Insulation Assessment Using Non-Invasive Techniques

Abel González Gómez and Swapnil Marathe, MeggerCover Story, Spring 2023 Cover Story

The status of the insulation in a rotating machine can be evaluated using various testing techniques. Static tests are performed while the motor is disconnected from the system, typically during manufacturing, commissioning, maintenance, or repairs. The goal of a static test is to provide an accurate picture of the machine’s electrical characteristics. Static tests can often be performed from the …

Practical Non-Invasive Partial Discharge Cable Testing

William G. Higinbotham, EA Technology, LLCIndustry Topics, Spring 2021 Industry Topics

Partial discharge (PD) is a poorly understood phenomenon that can cause catastrophic failure of electrical assets. It can exist at initial commissioning or occur only after decades of use. The dictionary defines partial discharge as: a flashover of part of the insulation system due to a localized electric field greater than the dielectric withstand capability of that part where the …

Spring 2023

Spring 2023 Cover StoryInsulation Assessment Using Non-Invasive TechniquesFeatured StoriesWhat Does Insulation Thermal Class Mean for Electrical Machines?How hot is too hot? Motors and transformers have maximum operating conditions, but can I exceed those ratings on occasion and…Kevin Alewine, Shermco IndustriesElectromagnetic Imperfection Measurements for Stator Core Condition AssessmentThe stator core of a rotating machine is composed of multiple stacked layers to …