Earth Fault

The range of products for earth fault monitoring covers both grounded and ungrounded systems.

And both Restricted and Unrestricted earth fault protection. The difference between restricted and unrestricted earth fault is the location of the neutral grounding point (PE). When combined with a suitable Core Balanced Current Transformer the KPM162x/362x/363x or the KCM162x/362x/363x can be used in either application.

Unrestricted network can be TN-S, TN-C, TN-C-S or TT Network. Please see the datasheet for further details.

They can also be used in IT networks but since that is a ungrounded system a impedance module is needed to detect the first earth fault location and value.

A wide range of C.B.C.T can be used together with the earth fault instruments, both circular and rectangle types.

For Earth Fault Protection there is the neutral displacement guard, the "Open Delta" guard and the generator stator guard.

The neutral displacement guard measure the voltage level between the neutral point and PE. And on any phase fault the neutral displacement is detected, and unit will trip the power.

The Open Delta guard is similar but measure the neutral displacement via a step-down open delta transformer.

The generator stator protection uses 2 sets of current transformers in a Merz-Price configuration.

This unit protects against phase-earth and windings faults within the generator stator area.