| Summary: | Frequency control techniques have been widely applied in chemical processing. However the effects on whole unit energy consumption caused by transducer high harmonics and its additional loss have not been paid enough attention. An experimental study was conducted by using self-priming pump unit as a research object, utilizing NI virtual instrument, and Labview test software and high-frequency electric parameter analyzer. Performance parameters of the pumps and electric parameters of pump system were measured before and after pump unit filtering. Pump unit energy consumption under both circumstances was computed and analyzed. It can be found that unit energy consumption differs from 3% to 6%, while electric motor efficiency differs in 10 percentage points. Pump unit energy consumption difference increases with the loss of frequency before and after filtering. All the above has provided a basis for proper use of transducers and determining the speed range of the pump unit.
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