09

2021

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11

Routine maintenance of marine generators

Author:

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1. General maintenance

In order to ensure the normal operation of the generator, there should be no accumulation of water, oil and dirt, and no corrosive gas near it, so as not to damage the insulation of the generator winding.

While protecting against moisture and dust, care should be taken not to affect the normal ventilation and cooling of the generator. Always clean the dust and dirt in the ventilation holes and keep them unobstructed. The temperature of the cooling air must not be too low to avoid condensation on the windings and other conductive components.

For generators that stop running for a short period of time for some reason, the collector ring does not need to be wrapped for protection, but insulating cardboard, paraffin paper or asphalt paper should be placed between the brush and the collector ring to prevent the brush from being on the surface of the collector ring— spots on.

If the machined surface of the generator is corroded due to oil and paint falling off, it should be derusted in time and coated with anti-rust paint.

2. Precautions for disassembly

The disassembly and assembly method of the generator is roughly the same as that of the asynchronous motor, but due to the heavy weight of the generator, care should be taken not to bruise when disassembling. When removing the end cover, be careful not to damage the stator coil protruding from the machine base; when taking out the rotor, place a cardboard between the stator and rotor of the motor to prevent damage to the iron core and winding. When binding the rotor with a steel cable, the steel cable must not touch the rotor journal, fan, collector slip and transfer lead. The places where the steel cables are tied must be padded with wooden boards or rubber.

3. For generators that have been out of service for a long time, the following inspections should be carried out before they are put into operation

1: Carefully check the inside of the generator, there must be no debris, and prevent foreign objects such as screw tools from falling into;

2: Check the lubrication of the generator bearings, the quality and quantity of lubricating oil and grease must meet the maintenance requirements;

3: Remove the dust from all parts of the generator;

4: Check whether the connection between the generator and the prime mover is good, and the axes of the two should be on the same straight line;

5: Check whether the rotor is in good condition, check the bearing quality;

6: Clean the collector ring.