Commutation failure is one of the most common failures for the high voltage direct current transmission system.

在特高压直流输电中换相失败也是主要的故障。

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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。

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The design of filtering equipments at dc side of the converter substations is relative to the security and economy of the high voltage direct current (HVDC) transmission system.

换流站直流滤波装置的设计关系到高压直流输电系统的安全与经济性。

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