220kV双母线双分段改造二次回路重难点问题分析与探讨

Analysis and Discussion on the Key Point and Difficult Problems of the Double Subsection Transformation of the 220kV Double Busbar in the Two Sircuit

500 kV变电站220 kV双母线双分段改造工程中的二次回路工作复杂且危险点多。文中针对工作中的"失灵回路改造"、"手合接点扩展"、"PT并列改造"、"停电工序优化"四个方面的重难点问题进行分析与探讨,以减小工作风险,提高工程质量。

The two circuits in the double subsection transformation project of 500 kV substation 220 kV double bus are complicated and more dangerous.This paper analyzed and discussed four important and difficult problems in the following aspects：＂malfunction loop renovation＂,＂hand to hand contact expansion＂,＂PT parallel transformation＂,and ＂blackout process optimization＂.It provided a reference for the same kind of work in the construction of power grid.