Electricity: electrical systems and devices – Safety and protection of systems and devices – Load shunting by fault responsive means
Patent
1989-06-07
1992-10-06
DeBoer, Todd E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Load shunting by fault responsive means
361 91, 361127, 340652, 340662, H02H 320
Patent
active
051538067
ABSTRACT:
An alarm circuit for a transient voltage suppression circuit for protection of equipment using alternating current power is shown and described. This device utilizes a pair of diodes having the same terminals (polarity) connected to a node to which a resistor provides an AC voltage. The diodes conduct during one half cycle in normal operation, and the node is at a virtual ground when both diodes conduct. When a fuse from one diode to ground opens, current no longer flows and the voltage at the node rises as the other diode conducts and applies a voltage to resistors and an alarm input.
There is also disclosed a suppression circuit which provides for isolation of the ground from neutral in the event of failure of the varistor.
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