Statistical Analysis of Heavy-load Transformers in Zhejiang Power Grid during Summer

with the continuous rise of summer weather temperature and power load, some transformers operate under heavy-load or even over-load, which has an impact on the safe and stable operation of power grid. This paper makes statistics on 220 kV and above heavy-load transformers (load rate 80% and above) in Zhejiang Province during summer, analyzes the possible causes of transformer heavy-load, and puts forward the follow-up operation and maintenance strategy.