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.
CPC 100 + CP CU1
The main unit CPC 100 generates the frequency variable test current and measures current and voltage by applying digital filtering for high accuracy. The complex loop impedance is then calculated accordingly.
The CP CU1 provides galvanic isolation between the line under test and the CPC 100 as well as impedance matching for short and long lines.