Method and apparatus for detecting faults in an electric power d

Details Method and apparatus for detecting faults in an electric power d Method and apparatus for detecting faults in an electric power d

1978-06-05

1980-04-01

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With tuned circuit

361 85, 361 87, H02H 326

Patent

active

041964632

ABSTRACT:
Open conductors in an electric power distribution system are detected by sensing the abrupt change in balance of transformer magnetizing current among phases, particularly the third harmonic of the power system frequency. The current is sensed in each phase and the absolute magnitude of the third harmonic current is compared among the phases. When imbalance exceeds a predetermined value, a signal is produced.

REFERENCES:
patent: 2120855 (1938-06-01), Buell
patent: 3013185 (1961-12-01), Forsyth et al.
patent: 3284673 (1966-11-01), Shimada
patent: 3308345 (1967-03-01), Warrington
patent: 3515943 (1970-06-01), Warrington

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