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Calculate correctly, live long!

- Loads, climatic conditions. Reference combinations of conditions
- Permissible tension for wires’ stretching
- Basic equations for stresses in wires’ materials, their sag and lengths in spans
- Tension in the wire material at changing climatic conditions (equation of the wire state)
- Source conditions for mechanical calculation of wires
- Mechanical calculation of wires (manually)
- Calculating the equation of the wire state on slide-rule

- Preparing a pattern for spotting of supports on the line profile and their sag at different temperatures
- Ground wire, optical ground-wire cable. Defining the tension (“manually” and explanations for the programs)
- Calculation of overhead lines’ crossings with engineering objects and natural obstacles (“manually” and explanations for the program)
- Calculating mounting stress and sag (“manually” and explanations for the program)

Upon the requests of our customers, the site includes the basic theoretical data on mechanical calculation of wires, cords of overhead power transmission lines and explanations for the corresponding and other programs. To make these data more accessible, the site does not provide the extracts from books, but from the lectures, written down in Novosibirsk Electrotechnical Institute (NETI, Novosibirsk State Technical University, NSTU) in 1971-72ss.

The lectures were given by a great specialist, candidate of technical science, Nazarenkova G.A. Of course, the lectures were comprised when the old Electric Installation Regulations (EIR) were effective, but the physics of these phenomena remained the same. New EIR include updated reference climatic conditions, as well as coefficients of correction influencing the source data for calculation.

Any other “torsion fiber, catenary” besides wires and cords of power transmission lines could be calculated using this methodology. The basic condition is the source data for calculation. Self-supporting insulated cables or fiber optic cables have their own characteristics that should be used for calculation.

The theory of mechanical calculation of self-supported communication cables (USA) is presented by Mr. Christian Militaru at Symposium IWC, 1999, ("Stress-Strain, Creep, and Temperature Dependency of ADSS (All Dielectric Self Supporting) Cable's Sag & Tension Calculation, Cristian Militaru, lcoa Fujikura Ltd., Spartanburg, SC" International Wire & Cable Symposium Proceedings 1999 стр. 605-613.).

You can download the metodology for calculating self-supporting communication cables here.

We compared the mechanical calculation of a self-supporting optical communication by foreign ADOC4 program (the calculation is performed by the cable's manufacturer) and by LineMech program created according to the methodology described on this site. There was no difference.