灭弧角和避雷器是必需的，因为雷击桅杆是很常见的。
Arcing horns and lightning arresters are necessary because lightning strikes to the mast are common.
导弧板将电弧向熄弧栅引导，其靠近动触头一端具有直流引弧角。
A guide arc plate leads the electric arc to the arc splitter and the end close to the active contact is provided with a DC guide arc Angle.
直流换流器熄弧角是直流输电系统的重要电气量，常被用于判断直流输电系统逆变器的换相失败。
The extinction angle of the DC converter, which is usually used to study the commutation failure of the DC inverter, is an important parameter in the DC transmittal system.
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