voltage transformer
voltage transformer
(OP)
All voltage transformers what I've seen are single phase and then connected to three phase what you need (delta or wye). Is there some reason why not build three phase voltage transformer (using one core instead three)?






RE: voltage transformer
"The more the universe seems comprehensible, the more it also seems pointless." -- Steven Weinberg
RE: voltage transformer
RE: voltage transformer
I believe in the IEC world it is common to find a 3ø VT in one case {and maybe one core?}, where in the ANSI world, they are typically separate.
RE: voltage transformer
At high voltage, the single phase units are probably more practical from a physical standpoint anyway.
I'm hoping scottf will be along to enlighten us both.
"The more the universe seems comprehensible, the more it also seems pointless." -- Steven Weinberg
RE: voltage transformer
Bill
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"Why not the best?"
Jimmy Carter
RE: voltage transformer
There aren't many folks still making 3-phase VTs above 600V level currently. The main reason is that there is not much, if any cost savings in building a 3-phase unit for MV and HV applications. For applications up to 69 kV, single-phase dry-type units are much more affordable versus single-phase oil-filled and 3-phase oil-filled designs. The dry-type units are also generally smaller than oil-filled units and therefore space issues normally aren't a factor.
For applications over 69kV, oil-filled is the only option and 3-phase units start to become very difficult to build correctly, mainly because of the complicated insulation designed used in VTs. Manufacturing and processing become big challenges at this level and 3-phase options just don't make sense financially or logistically.