Winding insulation and maintenance

Materials and their properties 9 class A 9 class E 9 class B 9 class F 9 class H 9 of insulation 9 of insulation systems 9 motors 9 motors 9 for vacuum pressure impregnation 9 of insulation 9 insulation failure 9 of the insulation level 9 of the insulation level in large machines (1000 kW andabove) 9 the quality of insulation of MV formed coils and resin-poorwindings during manufacturing 9 of dielectric loss factor or dissipation factor (tan d) 9 test of resin-poor windings 9/264 Relevant Standards 9/265 List of formulae used 9/265 Further Reading 9/2659 Windinginsulation andmaintenance9/255 Winding insulation and maintenance9 Insulating materials and theirpropertiesThe insulating materials form the heart of an electricalmachine. During operation these materials may be subjectto electrical, thermal and mechanical stresses andmust be capable to endure the same and possess thefollowing,Electrical stresses high breakdown voltage good long time performance low partial discharges (minimum voids withininsulation or on interface between insulation systems) very small leakage or creepage stresses high long time performance small deformation after temperature cycles least delamination within insulation materialMechanical stresses high mechanical strength to sustain forces due tohandling and mechanical forces

Winding insulation and maintenance9/257 9.1 Insulating materials and their properties The insulating materials form the heart of an electrical machine.

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