I am doing a job and I have a 75KVA K factor transformer that is feeding a isolated ground panel. The transformer has H1, H2, and H3 for the line side and X1,X2, X3 X0 for the load side. I know how to hook the hot and neutral wires up on the line and the load side but I don?t know where to get the isolated ground from to feed my isolated ground panel. With my knowledge of isolated grounds I should be separate from any building steel. Another question. What is the diference between a K factor and a regular transformer.
Transformer
- Thread starter cousinles
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- Massachusetts
Your isolated ground conductor ideally starts at the XO along with the neutral.
It can not be truly isolated.
It can not be truly isolated.
- Location
- New Jersey
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- Journeyman Electrician (retired)
cousinles said:
No, this would eliminate any isolation that you would have at the panel. Run an IG ground from the XO to an isolated ground bar in the panel. This takes care of the IG, now bond the rest like a normal transformer secondary. Size this bonding jumper according to 250.66. This will terminate on your equipment grounding bar.
Dave58er
Senior Member
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- Dearborn, MI
K factor is the transformers ability to eliminate harmonics. if I remember right the rating goes from 0 to 30. 30 being the best at eliminating the harmonics, but you might want to check those numbers.
Transformer
A transformer's K-factor rating describes how well it can handle the additional heat generated by high harmonic content. You can find a definition of transformer K-factor in the ANSI/IEEE Standard C57.110-1986, Recommended Practice for Establishing Transformer Capability When Supplying Non-Sinusoidal Load Currents.
When dealing with K-factor, don't assume that more is better. Too much K-factor can reduce the transformer's ability to withstand power glitches. A higher K-rating means less impedance. You need a certain amount of impedance to handle surges and sags. It's not rare for a high-K-rated transformer's impedance to be under 3%.
A transformer's K-factor rating describes how well it can handle the additional heat generated by high harmonic content. You can find a definition of transformer K-factor in the ANSI/IEEE Standard C57.110-1986, Recommended Practice for Establishing Transformer Capability When Supplying Non-Sinusoidal Load Currents.
When dealing with K-factor, don't assume that more is better. Too much K-factor can reduce the transformer's ability to withstand power glitches. A higher K-rating means less impedance. You need a certain amount of impedance to handle surges and sags. It's not rare for a high-K-rated transformer's impedance to be under 3%.
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