Through fault pressure filter for fault pressure relay
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United States of America Patent
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Jul 13, 1982
Grant Date -
N/A
app pub date -
Dec 9, 1977
filing date -
Dec 9, 1977
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Methods and apparatus are provided for attenuating through-fault pressure disturbances in fault relays for a liquid-filled transformer. The method comprises the interposition of a mechanical filter between the transformer and the relay for attenuating through fault pressure variations while passing internal pressure faults. The filter consists of a pressure attenuation passage having an optimum length to diameter ratio for attenuating higher frequency pressure oscillations in excess of 50 Hz.
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