6ES7212-1BB23-0XB8 都在找亿佳
与低压电机相比,高压电机线圈制作非常复杂,高压电机定子绕组会按照不同的额定电压选择不同的电磁线,线圈制作中会在线圈直线边及伸出槽口位置包扎防电晕材料,也就是我们说的高、低阻带,其目的在于防止电机运行过程中电晕的产生。
电晕的产生及其危害
电晕的产生是因为不平滑的导体产生不均匀的电场,在不均匀的电场周围,曲率半径小的电极附近,当电压升高到一定值时,由于空气游离就会发生放电,形成电晕。
因为在电晕的外围电场很弱,不发生碰撞游离,电晕外围带电粒子基本都是电离子,这些离子便形成了电晕放电电流。简单地说,曲率半径小的导体电极对空气放电,便产生了电晕。
高压电机定子绕组在通风槽口及直线出槽口处、绕组端部电场集中,当局部位置场强达到一定数值时,气体发生局部电离,在电离处出现蓝色荧光,这即是电晕现象。
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