Neutral resistance usage
Neutral resistance usage
(OP)
Dear All,
Consider 2 generator . These generators are 6.3 kV and They are connected to 34.5 kV system with power transformer ( delta(6.3 kV )/star (34.5 kV) ( Dyn11).
In some application, I see that each transformer neutral point are earted with a resistor independantly.(Aplication1)
But some other application , Two transformer neutral point are connected in a point. Only one resistor is used for two transformer. (Application 2 )
What is the advantages and disadvantages of both
Application 1 and Application 2.
With my best regards
Consider 2 generator . These generators are 6.3 kV and They are connected to 34.5 kV system with power transformer ( delta(6.3 kV )/star (34.5 kV) ( Dyn11).
In some application, I see that each transformer neutral point are earted with a resistor independantly.(Aplication1)
But some other application , Two transformer neutral point are connected in a point. Only one resistor is used for two transformer. (Application 2 )
What is the advantages and disadvantages of both
Application 1 and Application 2.
With my best regards






RE: Neutral resistance usage
Application 2: These two transofrmers are feeding one system.
RE: Neutral resistance usage
Regards
Marmite
RE: Neutral resistance usage
Totally agree with Marmite.
Regards.
Slava
RE: Neutral resistance usage
Grounding the system neutral with one resistor makes ground fault detection and protection easier.
This is in accordance with the oft stated principal of a single grounding point or connection between the neutral and ground.
If you have system ground fault protection you may wish to consider a single point ground connection.
If each transformer has extensive protection, including ground fault protection, you may wish to use an independant resistor for each transformer.
If the transformer neutrals are floating, then by all means use a resistor for each transformer.
If the transformer neutrals are solidly connected, you may consider a single resistor.
Bill
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