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水电厂旧机组增容有很大潜力，已往水电机组增容改造绝大部分是原水轮机出力范围内改造发电机部分。丰满电站4号水轮发电组增容方法是先考虑水轮机的增容改造（出力和效率），再配套改造发电机及其监控系统，增容幅度大、效果明显。本文主要介绍丰满4号机组的增容改造情况。
Hydropower plant capacity of the old unit has great potential, to the vast majority of hydropower unit capacity transformation is the original turbine output within the transformation of the generator part. The hydropower generating capacity of No.4 hydropower station at Fengman Hydropower Station is to first consider the capacity expansion and transformation (output and efficiency) of hydropower turbines, and then to rebuild generators and their monitoring systems with large capacity expansion and obvious effects. This article mainly introduces the capacity expansion of Fengman Unit 4.