Insulation of Rotor Excitation Winding

Compared with stator winding insulation, rotor excitation winding insulation emphasizes more on the mechanical properties of materials, which is determined by the structural characteristics of centrifugal force formed by its high-speed rotation. The rotor speed of hydro-generator is usually tens or hundreds of revolutions per minute, and that of turbo-generator is as high as 3000r/min. Typical insulation structure of rotor excitation winding. The early ground insulation materials of excitation windings were shellac mica or composite materials, and later developed into epoxy glass fabric, mica tape, epoxy glass cloth/NHN/epoxy glass cloth composite materials and aramid paper. The common materials of turn-to-turn insulation are resorcinol epoxy glass grey cloth, melamine glass cloth board and aramid paper. In addition to the main material of stator winding, core and rotor winding components, there are many kinds of insulation materials in the fixed part of the upper winding of the generator, such as slot wedge, corrugated plate, conformal material of fixed rod in slot, etc. There are many kinds of insulating brackets, binding rings, insulating bolts, large conical rings, conformal pipes (ropes, felt, tapes), insulating boxes, insulating water pipes, insulating bushes and lacquer materials for process.