Running large amounts of current over that distance is not usually a
good idea. Put a 'current to voltage' transformer (little xformer with
large hole in the middle) over one of the AC wires and connect a
voltmeter remotely. Now you have only low voltage, low current running
back to the control room. Use a voltmeter and the specified load for
the transformer to read the current.
There is no need to run currents over that distance. If the shunt is
located at the motor, then 49.999 amps go thru the shunt, and only 1
mA (assuming a 1 mA meter movement) has to travel remotely to the
meter. If the meter is insulated and the wiring to the meter is
capable of handling the voltage, then there is no problem because the
I squared R voltage drop is negligible at that current. Just make
sure that the circuit is fused with low current fuses at the shunt.
The transformer solution does have the advantage of isolation, so it's
a more attractive, even tho much more expensive, solution.
--
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###Got a Question about ELECTRONICS? Check HERE First:###
http://users.pandora.be/educypedia/electronics/databank.htm
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you add NOSPAM in the
Subject: line with other stuff. alondra101 <at> hotmail.com
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it:
http://physics.nist.gov/cuu/Units/binary.html
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