关键词: 石油化工, 660 V供电系统, 节能降耗, 保护灵敏度

Abstract: As one of domestic standard voltage level, 660 V is applied generally in mining machinery, coal chemical industry and other industries. While the low-voltage system in the petrochemical industry is still dominated by 380 V. Under the background of global carbon neutralization and carbon peak, all walks of life are trying to develop new ways to save energy and reduce consumption. The thesis is based on a specific project to discuss the application of 660 V system in petrochemical systems, and explain its advantages from the perspective of energy saving, consumption reduction and relay protection. Petrochemical enterprises have large load and long power supply distance. While saving investment and reducing loss, 660 V power supply system greatly improves the power supply radius of substation, which can produce obvious economic and environmental benefits. Under the current situation, it is significance to popularize 660 V voltage level.

Key words: petrochemical industry, 660 V power supply system, energy saving and consumption reduction, protection sensitivity