There is a large proportion of high-energy-consumption transformers for distribution transformers in the Daqing Oilfield No. 7 Production Plant, which is running on the entire plant. No matter whether the no-load loss or load loss is high, the new energy-saving transformers will be replaced at the beginning of this year and the power consumption will be greatly reduced. It is estimated that the annual saving of electricity will be 1.6 million kilowatt-hours and the electricity cost savings will be 870,000 yuan.