Judge by checking whether the battery voltage is sufficient. If the battery maintains sufficient power for a long time, it means that the generator has normal operating performance; turn on the ignition and do not start the car, use metal; tools to approach the generator pulley. Normally there should be an obvious magnetic attraction. After finding the car, use a multimeter to test the generator output voltage. When the throttle is applied, the voltage will increase and reach a maximum of approximately 14.5 V. indicating that the generator is generating power normally.
1. Look at the label and the appearance of the generator. Look at which factory it was produced in, when it left the factory and how long ago; look to see if the paint on the exterior is peeling or damaged, if the model has been disposed of, etc. Determine how new or old (quality) the generator isfrom its nameplate and appearance.
2. Perform a test.
3. Ask about the time of purchase, the purpose and reason for selling the generator, find out about past repairs, what major components were replaced and ask about any problems during use, so to have a more complete vision. understanding the generator. Generator status (good or bad)
4. Connect the positive test lead of the multimeter to the armature terminal of the generator and the negative test lead to the iron. The generator armature terminal voltage. the 12V generator should be 13.5~14.5V, the armature terminal voltage of the 24V generator should fluctuate between 27V and 29V. If the voltage indicated by the multimeter is close to the value of voltage of the car battery and the pointer does not move, it means that the generator is not producing electricity.
Why the generator must be equipped with a rair cooler?
Water pipes are usually made of copper pipes with a diameter of 20 mm and a thickness of 2 mm. Each group has two water chambers on both sides for water supply and return. The stator coil and iron core of the generator as well as the rotor coil and iron core are distributed. The heat is blown by the axial flow fan over the generator rotor to the air cooler and is then drawn into the rotor-stator. -air cooler through both ends of the generator to form a loop. However, this has nothing to do with the electrical circuit unless an air cooler leak causes generator isolation.
condensation damage. in the air cooler of the hydroturbine generator?
When the generator is running, it will generate heat! An air cooler is required for cooling!
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The generator air cooler in our factory is not very efficient. Is there a way to fix this?
1. The stator temperature is too high and damages the generator insulation. The insulation temperature level is divided into several groups. Hydrogenerators are generally Class F and national standards allow a temperature increase of 105 degrees. If the temperature is too high, it will damage the insulation and shorten the life of the motor. Of course, this can also burn the stator coil directly.
2. The risks associated with excessive rotor temperature are the same as those in the first point.
3. Ifthe pad material is bus alloy, the national standard cannot exceed 75 degrees, and the plastic tile is 55 degrees. If it is too high, the pad will be burned and it will no longer be able to function. In actual operation, bus alloys typically operate between 40 and 60 degrees. plastic tiles in operate below 50 degrees.
4. Installing an air cooler involves cooling the stator and rotor. Water circulates through the air cooler to cool the air inside the generator to achieve cooling.
Who knows how to deal with the reduction of stator and rotor insulation after generator maintenance?
Possible reasons and solutions for poor air cooler performance:
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1. Cooling water pressure is low: increase water pressure.
2. The cooling water pipe is clogged with foreign matter - clean it andclean it.
3. The cooling water temperature is high: this is the most common problem in summer. You may consider using deep well water.
4. The air cooling chamber has a poor seal --- leak.
In addition, you can observe the temperature difference between inlet and outlet water and analyze the cooling effect of the chiller. If the efficiency has reached the standard, it is not a design problem.
Answer: In one case, due to the long maintenance period of the generator, the insulation of the generator stator and rotor may be reduced before starting. In the other case, the internal failure of the generator. Generator may occur due to external reasons. Getting wet from water. Generators with class B or higher insulation are made from thermosetting materials, so under normal circumstances the surface becomeswet dra. In cases of mild moisture, insulation can usually be restored by idling the engine for a few hours. When starting and idling, be sure to turn off the cooling water to the unit's air cooler and open a number of ventilation holes on the top cover of the generator, if applicable. In severe cases of humidity, drying by current or an external heat source should be used. For large units, when the rotor is still partially insulated, three-phase short circuit drying is the simplest method. ⑴Three-phase short circuit drying method. 1) Three-phase short-circuit drying requires that the generator itself has operating conditions, that the rotor can use backup excitation (generators with coaxial exciters do not have this restriction), and that the measurement points temperature of each part of the stator are inspected nnormally. Install a three-phase short-circuit busbar on the generator output bus. The section of the busbar is considered according to the nominal current of the generator. Good contact must be ensured when connecting to the busbar. During a short circuit test of a generator in a power plant, the paint on the connection surface was not removed, which caused the contact part of the busbar to burn soon after the start of the test. Fortunately, this was discovered in time and no serious consequences were caused. 2) If the generator has a series transformer for neutral point side excitation (self-feedback excitation system), the series transformer must be short-circuited using a short-circuiting busbar , otherwise the transformer may burn due to long-term current flow. . Likewise, the arc suppression coil or grounding transformer at the neutral pointmust be removed.