Failure Mode Analysis and Benchmark Testing for HV Cables

This technical report discusses the critical aspects of failure mode analysis and benchmarking in high voltage (HV) cable testing. It begins by outlining the various failure modes associated with HV cables, including insulation deterioration, moisture ingress, and thermal runaway, which can occur at different stages of the asset lifecycle such as manufacturing, commissioning, and operation. The report emphasizes the importance of diagnostic commissioning tests to identify defects early in the operational life of HV cables. It presents findings from a 2024 study that highlights workmanship defects as the leading cause of HV failures. The report further details the commissioning benchmark testing process, which includes various tests like VLF withstand and partial discharge testing, aimed at providing comprehensive diagnostic data. This data is essential for long-term health forecasting and risk management of HV cables, enabling asset owners to develop effective maintenance and intervention plans.