Abstract: The development of high voltage variable frequency technology directly pushed forward the energy saving and consumption reducing of thermal power plant. There are many kinds and manufacturers of the frequency converter, and there exist greater difference in their technical levels, and these cause some difficulty for high voltage frequency converter selection. The thought of type selection in variable frequency technical reformation of condensate pump in Guizhou Dafang Power Generation Corporation Limited was introduced. Some experiences obtained from debugging and operating of the variablefrequency system were summarized, and the energy saving effect of the variable frequency reformation was analyzed.

Key words: high voltage variable frequency technology, system scheme, energy saving effect