|Ground Fault / Earth Leakage Sensors
| Ground Fault
AG Series sensors from NK Technologies protect
people, products and processes from ground faults by monitoring all
current-carrying wires in grounded single or 3-phase systems.
Principle: Under normal conditions, the current in the hot leg of a two-wire
load is equal in strength but opposite in sign to the current in the neutral
leg. These two currents create magnetic fields that are also equal but
opposite. When conditions are normal, the fields cancel, producing a "Zero Sum
Current". If any current leaks to ground from one wire (Ground Fault), the two
currents become imbalanced and the result is a net magnetic flux or field. AG
Series ground fault sensors monitor this field and alarm when leakage rises
above setpoint. This concept applies to grounded 3-phase delta and wye systems.