Method for determining the direction of the origin of a disturba

Details Method for determining the direction of the origin of a disturba Method for determining the direction of the origin of a disturba

1984-10-31

1985-12-24

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01R 3108, H02H 338

Patent

active

045609225

ABSTRACT:
A directional relay for providing indication of the direction of a fault on an electric power transfer network has an adder (9), a subtractor (10) and filters (11) which receive signals from voltage and current transformers (6,7) and derive signals related to fault-induced forward and backward transient waves on the network. To ensure reliable operation even when the relay is close to a low impedance element such as a generator (2), the forward wave related signal is delayed in a delay unit (12) by an amount equal to the propagation time of the wave along the section protected by the relay, before the difference between its square and that of the backward wave related signal are integrated (16) to derive the fault direction signal. If the protected section has a low distributed capacitance, the voltage and current signals can instead be combined by a differentiator (22) and adder (23) and filtered (11B) to produce a signal related to the forward transient wave appearing at a point X along the protected section. The integrator (16) receives the product of this signal and the filtered current signal.

REFERENCES:
patent: 4063160 (1977-12-01), Lanz
patent: 4063162 (1977-12-01), Lanz
patent: 4063164 (1977-12-01), Lanz
patent: 4063165 (1977-12-01), Lanz
patent: 4063166 (1977-12-01), Glasvitsch
patent: 4251766 (1981-02-01), Souillard
patent: 4351011 (1982-09-01), Liberman
patent: 4352137 (1982-09-01), Johns

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