Electricity: electrical systems and devices – Safety and protection of systems and devices – Circuit interruption by thermal sensing
Patent
1985-04-30
1987-01-13
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Circuit interruption by thermal sensing
361 55, H02H 504
Patent
active
046369104
ABSTRACT:
A system having a bus protected against overvoltage by a plurality of series connected zinc oxide varistors in a column, uses temperature sensors to protect the varistors from damage. First temperature sensors detect that a safety tripping temperature has been reached and lower the bus voltage. Second temperature sensors detect a thermal runaway temperature has been reached and disconnect the bus. Normal operation is restored when the detected temperature falls below the safety tripping temperature. To protect against very rapidly increasing overvoltages, the current flow is monitored and when it exceeds a threshold a signal representing current is integrated. When the integrated value reaches a first preset level the voltage on the bus is reduced and when it reaches a second preset level the bus is disconnected to permit the varistors to cool.
REFERENCES:
patent: 4174529 (1979-11-01), Hamman
patent: 4432029 (1984-02-01), Lundquist
Canadian General Electric Company Limited
Eckersley Raymond A.
Gaffin Jeffrey A.
Pellinen A. D.
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