dry motor

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puckman said:
when drying out 3 phase motor that has been under water it is said to apply low voltage to the winding . does anyone know how this done. thanks
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You can use a welder set to amperage less than the rating of the motor. Dependeing on the size of the motor, it can take anywhere from a few hours to a few days. We did a 2500 hp 4160 motor that had became wet from a problem with the building. It took two days of drying via/a welder, and blowers. And megging every 4 hrs before we could start it.
 
mcclary's electrical said:
You can use a welder set to amperage less than the rating of the motor. Dependeing on the size of the motor, it can take anywhere from a few hours to a few days. We did a 2500 hp 4160 motor that had became wet from a problem with the building. It took two days of drying via/a welder, and blowers. And megging every 4 hrs before we could start it.
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Yep, arc welder. In extreme cases you can also lease a dehumidifier/blower setup to pull and return air through the motor. We had to do this with a 21MW generator that sat for two months with no heaters in a humid environment.
 
I have also used a heavy duty battery charger with adjustable output successfully. 'Would be cautious about using a meggar or Hi-Pot on it until it had been on the welder or charger long enough to have been warm to the touch for several days.
 
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