Electricity: electrical systems and devices – Safety and protection of systems and devices – Load shunting by fault responsive means
Patent
1993-08-02
1994-06-14
DeBoer, Todd
Electricity: electrical systems and devices
Safety and protection of systems and devices
Load shunting by fault responsive means
361111, 361120, 361127, H02H 904
Patent
active
053215753
ABSTRACT:
A transient voltage suppression circuit consists of energy dissipation components with one end connected either to a line or a neutral wire of a power line and the other end connected to a reed switch which, in turn, is connected to ground. The reed switch, which is an encapsulated switch consisting of two metal strips with a gap between them, is in an open position, and accordingly, does not under normal operating conditions provide a path to ground for the associated energy dissipation components. The energy dissipation components thus do not conduct. When a transient having a sufficiently high voltage occurs between the line or neutral wires and the ground wire, it causes the reed switch to conduct momentarily, that is, spark, across the gap. The switch momentarily forms a path to ground and allows the associated energy dissipation components to shunt a transient current away from protected appliances. The reed switch gap size is chosen such that the switch can withstand, without conducting, various high-voltage tests. The circuit can thus remain operative without affecting the testing of the protected appliances.
REFERENCES:
patent: 4060842 (1977-11-01), Allen
patent: 4698721 (1987-10-01), Warren
patent: 4912589 (1990-03-01), Stolarczyk
DeBoer Todd
Digital Equipment Corporation
Maloney Denis G.
Paciulan Richard J.
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