Computationally-efficient distance relay for power transmission

Details Computationally-efficient distance relay for power transmission Computationally-efficient distance relay for power transmission

1992-08-27

1994-06-28

Strecker, Gerard R.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

324521, 324524, 361 80, G01R 3108, H02H 326

Patent

active

053250613

ABSTRACT:
The relay includes means for obtaining current and voltage samples on the power transmission line for a particular possible fault type. The current sample is multiplied by the replica impedance of the power transmission line, while the voltage sample is multiplied by a polarizing voltage to provide a first complex expression having a real portion and an imaginary portion. The product of the current sample and the replica impedance is multiplied by the polarizing voltage to produce a second complex expression having a real portion and an imaginary portion. The real portion of the first complex expression is then divided by the real portion of the second complex expression to produce a scale value m which is compared against known reference scale values for each zone, so as to determine underimpedance conditions in any one of the zones.

REFERENCES:
patent: 3340434 (1967-09-01), Riebs
patent: 4148087 (1979-04-01), Phadke
patent: 4251766 (1981-02-01), Souillard
patent: 4329727 (1982-05-01), Premerlani
patent: 4433353 (1984-02-01), Wilkinson
patent: 4906937 (1990-03-01), Wikstrom et al.
patent: 5140492 (1992-08-01), Schweitzer, III

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