火力发电厂及变电所中悬垂绝缘子串片数的选择是电气设计中必须的步骤和容易产生混乱的难点，因此本文对此进行了研究。
Test and research result shows that the retrofit of backward V insulators can be carried out for 500 kV suspension insulator string, and when it is .
最初它们是圆圆的金属片，中间有一个洞，这样一根绳子就可以把它们串在一起。
Originally they were round pieces of metal with a hole in the center, so that a piece of string could keep them together.
盘管的标准型式均为铜管串铝翅片结构，采用机械胀管。表冷段设计有倾斜式排水盘，保证彻底排尽水盘中的凝水。
All standard coils are mechanically expanded copper pipes plus aluminum fins. The surface cooling section is equipped with a pitched discharge coil to ensure complete discharge of condensed water.
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