Field testing methodology and techniques are presented for measuring parameters for dc transmission lines and earth electrode lines are discussed in this guide. The topics addressed include the basic requirements of measurement, safety cautions, requirements for test instruments, testing induced voltage and current, verifying the polarity and testing insulation resistance, measuring dc resistance, measuring the impedance frequency characteristic, and various factors that can distort measurements.

The testing methods and techniques that are used for measuring electrical characteristics and parameters ofdc transmission lines and earth electrode lines include the following topics:a) Test safety precautions b) Measuring instrument requirements c) Induced-voltage and induced-current testing d) Polarity verification and insulation resistance testing e) Measurement of dc resistance f) Measurement of impedance frequency characteristics

The purpose of this guide is to present practical testing methods that may be used for measuring inducedvoltage and current, polarity, insulation resistance, dc resistance, and impedance frequency characteristics of dc transmission lines and earth electrode lines.