After-installation testing of very long HVAC submarine cables

According to IEC 62067, after-installation testing of HVAC land cables requires sinusoidal AC test voltages in the frequency range 20 – 300 Hz. Mobile resonant HVAC voltage test system proved as suited equipment to carry out after-installation tests of HVAC extruded cable systems. Due to weight limits in street transport, the test power of a single mobile resonant test system is limited, e.g. to 260kV, 80A. Depending on the actual AC test voltage level and on the capacitance of one phase of a three-phase HVAC cable system, the maximum single-phase cable length that can be tested with one mobile resonant test system is consequently limited as well. To overcome this limitation for ever increasing length of cable, resonant test system are put in parallel or – for very high test voltage levels…