Question

Two persons are about to cut off power from an operational transformer. One suggests to
open the primary side (connected to grid) & the other person suggests to open the secondary
side (connected to household loads). Whose side are you on? Guide them choosing them the
correct way.

Answer 1

Given : Two persons are about to cut off power from an operational transformer. One suggests to  open the primary side (connected to grid) & the other person suggests to open the secondary  side (connected to household loads).

To Find : Whose side are you on?

Guide them choosing them the  correct way.

Solution :

primary side (connected to grid) should be opened

open the secondary  side (connected to household loads). is not suggested

As if secondary is opened and secondary is disconnected

then primary circuit has current flowing

and it can cause magnetizing the core due to ampere Turn  of primary

.

This may lead to voltage peaks

Hence primary side (connected to grid) should be opened

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