Frequency-selective circuit protection arrangements
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United States of America Patent
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-
Aug 20, 2002
Grant Date -
N/A
app pub date -
Mar 28, 2000
filing date -
Sep 14, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A conventional ground fault circuit interrupter (GFCI) is modified to provide frequency-selective current protection. A control element is connected in series with the line path (or return path) of the GFCI, and a bypass element is connected in parallel with the combination of the control element and the line path (or return path) of the GFCI. Under normal conditions, little or no current flows through the bypass element. However, frequency response characteristics of the control and/or bypass elements are such that a frequency-selective component of the current (i.e. high-pass, low-pass or band-pass) is diverted through the bypass element. When the magnitude of the frequency-selective component reaches a predetermined value, the bypass current flow causes sensing of a resulting current imbalance and tripping of the GFCI.
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