Over the past decade, we’ve gained critical insights into partial discharge (PD), recognizing it as a real issue that can lead to catastrophic equipment failures. We’ve also developed on-line and off-line methods to detect PD. Yet many still find it unclear why partial discharge occurs and inconceivable that something as simple as a poorly positioned tie-wrap can bring down a data center. …

Partial discharge (PD) is a localized dielectric breakdown that only partially bridges the insulation between conductors. PD in transformers can be categorized into two types:  The continuous presence of PD activity in a transformer’s solid insulation during operation can lead to the degradation of surrounding materials and potentially result in a complete failure of the electrical insulation system over time. …