Negative sequence directional element for a relay useful in...

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

G - Physics

01

R

G01R 31/08 (2006.01) H02H 3/40 (2006.01) H02H 7/26 (2006.01) H02H 3/08 (2006.01)

Patent

CA 2108443

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.

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