I have some digital power meters at work that we installed due to previous concerns of voltage instability. The voltage instability has been corrected and these are now primarily used for monitoring of energy usage. I have noticed some strange reactive power measurements. These meters report a lagging power factor as positive vars (inductive) and a leading power factor as negative vars (capacitive). At no load, or very little load, when we have many idle VFDs, large transformers and voltage regulators online but without any load, the meters report a lagging power factor or positive vars for the most part, which I believe. When we start bringing loads online, motor loads to be exact, the vars start to go negative and the meters report a capacitive load. This seems to be the opposite of what would be expected. Wouldn’t you expect the power factor to be lagging even more as motor loads are brought online? What would cause these meters to report a capacitive load as inductive loads are brought online? Thanks!
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