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Computational handbook for power line engineers
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).
2017 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The high voltage power network in Sweden consists mainly of overhead power lines, that

is conductors suspended in the air by supports. Ideally when projecting a power line, all

supports should be placed equidistantly and the conductors should be suspended at equal

height. When this is not applied, the support placement may have consequences, such as

uplifting forces in a support, which should be avoided. The objective of this thesis was to

investigate both what in uences the support placement, and what consequences that may

come out of it.

This was investigated using mainly analytical calculations on poles and conductors, but

was also implemented on a specic case. When solving the case, support placement and

FEM software were also used and compared with the analytical calculations.

It was found that the support placement is in uenced by both environmental factors; such

as terrain, obstacles and solidity of the ground, as well as how long spans that are possible

to construct. The span length is the distance between two nearby supports and is limited

by sag, that is the de ection of the conductors, and the strength of the supports.

The sag is dependent on the tension in the conductor, which is dependent on wind and

ice loads, temperature and creep; a permanent elongation that for certain materials occur

over time even if the load is constant. Since the sag will increase over time, and especially

at high temperatures, the distance between the conductors and the ground will decrease.

This extra de ection must be accounted for when designing the power line and determining

the span length.

When it comes to support designing, both bending and buckling should be accounted for.

The greatest loads the supports are in uenced by are transferred from the conductors,

and therefore are dependent of the span length. An analysis of buckling and bending as

function of span length was therefore conducted on non-guyed timber pole supports. It was

concluded that bending stresses; due to wind loads on the support and especially on the

conductors, are usually the critical aspect when designing standard power line supports.

Place, publisher, year, edition, pages
2017.
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-217480OAI: oai:DiVA.org:kth-217480DiVA: diva2:1156411
Subject / course
Solid Mechanics
Supervisors
Examiners
Available from: 2017-11-14 Created: 2017-11-13 Last updated: 2017-11-14Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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Output format
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