A synchronous alternator is a device that uses a rotating electromagnetic armature to generate current and voltage. It includes a rotor (rotating electromagnetic field) and a stator to provide three-phase voltage. For modern large generator sets, due to capacity limitations, it is no longer possible to use permanent magnets for the rotor, which is generally electromagnet. Using this method requires direct current to be in contact with the slip ring through the carbon brush, and then the excitation current is introduced into the generator rotor by the slip ring.

Under normal conditions, the carbon brushes and slip rings of large diesel generator sets operate relatively stably, and the maintenance workload is relatively small. However, carbon brushes and slip rings are equipment for dynamic and static contact and energy exchange in generators. They are affected by the size of their flow, carbon brush pressure, ambient temperature, humidity, cleanliness, carbon brush and slip ring surface wear, and Due to factors such as its own manufacturing process, it is easy to cause fire between the carbon brush and the slip ring during long-term operation. If hidden dangers are not discovered and dealt with in time, a vicious circle will be formed, causing the brush braid to burn and the slip ring to fuzz , Compression spring breaks, carbon brush breaks, etc., in severe cases, a ring fire will cause the slip ring to burn out and be forced to stop. Emergency shutdown will not only cause the system output to drop, affect the stable operation of the system, but also cause harm to the generator set itself. Through careful analysis and research on the cause of the fire, it is found that methods such as formulating corresponding preventive measures can effectively prevent such failures from occurring.

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