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Generation and Harm of Corona in High Voltage Motors
source：未知 time：2024-11-18 09:17nbsp; click：
Compared with low-voltage motors, the production of high-voltage motor coils is very complicated. The stator windings of high-voltage motors will select different electromagnetic wires according to different rated voltages. During the coil production, anti-corona materials will be wrapped on the straight edges of the coils and the positions extending from the slots, which are what we call high and low resistance bands. The purpose is to prevent the generation of corona during the operation of the motor.
The generation of corona and its hazards
Corona is generated because uneven conductors generate uneven electric fields. Around the uneven electric field, near the electrode with a small radius of curvature, when the voltage rises to a certain value, discharge will occur due to air ionization, forming a corona.
Because the electric field outside the corona is very weak, no collision ionization occurs, and the charged particles outside the corona are basically ions, which form a corona discharge current. Simply put, when the conductor electrode with a small radius of curvature discharges to the air, a corona is generated.
The electric field of the stator winding of the high-voltage motor is concentrated at the ventilation slots and the straight slots, and at the ends of the winding. When the field strength at the local position reaches a certain value, the gas is locally ionized, and blue fluorescence appears at the ionization point, which is the corona phenomenon. The corona produces thermal effects and oxides of ozone and nitrogen, which increase the local temperature in the coil, causing the adhesive to deteriorate and carbonize, and the strand insulation and mica to turn white, which in turn makes the strand loose, short-circuited, and the insulation aged. The electric field distribution on the insulation surface of the stator coil of the high-voltage motor is extremely uneven at the ventilation slots and the slots. When the local field strength reaches a certain value, the gas is locally ionized, and a blue halo appears at the electric nest, generating corona. The occurrence of corona is accompanied by the generation of heat, ozone, and nitrogen oxides, which are extremely harmful to the insulation of the motor.
In addition, when the thermosetting insulation surface is in poor or unstable contact with the slot wall, spark discharge will occur in the slot gap under the action of electromagnetic vibration. The local temperature rise caused by this spark discharge will cause serious erosion of the insulation surface, all of which will cause great damage to the motor insulation. In order to effectively eliminate this corona phenomenon, it is very important to correctly determine the anti-corona structural parameters and select good anti-corona materials. Generally, the insulation material of the motor is made of corona-resistant material, and the immersion paint is also made of corona-resistant paint. In addition, the motor design should take into account the poor working conditions and reduce the electromagnetic load.
The electric field of the stator winding of the high-voltage motor is concentrated at the ventilation slots and the straight slots, and at the ends of the winding. When the field strength at the local position reaches a certain value, the gas is locally ionized, and blue fluorescence appears at the ionization point, which is the corona phenomenon. The corona produces thermal effects and oxides of ozone and nitrogen, which increase the local temperature in the coil, causing the adhesive to deteriorate and carbonize, and the strand insulation and mica to turn white, which in turn makes the strand loose, short-circuited, and the insulation aged. The electric field distribution on the insulation surface of the stator coil of the high-voltage motor is extremely uneven at the ventilation slots and the slots. When the local field strength reaches a certain value, the gas is locally ionized, and a blue halo appears at the electric nest, generating corona. The occurrence of corona is accompanied by the generation of heat, ozone, and nitrogen oxides, which are extremely harmful to the insulation of the motor.
In addition, when the thermosetting insulation surface is in poor or unstable contact with the slot wall, spark discharge will occur in the slot gap under the action of electromagnetic vibration. The local temperature rise caused by this spark discharge will cause serious erosion of the insulation surface, all of which will cause great damage to the motor insulation. In order to effectively eliminate this corona phenomenon, it is very important to correctly determine the anti-corona structural parameters and select good anti-corona materials. Generally, the insulation material of the motor is made of corona-resistant material, and the immersion paint is also made of corona-resistant paint. In addition, the motor design should take into account the poor working conditions and reduce the electromagnetic load.
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