Negative sequence directional element for a relay useful in prot

Details Negative sequence directional element for a relay useful in prot Negative sequence directional element for a relay useful in prot

1992-10-15

1994-09-20

Young, Brian K.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 65, 361 78, H02H 326

Patent

active

053494903

ABSTRACT:
A directional element measures the negative sequence voltage and the negative sequence current and from those quantities produces a scalar quantity related to the negative sequence impedance of a power transmission line relative to the location of the directional element. The scalar quantity is then compared against two threshold quantity settings, one to determine a forward fault, the other to determine a reverse fault. The scalar quantity must be less than the forward threshold quantity for a forward fault and greater than the reverse threshold quantity for a reverse fault.

REFERENCES:
patent: 4352137 (1982-09-01), Johns
patent: 4825327 (1989-04-01), Alexander et al.

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