Transformer with Capacitive Load

Thread Starter

HighVoltage!

Joined Apr 28, 2014
118
I have a fairly simple question:

If I was to have a shorted cable thats 4/0, shielded cable through the secondary of a transformer...will that be considered a resistive load (Low resistance because of copper conductor) or capacitive load since its a cable?

The shield is open...only the conductor is shorted.
 

#12

Joined Nov 30, 2010
18,076
Did you wonder if I was talking about a capacitive resistor? As far as I know, they don't exist.
A resistor makes a resistive load. A resistor does not make a capacitive load or an inductive load unless you get into high frequencies where the shape and length of the wire gets involved with wavelength and parasitic amounts of inductance and capacitance. You said nothing about frequency, so I might still be wrong. Declare this as a gigahertz and all bets are off.
 

MaxHeadRoom

Joined Jul 18, 2013
19,006
Short circuit secondary that size smacks of a resistance welder!?
Where does the capacitance come in?
Max.
 

crutschow

Joined Mar 14, 2008
23,306
You have the low resistance of the shorted cable in parallel with the shield capacitance.
That effectively shorts the shield capacitance, so the transformer sees only the resistance of the cable.
 

#12

Joined Nov 30, 2010
18,076
in parallel with the shield capacitance
I have some doubts that an un-connected piece of metal is a capacitor of any sort. Did you miss the idea that the shield is not connected to anything or do I need my beliefs adjusted?

Edit: I'm afraid this discussion will run off into, "certain physical configurations and frequencies". Try to work with me in terms of power line frequencies and power frequency transformers.
 
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