Method and a device for fault location in the event of a fault o

Details Method and a device for fault location in the event of a fault o Method and a device for fault location in the event of a fault o

1989-03-22

1990-03-06

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

324521, G01R 3108

Patent

active

049069373

ABSTRACT:
A device for determining the location of a fault at a fault position (F) on a power transmission line between two stations (P, Q), and in which the power transmission line has an unknown conduction impedance (Z.sub.PQ), wherein, at one of the stations (P), capacitive voltage measuring transformers measure the phase voltage (U.sub.PM) and the phase currents (I.sub.P) or changes in the phase currents (.DELTA.I.sub.P) are measured on the occurrence of a fault. The phase voltage, phase currents or changes in the phase currents are low pass filtered; and the filtered phase voltage, phase currents or the change in the phase currents are converted from an analog to instantaneous digitized phase voltage, phase currents or changes in phase current values, respectively.
The fault distance .alpha. and a value of an apparent fault resistance R.sub.F at the fault location are calculated, using linear regression, on the basis of the relationship:

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