Why does the generator set generate shaft current?

In modern power systems, as key equipment for electricity production, the stability and reliability of the operation of generator sets are crucial. However, the generation of shaft current is often overlooked. Next, we will delve into the causes and potential impacts of shaft current in generator sets.

Definition of Axial Current

Shaft current refers to the current flowing on the rotor shaft of a generator, usually caused by the asymmetry of the electromagnetic field inside the generator and the electrical coupling between the rotor and stator. The presence of shaft current not only affects the performance of the generator, but may also lead to equipment damage and failure.

Cause of occurrence

1. Asymmetric magnetic field: During the operation of the generator, the uneven arrangement of the stator winding or defects in the rotor structure may lead to the asymmetry of the magnetic field. This asymmetry will induce current in the rotor, resulting in shaft current.

2. Electrical coupling: There is a certain electrical coupling between the rotor and stator of the generator. When the stator current changes, the rotor is affected, leading to the generation of shaft current.

3. Grounding fault: During the operation of the generator set, grounding faults may cause abnormal current flow, leading to the generation of shaft current.

Impact and harm

The existence of shaft current may cause a series of problems, including:

*Mechanical wear: Shaft current will intensify the wear between the rotor and bearings, shortening the service life of the equipment.

*Overheating phenomenon: The flow of shaft current generates additional heat, causing the generator to overheat and affecting its normal operation.

*Electrical failure: Severe shaft current may cause damage to insulation materials, leading to electrical faults and even equipment shutdown.

conclusion

A deep understanding of the generation mechanism and its impact of axial current in generator sets is crucial for equipment maintenance and management. Regular monitoring and inspection can effectively reduce the generation of shaft current, ensuring the safe and stable operation of the generator set. I hope today's sharing can give you more understanding and interest in generator sets!