power cable model

[[email protected]]

Hi i want to model the power supply cable of length 1-2m length. The
cables can be twistes or come in parallel. I prefer doing a simple
lumped circuit model. Is there any reference suggesting the methods to
model and how to measure the parameters experimentally?
thanks
kristo

 

[Wimpie]

Hi i want to model the power supply cable of length 1-2m length. The
cables can be twistes or come in parallel. I prefer doing a simple
lumped circuit model. Is there any reference suggesting the methods to
model and how to measure the parameters experimentally?
thanks
kristo

Hello Kristo,

For modeling your supply cable, you should know the geometry and the
frequency band.

When the geometry of your supply cable is a parallel pair with plastic
insulation, or coaxial structure, you can consider it as a
transmission line. Typical impedances are around 120 Ohms (for
parallel wire), with 0.8 velocity factor (with respect to speed of
light).

From here, based on the velocity factor and characteristic impedance,
you can calculate the inductance/m and capacitance/m. Depending on the
highest frequency of interest, you can convert the distributed
components to lumped series inductors and parallel capacitors. Choose
your inductance so that the "length" of one segment is below
0.15lambda.

You may add losses by calculating the skin depth and resistance/m for
the frequency of interest.

Hope this will help you,

Wim
PA3DJS
www.tetech.nl

 

[Martin Griffith]

Keep in mind that you may also have to model the premisis wiring back to
the service entrance and the utility side wiring with some sort of
infinite bus plus lumped impedance model. (Something the audiophools
with their pricey power cords seem to forget about).

http://soundmindaudio.com/index.php?option=com_content&task=view&id=25&Itemid=1


martin

 

[Paul Hovnanian P.E.]

Hi i want to model the power supply cable of length 1-2m length. The
cables can be twistes or come in parallel. I prefer doing a simple
lumped circuit model. Is there any reference suggesting the methods to
model and how to measure the parameters experimentally?
thanks
kristo

Keep in mind that you may also have to model the premisis wiring back to
the service entrance and the utility side wiring with some sort of
infinite bus plus lumped impedance model. (Something the audiophools
with their pricey power cords seem to forget about).