1887

Directives Concerning the Protection of Telecommunication Lines Against Harmful Effects from Electric Power and Electrified Railway Lines. Volume II

Calculating Induced Voltages and Currents in Practical Cases

image of Directives Concerning the Protection of Telecommunication Lines Against Harmful Effects from Electric Power and Electrified Railway Lines. Volume II

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 to disturbance of signalling. Volume II - Calculating induced voltages and currents in practical cases - describes the methods for evaluating voltages and currents resulting from capacitive, inductive and conductive coupling in a variety of commonly-encountered situations.

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Calculation of Conductive Coupling

When a power system fault to earth occurs, some of the fault current returns via the earth, through the earth electrodes (e.g. that of the tower where the fault occurs and ground grid of a high voltage power station). The current through an earth electrode produces a potential difference between the electrode and remote earth. This potential difference is referred to as electrode (power station) ground potential rise (GPR). The area surrounding a high voltage earth electrode that is raised in potential is referred to as zone of GPR.

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