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Neutral bushing insulation level for a solidly grounded 400/132/20 kv Ynyn0d11

Neutral bushing insulation level for a solidly grounded 400/132/20 kv Ynyn0d11

Neutral bushing insulation level for a solidly grounded 400/132/20 kv Ynyn0d11

(OP)
I would like to know how can I size the insulation level for both primary and secondary neutral bushings of a solidly grounded 400/132/20 KV Ynyn0d11 power transformer.

Regards
Massoud

RE: Neutral bushing insulation level for a solidly grounded 400/132/20 kv Ynyn0d11

I guess you find out information at IEC 60076-3 part 3 - insulation coordination, at requirements of coordination for neutral terminal of transformer.

RE: Neutral bushing insulation level for a solidly grounded 400/132/20 kv Ynyn0d11

Massoud,
for similar units in terms of nominal voltages (i.e. 400/135 kV autotransformsers), operating in an effectively neutral grounded system, we specify 72.5 kV for neutral bushings. Obviously we are speaking about non-uniformly insulated windings.

Si duri puer ingeni videtur,
preconem facias vel architectum.

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