公开(公告)号：US10734803B2

公开(公告)日：2020-08-04

申请号：US15574390

申请日：2015-05-26

Applicant: ABB Power Grids Switzerland AG

Inventor： YouYi Li ,  Kai Liu ,  Jianping Wang

IPC: G01R31/08 ,  H02H7/26 ,  G01R31/11 ,  G01R23/167 ,  H02H1/00 ,  H02H3/44 ,  G01R31/40

Abstract: There is provided mechanisms for travelling wave protection of a transmission line. A method includes 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 the current and/or voltage measurement. The method includes providing a result of the high-pass filtering as input to a trip decision maker performing travelling wave detection.

公开(公告)号：US11112445B2

公开(公告)日：2021-09-07

申请号：US15570493

申请日：2015-05-28

Applicant: ABB Power Grids Switzerland AG

Inventor： YouYi Li ,  Jianping Wang ,  Kai Liu

IPC: G01R31/08 ,  G01R31/327 ,  H02H7/26

Abstract: A mechanism for travelling wave pilot protection of a transmission line and method for receiving indications of a travelling wave from two terminals of a transmission line, wherein two terminals are time synchronized. The method includes making a trip decision based on the indications using a short trip window. An arrangement is configured to perform the disclosed method.

公开(公告)号：US20200335967A1

公开(公告)日：2020-10-22

申请号：US16956348

申请日：2017-12-20

Applicant: ABB Power Grids Switzerland AG

Inventor： YouYi Li ,  Kai Liu ,  Jianping Wang

IPC: H02H7/22 ,  H02H1/00

Abstract: There is provided mechanisms for zero sequence differential protection of a transmission line of a power system. An arrangement comprises a zero sequence differential protection unit configured for, using current measurements of each phase A, B, C of the transmission line, internal fault detection of the transmission line. The arrangement comprises a phase selection unit configured for, using a comparison of differential values of the current measures for each phase, determination of whether any of the phases A, B, C of the transmission line is faulty or not. A trip is caused by the zero sequence differential protection unit when an internal fault is detected by the zero sequence differential protection unit, and the trip starts all the phases A, B, C for the phase selection unit to finalize the trip for said any faulty phase.

公开(公告)号：US20200319262A1

公开(公告)日：2020-10-08

申请号：US16832864

申请日：2020-03-27

Applicant: ABB Power Grids Switzerland AG

Inventor： YouYi Li ,  Jianping Wang ,  Aken-Kai Liu

IPC: G01R31/58 ,  H02H1/00 ,  H02H7/22

Abstract: A method can be used for fault detection of a transmission. The method includes obtaining instantaneous measurements of local voltages and local currents of the transmission line, obtaining filtered measurements of the local voltages and local currents by subjecting the measurements of the local voltages and local currents to low pass filtering, obtaining a compensated voltage calculated by subjecting the filtered measurements to a differential equation based algorithm, and performing fault detection by forming a ratio between the compensated voltage and the a reference voltage. An internal fault is determined when the ratio is below a threshold and an external fault is determined when ratio is larger than above the threshold.