高压电机线棒槽部防晕结构的研究

Research on anti corona structure in slot of high-voltage motor

采用有限元计分析方法建立高压电机定子线棒槽部结构的三维模型,计算了槽部侧面垫条绝缘结构中的电场分布以及防晕层的面电阻率、气隙长度和线棒的额定电压等几种因素对防晕层上槽电位的影响。研究表明:防晕层上的最高电位与防晕层所用材料的电阻率和线棒的额定电压基本呈线性关系,较高的电阻率取值或较高的线棒电压会导致槽电位的升高;槽部侧面气隙轴向长度较小时,防晕层上的电位能够大幅度降低;对于特定型号的电机,选用对应特定的电阻率取值范围以及结构参数,是限制过高槽电位的产生,改善电机的绝缘性能的更好措施。

A 3-D model of the slot structure of high-voltage motor stator bar is built with FEM. The electric field distribu- tion in the filler strip insulation structure beside the slot, and the influence of the in anti-corona layer sheet resistivity, air-gap length and rated voltage of stator bar on the electric potential in anti-corona layer are calculated. The results show that the highest potential on the anti-corona layer always keeps linear relation with the resistivity of anti-corona layer and the rated voltage, and the potential can be reduced obviously when the length of the air-gap becomes smaller. As for different types of motor, theselection of corresponding resistivity and structure parameters is the effective measure to limit the potential and improve the insula- tion performance of the motor.