Field insulation materials and problems
Abstract
In a turbine generator the rotating field requires insulation materials and design considerations much different from the high voltage insulation used for armature windings. The principal properties to be looked for are mechanical strength, resistance to abrasion and resistance to thermal degradation. Electrical strength is also important because field windings are required to withstand a high potential test of ten times rated voltage. Some of the materials used over the years ranged from various kinds of fibers and flake mica composites, to asbestos, fiberglass epoxy or polyester laminates, Nomex and combinations of fiberglass, Nomex and insulating films. New materials have been applied to satisfy demands for better properties as generators grew in size and output, and it is the new materials that have made it possible to obtain more power from smaller machines. Field insulation materials and problems are discussed further.
- Publication:
-
Rotating Machinery Insulation
- Pub Date:
- December 1981
- Bibcode:
- 1981romi.work.....V
- Keywords:
-
- Friction;
- Insulation;
- Reliability Analysis;
- Turbine Engines;
- Turbogenerators;
- Design Analysis;
- Electrical Properties;
- Stress Analysis;
- Thermal Conductivity;
- Winding;
- Electronics and Electrical Engineering