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Mechanical, thermal and electrical design requirements of cylindrical support structures for large generators are demanding. High elastic modulus and matching linear coefficients of thermal expansions in the axial and circumferential directions are required to meet design criteria for successful performance of machines. In order to achieve design objectives, a filament winding process using high performance...
During the last fifteen years, the emphasis in stator insulation for central station generators has shifted from electrical to physical properties. To meet this requirement change, the Westinghouse Thermalastic Epoxy insulation system was developed, in which the previously used polyester resins were replaced with epoxy resins. The improved physical properties of this new resin system resulted in a...
Two decades of experience at Westinghouse Large Rotating Apparatus Division evaluating motor insulation systems according to IEEE 275 and its precursor standards show good correlation between service experience on the systems tested and the conclusions drawn from the procedure. Despite its drawbacks and abuses, the test procedure has proved itself a practical and very important technique for thermal...
The rapid and varied growth of modern technology has created many new requirements for large industrial motors employing form-wound pre-insulated coils. In an increasing percentage of these applications a motor is required to operate with a high degree of reliability under severe environmental conditions that may adversely affect the insulation system of the machine.1,2,15,4,5,6 Further, the trend...
The insulation of high voltage stator windings for electric utility generators must have a very high order of reliability. Machines of this category have always been of extreme importance because of their size with the accompanying high capital investment and the dependence of so many things in our society upon their continuous and uninterrupted operation. Lately, the size of these machines, particularly...
In the last decade the electrical industry has become increasingly conscious of temperature classification of insulation. AIEE #1 "General Principles Upon Which Temperature Limits are Based in the Rating of Electrical Equipment" has recognized in recent revisions that temperature classification by chemical composition is inadequate. Therefore, AIEE #1 provides that insulation may be classified...
Rotating electric machines contain conductors, a magnetic circuit and insulation in both the stationary and rotating elements. These elements, along with the mechanical supporting structure form the essential design components of the machine. The electrical insulation is one of the most important factors in determining the reliability of a machine. Much of the uncertainty in connection with machine...
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