# Transmission line

1. Nov 27, 2013

### onceinalifetim

Hello

i would like to know what is the different between 300km and 150km in transmission line..
thanks

2. Nov 27, 2013

### Staff: Mentor

What kind of characteristics are you asking about? Line loss? There is a practical limit to the length of a transmission line, substations and ties affect transmission lines as well.

Could you please be a lot more specific? example: How many Kv? What are you trying to learn about?
This will help you to think about what you want to ask:
http://en.wikipedia.org/wiki/Electric_power_transmission

[story]
As a side note: Rio Grande Electric Cooperative has the single longest transmission line in the US (As of 1995).
It was nicknamed 'Old Leaky'. If I remember correctly, it had line losses on the order of 15%. Rio Grande, to my knowledge, has never done well financially. I think the line has something to do with it. With the measurement of customers per mile of line, it was also awful - about .5 customer meters per mile. Most meters were lumped in a few small developments in the Big Bend Park.
[/story]

Last edited: Nov 27, 2013
3. Nov 27, 2013

### onceinalifetim

okay...

I'm not asking for line loss, I'm asking like what is the main different between both of the lines..
380v...

4. Nov 27, 2013

### Staff: Mentor

None, except increased line loss and side effects like cost of maintenance. Line loss is a function of distance, AC vs DC, conductor types, coronal loss, voltage, etc. Line length(resistance / impedance) is the primary factor after AC/DC and voltage.

So, your question, as asked, makes little sense to me. Unless you are referring to impedance or resistance....

Since you refuse to consider line loss (impedance/resistance, etc), the answer is: no difference.

Is this a homework question of some sort?

Last edited: Nov 27, 2013
5. Nov 27, 2013

### davenn

since you don't want to consider the electrical differences

the difference in this context is 150 km :tongue:

Dave

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