1887

Directives Concerning the Protection of Telecommunication Lines Against Harmful Effects from Electric Power and Electrified Railway Lines. Volume V, 2008 Edition

Inducing Currents and Voltages in Power Transmission and Distribution Systems

image of Directives Concerning the Protection of Telecommunication Lines Against Harmful Effects from Electric Power and Electrified Railway Lines. Volume V, 2008 Edition

The Directives provide a comprehensive description of electromagnetic effects due to the close proximity of telecommunication lines to power and electrified railway systems. Such effects may result in danger to personnel, damage to telecommunication equipment, deterioration of telecommunication transmission quality or disturbance of signalling. Volume V: "Inducing currents and voltages in power transmission and distribution systems" describes balanced and unbalanced power systems in normal operation and under fault conditions.

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EPR and current dissipation of tower footings along a transposed transmission line under normal operation

Due to the asymmetrical (not triangular) arrangement of the phase conductors, the series impedance of a HV transmission line is not the same for each of the three phases. Under balanced load conditions, this impedance asymmetry causes voltage unbalance to appear on the receiving end of the line. For long lines (more than 50 km typically), the voltage unbalance may exceed permissible limits. To solve this problem, phase conductors are transposed at regular intervals, i.e. a main transposition section is equally subdivided into three transposition sub-sections, which are separated by a transposition tower.

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