Reactor used in the system more and more, but also so that it often appears in the operation of some similar failures, the author based on years of operating experience, to introduce several common faults and treatment methods. Along the surface discharge Reactor in the outdoor air conditions, running for some time, the surface will be dirt deposition, in the fog or rain, the surface of the damp, resulting in surface leakage current increases, the heat. As the evaporation rate of water varies, the surface of the local dry area, causing the local surface resistance changes, the current in the interruption of the formation of local arc. As time elapses, the arcs will merge to form dendritic discharges along the surface. The turn-to-turn short circuit is a further development of the dendritic discharge, that is, the current in the short-circuit coil increases sharply, and the temperature increases the insulation damage. In order to ensure that the outdoor reactor does not occur dendritic discharge and inter-turn short-circuit fault, brushing the hydrophobic coating can significantly inhibit the surface discharge; end embedded ring current sharing electrode to overcome the lower surface leakage current concentration phenomenon; Cap and the addition of rain layer, to a certain extent, inhibit the surface leakage current. In addition, in the more serious areas of contamination, should increase the surface cleaning reactor and insulator surface frequency. Local temperature is too high Reactor in the running temperature is too high, to accelerate the aging of polyester film, when the introduction line or cross-surface epoxy cracks in the rain after infiltration accelerated aging, loss of mechanical strength, resulting in interturn short circuit caused by fire burning. Reasons caused by the reactor temperature: welding quality problems, wiring terminals and winding welding resistance of the welding resistance and additional heat. In addition, as the temperature rise of the design margin is very small, so that the design value and the national standard temperature limit is very close. In addition to design and manufacturing reasons, in operation, if the reactor air passage blocked by foreign body, resulting in poor heat dissipation, can also cause local temperature is too high cause fire. For the above, should improve the reactor ventilation conditions, reduce reactor operating ambient temperature, thus limiting the temperature rise. At the same time regular maintenance outage (available water column washing reactor surface and the vertical cooling airway), in order to clear the surface accumulation of dirt, keep the airway open, and external insulation state of detailed inspection and found the problem in time. Vibration noise fault Core reactor running vibration larger, causing loosening of fasteners, noise increases. The main cause of vibration is a magnetic circuit failure and manufacturing installation of the core is not pressed or clamp loose. Generally only need to fasten the fastener again. Sometimes encountered in the reactor after the AC input noise (base frequency of 100Hz) great, and accompanied by a rhythm of the beat frequency of the ground, the ground fever. This is because of the strong alternating magnetic flux of the air-core reactors, which brings resonance and eddy currents caused by alternating electromagnetic force to the surrounding steel members, especially the embedded parts. This is the basic design and installation of infrastructure issues, can only be carried out a thorough transformation.
zachary0312
