公开(公告)号：US20180358802A1

公开(公告)日：2018-12-13

申请号：US15780524

申请日：2016-01-27

申请人： ABB Schweiz AG

发明人： Ivo Brncic ,  Zhanpeng Shi ,  Sören Forsman

IPC分类号： H02H7/045 ,  H02H1/00

CPC分类号： H02H7/0455 ,  H02H1/0092 ,  H02H3/006 ,  H02H3/283 ,  H02H7/045

摘要： A method of current differential protection performed in a control device is disclosed, wherein the control device has a first operate-restrain characteristic with a differential characteristic pick-up setting ID. The method includes: determining currents of all terminals of a protected object; determining a differential current based on the determined currents; determining direct current, DC, components in the respective determined currents; detecting a fault; and adjusting, for a detected external fault, the operate-restrain characteristics by setting an adjusted differential characteristic pick-up setting ID_adj to be equal to the sum of the differential characteristic pick-up setting ID and the determined DC components, providing an adapted operate-restrain characteristics. Corresponding control device, computer program and computer program product are also disclosed.

公开(公告)号：US10243351B2

公开(公告)日：2019-03-26

申请号：US15780524

申请日：2016-01-27

申请人： ABB Schweiz AG

发明人： Ivo Brncic ,  Zhanpeng Shi ,  Sören Forsman

IPC分类号： H02H7/045 ,  H02H3/28 ,  H02H1/00 ,  H02H3/00

摘要： A method of current differential protection performed in a control device is disclosed, wherein the control device has a first operate-restrain characteristic with a differential characteristic pick-up setting ID. The method includes: determining currents of all terminals of a protected object; determining a differential current based on the determined currents; determining direct current, DC, components in the respective determined currents; detecting a fault; and adjusting, for a detected external fault, the operate-restrain characteristics by setting an adjusted differential characteristic pick-up setting ID_adj to be equal to the sum of the differential characteristic pick-up setting ID and the determined DC components, providing an adapted operate-restrain characteristics. Corresponding control device, computer program and computer program product are also disclosed.

公开(公告)号：US09899830B2

公开(公告)日：2018-02-20

申请号：US14770240

申请日：2013-04-07

申请人： ABB Schweiz AG

发明人： Youyi Li ,  Kai Liu ,  Ivo Brncic ,  Zhanpeng Shi

IPC分类号： H02H9/02 ,  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.