Next generation offshore cable testing: resonant technology and TruePD in action

HIGHVOLT’s offshore RTS system sets a new standard for 66 kV cable testing. Designed for harsh offshore conditions, it ensures fast mobilization, safe operation and reliable PD detection. Built on decades of expertise and full offshore compliance, it secures grid stability from installation through long-term operation.

The design, installation and commissioning of offshore wind farms face several challenges for the inter-array grid. The continuously increasing power ratings of the individual wind turbines lead to increasing operating voltages (U_m) from 36 kV to 72.5 kV for the inter-array cables to reduce operating currents and therefore thermal losses.

As these cables are designed as high voltage cables and not as medium voltage, the after-installation cables should be
tested by resonant test systems (RTS) as defined in IEC 63026:2019 and CIGRE TB 841. Options for measuring partial discharges are also in focus now to keep grids stable for as long as possible.

As the market leader, HIGHVOLT has installed and successfully operated more than 260 RTS systems worldwide. Building on this experience, the company has developed a completely new RTS system specifically designed for offshore operations. Offshore conditions differ significantly from those of conventional onshore testing, requiring the system to be specially adapted for transportation and operation at sea.

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