Power Factor

This guy might help you, again. Ron Nombri

Please define the question more clearly. When you say "single phasing," do you mean a 3-phase system with a lost phase, or do you mean an actual single-phase system? What does the "power factor controller" consist of?

YES SIR...i mean a 3 phase system with a lost phase. and i mean if there is a power factor system already installed in our company.

Is this the same system you have been having problems with all along?

I guess the question is : what is the effect of running a capacitor bank (automatic power factor control panel ) connected to the electrical systems (3 phase ) if one phase line is missing .

Single phasing is a term used to represent operation of 2 phases in a 3 phase system due to missing of one phase.

Sure, your guess is right...that is the question.

"A very good question" says the Prime Minister.

"Thanks............. but...... what is the answer, Prime Minister?" asks the TV interviwer in "Yes, Prime Minister"

Sorry, couldn't help it

1)If one phase fails for a 3phase capacitor will the other two become overloaded and if there is no OL protection will the fuse blow?.

2) If the failed phase(in main CB/Fuse) was feeding the control circuit everything(all contactors) will release and pf becomes very low,but if another phase fails will the situation be similar to 1) above,will the PD in CB operate?. If it is fuse should we include an OCPD?.

I have no answer. I am also looking for the answer.

Until the circuit protective device(s) operate(s), there will be too much capacitance in the circuit.

Thanks

Will this high capacitance cause any damages in the system ?

Normally we will be providing relay to protect against single phasing, whether we have to consider the protection against high capacitance also ?

Where is the relay connected at input of individual capacitors after the CB/Fuse or at the main CB/fuse?.