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Anonymous Poster #1

# Design of 11 kV Line

06/25/2012 2:53 PM

I am new to Design of overhead transmission lines.

I need help in finding out span length of 11 KV line having ACSR DOG on 9 mtr poles on plain terrain?

What must be the parameters involved in designing?

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Anonymous Poster #2
#1

### Re: Design of 11 KV line

06/25/2012 3:04 PM

You are responsible for the SAFE installation of 11 KV overhead lines and you don't have a clue how to do it?

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#2

### Re: Design of 11 KV line

06/25/2012 3:34 PM

Have you read the (American?) standards relating to the design and errection of these lines?

Have you looked at Overhead High Voltage Transmission Line Design application notes and theory available for free on the internet?

These are good places to help further your education, and I would say that both are mandatory if you want to get the correct (and country and application-specific) answer.

Hint- you will also need to know the operating temperature/load of the lines and the ambient temperatures as this will effect line droop (some lines companies want to overrun the lines for sort periods rather than using larger conductors).

Jack - Been helping consultants for, well years. Disturbingly this is not the dumbest thing a fully qualified and experienced power consultant has ever asked me.

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#3

### Re: Design of 11 KV line

06/25/2012 3:37 PM

Quote "I am new to Design of overhead transmission lines."

To begin you can use the correct terminology. If the line is 11 kv, it is not a transmission line. It is a distribution line. Distribution lines generally will be 2.4 kv up to 35 kv. You will need to determine the load to be place on the line so you can choose a conductor size. Distance will be a factor. The area you live in will dictate some of the requirements such as wind loading, sag, ice loading, tension and other requirements. Pole class and height will need to be determined along with conductor sag. I have listed some of the information you will need. So to begin, Google Design of overhead distribution lines and have a go at it. You will need some one with experience to assist you. Good luck.

There may be some online software to help with the calculations.
It usually takes years of experience to do this. I am all ways amazed that people think one can just do this magnitude of design without putting the years of work to learn the process

1.1 The Conductor profile Parabola vs Catenary

1.2 Sag

1.3 Slack

1.4 Factors that affect conductor tension

1.5 Multiple Span tension calculations - ruling Span

1.6 Sag tension calculations

1.7 Span ratios

1.8 Wind Span

1.9 Weight Span

2.0 Conductor Size

2.1 Pole Hardware such as type of cross arms.

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#4

### Re: Design of 11 KV line

06/26/2012 3:24 AM

First class answer to a scary question. Hopefully he sees sense and gets this line designed properly.

You would have lost one mark for Volts though. Always big V. kV etc.

Advice given on behalf of a departed friend.

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Location: Maine, USA
Posts: 2168
#5

### Re: Design of 11 kV Line

06/26/2012 9:42 AM

What I was talking about here

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#6

### Re: Design of 11 kV Line

06/26/2012 7:05 PM

There's An App For That

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#7

### Re: Design of 11 kV Line

06/28/2012 4:44 AM

wooden pole or concrete pole ?

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