Part A - EIA 400 kV OHTL Stp - мепсо а.д.

Environmental Impact Assessment Study for 400 kV OHL SS Stip – Macedonian-Serbian Border• One system• Horizontal connection of two conductors per phase• Two symmetrically positioned protective wires• Steel-bar hot zinc-coated construction• Use of insulator chain with glass / porcelain insulation units• Persistant in various climate conditions• Esthetically acceptable profile with good height - width rationIn addition to the aforementioned, the basic height of each type of tower must also meet thefollowing conditions:oooooall working conditionsaverage spanrequirements for safe distances and heightlimited tension phase conductors and protective wiresallowed (anticipated) non-elastic stretching of phase conductorsThe electric design of the “heads” of the towers and the established safe distances mustensure safe operation in all working climate conditions, in relation to the used phaseconductors, protective wires and insulator chains and for the designed, average andgravitation spans.The static calculation and dimensioning of towers must be made based on the theory ofelasticity for spatial constructions, in compliance with the accepted methodology for theprescribed single and combined common and additional loads and relevant safetycoeficients.In order to ensure easier and safer operation of the authorized personnel during theconstrction and installation of equipment, as well as during the activities for maintenance,stairs must be placed on both forks of the tower.The standard marking of the overhead power transmission line includes the following:• Warning table and signs in the appropriate form• Tables for marking of the phases with designations 0,4 or 8 that are positioned on theangle-tension towers, above the phase conductors according to the defined order.• Tables for noticing from air with the tower number, which are set at one of the twopeaks.In addition to these standards, with the aim of increasing the visibility of the power line bothduring the day and night, it is necessary to mark it in defined places (painting the towers inwhite colour and red strips, establishing signal balls on the protection wires and installation of"Balisor" lighting balls on the phase conductors.44