Generator loss of excitation is the disappearance of generator remanence. Remanence refers to the magnetic field retained by ferromagnetic materials when the external magnetic field disappears in the process of magnetization. Generator remanence refers to the remanence of fixed rotor core after shutdown.
Why do generators have to have remanence?
For self excited motors, the power generated is generated by the residual magnetism, which is then supplied to the rotor winding to strengthen the rotor magnetic field. Through positive feedback, the output voltage of the generator is gradually increased to the rated voltage. If there is no remanence, the generator cannot generate electricity.
What is the cause of generator loss?
1) the generator is not used for a long time, resulting in the loss of residual magnetism of the core before leaving the factory, and the excitation winding is unable to establish the appropriate magnetic field. At this time, the generator will operate normally, but will not generate electricity. 2) when the generator stops, first stop the prime mover (diesel engine, gasoline engine, etc.), then cut off the load (electrical appliances, etc.), consume the residual magnetism of the core, and make the generator lose excitation.
How to deal with generator loss?
1) disconnect the automatic voltage regulator (AVR) from the exciter stator winding; 2) connect the 24V DC power supply (such as battery) to the exciter stator winding (note that the positive and negative poles of the two should correspond to each other); 3) start the generator set and run it at the rated speed for a period of time.
This article is dedicated by gas generator. For more information, please click: http://www.huannengpower.com. We will provide you with comprehensive services with advanced technology and sincere attitude. We will continue to offer you more information. Please look forward to it.