typical transmission line parameters 2

[aicon]

has anybody got a ready reference to typical transmission line parameters e.g. for given voltage and current rating I want to get resistance, reactance etc.

 

[Bung]

Most good power systems textbooks have some figures - Stevenson, Weedy, and of course the old Westinghouse T&D book.

R depends on wire size and hence current carrying capacity, and X on wire spacing and hnce voltage level.



Bung
Life is non-linear...

 

[SidiropoulosM]

Exact values can be calculated based on the conductor size and voltage level of your line. Also, the number of bundles per phase is important. If you just need some general realistic values by voltage level, here they are:

138 kv lines
Resistance = 0.1 - 0.25 ohms/mile
Reactance = 0.60 ohms/mile
Susceptance = 4.5 micro-mhos/mile

230 kv lines
Resistance = 0.05 - 0.1 ohms/mile
Reactance = 0.50 ohms/mile
Susceptance = 5.5 micro-mhos/mile

345 kv lines
Resistance = 0.03 - 0.05 ohms/mile
Reactance = 0.40 ohms/mile
Susceptance = 6.0 micro-mhos/mile

500 kv lines
Resistance = 0.02 - 0.04 ohms/mile
Reactance = 0.30 ohms/mile
Susceptance = 6.5 micro-mhos/mile

 

[aicon]

thanks for your responses, they are helpful. However I should have explained a little more, I am setting some power system problems for engineering students and I wanted to do exercises in comparing supply options without going into detail parameter calculations. What I would like are examples such as the r,x b, for a "standard" double circuit twin zebra 220kV line, or say a single circuit 110kV single wolf and similar for lower voltages. I have had it mind that there is a list of these for preliminary system planning studies but I have not found it yet.

Thanks again.

 

[SidiropoulosM]

Aicon, you don't need to do any calculations. For the purposes of your study I would recommend the parameters shown in my post above, for 138 kv and 230 kv lines.