Protective apparatus, methods of operating same and phase window

Details Protective apparatus, methods of operating same and phase window Protective apparatus, methods of operating same and phase window

1986-08-29

1988-07-12

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 85, 361 86, 361 91, 340658, 340660, H02H 326

Patent

active

047574160

ABSTRACT:
A protective apparatus for use in an A.C. electrical power system with a circuit breaker for connecting and disconnecting first and second electrical conductors that are electrically energizable, the conductors normally having a negligible phase difference of electrical energization when the circuit breaker is closed, and the circuit breaker having auxiliary contacts defining the state of the circuit breaker as open or closed. The protective apparatus includes a circuit responsive to the auxiliary contacts for producing a first signal representative of the state of the breaker as open or closed and another circuit connected to the circuit for producing the first signal and operable when the breaker is closed for generating a second signal when the phase difference of electrical energization of the first and second electrical conductors exceeds a predetermined value. A further circuit provides an indication of malfunction of the circuit breaker when the second signal occurs. Phase window extending apparatus for use in the protective apparatus, methods of operation and other protective apparatus are also disclosed.

REFERENCES:
patent: 3597735 (1971-08-01), Nakayama
patent: 3831061 (1974-08-01), Boyd
patent: 4293886 (1981-10-01), Church et al.
patent: 4535409 (1985-08-01), Jindrick et al.
patent: 4538196 (1985-08-01), Sun et al.
patent: 4538197 (1985-08-01), Breen
patent: 4604674 (1986-08-01), Hamel
Westinghouse, Applied Protective Relaying, 1982, cover sheet, face sheet, pp. 16-26, 16-27, 20-1, 20-2, 20-11 and 20-12.

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