high resistance in motor feed cable
high resistance in motor feed cable
(OP)
I have discovered a feed cable (4 core, 3 phase and neutral)that supplies a panel from which several motors are fed from, having a resistance on each core of average 35 ohms. Normally a high resistance would reduce the current, but would it increase it to provide the motors with sufficient power?





RE: high resistance in motor feed cable
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: high resistance in motor feed cable
RE: high resistance in motor feed cable
With this area, the cables probably carry around 100 A. That would produce a voltage drop equal to 350 volts in a 35 ohm cable. Are you really sure that your measurements are OK?
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: high resistance in motor feed cable
RE: high resistance in motor feed cable
Have you tried with a different meter? How are you checking the resistance? Are cables disconnected at both ends?
Rafiq Bulsara
http://www.srengineersct.com
RE: high resistance in motor feed cable
Muthu
www.edison.co.in
RE: high resistance in motor feed cable
To take Gunnar's example one step further:
100 Amps x 350 Volts drop = 35000Watts or 35 kW of waste heat. The point is, that much resistance (35 Ohms) in a feeder will generate enough heat to be be noticeable and will lead to rapid complete failure.
Metering issues are much more likely.
Bill
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"Why not the best?"
Jimmy Carter
RE: high resistance in motor feed cable
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: high resistance in motor feed cable
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...