Re: Power factor correction kvar policy in countries

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#12437
pillay
Participant

sinnadurai sripadmanaban said:

1)Should we disconnect capacitor bank when powered by a generator?.

2)Can somebody give ratings of capacitors for starting(reducing starting current) induction motors for various sizes of motors(hp/rpm)?.

3)Can somebody give ratings of capacitors for pfc of individual motors of different hp/rpm

Thanks


sinnadurai sripadmanaban said:

1)Should we disconnect capacitor bank when powered by a generator?.

2)Can somebody give ratings of capacitors for starting(reducing starting current) induction motors for various sizes of motors(hp/rpm)?.

3)Can somebody give ratings of capacitors for pfc of individual motors of different hp/rpm

Thanks

1) Capacitor banks are connected to correct the PF in the system,if the pf is low, than for the same load the ampere would be higher.If your load is always below fulload or tripping treshold than its ok you may disconnect  the pf bank.

2) Caps are not used for reducing starting current.

3) Ratings of capacitors for pf correction can only be determined by knowing your existing pf and to what pf you want to improve to.


Juan Carlos said:

By the rules in Brazil, users supplied at voltages greater that 2.3 kV (group A) must have their PF verified by the utility in a mandatory and permanent way (art. 34, reg. 456/00). Users supplied at voltage lower than 2,3 kV (group B) can measure their PF in a facultative way. If that PF is lower than 0.92 (inductive or capacitive), reactive energy consumption and demand are mesure and charges apply (Art. 49, reg. 456/00). Furthermore, according to art. 68, reg. 456, users from group B can be charged by their reactive energy and demand, if their PF is lower than 0,92 during a minimum period of 7 days. From my point of view, if utilities adopt electronic meters to also register the PF of residential users, there are no regulation that don't allow them to charge us by the reactive energy. So, the end is near… Are you agree?