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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Answer Posted / Naveen Sharma
An earthing transformer on the delta side of a transformer serves to minimize the ground potential rise (GPR) and reduce the ground leakage current. Even though a single phase-to-ground fault might not cause a fault current if there are no ground references, the ground leakage current can still affect the operation of protective devices and cause equipment damage. The earthing transformer helps in maintaining a stable ground potential and preventing excessive leakage currents.
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