This detailed course provides a comprehensive understanding of high-voltage systems design, insulation coordination, electrical stress analysis, maintenance practices, and testing methodologies that underpin modern power infrastructure. Participants will gain practical and theoretical knowledge of high-voltage generation, measurement, and testing including both AC and DC systems, while learning how to detect insulation breakdown, partial discharge, corona effects, and other degradation mechanisms that impact system longevity. Through real-world case studies, delegates will explore preventive and predictive maintenance approaches, advanced testing tools, and the integration of digital diagnostics in high-voltage asset management.