Over-voltage protection

Details Over-voltage protection Over-voltage protection

1976-04-29

1978-01-03

Miller, J D

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 55, 361 77, H02H 320

Patent

active

040670546

ABSTRACT:
An over-voltage protection apparatus includes an over-voltage detector measuring the voltage between each energized conductor and a neutral or ground line associated therewith series connected between an A.C. power source and a utilization device and an over-current protection device, such as a circuit breaker, to disconnect the conductors from the energy source in the event the voltage on any one of the energized lines exceeds a predetermined threshold voltage. Suitable over-voltage detectors consist of any device which is non-conductive for all input voltages less than a threshold voltage and are conductive after the input voltage has exceeded the threshold voltage.
The over-voltage protection apparatus described is applied to A.C. power circuits having at least one phase and at least two wires. Use of the apparatus to also provide protection in the event of an open neutral line condition, when unequal loads are present between at least two energized conductors and the neutral line is also described.

REFERENCES:
patent: 3243658 (1966-03-01), Blackburn
patent: 3766434 (1973-10-01), Sherman
patent: 3944891 (1976-03-01), McDonald
patent: 3946282 (1976-03-01), Weiss et al.
patent: 3987341 (1976-10-01), Clark

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