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" Euro " electrician
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5,369 Posts
can we connect metal bar instead of NGR in transformer neutral point
Before I can commet more what type of transfomer and what the voltage you are running on this one ??

Is this single phase or three phase transfomer or what ??

Merci,
Marc
 

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" Euro " electrician
Joined
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5,369 Posts
Whats an NGR?
Jbfan.,

I think but to be on safe side I am thinking the OP refering to the secondary connection on the transfomer due I did ask the OP more question on that.

I feel it is EGC.

Merci,
Marc
 

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Idiot Emeritus
Joined
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1,910 Posts
Whats an NGR?
Most likely Neutral Ground Resistor.

Fairly common in wye connected 3ø systems where a solidly connected neutral to ground bond would cause equipment damage or even be a safety hazard during a ground fault.

The purpose of the resistor is to limit fault current to the point it doesn't blow stuff up before a breaker can trip.

Usually these are on systems with long feeders where a ground fault might not cause the magnetic trip of a breaker to clear the fault. It sits there and burns until the thermal part trips it.

A phase to phase fault, since the voltage is higher, will trip the breaker instantly.

Generally speaking, it's not a good idea to just bond the neutral to the ground where there was a resistor. A fault current study would be in order before making any changes.

If NGR means something else, then just ignore my post.

Lol.
 
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