# Power Factor Correction

• To: tesla-at-grendel.objinc-dot-com
• Subject: Power Factor Correction
• From: richard.quick-at-slug-dot-org (Richard Quick)
• Date: Thu, 26 Jan 1995 22:43:00 GMT
• >Received: from uustar.starnet-dot-net by csn-dot-net with SMTP id AA16344 (5.65c/IDA-1.4.4 for <tesla-at-grendel.objinc-dot-com>); Thu, 26 Jan 1995 17:59:33 -0700

``` * Carbons Sent to: Esondrmn-at-aol-dot-com

If anybody else caught my post of yesterday, you will already
know how bad I screwed up the formula for deriving the Power
Factor Correction capacitance required to efficiently operate
neon sign transformers as Tesla coil power supplies. All I can
say is that I am human, and that it has been over a year since I
first posted the erred formula, and I was just now notified of
the problem. I guess I could go on with the excuses, about how my
coil ate the chip in my TI-55 calculator with scientific
notation, or my undiagnosed math dyslexia, or whatnot <grim grin>

The problem was with the Corrected kVA figure of the equation,
and the most correct information I can come up with after
researching this problem for the better part of the day was the
following information provided courtesy of Jefferson Electric
Co., Tel: (708) 806-6500.

Corrected Power Factor

Secondary Rating     Volt-Amps
kV,mA                (VA)

15,120                 900
15,60                  450
15,30                  250
12,120                 775
12,60                  400
12,30                  200
9,120                 600
9,60                  300
9,30                  150
7.5,120                 500
7.5,60                  250
7.5,30                  125
6,60                  200
6,30                  100

Basically the VA number from this correction table must be
substituted for the directly calculated VA from the neon sign
transformer output. I have listed a few common neon ratings to
the left, with the corrected VA numbers to the right. Divide the
VA numbers given by 1000 to provide the "Corrected kVA" number
used in the formula that went out previously.

Again I am very sorry if this has caused any inconvenience.

Richard Quick
... Even if you do succeed, destruction of evidence is now mandatory.
___ Blue Wave/QWK v2.12

```