How can I calculate the positive, negative and zero impedance values 3

[anna8]

If I have got the standard manufactures data for a cable. How can I calculate the positive, negative and zero impedance values?

Typical data given includes:

Maximum AC resistance - µOhms/m
Reactance - µOhms/m
Impedance - µOhms/m
Maximum capacitance - pF/m


Any help would be much appreciated

Thanks

 

[DougMSOE]

Strongly suggest you take a look at the kerite cable web site. The last time I looked the +,-,0 sequence data was given for each cable.
If you need to actually calculate these valuec then look for a good book on symetrical components.

 

[dpc]

The positive and negative sequence impedances of a cable are the same. The zero sequence will depend on the cable and shield configuration.

You should be able to get this information from the cable supplier. Otherwise, you will need to refer to reference text on developing sequence impedances of a cable.

IEEE Red Book or Buff Book should be of help.

 

[jwerthman]

This information is usually available from the cable supplier. If you really want to calculate it yourself, an excellent reference is the Westinghouse "Electrical Transmission and Distribution Reference Book."