Feb. 21, 2022
The generator is the main device for converting mechanical energy into electrical energy. On the one hand, the generator is a rotating equipment, often in the running state, is the fault prone part. On the other hand, the generator is the main equipment to convert mechanical energy into electric energy, and the equipment failure directly affects the generation and transmission of electric energy.
The safe and stable operation of the generator set is directly related to the operation state of the thermal power plant, so it is necessary to strengthen the daily maintenance of the generator set, improve the operation performance, reduce the probability of failure.
At present, most thermal power plants in China have carried out preventive maintenance. Through preventive maintenance of generator set electrical equipment, problems can be found and solved in time.
For wear and tear parts in the process of use, it is necessary to replace them in time to eliminate potential safety hazards in advance and ensure the normal operation of the generator set.
However, with the continuous advancement of technological innovation, due to the immature technology, some defects will appear in the improvement process, which is easy to lead to sudden failure. Therefore, maintenance personnel are required to have high technical level, use rich practical experience and diagnostic equipment to determine the fault point, achieve rapid maintenance, and improve the operation efficiency of the generator set.
Reduce the effects of magnetic flux.
The core end plate of the generator set is equipped with a conductive shield to act as a magnetic deflector. And because most of the core end plates are stepped, this shape can increase the local reluctance, to achieve good heat dissipation effect. At the same time, the lamination in the cell is segmented, which increases the resistance and lengthens the eddy current path, thereby reducing eddy current losses.
In addition, the design of the core ends should be considered to minimize eddy current losses and maintain appropriate thermal and magnetic characteristics. Laminates should be made of low loss material and maintained under uniform pressure during production.
(2) Use demagnetization components to demagnetize the excitation coil.
For the rotor part of the generator, daily maintenance and overhaul should be strengthened. If the rotor is grounded, the fault should be eliminated in time.
The staff in the daily maintenance of the generator set, should often check the exciter, bearing bush to the ground insulation and tubing insulation; In addition, the motor assembly to be demagnetized can be placed in the excitation coil to increase the excitation current and reduce the current when the demagnetized assembly is lifted. When the current is zero, demagnetization is complete.
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