Overvoltage protector

Details Overvoltage protector Overvoltage protector

1979-04-16

1981-09-08

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 91, 361111, H02H 320

Patent

active

042888301

ABSTRACT:
High voltage transients, such as from lightning strikes, on an AC carrying power line are suppressed by unique protection circuitry. Voltage on the line is sensed and should it exceed a predetermined reference level an appropriate one of two silicon controlled rectifiers is activated. The rectifiers are connected in series with a voltage dependant resistor and the resultant network is coupled between the terminals of the power line. The network is effectively an open circuit under exposure to the periodic waveform normally existing on the power line. Upon occurrence of a high voltage transient, the combination of one of the rectifiers and the voltage dependant resistor switches to a low impedance state, thereby accomplishing suppression.

REFERENCES:
patent: 3277460 (1966-10-01), Heckman
patent: 3333114 (1967-07-01), Molnar et al.
patent: 3375405 (1968-03-01), Fallon et al.
patent: 3443223 (1969-05-01), Kennon
patent: 3469188 (1969-09-01), Hall
patent: 3475653 (1969-10-01), Odenberg et al.
patent: 3493815 (1970-02-01), Hurtle
patent: 3573550 (1971-04-01), Baker, Jr.
patent: 3603843 (1971-09-01), Clements
patent: 3934175 (1976-01-01), Clark

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