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Utility HV Tie-In

Utility HV Tie-In

Utility HV Tie-In

(OP)
We are designing a 138KV substation for our client at the early stage. We have considered H type, double bus bar, single bus bar, and ring system or even diret feeds from O/H line. two main transformers are used to transform to 35KV main distribution. We have reviewed different designs done by other companies and haven't decided which ones to be chosen.Any inputs would be very much appreciated.

RE: Utility HV Tie-In

Two lines and two transformers suggests a ring to me. At about 6 positions I'd go to breaker-and-a-half.

RE: Utility HV Tie-In

(OP)
Thanks, Guys.
Our plant main transformers are only 5km away from the local grid substation. The relibility should be reduced that much. That's why we are thinking of direct tap-off from 260KV o/h lines to the main transformer bushings. Definitely it is the least reliable way.But the cost is the least.By the way, we are going to use 260KV GIS. I believe even the Single bus bar config. should be very reliable.

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