Transformers
- Thread starter Johanm3
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winnie
Senior Member
- Location
- Springfield, MA, USA
- Occupation
- Electric motor research
Transformer KVA is determined by the connected load. So do a load calculation.
If you are keeping the same loads, and the present transformer is not overloaded, then a transformer with the same KVA rating should be sufficient.
If you want to switch to a wye connected secondary simply for grounding reasons, and not to add any neutral load, then you might consider using some sort of grounding transformer, eg. a 'zig-zag' transformer, which you _add_ to your current setup to derive a neutral for grounding purposes.
6.6 KVA seems a strange number for a transformer rating.
-Jon
If you are keeping the same loads, and the present transformer is not overloaded, then a transformer with the same KVA rating should be sufficient.
If you want to switch to a wye connected secondary simply for grounding reasons, and not to add any neutral load, then you might consider using some sort of grounding transformer, eg. a 'zig-zag' transformer, which you _add_ to your current setup to derive a neutral for grounding purposes.
6.6 KVA seems a strange number for a transformer rating.
-Jon
charlie
Senior Member
- Location
- Indianapolis
It may not be strange if he is not from the USA, he did not include his zip code in his profile.winnie said:
Preacher1a
Member
- Location
- Houston, Texas
Transformer Ratings
Transformer Ratings
6.6KV to 550 Volts sounds like a drilling rig application to me (575Volts here in the States). I do a lot of work in refineries and chemicals plants and have noticed a distinct change from the ungrounded delta or grounded B phase configurations that industrials use to keep their plants up and running, even when there is a fault on the line. The move is toward high resistance grounding systems, which would require the neutral connection. Unless the transformer is old or experiencing problems, the solution of adding the zig-zag transformer is an excellent one.
Transformer Ratings
6.6KV to 550 Volts sounds like a drilling rig application to me (575Volts here in the States). I do a lot of work in refineries and chemicals plants and have noticed a distinct change from the ungrounded delta or grounded B phase configurations that industrials use to keep their plants up and running, even when there is a fault on the line. The move is toward high resistance grounding systems, which would require the neutral connection. Unless the transformer is old or experiencing problems, the solution of adding the zig-zag transformer is an excellent one.
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