VT Earthing
VT Earthing
(OP)
Please kindly explain the difference between "Y pahse earthing in and "N earthing in VT secondary winding. (Voltage level is 33kV or above).
Regards
HMDJRG
Regards
HMDJRG
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RE: VT Earthing
Bill
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"Why not the best?"
Jimmy Carter
RE: VT Earthing
While it is standard practice to earth the star point, in some cases, specifically in case of unit connected generators, it is preferred to earth the Y-phase rather than the Star point.
The advantage with this is that the earth fault protection in the generator system can be set without any fear of it maloperating for a phase-to-ground fault in VT secondary circuits.
IEEE C57.13.3 Grounding of Instrument Transformer Secondary Circuits is a good reference.
RE: VT Earthing
RE: VT Earthing
RE: VT Earthing
One color scheme for all voltage levels? Sounds like a prescription for trouble.
RE: VT Earthing
Incidentally I pickedup the "Y-phase" from the referred IEEE.
It is true too many naming conventions! A-B-C, 1-2-3 and R-S-T that you mentioned I can add u-v-w (IEC countries!!).