实际电容器的电流，并计算流过LC的总电流的幅度; 计算等效电容器与实际电容器的电流幅度比; 当流经LC的总电流幅值足够大时，如果电流比超过预设的上限和下限范围，则发出报警信号或经过设定时间延迟后跳闸。 还提供了相应的继电保护装置。 针对LC并联电路失谐故障的继电保护方法和装置，可以提高电流比计算结果的稳定性，提高保护灵敏度和快速性。