Power Quality Problems There are a large number of power electronic components in medical equipment. The more common equipment are MRI (nuclear magnetic resonance apparatus), CT machine, X-ray machine, DSA (cardiovascular imaging machine) and so on. Among them, MRI will generate radio frequency pulses and alternating magnetic fields to generate nuclear magnetic resonance, and radio frequency pulse...
I. Analysis of Harmonic Sources and Characteristics Harmonics in AC systems are primarily generated by their core component—Variable Frequency Drives (VFDs/VSDs)—used to drive compressors, chilled water pumps, cooling tower fans, etc. Main Harmonic Sources: Central AC Units: Large centrifugal or screw compressor drive VFDs are the highest power and primary harmonic sources. Pumps ...