I am considering putting a ground relaying scheme for a generator. Does the specification of the transformer play a role in the generator neutral current?
Any suggestion or reference is highly appreciated.
Definitely current carrying capacity of the transformer matters, if you are inserting it in neutral circuit of generator.
Generator neutral current would not be affected for the balanced loading of load, the transformer. In unbalanced condition(phase, amplitude or impedance of load) depending on rating of load(transformer) the return current(neutral current) needed to flow, or would be, depending on rating of transformer(specifications)....
If you mean the instrument current transformer, then its specification will affect the accuracy of the measurements of neutral currents. This is of special importance in protection, and monitoring. During abnormal conditions where the frequencies of the current may significantly deviate from the normal frequency. As a result, the transformer may act as a bandpass filter and prevents some currents to be detected.
My answer was similar to Mr Bhupendra Desai's. May be permissible tolerances in winding impedances of three phases and tolerances in magnetising current specified to restrict neutral current.
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