Electricity: electrical systems and devices – Safety and protection of systems and devices – Load shunting by fault responsive means
Patent
1991-06-25
1993-06-29
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Load shunting by fault responsive means
361118, 361127, H02H 324
Patent
active
052240088
ABSTRACT:
A surge protection system has a surge protection device comprising a semiconducting disc element disposed between two electrodes. The element is operable to selectively conduct electrical energy between the electrodes in providing a first level of surge protection for the circuit, and the electrodes are adapted to move toward each other to maintain a short circuit condition between the electrodes in the event the element is destroyed in providing a second relatively greater level of surge protection. The semiconducting element provides a critical energy conduction path between a selected limited portion of one side of the element and the other element side along which destruction of the element preferentially occurs due to overheating in providing the second level of surge protection. One electrode has a selected limited post portion disposed in electrical engagement with said selected limited portion of said one element side to facilitate establishment and maintenance of the short circuit condition between the electrodes in providing the second level of surge protection.
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"Telecommunications Protector Circuits-Protection Design Guide", Texas Instruments Ltd., Bedford England.
Candelet Ronald J.
Popat Pravin
Unterweger Diethard
Baumann Russell E.
Donaldson Richard L.
Grossman Rene E.
Jackson S.
Pellinen A. D.
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