Partial Discharge Testing Frequency for HV Assets

This case study discusses the importance of partial discharge (PD) testing in assessing the health of high voltage (HV) assets. It outlines the challenges in establishing an effective testing schedule that balances the need for high-quality data with timely fault identification to prevent failures. The document examines the P-F curve, which illustrates the progression from potential failure to functional failure, and how it can guide optimal testing frequency. It details three types of PD: internal, surface, and corona, explaining their characteristics and implications for asset management. The case studies presented highlight the consequences of varying testing intervals and the effectiveness of permanent monitoring systems. The analysis emphasizes that while periodic testing can identify defects, continuous monitoring provides a more reliable means of early detection, allowing for timely interventions. Ultimately, the study advocates for a tailored approach to testing intervals based on asset risk and criticality, ensuring that maintenance strategies are both effective and economically viable.