Impedance measurement on double circuit lines
For accurate distance protection relay settings of double circuit lines, it is not only important to measure the sequence impedance but also the mutual coupling impedance.
By connecting the CPC 100 and CP CU1 to just one circuit, you can measure the mutual coupling of the double circuit line via a clever measurement protocol. You can also determine the required sequence impedance of the single circuit using the same measurement setup, in parallel.
The CPC 100 and CP CU1 system is able to perform measurements at variable frequencies, which also makes it a robust tool against noise from surrounding live parts or neighboring lines. In the case of unexpected electrical events on overhead transmission lines like lightning, the included CP GB1 protects you and your equipment.