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How to deal with the generator
Update:2018-11-26 18:30 Tags:
The processing method: after be affected with damp be affected with damp
After generator be affected with damp be affected with damp, must carry on the drying processing in a timely manner, depending on the size of generator capacity and the degree of be affected with damp be affected with damp, generally has the following several commonly used methods.
1. The oven roasted (furnace) method on conditional place, the generator overall unwrapped the stator and rotor (best) on the heats up baking oven (furnace). Oven (furnace) should be ventilated, so as to take away moisture, and is the best sandwich layer to put the generator, the outer heating. The inner temperature in 90 ~ 100 ℃, and cannot open flames and smoke, and other flammable and corrosive gas. Bake for 8 to 12 h, general requirements for middle can measure the insulation resistance value several times, in order to achieve the specified value and stable.
2. Steady short circuit current method after alternator be affected with damp be affected with damp, three-phase short around the outlet box, and then make the generator speed up to the rated speed, remains the same, then adjust the excitation current, first make the stator short-circuit current reached 50% ~ 70% of rated current, keep in 4 ~ 5 h, then increase the excitation current, the short circuit current rating of 80% ~ 100%, and to keep the temperature of the coil under 85 ℃, 30 min every measuring insulation resistance and the temperature of a coil, until the rise and insulation resistance stability.
Note: steady short circuit current method is not applicable to the generator terminal voltage cannot be transferred to the zero value of automatically regulating generators.
Ac coil under the hot insulation resistance shall be not less than the calculated value of type R rated voltage or UN (V)/(1000 + rated capacity (KV A) / 100) material UN / 1000 (M Ω) at the same time, the dc magnetic field coil insulation resistance with A 500 V megohmmeter determination, should not be less than 1 M Ω.
For dc generator, can take it into his field winding on the low voltage dc voltage is 2 ~ 4 v, make produce less exciting current, and the armature winding through the ammeter automatic short circuit and through certain current (not more than current rating), generator for baking, note: generator inlet temperature is not greater than 85 ℃, and often measuring insulation resistance, for inspection.
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