ABB Synpol D 3DDE300406 CMA 126 Board New
About ABB Information
Insulation resistance test During general maintenance work and before the machine is started up for the first time or after long standstill period, the insulation resistance of stator and rotor windings must be measured. The insulation resistance measurement provides information about the humidity and dirtiness of the insulation. Based upon this information, correct cleaning and drying actions can be determined. For new machines with dry windings, the insulation resistance is very high. The resistance can, however, be extremely low if the machine has been subjected to incorrect transportation and storage conditions and humidity, or if the machine is operated incorrectly
The windings of rotating electrical machines are subjected to electrical, mechanical and thermal stresses. The windings and insulation gradually age and deteriorate due to these stresses. Therefore, the service life of the machine often depends on the insulation durability. Many processes leading to damages can be prevented or at least slowed down with appropriate maintenance and regular testing. This chapter offers a general description on how to perform basic maintenance and tests. In many countries, ABB Service also offers complete service maintenance packages, which include comprehensive testing. Before conducting any maintenance work on the electrical windings, general electrical safety precautions are to be taken and local regulations are to be respected in order to prevent personnel accidents, see Chapter 7.2. Safety precautions for more information.
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