PF Correction (was RE- Cap Confusion)
From: Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: Thursday, November 20, 1997 2:11 PM
To: Tesla List
Subject: PF Correction (was RE- Cap Confusion)
I second what Ed says. Using power factor correction will save your
house wiring, switches, circuit breakers and plug connections a lot
of heating and stress and cut the bill mildly by eliminating
unnecessary I^2.R heating in the above items. It also relieves a lot
of stress on the variac. A single microwave transformer used on the
230V mains we have here in NZ draws current spikes of the order of
20Amps. I have measured this and scoped the waveforms. This is for a
power draw of less than 1kW. Two in parallel (minimum practical for
serious disruptive discharge coils) doubles that figure.
> From: Esondrmn-at-aol-dot-com[SMTP:Esondrmn-at-aol-dot-com]
> Sent: Wednesday, November 19, 1997 6:03 AM
> To: tesla-at-pupman-dot-com
> Subject: Re: RE- Cap Confusion
> In a message dated 97-11-19 05:20:56 EST, you write:
> I agree that power factor correcting (PFC) capacitors are of little value
> for Tesla coilers. I would not recommend them because they can cause
> resonance problems.
> Reactive currents do not register on power company's kilowatt hour meters
> and are not billed to the customer. Only large electric user customers are
> billed for reactive currents (low power factor) by installing special meters
> like demand meters.
> A Tesla coiler will not save any money on his electric bill if he installs
> PFC capacitors. Reactive currents will circulate thru his house wiring
> system but will do nothing except create a small extra voltage drop when the
> coil is operating.
> Note that the electric power company does not sell electric power to its
> customers, only electric energy.
> John Couture
> I think the only real need for pfc caps is when you have multiple neon sign
> transformers and the total current is too much for the variac at hand. Then
> adding pfc caps may bring the current down to an acceptable level. I used
> them initially when I only had a 10 A variac.
> Ed Sonderman