Answer / kundan malani

bcz the voltage measured in the line to ground and ground is
the reference's so that the PT Primary are the grounded.

Answer / p.k patel

voltage is measerd from line to grond and another reason if any fault occur at primary it will flow through the ground and equipment will protected

Answer / soumik biswas

We all know CT secondary should be grounded but why not PT secondary?

Answer / munish

PT is instrument and it is single phase T/F.it is working
on mutual induction.so it take neutral from ground.hence PT
primary is grounded.

Answer / o.p.arya

PT primary winding has delta connection and secondary in star
so delta winding how is possible to grounding always star
winding grounded to measure the voltage phase to phase &
phase to ground or neutral.

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