公开(公告)号：US20160006240A1

公开(公告)日：2016-01-07

申请号：US14770240

申请日：2013-04-07

Applicant: YOUYI LI ,  KAI LIU ,  IVO BRNCIC ,  ZHANPENG SHI ,  ABB TECHNOLOGY LTD.

Inventor： YOUYI LI ,  KAI LIU ,  IVO BRNCIC ,  ZHANPENG SHI

IPC: H02H9/02

CPC classification number: H02H9/02 ,  H02H3/006 ,  H02H3/28 ,  H02H3/283 ,  H02H7/045

Abstract: 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.

Abstract translation: 本发明公开了一种故障检测方法及其电流差动保护系统。 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调整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CT饱和严重的情况，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。