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ge:heaters [2022/04/14 05:55] – [Generator Heater Design] Alan Shea | ge:heaters [2023/10/17 22:26] – [Generator Heater Design] Alan Shea | ||
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To prevent this, the generator windings need to be kept slightly warmer than the ambient temperature. | To prevent this, the generator windings need to be kept slightly warmer than the ambient temperature. | ||
- | New windings should have over 500 Meg-ohms from any winding to the frame. This must be measured with a meg-ohmmeter using 500VDC. | + | New windings should have over 500 Meg-ohms from any winding to the frame. This should |
- | Used generator windings may be between 50-100 Meg-ohms. If the measured | + | <WRAP center round alert 60%> |
+ | **// | ||
+ | </ | ||
- | Factory-supplied anti-condensation heaters operate at approximately 110C+ but are mounted on a bracket in front of the exciter. They depend on the heat conduction through the bracket to the generator frame. This does not seem to keep the actual windings warm enough to prevent moisture | + | Used generator windings may be between 50-100 Meg-ohms. If the measured insulation resistance is below 5 Meg-ohms, the generator should be taken out of service and the windings dried by a suitable method. The generator manufacturer can best advise on this. ((See // |
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+ | <WRAP center round alert 60%> | ||
+ | **// | ||
+ | </ | ||
+ | |||
+ | Factory-supplied anti-condensation heaters operate at approximately 110C+ but are often mounted on a bracket in front of the exciter. They depend on the heat conduction through the bracket to the generator frame. This does not seem to keep the actual windings warm enough to prevent moisture | ||
We had tried using regulated heat tape, but the heat output decreases with temperature, | We had tried using regulated heat tape, but the heat output decreases with temperature, | ||
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Top of generator frame is comfortably warm 12 hours after shutdown. This is ideal. | Top of generator frame is comfortably warm 12 hours after shutdown. This is ideal. | ||
- | * Top of generator | + | * Top of generator |
- | * Bottom of generator | + | * Bottom of generator |
- | * Heater | + | * Heater |
Ideal mounting position would be in the center of the bracket so that less heat is conducted to the mounting frame. | Ideal mounting position would be in the center of the bracket so that less heat is conducted to the mounting frame. | ||
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