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130kW Coil -- Oh No!
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From: Wysock, William C. [SMTP:Wysock-at-courier8.aero-dot-org]
Sent: Friday, February 06, 1998 8:34 AM
To: Tesla List
Cc: ttr
Subject: RE: 130kW Coil -- Oh No!
John, All,
The manner and technique I use to measure reflected power
on large Tesla coil systems is as follows. I measure actual
wattage, amperage, and voltage at several key points in the
controller's circuitry. Since a switchboard type kilowatt meter
requires both a potential transformer and a current transformer,
its reading is based on the relationship of the current phase
angle with respect to the voltage phase angle, in that part of
the circuit to which it is connected. Doing this, at the a.c. mains
as well as across the primary of the H-V transformer, shows
the relationship of total "forward" going power, vs. "reflected"
going power. Since I employ the use of a high current
continuously variable inductance, while the coil is energized,
I can adjust load voltage and series inductance, and observe
the readings on the two separate kilowatt meters. It is possible
to adjust the autotransformer settings such that the load side
of the controller shows a considerably lower KW reading, then
is shown on the a.c. mains meter. Under this condition, the load
ammeter will read considerably higher then the a.c. mains
ammeter. This is reflected (out of proper phase relationship
current.)
In the same manner, when both KW meters read approximately
equal, (both must be peaked,) then looking at the amp meters
shows the lowest (and more or less equal) peak value, and the
Tesla Coil system performance is at its best. An interesting note:
when the Tesla Coil controller's adjustments have been "peaked",
the load side voltmeter very clearly shows "resonant rise". This
may be seen as an increase of over 50 volts in that part of the
circuit.
Bill Wysock
-------------------------------------------
Tesla Technology Research
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From: Tesla List
To: Tesla List
Subject: 130kW Coil -- Oh No!
Date: Thursday, February 05, 1998 1:13AM
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From: John H. Couture [SMTP:couturejh-at-worldnet.att-dot-net]
Sent: Wednesday, February 04, 1998 7:11 PM
To: Tesla List
Subject: Re: 130kW Coil -- Oh No!
At 09:10 AM 2/3/98 -0600, you wrote:
>
>----------
>From: Wysock, William C. [SMTP:Wysock-at-courier8.aero-dot-org]
>Sent: Tuesday, February 03, 1998 8:46 AM
>To: Tesla List
>Cc: ttr
>Subject: RE: 130kW Coil -- Oh No!
>
>
>Greg,
>
>It sounds like you're really getting the (un-named) 130 KW
>coil going now. As for 5 amp full scale meters and current
------------------------------------------ Big snip
>If you take a 4 channel vertical input scope and monitor the
>output of all your C.T.'s in their various positions of the control
>circuitry, and sync the time base to the input of the a.c. line,
>you can see the phase shift changes in the different parts of
>the circuit. The C.T.'s don't "know" the difference between
>forward going and reflected power.
>
>Bill Wysock
> --------------------------------------------
>Tesla Technology Research
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Bill -
How did you measure reflected power for the Tesla coil? I show a graph and
some calculations for TC reflected power in one of my books . However, I was
not successful in trying to set up instrumentation to measure it.
John Couture