Sidedischarging

Sidedischarging refers to an unwanted emission of energy from the side of a high-voltage insulator. This phenomenon typically occurs when the electrical field distribution on the insulator surface becomes distorted, leading to a concentration of stress at a specific point. Instead of the intended uniform discharge across the entire insulator surface, the electric field strength at one side exceeds the dielectric strength of the surrounding medium, causing a localized breakdown and a visible spark or arc.

Several factors can contribute to sidedischarging. Surface contamination, such as dirt, salt, or moisture, can create conductive paths that alter the electric field. Physical damage to the insulator, like cracks or erosion, can also create points of stress concentration. Furthermore, the design and geometry of the insulator itself, as well as the presence of nearby conductive objects, can influence the electric field distribution and potentially lead to sidedischarging.

The consequences of sidedischarging can range from minor inconveniences to significant operational problems. It can lead to audible noise and visible corona discharge, which may be mistaken for more serious faults. In more severe cases, repeated sidedischarging can cause erosion of the insulator material, reducing its lifespan and potentially leading to flashover and power system outages. Mitigation strategies involve proper insulator design, regular cleaning and maintenance, and careful consideration of the surrounding environment during installation.