Motors are designed to operate between 50 & 100% of rated load. Most motors best operating efficiency is around 75% of rated load. Power Factor (PF) is a measurement that can quickly determine the amount of load on a motor. Typically motors with low PF during normal operation are over-sized for that application and will cost more to operate than a motor more correctly sized. Motors operating with low PF will contribute to low system PF, which could result in high PF charges by the utilities and also create higher energy loss within the motor. Using PF to correctly size motors in the plant will result in increased electrical reliability and less wasted energy.
Electrical Signature Analysis (ESA) evaluates both voltage and current, thereby giving a broad view of motor system health including incoming power quality. Combining this information with knowledge of the application can indicate opportunities for energy cost savings.