High voltage motor high pressure in the electromagnetic oscillation for a long time, under the action of high temperature and high electric factors such as, being attack by electromagnetic oscillation of mechanical wear and corrosion of corona and over heat insulation aging, makes the overall motor coil insulation shell, delamination, roasted meats, wear and dielectric strength to reduce the level of unhealthy phenomenon, eventually lead to insulation breakdown. Ms。 Join today to communicate with you a brief about the corona and oscillation influence on the coil insulation. 1, corona to operate the motor winding is the harm of high voltage motor coil insulation under high electric field strength, and if the insulating appearance anticorona coating (High and low stopband or anticorona lacquer)Contact with the stator core, coil oscillation in a slot will wear insulating appearance anticorona coating. At the moment, the insulation appearance of iron core has high potential, corona discharge in a worn parts, forming part of the instantaneous high temperature, will be the main coil insulation and other insulation materials burning, burning. Corona discharge can also attack force strong chemical reactions, serious corrosion and coil insulation wire, so there are a lot of corrosion in the severe parts set green powder. Else, winding end anticorona processing owe good, will form the capacitive current is too large, cause fever, stator end winding corrosion speed up the end winding insulation heat aging. 2, motor vibration to the harm of winding insulation contains mechanical oscillations and electromagnetic oscillation, motor in various oscillation operation, wear out coil insulation, corrosion is one of the main electromagnetic oscillation on the motor end winding and the influence of notches. If the low quality of stator core being connected to owe good, winding end binding technology is bad, varnished effect is poor, can make coil in oscillation trough by fixed bad, attack, article interlayer pad and temperature measuring element pad will wear in the onset of displacement between primary coil and coil, the coil insulation damage. Low if the coil wire during operation by the current attack 2 times frequency electromagnetic oscillation force, will not only make the coil and iron core and winding end distance block onset of oscillation, the main wear insulating appearance, and still can make between the conductor and the main insulation, wire attack conflicts between interturn, shares of oscillation, the formation of wires interturn, lax, short circuit, break between the shares. If the attack insulation short circuit. In the onset of additional loss of parts of the short circuit and temperature rise, will speed up part of the main insulation aging, reduce the dielectric strength, even also can form under normal operation voltage insulation breakdown of failure.
