公开(公告)号：US09316671B2

公开(公告)日：2016-04-19

申请号：US14433204

申请日：2012-10-03

Applicant: ABB TECHNOLOGY LTD

Inventor： Niclas Johannesson

IPC: G01R15/18 ,  G01R31/40

CPC classification number: G01R31/085 ,  H02H3/28 ,  H02H3/305 ,  H02H7/265

Abstract: A fault sensing system for a power system including a protected unit is disclosed. The fault sensing system is adapted to sense a fault in the protected unit. The fault sensing system includes at least one current sensing unit adapted to sense at least one first current in a first position in the protected unit and at least one second current in the second position in the protected unit and at least one voltage sensing unit adapted to sense at least one first voltage in the first position and at least one second voltage in the second position, and at least one processing unit. The at least one processing unit is adapted to model any distortion, attenuation and/or delay of the waveform of a wave due to propagation of the wave in the protected unit by means of a propagation function, determine at least one first travelling wave current in the first position based on the at least one first current and the at least one first voltage, determine at least one second travelling wave current in the second position based on the at least one second current and the at least one second voltage, estimate at least one of the at least one first travelling wave current and the at least one second travelling wave current by applying the propagation function to the at least one second travelling wave current or to the at least one first travelling wave current, respectively, on a condition that the at least one first travelling wave current is estimated, compare the estimated at least one first travelling wave current with the determined at least one first travelling wave current, on a condition that the at least one second travelling wave current is estimated, compare the estimated at least one second travelling wave current with the determined at least one second travelling wave current, and, based on the comparison or comparisons, determine whether there is a fault in the protected unit.

Abstract translation: 公开了一种用于包括受保护单元的电力系统故障检测系统。 故障感测系统适用于检测受保护单元中的故障。 故障感测系统包括至少一个电流感测单元，适于感测受保护单元中的第一位置中的至少一个第一电流和受保护单元中的第二位置中的至少一个第二电流，以及至少一个电压感测单元， 感测第一位置中的至少一个第一电压和第二位置中的至少一个第二电压，以及至少一个处理单元。 所述至少一个处理单元适于通过传播函数来建模由于受保护单元中波的传播引起的波形波形的任何失真，衰减和/或延迟，确定至少一个第一行波电流 基于所述至少一个第一电流和所述至少一个第一电压的所述第一位置基于所述至少一个第二电流和所述至少一个第二电压来确定所述第二位置中的至少一个第二行波电流，至少估计 分别通过将传播函数应用于至少一个第二行波电流或至少一个第一行波电流，分别在至少一个第一行波电流和至少一个第二行波电流中的一个，条件是 估计至少一个第一行波电流，将估计的至少一个第一行波电流与所确定的至少一个第一行波波形比较 在估计所述至少一个第二行波电流的条件下，将估计的至少一个第二行波电流与所确定的至少一个第二行波电流进行比较，并且基于所述比较或比较来确定是否存在 是受保护单位的错误。