Answer Posted / 7anoter4
See:
http://www.onsemi.com/pub_link/Collateral/HBD855-D.PDF
and:
http://people.ee.duke.edu/~cec/final/node85.html
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What is the need of earthing transformer for delta side of a transformer. (Think of a line section between a star/delta transformer at a grid substation and delta/star transformer at a village. An earthing transformer is there at the delta side of the star/delta transformer at grid substation). As there are no ground reference there will not be fault current if a one phase is grounded. Further L-L phase will be sensed by the primary side of star/delta transformer as a L-G fault. So why an earthing transformer is required at delta side
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