I plant production of active filter with hollow reactor adopts multi-layer winding parallel cylindrical structure. And coating Article USES lead to dial the separated form ventilation air way, good heat dissipation, at the same time using small section round wire multi-strand winding equality, Eddy current loss and magnetic flux leakage loss is small, we use each wire in insulation surface using polyester thin film layers Fold package, has the very high dielectric strength, winding with impregnated in sulatedepoxy glass fiber closely around the package, by the high Temperature curing to form a rigid body, its high mechanical strength, resistant to short -circuit current without damage, the impact of the coil Surface with resistance to ozone ultraviolet protective layer, anti-aging, resistant to various harsh climate, targeted to solve the reactance In the application process of several high temperature rise, noise problems, such as between the current level of 25 a - 320 - a, Inductance in accordance with the requirements of the customer production, up to 10 KV voltage level, detailed technical indicators can inquire.