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Сalculation of crossings between overhead communication and power trasmission lines and engeneering objects and natural obstacles


MS PowerPoint Presentation

LineS - program package for designing overhead power and communication lines (OHL, FOCL OHL, FOCL). The calculating part of the program has been used since 1985 beginning with SM-4 EVM (System of mini-computers developed in USSR in 1970-80s).

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LineCross program is designated for calculating the clearances (vertical distances) of communication and power transmission lines’ crossings with engineering objects and natural obstacles.

Additionally, it calculates the length of the wire in the span considering sag and the tension at points of wire attachment taking into account the differences in height of attachment. These values could be calculated for any hypothetical crossings for in problematic spans.

The theory for calculating the crossings"manually" and explanations for the program are presented on “Theory and Practice” page.
The calculation is based on permissible tension method. The kernel of the program – full mechanical calculation.

Permissible tension (stresses) are justified by LineMech (LineMechCad) program «Mechanical calculation of wires, cords and self-supporting cables”.

According to 2.5.185 of EIR, the mechanical calculation of optical ground-wire cables, optical phase-wire cables, self-supporting optical cables should be done considering the reference loads based on permissible tension method, following all other requirements both for wires and cords of overhead lines, see the section of EIR “Fiber optic communication lines on overhead lines”.


The user is given a warning in case the reliability coefficients to standard loads are used not according to 2.5.11 of EIR-7; in the source data they equal 1 by default.

The program allows performing calculations for new lines as well as for reconstructing using the requirements of both EIR-7 and earlier versions.

All the crossings (crossing spans with the list of crossed objects) of the designed overhead line could be saved to the source data of the program.

The program includes any variants of calculation: overcrossings, undercrossings, accounting the weight of insulator strings, calculation of breakdown modes.
When inputting for a crossed object the maximum temperature of the temperature for ice accumulation without wind, the program checks the largest sag.
If it is necessary to take into account the temperature of additional warming-up of wires due to electric current or sun radiation, the maximum temperature should be corrected.

The data from instrumental measurements, longitudinal profile of the line and marks of crossed objects are used to perform the calculations. The data of precise visual investigations could be used as well.

Climatic conditions, climatic parameters specifications and reliability coefficients could be imported from source data files for LineMech (LineMechCad) program.

The program could be used for any climatic zone.

Besides the description of the required source data, Help file for the program gives recommendation on the application of calculation results and their place in each particular project.

The calculation results are presented in the form of Excel table, containing all the source data for the sake of control, including reference data to be placed in justifying materials and original calculations of the project, as well as the table for exporting the results of crossings calculations on the crossing draft.
It is noted, that project organizations prefer placing on the draft (detailed) of the crossing the entire results of the calculation with the source data, which indicates to the customer the completeness of the development.
The reference catalog of wires, cords and self-supporting cables could be edited and added to. When using non-standard self-supporting cables of fiber optic communication lines (FOCL), it is necessary to ask their characteristics from their manufacturer for each particular project.

Besides the calculation of the clearance as such, the program prepares the register of crossed objects (facilities, obstacles), which could be corrected and included by the user into the project documentation.

LineCrosscad version of the program drafts the crossing selected from the list of input crossings in AutoCad or any other graphical format supporting dxf exchange format. The default scale suggested for the draft by the program is 2000/200.

The draft input to AutoCad is the foundation for the layout plan (detailed) of the crossing.

For more details see the User Guide for the program (Program description. Application.) which could be downloaded along with the demo version.