公开(公告)号：DE69921112T2

公开(公告)日：2005-10-13

申请号：DE69921112

申请日：1999-02-19

Applicant: ABB AB VAESTERAAS

Inventor： SAHA MURARI ,  ROSOLOWSKI EUGENIUSZ

IPC: G01R31/08

Abstract: In a medium-voltage network, a method and a device for location of a fault on one of the lines having loaded branches. Common voltage and sum current are measured centrally prior to and after the occurrence of a fault. Positive sequence impedance of the line and a fictitious value of the positive-sequence impedance of the line, as viewed from each branch, is determined. A change of the fictitious value of two consecutive branches from a positive to a negative value is interpreted as if the fault is located on the intermediate line section. The fictitious value defines the distance on the line section from the branch with the latest positive value to the fault. The total distance to the fault is equal to the sum of the line sections up to the branch having positive values plus the distance of the faulty line section.

公开(公告)号：DE69830339T2

公开(公告)日：2005-11-10

申请号：DE69830339

申请日：1998-12-18

Applicant: ABB AB VAESTERAAS

Inventor： SAHA MURARI ,  IZYKOWSKI JAN ,  ROSOLOWSKI EUGENIUSZ ,  KASZTENNY BOGDAN

IPC: G01R31/08

Abstract: The present invention relates to a method for locating a fault on a power transmission line which is series-compensated with capacitors. The site of the fault is determined with the aid of measured currents and voltages at one of the two ends of the power transmission line before and after the occurrence of the fault and a calculating algorithm based on impedance models of the power transmission line before and after the occurrence of the fault.

公开(公告)号：DE69830339D1

公开(公告)日：2005-06-30

申请号：DE69830339

申请日：1998-12-18

Applicant: ABB AB VAESTERAAS

Inventor： SAHA MURARI ,  IZYKOWSKI JAN ,  ROSOLOWSKI EUGENIUSZ ,  KASZTENNY BOGDAN

IPC: G01R31/08

Abstract: The present invention relates to a method for locating a fault on a power transmission line which is series-compensated with capacitors. The site of the fault is determined with the aid of measured currents and voltages at one of the two ends of the power transmission line before and after the occurrence of the fault and a calculating algorithm based on impedance models of the power transmission line before and after the occurrence of the fault.

公开(公告)号：DE69921112D1

公开(公告)日：2004-11-18

申请号：DE69921112

申请日：1999-02-19

Applicant: ABB AB VAESTERAAS

Inventor： SAHA MURARI ,  ROSOLOWSKI EUGENIUSZ

IPC: G01R31/08

Abstract: In a medium-voltage network, a method and a device for location of a fault on one of the lines having loaded branches. Common voltage and sum current are measured centrally prior to and after the occurrence of a fault. Positive sequence impedance of the line and a fictitious value of the positive-sequence impedance of the line, as viewed from each branch, is determined. A change of the fictitious value of two consecutive branches from a positive to a negative value is interpreted as if the fault is located on the intermediate line section. The fictitious value defines the distance on the line section from the branch with the latest positive value to the fault. The total distance to the fault is equal to the sum of the line sections up to the branch having positive values plus the distance of the faulty line section.