Protection Device
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United States of America Patent
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N/A
Issued Date -
Feb 3, 2011
app pub date -
Mar 26, 2009
filing date -
Mar 31, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An overvoltage protection circuit is provided for protecting a load against overload damage, including a coarse protection device for dissipating the major portion of the energy of the trouble event, a plurality of fine protection devices for limiting the remaining portion of the trouble energy to a safe value, a diagnostic arrangement for determining the operating condition of the destructible fine protection devices, and a disconnect arrangement for disconnecting from the protection circuit at least one of the fine protection devices that has been determined to be faulty. A trouble event identifying arrangement compares with a reference voltage standard a measured voltage existing at a measuring junction between the fine protection devices, and generates a fault signal in the event of destruction of a fine protection device. A display arrangement indicates whether or not a fine protection device has been determined to be faulty.
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