What is the weakest area of insulation in a bushing typically from?

The weakest area of insulation in a bushing is typically found in the tap to ground section. This is due to the design and operational stresses that occur where the tap connection is made to the bushing. The tap area experiences higher electrical stress and is subject to potential moisture ingress, which can compromise the insulation integrity over time. Additionally, manufacturing variances in this area can further weaken its overall insulating properties compared to other sections of the bushing.

In contrast, other areas such as the base to ground or windings to bushing usually have a more robust insulation design intended to handle higher voltage levels and mechanical stresses. Core to ground is likewise engineered for durability and is not typically seen as the weakest point. Understanding these nuances is crucial for maintaining the reliability and safety of power transmission equipment.