Generator and Capacitor Questions: Parallel Connections

http://en.wikipedia.org/wiki/Power_factor_correction

If your generator has automatic voltage regulation then the power factor correction capacitor may interfere with the correct operation of this unit.

DEAR

AUTOMATIC VLTG REGULATION IS AVAILABLE ON DG

THAT MEANS WE CAN INSTALL CAPACITOR

If I understood the other poster correctly (Peterd), you should first check with the manufacturer of the regulator before using the cap.....it may interfere with the regulator's functioning in some way.......

A direct connection of a capacitor on the generator output terminals will lead the later to self excitation, and thus over voltage.

For this reasons, it is always necessary to

a)intall at generator terminals a lightning arrester and a capacitor for the atenuation of overexcitation effects

b)provide the system with an overtvoltage protection. It will actuate if the voltage exceeds a certain value. It is important that further to open the breaker terminals it als actuates in the excitatin, not only disconnecting it, but also providing its de excitation

Regards

There is no good reason to connect a capacitor across the generator output, and plenty of reasons not to do so. Power Factor correction capacitors should be connected as near to the load as possible, to minimize the reactive current flowing through the power cables.

The pf rating of 0.8 on the generator does not mean that the generator always operates at that power factor, just as a generator rated at 500 KW does not always produce that much power. Since the manufacturer has no way of knowing what load the end user will connect to the generator, he designs the unit to a standard value. The power output, and the power factor, are determined by the connected load. The pf rating of 0.8 is the lowest power factor which the generator can supply and still produce rated KW.

You are almost right.

But in order to avoid voltage surges in large generators, it is used to apply a combination of a capacitor and a lightning arrester.

This is useful for surges of the switching nature.

Regards

I was under the impression, that power factor correcting capacitors were to be installed near the inductive load, not at the power generating source.

That is the same as Post #6 said and I agree with you both!!

It's a terrible thing to get old!

Mr. Tambe,

As you know that the requirement of power is in terms of Active and reactive power both due to magnatization of transformers, few inductive part of transmission line and most of the inductive load, it is necessory to make generators on pf 0.8

Prof. P. M. Sonwane

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