Varistor overvoltage protection system with temperature systems
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United States of America Patent
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-
Jan 13, 1987
Grant Date -
N/A
app pub date -
Apr 30, 1985
filing date -
Apr 11, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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