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I am troubleshooting a 1967 GE synchronous motor used to run a reciprocating compressor. It is a 1000 HP machine. I am trying to figure out the size and purpose of the capacitor connected to the DC field. Is it there to absorb voltage fluctuations?

The capacitor has burnt up and can't be tested (arcing destroyed it)

Nameplate data:

KVA 800 Horsepower 1000 Volts 2300 Amp 200 RPM 225 cycles 60 Phase 3 PF 1.0

Excitation Volts 250 Amp 79

The capacitor has burnt up and can't be tested (arcing destroyed it)

Nameplate data:

KVA 800 Horsepower 1000 Volts 2300 Amp 200 RPM 225 cycles 60 Phase 3 PF 1.0

Excitation Volts 250 Amp 79