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P factor CABLEtalk OCTOBER/NOVEMBER 2020 33


ower factor correction (PFC) has been around since the turn of the 20th century and improves the overall effi ciency of an electrical supply by the controlled


introduction of capacitors on to an electrical system. Power factor is basically a degree of electrical effi ciency. In an AC circuit, it’s the ratio between the useful power kW (true power needed to perform a task) and apparent power kVA (a combination of true power and reactive power, i.e. power drawn in addition to useful power but does not contribute to the task). Power factor is displayed as a fi gure


between 0.01pf to 1.00pf, with a poor power factor generally understood to be less than 0.95pf and a perfect power factor as 1.00pf, known as unity. In layman’s terms, you could describe power factor as a % degree of electrical effi ciency and a good power factor in excess of 95% is normally deemed as


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A standard 600kVAR Power Factor Correction system


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