Answer / guest

let us consider a coil having N turns and is subjeected to flux @=@msinwt
so by faradays law of electromagnetic induction an emf is indused in the coil e=-nd@/dt
e= -n d(@msinwt)/dt

Answer / simon

E=4.44 Phie m.fq.N

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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