Thermal imaging has for years served as a practical and cost-effective means of assessing the condition of surge arresters. But comparatively little effort has been made to determine what constitutes a ‘healthy’ versus a ‘suspect’ surface temperature profile.

The focus when it comes to components and equipment used on power grids has traditionally been on cost and performance.

Bushings are key components of HV substation equipment such as transformers and switchgear, allowing conductors to transfer energy from one insulating medium to another. Most typically, this is from an oil or SF6 insulation environment to air.

The resistance of the polymeric housed surge arrester is a metal oxide semiconductor non-linear resistance with zinc oxide as the main component. When the voltage applied across the resistor is less than the varistor voltage, the varistor assumes a high resistance state. If the resistance is connect

Not long ago, a HV cable termination operating in a Mediterranean country experienced catastrophic failure, sending high velocity porcelain shards in all directions.

Energias de Portugal-Distribuição, the main Portuguese DSO, has worked on best practice to restore power in emergency situations and to minimize duration of resulting outages.