[Amps] Arcing

[dj2001 at mn.rr.com]

>  >...
>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.
>
>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

  A thousand volts is a bit much, I've read up to 600 or 700 volts, 
depends on the size of the creature.  Each of it's electrocytes 
generate .15 volt.  Interesting fish huh.

Dale J.


>cheerz, Jeff
>
>
>-  R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K,
>www.vcnet.com/measures. 
>end
>
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