Fault current filter

Details Fault current filter Fault current filter

1993-06-14

1995-03-21

Wieder, Kenneth A.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

324509, 324522, 324543, G01R 3108

Patent

active

053999746

ABSTRACT:
A method and a device for determining the fault current which occurs in case of a fault through a short circuit between phases or from phase/phases to ground. A measure of the fault current can be obtained by a linear combination of the sum of measured current samples for each phase at two adjacent points in time and in which each of these sample values is multiplied by a coefficient which is chosen such that the fault current gets into phase with the positive- and negative-sequence current changes.

REFERENCES:
patent: 4176312 (1979-11-01), Wrinn
patent: 4851782 (1989-07-01), Jeerings et al.
patent: 4985843 (1991-01-01), Kotani
Microprocessor-Implemented Digital Filters for the Calculation of Symmetrical Components, Degens, IEE Proc., vol. 129, Pt. C, No. 3, May 1982; pp. 111-118.
An Accurate Fault Locator with Compensation for Apparent Reactance in the Fault Resistance Resulting from RemoteEnd Infeed, Saha et al.; IEEE Transactions on Power Apparatus vol. PAS-104, No. 2; Feb., 1985; pp. 424-436.
Accurate Fault Impedance Locating Algorithm; Wiszniewski; IEEE Proc., vol. 130, Pt. C, No. 6, Nov. 1983, pp. 311-314.

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