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Why earthing transformer used in Distribution Sub-Station?
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Answer Posted / engr. l. o. osuji
Hi questioner,
Earthing T/F or T/Fs are not required in distubution S/S.
For example, here in Nigeria the distribution volage for
the T/F is either 11/0.415kV or 33/0.415kV detla-star.
However, in Transmission S/S where there are 132/33kV star-
delta connected T/F or T/Fs earthing T/F or T/Fs are
necessary. The earthing T/F is connected on the 33kV side
of the main T/F while the star-point of earhing T/F is
connected to ground to provide an artificial star-point for
the main T/F. This so because 33kV distribution ground-
fault current must flow back to the main T/F. Earth fault
protection for the main T/F must sense this current and
isolate the main T/F otherwise the earthing T/F will roast
i.e. burn.
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