AC power line protection using thyristors
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United States of America Patent
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Feb 19, 2008
Grant Date -
N/A
app pub date -
Apr 23, 2003
filing date -
Apr 23, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A transient suppressor circuit for use in suppressing transient voltages superimposed on AC power conductors. The transient suppressor circuit includes a threshold thyristor connected in series with a capacitor. The transient suppressor circuit is connected across the AC power conductors. In response to a transient voltage superimposed on the AC power conductors, the thyristor is triggered into conduction. The series capacitor has a capacitance such that it represents a low impedance to the transient voltage, but a high impedance to the AC power line frequency. Accordingly, the triggering of the thyristor shunts high frequency transient currents to ground via the low impedance of the capacitor, but does not shunt low frequency AC power currents to ground because of the high capacitive impedance. Circuit fuses are thus not blown in response to low frequency overvoltages.
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