Looking at the unit generator above. We have an external fault on the grid.

Assuming:

CT by the generator is $6000/5,$

CT next to the grid connection is $600/5,$

CT next to the Unit Aux. Xfmr is $6000/5.$

The $87$ TG is set to $25\%$ slope with a pick up of $0\mathrm{.}5$A$.$

No fault current is flowing to the auxiliary bus to simplify calculations.

We measure the fault current coming out of the generator to be $47\mathrm{.}4$kA$.$

How much current is flowing through the operating coil of the $87$TG relay?Looking at the unit generator above. We have an external fault on the grid.

Assuming:

CT by the generator is $6000/5,$

CT next to the grid connection is $600/5,$

CT next to the Unit Aux. Xfmr is $6000/5.$

The $87$ TG is set to $25\%$ slope with a pick up of $0\mathrm{.}5$A$.$

No fault current is flowing to the auxiliary bus to simplify calculations.

We measure the fault current coming out of the generator to be $47\mathrm{.}4$kA$.$

How much current is flowing through the operating coil of the $87$TG relay?