Detection of subsidence current in the determination of circuit

Details Detection of subsidence current in the determination of circuit Detection of subsidence current in the determination of circuit

1997-10-16

1999-06-22

Wu, Daniel J.

Communications: electrical

Condition responsive indicating system

Specific condition

340635, 340644, 361 93, 324424, 335 17, G08B 2100

Patent

active

059146630

ABSTRACT:
The apparatus detects subsidence current from unfiltered as well as filtered secondary current values in the current transformer. A lack of zero crossings during a predetermined period is a reliable indication of the presence of subsidence current. If subsidence current is detected, then a signal is generated which indicates that the circuit breaker for the power system has opened, providing an accelerated indication thereof relative to an indication produced by an overcurrent element dropping out.

REFERENCES:
patent: 4685024 (1987-08-01), Martellock et al.
patent: 4788619 (1988-11-01), Ott et al.
patent: 5233330 (1993-08-01), Hase
patent: 5510773 (1996-04-01), Rodgers
Transient Response of Current Transformers, IEEE, New York, N.Y. Jan. 1976.
How Can Current Dropout Affect Breaker Failure Timing Margins?, 49th Annual Conf. , Protective Relay Engineers, Texas A&M Univ., Apr. 1996.
Operating Manual, Basler Electric, No. 9-1906-00-990.

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