Automatic voltage device and network protector incorporating...

Details Automatic voltage device and network protector incorporating... Automatic voltage device and network protector incorporating...

2006-12-12

2006-12-12

Sinead, Brian (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

Reexamination Certificate

active

07149067

ABSTRACT:
A voltage sensing device automatically scales the source and network phase voltages of a power distribution system having one of two operating voltages for input to a network protector relay and also automatically scales a voltage for operating the trip and close circuit of the circuit breaker in the network protector. A latching tap select relay only switches the system voltages to the lower operating voltage input taps of step down transformers after a short delay if all the system voltages are in the lower operating range. A diagnostic circuit verifies proper switch position and voltages before closing output contacts to connect the scaled voltages to the relay and circuit breaker.

REFERENCES:
patent: 3947728 (1976-03-01), Smith
patent: 4067054 (1978-01-01), Clark
patent: 4631625 (1986-12-01), Alexander et al.
patent: 4713608 (1987-12-01), Catiller et al.
patent: 5179291 (1993-01-01), Nishikawa et al.
patent: 5514964 (1996-05-01), Benesh et al.
patent: 6459554 (2002-10-01), Meiners et al.

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