Ground monitor circuit protection apparatus
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United States of America Patent
Stats
-
Oct 27, 2015
Grant Date -
Jun 26, 2014
app pub date -
May 31, 2013
filing date -
Dec 20, 2012
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An apparatus includes a resistor assembly with resistors connected in series between a first terminal and a second terminal of a pilot conductor and/or a ground return of a ground monitor. The pilot conductor injects an electrical signal in a ground of a power cable assembly. A zener diode assembly is connected between a zener connection point and the ground return. The zener connection point is the first or second terminal. The zener diode assembly includes zener diodes connected in series between the zener connection point and the ground return and is sized to clamp a voltage from the zener connection point to the ground return to a value less than a zener threshold voltage. The zener threshold voltage is set above a nominal voltage on the pilot conductor. The components of the apparatus are spaced to prevent an arcing fault current for voltages less than 3000 V.
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