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Boiler Circulating Pump Electromotor
Boiler Circulating Pump electromotor Drive- Power plant

Regarding Boiler Circulating pump Electromotor Drive, in a steam power plant 320 MW, questions as follows:

3 Phase electromotor, 380 V. 1470rpm, 4 Pole, 1090 A, 50Hz
Power = 550Kw
2365 m3/h
head = 61.5 m

The electromotor drive stator consist of two parallel delta windings. I don't know why?

Unfortunately, OEM Manual is not available.