Jakewhis said: Click to expand...If the load is low, you need to adjust the percentage because the current distortion is should be relative to the maximum demand. You can get some pretty high harmonics with relatively low current levels but their impact is minimal. You can adjust the current levels or just focus on the voltage distortion. The current distortion is driving the voltage distortion anyway.
If the load is low, you need to adjust the percentage because the current distortion is should be relative to the maximum demand. You can get some pretty high harmonics with relatively low current levels but their impact is minimal. You can adjust the current levels or just focus on the voltage distortion. The current distortion is driving the voltage distortion anyway.Add:As for kvar vs kW: It can depend on what the supplier is charging for excess kvar. If the kvar is more than about 1/2 of the kW (90% power factor), then it can start becoming an issue if you are charged for excess vars. Note that some utilities may start charging you if the kvar is more than about 1/3 of the kW (95% power factor).If you have no penalty, I would probably consider investigating if the kvar is more than about 60% of the kW value (85.7% power factor).
As with voltage imbalance, covered in the previous article, reactive power and power factor are not power quality issues in the same sense as harmonics and transients, but are of critical importance, particularly with regards to a facilities electrical energy consumption and efficiency. Julian Grant – General Manager at Chauvin Arnoux UK, looks at the causes and effects of high reactive power and poor power factor, along with solutions to improving them.
In a purely resistive AC circuit, voltage and current waveforms are in phase with each other, changing polarity at the same instant in each cycle and all the power entering the load is consumed by the load. Reactive power exists in an AC circuit when the current and voltage are not in phase. Some electrical equipment used in industrial and commercial buildings requires an amount of reactive power in addition to real power in order to work effectively. These tend to be items with copper windings in them; especially transformers, motors, induction heaters, arc welders and compressors, etc., even fluorescent and LED lighting. In the case of inductive loads, the current lags behind the voltage, however, nowadays various capacitive loads may be encountered which cause the opposite effect, that is for the current to lead the voltage.
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