公开(公告)号：EP3007294A1

公开(公告)日：2016-04-13

申请号：EP14804991.9

申请日：2014-04-14

申请人： NR Electric Co., Ltd. ,  NR Engineering Co., Ltd

发明人： ZHANG, Qixue ,  CHEN, Jun ,  YAN, Wei ,  SHI, Xiangjian ,  YAN, Wei ,  LIU, Weiqun ,  SHEN, Quanrong ,  WANG, Guang

IPC分类号： H02H7/26

CPC分类号： H02M1/32 ,  H02H3/305 ,  H02H3/307 ,  H02H7/1216 ,  H02M7/04

摘要： Embodiments of the present invention disclose a differential protection method for current source converter, including: sampling, by a relay protection device, secondary side currents of current transformers on two sides of a protected current source converter, to obtain incomer-side three-phase currents, and outgoer-side three-phase currents; rectifying the incomer-side three-phase currents and the outgoer-side three-phase currents, to obtain an incomer-side input current and an outgoer-side output current which are equivalent; converting the incomer-side input current and the outgoer-side output current according to a current ratio of the current transformers on the two sides, to acquire a transient differential current and a transient restraint current; acquiring a differential current and a restraint current according to the transient differential current and the transient restraint current; and achieving differential protection according to the differential current and the restraint current. The embodiments of the present invention further disclose a relay protection device correspondingly.