RE: Input power measurement

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "John H. Couture by way of Terry Fritz <teslalist-at-qwest-dot-net>" <couturejh-at-mgte-dot-com>


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You have received several posts regarding your question of why 2000 watts vs
1080 watts. What have you learned?  Is it

    1. Because of modified transformer?
    2. Low power factor?
    3. Resonant charging?
    4. LTR capacitor?
    5. Some other reason?

Do you intend to do more research regarding your question?
The reason I am asking is that this question has come up before on the List
and there are always replies with multiple opinions. Your question obviously
has a lot of potential for research.

John Couture

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-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Saturday, March 08, 2003 2:52 PM
To: tesla-at-pupman-dot-com
Subject: Input power measurement


Original poster: "Skip Greiner by way of Terry Fritz <teslalist-at-qwest-dot-net>"
<sgreiner-at-wwnet-dot-com>

Hi all
I am using a 9kv at 120ma NST. In operation I use an iron vane ammeter
(known to be within 5% accuracy) to monitor current. My mains voltage is
nominally 117V. Interestingly the current into the NST is about 17A when
running in resonant mode. It is my understanding that an iron vane meter
reads true input current regardless of waveform. Therefore my input power to
the NST is nearly 2000 watts.

I would appreciate comments from anyone who can help explain the discrepancy
between the 1080va rating of the "current limited NST and the measured input
in resonant mode operation.
Skip