[Prev][Next][Index][Thread]
Voltage/Length (fwd) (the Kevlar thread)
----------
From: John H. Couture [SMTP:couturejh-at-worldnet.att-dot-net]
Sent: Tuesday, February 10, 1998 12:50 AM
To: Tesla List
Subject: Re: Voltage/Length (fwd) (the Kevlar thread)
Greg, Jim, All -
There are two problems with what is shown below.
The 985 KV (Vs) cannot be measured with any instruments to verify this
voltage.
The 24.2 J assumes RMS conditions which do not exist in the Tesla coil
secondary circuit.
Note that watts = joules/dt = volts x amps x cos A
What did you use for "dt" and "cos A" to satisfy the non RMS conditions?
The Vs voltage can be estimated by using the spark length and comparing it
with the tests results of high voltage labs.
John Couture
-----------------------------------------------
At 08:59 PM 2/8/98 -0600, you wrote:
>
>----------
>From: Greg Leyh [SMTP:lod-at-pacbell-dot-net]
>Sent: Saturday, February 07, 1998 11:47 AM
>To: Tesla List
>Subject: Re: Voltage/Length (fwd) (the Kevlar thread)
>
>Jim Monte wrote:
>
>
>> <snip>
>>
>> You may be able to argue that even the toroid is large relative to the
>> wavelengths of some harmonics, but assume we store all the energy
>> in the topload cap. Redoing with a primary cap of 100nF and only the 50pF
>> toroid cap in the secondary,
>> Primary Energy = 0.5Cp x Vp^2 = 33.8J (at 26kV)
>> Secondary Energy = 0.5Ctor x Vs^2 = 24.2J (at 985kV)
>> Maybe that order for several hundred thousand units can wait a bit.
>
>
>Indeed! These numbers seem much more realistic,
>as they can be attained with a coil efficiency
>of 80%, and by assuming that 90% of the secondary
>energy resides in the toroid at peak voltage,
>which may be attainable by 'Richard Hull grade'
>toploading of the secondary.
>
>Nice detective work!!
>
>-GL
>
>
>