Four wire system
Four wire system
(OP)
Hi all,
In North America I saw four wire Transmission/distribution system for upto 27.6kV system.
What is main purpose of neutral in such high voltage as all loads are three phase only in this voltage range.
Thanks in advance for reply.
In North America I saw four wire Transmission/distribution system for upto 27.6kV system.
What is main purpose of neutral in such high voltage as all loads are three phase only in this voltage range.
Thanks in advance for reply.






RE: Four wire system
RE: Four wire system
Transmission systems don't need neutrals because they serve three phase load or substations with delta grd-wye transformers. Some utilities have used 34.5 kV as a subtransmission feed to stepdown stations to 12.5 or 13.2 kV. The 34.5 kV feed is often supplied without a neutral.
If it's functional a transmission circuit, it won't typically have a neutral. If it is a distribution circuit, I'd guess more than 85% of them will be 4-wire.
RE: Four wire system
RE: Four wire system
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If we learn from our mistakes I'm getting a great education!
RE: Four wire system
Or, one lightning arrester, one fused disconnect switch and a transformer voltage rating about 58% of line to line voltages.
Also the neutral conductor works well with the multiple ground points common on our distribution systems.
Bill
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"Why not the best?"
Jimmy Carter
RE: Four wire system
RE: Four wire system
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If we learn from our mistakes I'm getting a great education!