The book Insulation And Design of Electrical Windings was written by author Arthur Percy Morris Fleming Here you can read free online of Insulation And Design of Electrical Windings book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Insulation And Design of Electrical Windings a good or bad book?
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87 a comparison of curves A and B shows the increase in insulation resistance resulting from the drying out of the windings 176 INSULATION TESTS 177 of a 2000 volt induction motor where the insulation consisted of paper, mica, and tape. The curves also show the effect of temperature on the insulation resistance, and are typical of machines irrespective of the kind of insulation used, although, as a general rule, the decrease in insulation resistance as the tempera- ture is raised is greater whe...re organic materials, such as varnished papers and fabrics, are used than where those of a partly inorganic nature, such as micanite, are employed. 50 30 20 10 o 20 40 60 SO Temperature in c FIG. 87. 100 From the foregoing it might be inferred that a comparison of a number of insulation-resistance measurements obtained on machines over a certain period of time, and under similar tempera- ture conditions, would afford a measure of the facility with which the insulation absorbs moisture. Such, however, is by no means generally the case, since in a moist atmosphere, long before the slot insulation has absorbed sufficient moisture to affect appreciably the insulation resistance, the exposed surfaces on the ends of the windings outside the slot portions will have become slightly N 178 INSULATION AND DESIGN OF ELECTRICAL WINDINGS conducting, due to deposits of moisture.
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