Common abnormal situations during generator operation (not to mention the main engine):
1. Actual current > 110% of rated current;
2. Actual current ≥ 110% of rated frequency;
3. Low tension. Actual voltage ≤ 95% of rated voltage;
4. The actual voltage ≥ 105% of the rated voltage;
5. The cooling water outlet temperature of the water-cooled generator is high
6. the water-cooled generator is weak.
This sentence applies to generators whose cooling method is water-hydrogen-hydrogen method, that is, water passes through the hollow conductor inside the stator winding and water carries away the heat generated during operation. of the generator to achieve the cooling effect. There are ventilation channels inside the stator core and rotor windings, which are cooled by hydrogen.
If the temperatureIf the internal cooling water of the generator stator winding is higher than the temperature of the hydrogen outside the winding, condensation will form on the outer surface of the stator winding, it i.e. the insulation surface. of the stator winding will become very wet, which will damage the insulation of the stator winding. As a result, the stator winding will be partially discharged and will no longer be able to function.