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NGT ( Neutral Grounding Transformers )

Rp. 123
Last Updated
31 Mar 2022
Minimum Order
1 UNIT
Category
Grounding

Specification of NGT ( Neutral Grounding Transformers )

NGT (Neutral Grounding Transformers)



Resistance grounding systems protect power transformers

and generators from damaging fault currents. Low

resistance grounding of the neutral limits the ground fault

current to a high level (typically 50 amps or more) in order

to operate protective fault clearing relays and current

transformers. These devices are then able to quickly clear

the fault, usually within a few seconds. The limited fault

current and fast response time also prevent over-heating

and mechanical stress on conductors.

If the system has a neutral which is available, a single

phase distribution transformer can be used in conjunction

with a loading resistor to provide high resistance

grounding. This is particularly well suited for grounding of

generators, in that it allows the system to operate like an

ungrounded system under normal conditions, while still

retaining the ability to limit ground fault current. The

primary of the transformer is connected from the system

neutral to ground. The loading resistor is connected

across the transformer secondary. The resistor is normally

sized to allow a primary ground fault current in the range

of 2 to 12 amps and is typically rated for either one minute

or continuous duty. The transformer should be sized

accordingly, with a primary rating equal to the system line

to neutral voltage and the secondary normally rated 240 or 120 volts.

When a ground fault occurs downstream of the grounding transformer, ground fault current flows through

the fault and back through ground to the grounding transformer. The loading resistor limits the current

flow in the secondary winding, which in turn limits the flow of the ground fault current back into the system

through the primary of the grounding transformer.

Post Glover’s GT product line is designed for applications on systems up to 15kV. Secondary voltage is

typically 240 volts, and resistors are designed according to customer specification. Typical construction is

a dry type transformer with a secondary resistor mounted in a common enclosure..


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