Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location
Patent
1994-09-23
1996-02-20
Wieder, Kenneth A.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
For fault location
324509, 324111, 324521, 361 79, 361 87, G01R 3114
Patent
active
054932289
ABSTRACT:
A method and a device, after a fault has occurred in a power network, for measuring and recreating the phase currents I.sub.B prior to the occurrence of the fault by determining continuously, starting from sampled measured values of the phase currents up to the time of the fault for each phase, the amplitude I and the phase angle .phi. of the phase currents based on two consecutive sampled measured values, whereupon a comparison is made between the last determined value I.sub.k obtained and the rated current I.sub.n of the power network. If I.sub.k is greater than I.sub.n, it is considered that a fault has occurred and the phase currents prior to the fault are indicated as I.sub.B =I.sub.k-1 .multidot.sin (.phi..sub.k-1 +.omega.(t-t.sub.k-1)).
REFERENCES:
patent: 4529929 (1985-07-01), Berggren
patent: 4694402 (1987-09-01), McEachern
patent: 4795983 (1989-01-01), Crockett
patent: 4878142 (1989-10-01), Bergman
"An Accurate Fault Locator . . . ", IEEE Transactions on Power Apparatus and Systems, vol. PAS-104, No. 2, Feb. 1985, pp. 424-436.
"High-Speed Distance Relaying . . . ", IEEE Transactions on Power Apparatus and Systems, vol. 91, No. 3, May/Jun. 1972, pp. 1235-1243.
Eriksson Leif
Saha Murari M.
Asea Brown Boveri AB
Solis Jose M.
Wieder Kenneth A.
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