Abstract: This paper analyzes the power saving effect of frequency conversion modification for the residuum pump at the bottom of vacuum tower in the No.2 Atmospheric & Vacuum Distillation Unit with an annual capacity of 5 million tons at SINOPEC Wuhan Company, demonstrates the feasibility and economics of 690V frequency conversion technology in the electrical modification of residuum pump at the bottom of vacuum tower based on the comparison of data before and after the modification, points out the problems existed in modification and operation, and puts forward some suggestions for improvement

Key words: residuum pump at the bottom of vacuum tower, frequency converter, motor, power saving