Videos

Insulator Corona Cage Test Corona discharge activity can cause damage to polymer insulators that can lead to failure. While no corona is ideal, it may not be practical to consider all circumstances that result in corona activity. However, the design of the insulator end fitting may affect how corona interacts with the rubber and this video describes a test designed to investigate how much, if any, affect there is.

Smal-scale Aging Chamber Test When the rubber for polymer insulators is qualified, it is often tested in square samples that are cured differently than is done in the manufacturing process. This has the result of rubber being used on insulators that can be suscpetpible to corona damage. EPRI developed a small-scale aging chamber that tests assembled insulator samples with the rubber having been through a typical manufacturing process. This video describes how this test is setup and how it is run.