Transmission and Distribution

Guidance is provided for measuring the electric-field strength, ion-current density, conductivity, monopolar space-charge density, and net space-charge density in the vicinity of HVDC power lines, in converter substations, and in apparatus designed to simulate the HVDC power-line environment.

Guidelines are provided for evaluating and mitigating harmonic induction effects from high-voltage direct current (HVDC) lines on the adjacent telephone communication lines. Specifically, this guide presents methodology and approach for a) Determining the number of wireline communication circuits that will be affected by unacceptable interference and cost-effective remedial measures; and b) Computing interference levels that would result with various practical dc filter/smoothing reactor designs and the costs of these filters.