In Hunan Province, because most of the 600 MW thermal power unit outgoing line all access to 500 kV system, so in the high load time, the 500 kV bus is almost working at high load condition, this is not safe for network. In view of the above situation, a method that the 600 MW thermal power unit outgoing line access from 500 kV system to 220 kV system is introduced. A power company has successfully completed the project, and passed the safety evaluation. This experience can be a reference.% 目前，湖南省内大部分600 MW火电机组出线均接入500 kV输电线路，由此造成区内高负荷时段500 kV 系统下网负荷较高，电网安全供电局面被动。针对以上情况，本文介绍了将600 MW 火电机组由500 kV 系统改接至220 kV 系统的改造方法。对某电力公司的火电机组进行改造后，机组开机一次并网成功，并网安评一次通过。项目实施的成功可为同类机组的相关改造提供参考。
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