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Poor power quality increases electricity bills and often causes equipment failure. Naturally, we want good power quality. Does this mean we need to get rid of harmonics?
Not necessarily. You can have (some) harmonic distortion and not have a problem with your power quality. You can have problems with your power quality and not have harmonics. Power quality encompasses much more than harmonic content.
To determine whether your power quality is adequate, you really need to do an intensive survey of your distribution system and of the power at your critical loads. Two common problems are:
Violations of the NEC, Article 250, Part V are nearly always present in a facility experiencing power quality problems. Look there, first.