公开(公告)号：EP2859635A4

公开(公告)日：2016-04-06

申请号：EP12878421

申请日：2012-06-06

申请人： ABB TECHNOLOGY LTD

发明人： LI YOUYI ,  LIU KAI ,  SU BIN

IPC分类号： H02H3/28 ,  G01R31/327 ,  H04B14/06

CPC分类号： G01R31/3278 ,  H02H3/28 ,  H02H3/283

摘要： The present invention discloses a method for identifying the fault by current differential protection and a device thereof. The method comprises: measuring the full component currents of the two terminals of a two-terminal line system and calculating the corresponding fault component current vectors; obtaining an operate value by calculating a first difference between an absolute value of the sum of the fault component current vectors and Iset1; obtaining a restrain value by multiplying a second difference with a control factor, in which the second difference is calculated between the maximum of the absolute values of the fault component currents and Iset2 or between the absolute value of the difference of said fault component currents and Iset2; and identifying a fault as an external one or internal one by comparing the operate value with the restrain value. The solutions of the present invention achieve better reliability, sensitivity and faster speed than existing products.

公开(公告)号：EP2984719A4

公开(公告)日：2016-12-07

申请号：EP13881637

申请日：2013-04-07

申请人： ABB TECHNOLOGY LTD

发明人： LI YOUYI ,  LIU KAI ,  BRNCIC IVO ,  SHI ZHANPENG

IPC分类号： H02H3/28 ,  H02H3/00 ,  H02H7/045

CPC分类号： H02H9/02 ,  H02H3/006 ,  H02H3/28 ,  H02H3/283 ,  H02H7/045

摘要： The present invention discloses a method for detecting a fault and a current differential protection system thereof. The method for detecting fault includes calculating fault component currents, calculating an operate current and a restraint current of all terminals, and adjusting an operate level by adapting an operate-restraint characteristic according to a fault component. The method has very small operating area for external faults, which makes the method very reliable even for the case with serious CT saturation. A very big operating area for internal faults makes the method very sensitive for internal faults even for a heavy load and high resistance fault.

摘要翻译： 本发明公开了一种故障检测方法及其电流差动保护系统。 用于检测故障的方法包括计算故障分量电流，计算所有终端的工作电流和约束电流，以及通过根据故障分量适应操作限制特性来调整操作电平。 该方法对外部故障的操作面积非常小，即使对于严重CT饱和的情况，该方法也非常可靠。 内部故障的非常大的操作区域使得该方法对于内部故障甚至对于重负载和高电阻故障也非常敏感。

公开(公告)号：EP3304668A1

公开(公告)日：2018-04-11

申请号：EP15724309

申请日：2015-05-26

申请人： ABB TECHNOLOGY LTD

发明人： LI YOUYI ,  LIU KAI ,  WANG JIANPING

IPC分类号： H02H7/26 ,  G01R31/08

CPC分类号： H02H7/265 ,  G01R31/08 ,  G01R31/11

摘要： There is provided mechanisms for travelling wave protection of a transmission line. A method comprises performing high-pass filtering of a current and/or voltage measurement of a transmission line so as to detect fault-caused high-frequency components of said current and/or voltage measurement. The method comprises providing a result of said high-pass filtering as input to a trip decision maker performing travelling wave detection.