The GADP ground fault alarm unit with its built in pulsing capability, paired with the OHMNI-PM resistor, is ideal for resistance grounded power systems where indication of the severity of the fault, indication of the faulted phase and the capability to locate the fault is required.
The GADP relay works on the principle of a change in line-to-ground voltage that occurs when a fault appears on one of the lines of a high resistance grounded system. For the purpose of measurement a resistor divider, I-GARD Type DDR2 is used which provides a proportional low voltage signal to the relay to indicate which phase is faulted and the fault level as a percentage of the maximum fault level of 100% (representing a complete short to ground on one phase).

Alarm on first fault at 50% of fault current

Phase and fault magnitude indication

built in pulsing capability

Available for 120V, 240V, 240V, 480V and 600V systems