公开(公告)号：US20180024183A1

公开(公告)日：2018-01-25

申请号：US15701221

申请日：2017-10-16

Applicant: ABB Schweiz AG

Inventor： Kai Liu ,  Youyi Li ,  Jianping Wang

IPC: G01R31/08 ,  H02H7/26

CPC classification number: G01R31/085 ,  G01R31/086 ,  G01R31/088 ,  H02H7/265 ,  H02J13/00 ,  Y04S10/522

Abstract: An objective of the application is to provide a method for detecting a disturbance in a power system within a digital substation and an apparatus using the same. The method includes: sensing electrical parameters at an end of a transmission line; sampling the sensed electrical parameters; extracting traveling-wave information from high frequency component of the samples using a signal processing method; and if the extracted traveling-wave information indicating occurrence of the disturbance, transmitting the extracted traveling-wave information to an intelligent electronic device of the digital substation from a merging unit or non-conventional instrument transformer of the digital substation. As compared with the amount of the sample data of the sensed electrical parameters, the amount of the data representing the extracted traveling-wave information is reduced. Thus the extracted traveling-wave information can be transmitted via a data link with a relatively narrow bandwidth, such as the process bus under standard IEC 61850.

公开(公告)号：US09618586B2

公开(公告)日：2017-04-11

申请号：US14655298

申请日：2013-02-12

Applicant: ABB Schweiz AG

Inventor： Reynaldo Nuqui ,  Jiuping Pan ,  Jianping Wang

IPC: H02H3/06 ,  G01R31/40 ,  G01R31/02 ,  H02H3/087 ,  H02H7/26

CPC classification number: G01R31/40 ,  G01R31/025 ,  H02H3/087 ,  H02H7/268

Abstract: A method to facilitate fault detection in the protected unit after connection to the at least a portion of the power system. A current is sensed in the protected unit during a plurality of different time periods. Compliance of at least one of the sensed currents with a respective first current criteria is determined based on a first current threshold value. On a condition that there is determined that at least one of the sensed currents comply with the respective first current criteria, a fault in the protected unit is detected.

公开(公告)号：US10295586B2

公开(公告)日：2019-05-21

申请号：US16060680

申请日：2016-01-20

Applicant: ABB Schweiz AG

Inventor： YouYi Li ,  Kai Liu ,  Jianping Wang

IPC: G01R1/00 ,  H02H7/22 ,  H02J1/00 ,  G01R31/08 ,  H02H7/26 ,  H02M1/00

Abstract: There is provided mechanisms for detecting a fault of a transmission line (20) in a power system (10) comprising at least one of an extreme weak system (10a) and an extreme strong system (10b). A method comprises obtaining travelling wave polarities from two terminals (21a, 21b) of the transmission line during occurrence of the fault, the travelling wave polarities being defined by two current polarities and two voltage polarities. The method comprises determining the obtained travelling wave polarities to be detectable and the obtained travelling wave polarities to be non-detectable. The method comprises detecting the fault to be internal based on the detectable travelling wave polarities and the non-detectable travelling wave polarities. There is also provided an arrangement configured to perform such a method.