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Title: In-situ fault detection apparatus and method for an encased energy storing device

An apparatus and method for detecting a breach in an electrically insulating surface of an electrically conductive power system enclosure within which a number of series connected energy storing devices are disposed. The energy storing devices disposed in the enclosure are connected to a series power connection. A detector is coupled to the series connection and detects a change of state in a test signal derived from the series connected energy storing devices. The detector detects a breach in the insulating layer of the enclosure by detecting a state change in the test signal from a nominal state to a non-nominal state. A voltage detector detects a state change of the test signals from a nominal state, represented by a voltage of a selected end energy storing device, to a non-nominal state, represented by a voltage that substantially exceeds the voltage of the selected opposing end energy storing device. Alternatively, the detector may comprise a signal generator that produces the test signal as a time-varying or modulated test signal and injects the test signal into the series connection. The detector detects the state change of the time-varying or modulated test signal from a nominal state, represented by a signal substantiallymore » equivalent to the test signal, to a non-nominal state, representative by an absence of the test signal.« less
 [1];  [2];  [3];  [1];  [4]
  1. (Stillwater, MN)
  2. (Montreal, CA)
  3. (Vadnais Heights, MN)
  4. (Saint-Luc, CA)
Issue Date:
OSTI Identifier:
3M Innovative Properties Company (Saint Paul, MN); Hydro-Quebec Corporation (Montreal) CHO
Patent Number(s):
US 6100702
Contract Number:
Research Org:
United States Advanced Battery Consortium, Dearborn, MI (US)
Country of Publication:
United States
in-situ; fault; detection; apparatus; method; encased; energy; storing; device; detecting; breach; electrically; insulating; surface; conductive; power; enclosure; series; connected; devices; disposed; connection; detector; coupled; detects; change; signal; derived; layer; nominal; non-nominal; voltage; signals; represented; selected; substantially; exceeds; opposing; alternatively; comprise; generator; produces; time-varying; modulated; injects; equivalent; representative; absence; storing device; detection apparatus; series connected; electrically insulating; electrically conductive; signal generator; insulating layer; fault detection; detector detects; energy storing; series connection; signal derived; substantially equivalent; storing devices; connected energy; insulating surface; power connection; /324/