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).
本文叙述了直流输电线路使用瓷绝缘子存在的问题。
This paper mentions the problems on applying china insulator by the direct current transmission.
因此，对盘形悬式绝缘子直流覆冰试验方法进行研究，对直流覆冰输电线路外绝缘特性的研究具有重大的意义。
Therefore, it has great significance to research DC icing test methods on disk-shaped suspension insulator for study of DC transmission line characteristics of external insulation.
本文分析了合成绝缘子的优点，论证了在直流输电系统中使用合成绝缘子的可行性。
This paper discusses the advantages of composite insulator and the feasibility of using composite insulator in direct current transmission.
在现有污闪机理的基础上，提出一种能反映直流污闪基本特点，并计算绝缘子直流污闪电压的数学模型。
A mathematical model is presented according to the mechanism of DC pollution flashover for computing DC pollution flashover voltage.
瓷绝缘子广泛使用在交直流输电系统中，但在直流输电系统中使用还存在很多问题。
Ceramic insulator is widely used in alternating and direct current transmission system. But there exist some problems when using ceramic insulator in direct current transmission system.
瓷绝缘子广泛使用在交直流输电系统中，但在直流输电系统中使用还存在很多问题。
Ceramic insulator is widely used in alternating and direct current transmission system. But there exist some problems when using ceramic insulator in direct current transmission system.
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