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

1993-06-28

1994-11-15

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 84, H02H 326

Patent

active

053653963

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 magnitude of the negative sequence impedance is calculated from the magnitude of the negative sequence voltage and magnitude of the negative sequence current. The scalar quantity is then compared against two threshold quantity settings, one to determine a forward fault and the other to determine a reverse fault. The threshold quantity settings include, respectively, a selected fraction of preselected basic threshold values and a selected fraction of the magnitude of the negative sequence impedance. 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: 4458285 (1984-07-01), De Mesmaeker
patent: 4686601 (1987-08-01), Alexander et al.
patent: 4825327 (1989-04-01), Alexander et al.

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