Neutral Grounding Reactor

NEUTRAL GROUNDING REACTOR (NGR)

The Neutral Grounding Reactor is a single phase
reactor in three phase power system, connected
between the neutral and earth of transformer to
limit the fault current. Neutral Earthing reactors
are also used for reducing momentary over
voltages during breaking of instantaneous fault
current.

Under normal system conditions, the voltage
across a neutral-earthing reactor is small and
consequently, the current through the reactor is
small. During system fault, the current will
increase considerably, and its duration in Seconds
needs to be specified.
The insulation requirements of NGR shall correspond to the insulation of the neutral of the power system or the shunt reactor in which the reactor is to be installed. For the earth terminal, the selection of a reduced insulation level may be appropriate (non-uniform insulation).



























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