Reliable detection of high impedance earth faults on MV networks continues to be a major challenge on distribution networks worldwide. Conductors down on high resistance surfaces present person safety risk issues and increasingly, an elevated risk of wildfire ignition.

Applied IQ provides a reliable solution for the detection of such earth faults. It works satisfactorily regardless of the system neutral treatment in use, for both 3-wire and 4-wire construction and for any load connection (three phase, phase-phase and phase-neutral).

Using this system sensitivity of at least 5-10 kΩ, can be achieved.