Wiring of the transformer group of the generator of a certain unit

1. The current in phase A is too large and phase BC is too small, indicating that phase A is a faulty phase

2 There are reverse current and zero sequence current, indicating that. there is a ground fault

3. The air temperature at the generator output increases, indicating that the point of short circuit to ground is at the generator output.

The result is: phase A ground fault. the generator output.

Then it is necessary to reduce the load, then stop the machine, check the fault status of phase A during power failure and carry out maintenance.