Static Exciter Field Breaker Voltage and Current

[nuckythompson]

See video at link above showing voltage and current for static exciter field breaker during generator start up. Can anyone explain what is happening? Current on left, voltage on the right.

Thanks,

 

[petersonra]

I think the first blip is flashing the field. Then when the generator gets up to speed it turns the field on normally.

 

[paulengr]

During starting the generator acts as a rotary transformer, inducing huge AC voltages onto the rotor. I’ve seen 10 kV or more easy. Shorting the leads keeps the voltage down (to stall). This is what the D,c chddOnce it is up to speed control can transfer to the DC power supplies and