kW reductions from capacitors

[GoldDigger]

But the difference in voltage at the load will not directly tell you the difference in VD, since there are vectors involved.
A highly inductive supply (just out a real inductor in for example) can cause a large voltage drop to the load without dissipating much power at all. A perfect inductor would have no I^2R loss.

Looking at first order effects, you do not care about the resulting load voltage, only about the resistive component of the VD.

Tapatalk!

 

[Sahib]

The very notion that the PFC would be connected downstream of the motor overload is not something I would expect any half competent engineer to do.

It is a well known industrial practice.

And on making the capacitor smaller if the motor is not running at FLC is a bit odd as well.

Making capacitor smaller but still serving the need makes economical sense. In your case also, the corrected pf is about 0.97 and not unity.

Draw out the Steinmetz equivalent circuit and you may begin to understand.

Begin to understand what?!

we always fit a contactor for the PFC.

It can be a needless expenditure in cases when motor and capacitor to be run as a unit.

 

[Besoeker]

It is a well known industrial practice.

I'll bow to your vastly greater experience in that field.

Making capacitor smaller but still serving the need makes economical sense. In your case also, the corrected pf is about 0.97 and not unity.

I know what it was - I calculated it.

Begin to understand what?!

What the C bit of the PFC is doing.

It can be a needless expenditure in cases when motor and capacitor to be run as a unit.

It's an avoidable risk. That we avoid,

 

[Sahib]

I'll bow to your vastly greater experience in that field.

God bless.

It's an avoidable risk. That we avoid,

But this is silly, showing a lack of Engineering judgement.

 

[Besoeker]

God bless.

But this is silly, showing a lack of Engineering judgement.

Is it a risk you have taken with PFC?

 

[Sahib]

Is it a risk you have taken with PFC?

It is a risk if you mindlessly apply over sized capacitor across a motor to be operated as a single unit. I didn't.

 

[Besoeker]

It is a risk if you mindlessly apply over sized capacitor across a motor to be operated as a single unit. I didn't.

I'm quite sure you didn't and haven't.
Go in peace.

 

[Sahib]

Sure, but don't charge your customers unnecessarily more again.

 

[Besoeker]

Sure, but don't charge your customers unnecessarily more again.

Instruction noted. And given the credibility it merits.

 

[jim dungar]

And it is time to bring another discussion to an end.