33kV System earthing
33kV System earthing
(OP)
Which is most common - Solid (or effective) earthing or Resistive earthing.
Thanks in anticipation.
Thanks in anticipation.
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RE: 33kV System earthing
RE: 33kV System earthing
IEEE141 indicates Resistance earthing is common for 5-15kV systems. I don't think this applies to system with overhead line distribution circuits.
RE: 33kV System earthing
Here in the uk the 33kv system is usually fed from 132/33kv Wye / delta transformers. This leaves the 33kv side un-earthed so a second transformer is introduced with a zig-zag primary whose star point is resistively earthed, an auxillary winding within the "earthing transformer" is used to feed sub-station house supplies etc.
The resistance value is usually set to allow a max earth fault current of 1000-1500 amps.
RE: 33kV System earthing
RE: 33kV System earthing
isquaredr,
Could you tell me whether the overhead line distribution at 33kV is common in UK or the arrangement you described is for cable distribution.
Thanks once again.
RE: 33kV System earthing