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Why the Carbon Brush of Diesel Generator Set Easy to Failure

Feb. 18, 2022

When a fault occurs during the operation of the carbon brushes of the diesel generator set importing and exporting current, the type and nature of the fault can be identified, and the fault can be eliminated as soon as possible to ensure the stable operation of the equipment. Starlight Power Generation Equipment combines many years of experience to talk to you about the application of motor carbon brushes and to jointly avoid the occurrence of carbon brush accidents. Carbon brushes are electric brushes. Improper maintenance and use of the carbon brushes of diesel generator sets in operation will cause accidental load reduction or even shutdown.

Factors leading to the failure of carbon brushes of diesel generator sets:


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1. Electromagnetic factors: When the reactive power or excitation current is adjusted, the spark of the carbon brush changes significantly. When the exciter is commutated, the contact between the carbon brushes and the commutator segments is poor, and the contact resistance is too large; the oxide film of the commutator or slip ring is not uniform in thickness, causing the current distribution of the carbon brushes to be unbalanced; or the load changes suddenly, and the sudden Short circuit leads to abnormal voltage distribution between commutator segments; overload and unbalance of the unit; unreasonable selection of carbon brushes, different spacing of carbon brushes; quality problems of carbon brushes, etc.


2. Mechanical factors: the center of the commutator is not correct, the rotor is unbalanced; the vibration of the unit is large; the insulation between the commutator segments is protruding or the commutator segment is protruding; the contact surface of the carbon brush is not smooth, or the surface of the commutator is rough and causes contact Bad; the surface of the commutator is not clean; the air gap under each commutation pole is not equal; the spring pressure on the carbon brush is uneven or the size is not suitable; the carbon brush is too loose in the brush holder and jumps, or the carbon brush is too tight The brush holder is stuck etc. Reduced unit speed or improved vibration will reduce sparks.


3. Chemical factors: The diesel generator set is running in corrosive gas, or the operating space of the unit lacks oxygen, and the naturally formed copper oxide film on the surface in contact with the commutator and the carbon brush is destroyed. , The commutation of the approximate linear resistance no longer exists, and the commutator spark intensifies in the process of re-forming the oxide film on the contact surface. The commutator (or slip ring) is corroded by acid gas or grease. Carbon brushes and commutators are contaminated, etc.


In recent years, the sustained and rapid development of the national economy has expanded the already severe power supply demand gap. The deployment and installation of new units, self-provided power supply systems and self-provided engine systems in various industries can be seen everywhere. However, the carbon brush operation and maintenance technology of the excitation system of diesel generator sets is a traditional technology, and there has been no substantial breakthrough in the technology and technology level for many years. Therefore, all parties have not paid enough attention to the generator excitation system, and the investment is limited, which leads to the carbon brush accident of the excitation system.


Starlight Power was founded in 1974 and is one of the earliest manufacturers of generators and diesel generator sets in China. If you want get more information, please feel free to send email to sales@dieselgeneratortech.com we will pay highly attention on your question.

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