方法：钢帽式磁性附着体为轴对称稳定场，所以可对其断面的1/ 2进行二维磁场分析。

Methods:Because the magnetic field of cup-yoke-type magnetic attachment is stable axial-symmetrical, the authors only analyzed two-dimensional magnetic field of 1/2 section.

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但直流输电对绝缘子的防污秽性能要求高，对其金属附件(铁帽和钢脚)腐蚀厉害。

While DC power transmission requires high anti-fouling property for insulators and causes serious corrosion to their metal attachments (iron cap and steel foot).

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铁帽口采用锌环和钢脚采用锌套，以提高抗腐蚀性能；

Application of zinc ring at the iron cap open and zinc sleeve on the steel foot can improve the anti-corrosion property.

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