What should we pay attention to when the generator is overloaded?

Introduction What should we pay attention to when the generator is overloaded? 1. In the event of an accident, the generator and exciter are allowed to operate with accident overload for a short period of time. The allowable current and time of the accident overload a

What should we pay attention to when the generator is overloaded?

1. In the event of an accident, the generator and exciter are allowed to run overloaded for a short period of time. The allowable current and time regulations for accidental overloading are used. When the generator is running overloaded due to an accident, the inlet and outlet wind of the generator should be closely monitored, and the wind inlet and outlet of the generator should be closely monitored. The rotor coil temperature, stator and rotor coil outlet water temperature, and brush operation conditions must not exceed the maximum value. When the stator current of the generator exceeds the allowable value, the electrical on-duty personnel should first check the power factor and voltage of the generator, and pay attention to calculating the multiple and duration of the current exceeding the rated value, reduce the rotor current, and reduce the stator current to the maximum allowable value. However, the power factor must not be too high and the voltage must not be too low. If reducing the rotor current cannot reduce the stator current to the allowable value, contact the dispatcher to reduce the active load of the generator.

2. When the rotor of a running generator is grounded at one point, the excitation system should be cleaned and inspected. If it is a stable metal grounding, the machine should be shut down immediately. If the cause is not found, the monitoring should be strengthened and the machine should be shut down for processing. When the generator excitation system is grounded at one point, be careful to prevent artificially caused two-point ground faults.

3. When condensation drops (that is, condensation) appear on the generator stator coil or air cooler, Then the inlet air temperature of the generator should be increased to eliminate condensation.

4. When the air cooler leaks, a group of leaking coolers should be deactivated and ground water should be eliminated. At this time, the generator The temperature difference between the two ends of the inlet air does not exceed 3 degrees.

5. When strong annular sparks occur on the surface of the slip ring of the generator or the commutator of the exciter, the slip ring will change color and the surface of the commutator will be burned. When black, the cause should be cleared immediately and the cause should be identified to quickly eliminate sparks and overheating. If it is ineffective, immediately reduce the excitation current or even reduce the active load to reduce the spark overheating to the allowable regulations. If it is still ineffective, shut down the machine.

6. When the generator sends a differential protection disconnection signal, the differential protection of the generator should be deactivated immediately, the stator current should be reduced as much as possible, and the cause of the secondary circuit of the differential converter of the generator should be checked. If the cause cannot be found, stop the machine for inspection.

7. When the automatic cabinet fails, it should be repaired in time and put into operation. The generator is not allowed to run for a long time under the adjustment of the manual cabinet. When the manual cabinet is running, When adjusting the active power of the generator, you must first adjust the reactive power appropriately to prevent the generator from losing static stability.

8. When a short circuit occurs directly at the generator outlet, the stator coil should be carefully inspected. If it is found that the stator coil is deformed, the binding wires are loose, the pads are falling off, water is leaking and other abnormal phenomena should be stopped for inspection.

9. When the generator smokes or fires, remove the Except for the generator fire handling regulations, the cooling water system should continue to operate and the water supply should not be stopped until the fire is completely extinguished.

10. A long-term short circuit occurs outside the generator-transformer unit switch, and the pointer of the stator ammeter When pointing to the maximum and the voltage drops sharply, if the protection device refuses to operate, the generator-transformer assembly should be manually disassembled immediately.List.

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