Line Impedance Measurement

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.

Benefits of this solution

Extremely accurate solution

Conventional calculations of line impedance values are highly error-prone. By combining the CPC 100 and CP CU1, you can perform extremely accurate measurements of the sequence impedances.

Correct relay parameterization

The data provided allows you to set the distance relays precisely with impedance values and the calculated k-factor. This allows selective operation of the relay.

Variable frequency

The compact, lightweight system – the heaviest component weighs 29 kg / 64 lbs – can measure values at variable frequencies. Thus, the effects of power system frequency can be eliminated.

High level of safety

To protect you and your equipment, the CP CU1 comes with the CP GB1 grounding unit. This unit can divert currents of up to 30 kA if its voltage limit value is exceeded due to unexpected induced potentials on adjacent lines.

COMPANO 100 + CIB1

With the CIB1 accessory, COMPANO 100 enables efficient and safe impedance and screen current measurements on cables and short medium-voltage overhead lines. Automatic switching of measurement loops, only two cables, and an improved workflow greatly enhance efficiency. Its integrated safety functions and optimized wiring solution significantly boost personal safety, making it an ideal solution for operations and maintenance teams.