Power factor should be high in order to get smooth operation
of the system. Low power factor means losses will be more. it is
the ratio of true power to apparent power. it has to
be ideally 1. if it is too low then cable over heating &equipment overloading will occur. if it is greater than 1 then load will
act as capacitor and starts feeding the source and will cause
tripping.(if pf is poor ex:0.17 to meet actual power
load has to draw more current(V constant),result in more losses if pf is good ex: 0.95 to meet actual power load has to draw
less current(V constant),result in less losses).
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