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).
在此基础上，对绝缘子及钢帽的形状进行了优化设计，试图使其耐压得到改善。
On this basis, the optimal designs of the shapes of the insulator and its steel cap are completed in an attempt to improve the voltage withstanding (?)capacity of the insulator.
在此基础上，对绝缘子及钢帽的形状进行了优化设计，试图使其耐压得到改善。
On this basis, the optimal designs of the shapes of the insulator and its steel cap are completed in an attempt to improve the voltage withstanding (?)capacity of the insulator.
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