In this guide, the field testing methodology and techniques are presented for measuring electrical parameters of AC transmission lines. The topics will include safety precautions; requirements for measuring instruments; measurement of induced voltage and current; phase verification and insulation resistance measurement; DC resistance measurement; off-line parameter measurement of symmetrical transmission line; off-line parameter measurement of asymmetrical transmission lines; eliminating power frequency interference during off-line measurement; zero-sequence parameter measurement with adjacent lines in operation and on-line parameter measurement of transmission lines.
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