China Petroleum And Chemical Corporation(hereinafter referred to as "sinopec") is a joint-stock enterprise integrating upstream, middle and downstream, with prominent main industries in petroleum and petrochemical industry, relatively complete sales network, and listed at home and abroad.Sinopec is a joint-stock enterprise established on February 25, 2000 by China petrochemical corporation in accordance with the company law of the People's Republic of China.
On July 31, 2017, the list of China's fortune 500 was released, and China petroleum and chemical corporation ranked first.China petroleum and chemical corp., or sinopec, ranked ninth on a list of the world's 250 largest energy companies for 2018 released by S&PGlobalPlatts.

In November 2017, on the basis of sufficient technical exchange and communication, the two sides signed the test agreement of huakong energy-saving protection device, decided to make energy-saving transformation of no. 2 1600kVA transformer of changling branch of sinopec, and made detailed operation and construction plan for this project.
Considering that thisenergy supply system is a primary energy supply system with dual transformers for hot standby, on the basis of doubling the rated current in the production and design of the product, the ultimate overload capacity is increased by 20%, which can completely meet the requirements of switching all theenergy equipment of pollution pollution to a single transformer, ensuring the safety and reliability of the product.

The annual cost of the low-voltage transformer of sinopec changling branch is RMB 2,500,000,40%. The annual electricity cost of the low-voltage part is RMB 1,000,000,000. After the completion of the transformation, the annual electricity saving benefit will reach 110,000,000.