Impedance Measurement on Power Cables

For the determination of parameters for your single circuit line, you inject a test current into several different test loops. Each of the loops represents a possible fault scenario. Thereby, the measured loop impedances equal the loop impedances, which the connected protection device would determine during a real fault on the line. Based on these loop impedances, your required single circuit line's parameters are finally calculated.

Conventional test methods use high-power injection at mains frequency for suppression of interferences. You can freely select the frequency with modern systems: By injecting a signal with a frequency higher or lower than the mains frequency and applying a steep filter, you effectively suppress the interference.

Expert recommends

CPC 100 + CP CU1

With the CPC 100 + CP CU1, you can accurately determine the sequence impedance and K-factor setting needed for the distance protection relay on overhead power lines and cables.

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