Ground Current

Description

The ground current is an imbalanced current flowing through the neutral of the three-phase system. In normal conditions, the ground current is negligible or null. It is present only when a ground-fault occurs.

The ground current is:

Calculated internally by the LTMTCT/LTMTCTV sensor module from the measured phase currents.
Measured by an external ground current transformer connected either to the LTMTCT••T/LTMTCTV••T horizontal sensor module.

NOTE: Calculated ground current is not available in single-phase mode.

Calculated Ground Current

The ground current is calculated internally by the LTMTCT/LTMTCTV sensor modules and is equal to the vector sum of three-phase current values.

Characteristic	Value
Unit	Ampere (A)
Resolution	0.001 A
Refresh interval	100 ms

Measured Ground Current

The measured ground current is more accurate than the calculated ground current.

The ground current can be measured using an external ground current transformer.

Characteristic	Value
Unit	Ampere (A)
Resolution	0.001 A
Refresh interval	100 ms

NOTE: 0.003-30 A ground current can be measured by the terminal.