Purpose of Fuse in Potential Transformer—Why Is It Used and How Does It Protect PTs?

What is the use of the fuse in potential transformer ?

isn't it to protect against failure of the transformer or to draw too much current during a fault condition from the secondary.

It may be voltage that you want but isn't it to protect against load failure

it is a general rule that fuses should be used both for primary winding protection and secondary winding protection of a PT. This is to protection the PT from high currents due to circuit faults and to protect the circuit from faults that may occur in the PT or the secondary circuit attached to a PT.

Primary fuses must be selected so they will interrupt the max short circuit current and not blow for inrush magnetizing current to the transformer which occurs during switching. Ask the manufacturer for short circuit current info on PT primary and secondary terminals.

Secondary fuses must also be used because faults on the secondary side my not always blow the fuse on the primary circuit... so a secondary fuse must be used.

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