Rotating electric machines are complex structures that are exposed to the following forms of stress:
- mechanical
- electrical
- thermal
- environmental
These stresses may be of varying magnitudes. The electrical insulation systems are susceptible to damage that is caused by the stresses that are listed above. Exposure to these stresses may shorten the effective life of the electrical insulation system. Therefore, the service life of an electric machine will largely depend on the serviceability of the electrical insulation systems. An inspection program and a testing procedure are recommended. An inspection program and a testing procedure will ensure that the equipment is maintained in satisfactory condition. This will increase field reliability.
A regular maintenance and inspection program can provide an evaluation of the present condition of the equipment. A regular maintenance program and a regular inspection program can also reveal future problems. The frequency of this maintenance program will depend on the following factors:
- application
- environmental conditions
- experience level of the operator
- philosophy of the operator
A regular maintenance program is strongly recommended. This program would involve the following steps:
- periodic disassembly
- knowledgeable visual examination of the equipment
- the application of electrical tests
Never perform a test over the rated potential. These tests can damage insulation that is contaminated or insulation that is in marginal condition. For more information, consult a Cat dealer.