| Alan Sledzieski wrote on Thu, 05 August 2010 16:16 |
Rob Spence
Distribution, normally up to 15kv, some use 23 for distribution and very few 34.5, Sub transmission is 23 kv to 69 kv. Transmission starts at 115 kv, 230 kv, 345 kv and up.
99 % of the sub transmission and transmission is delta, no neutral. At the substation when it is stepped down to 4160 13.2 kv, 13.9, the transformers are wire delta on the high side, grounded y on the low side. This is what feeds the residential feeders. Grounded y primary uses 1 phase of primary and a neutral. They use grounded systems now for the safety of the grounded y sysetem and fast action of the station breaker. We never build anything delta any more, and we are constantlly converting delta primary to Y, thats is for residential distribution.
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Yes, I know. I said that too.
My view of HV as discussed here is as you said, Delta. No neutral.
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Topic: Breaker on the neutral line??? (Read 5499 times)