----- Original Message -----
From: "rlm" <2@vc.net>
To: "Jeffrey Madore" <K1LE@arrl.net>; " AMPS" <amps@contesting.com>
Sent: Saturday, March 08, 2003 12:10 PM
Subject: Re: [Amps] Arcing
> >...
> Tom Rauch:
> >> >As you learned, an open termination on a current transformer can
produce
> >> >some large voltages!! But no more that the turns ratio of the
transformer
> >> >and operating voltage would indicate.
> >>
> Me:
> >> ** it is my opinion that the counter-EMF spike can be many times the
> >> rated primary operating V.
> >
> >Yes, Rich, this has always been my understanding also. In fact, it's
> >difficult to define the extent of the CT primary, to determine the
voltage.
> >The cable may connect from one phase of a power transformer to a bus
feeder
> >breaker 300 ft away. It seems there's always more to things than first
meets
> >the eye. I once listened to a man lecture on "motor stator insulation"
for 2
> >solid days...and he kept my attention! It seemed he lived for motor
stators!
> >A life like that is for people who don't know how to fish.
> >
> >Jeff
> >
> When DC current abruptly stops, the potential for reverse potential is
> impressive. I've measured 400v-pk with an o'scope across 24vdc relay
> coils. I would like to hear Mr. Rauch's explanation of why the operating
> voltage limits reverse potential.
>***
*** Remember the Fourier Analyse of a square wave.
Transition phenomena are very near of square wave, the seventh harmonic
,there are only the odd onces, has the highest peak, often much more the ten
times the original value.
" Whats in a name Mathematics......."..but already 40 years ago...;
Jos
> Ever tried fishin' in the amazon? I understand there's a eel-like fish
> named Electrophorus electricus in there that can do 1kV @ 1A when full
> grown to c. 6-ft. Presumably, a carbon-fiber fishing rod is not a wise
> choice
>
> cheerz, Jeff
>
>
> - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K,
> www.vcnet.com/measures.
> end
>
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