765 kV EGLA: Design, Testing & Installation (Video)

A main challenge in EGLA configurations is correctly dimensioning the gap - a combination of gap distance and electrode arrangement. Minimum gap distance is defined by the line's switching overvoltage factor. Maximum gap distance is derived by lightning impulse withstand voltage of the insulators to be protected in parallel to the EGLA. Dimensioning gap distance therefore represents coordination of lightning and switching overvoltages and is more ambitious at higher system voltages, such as 765 kV. Read More >

Developing Global Consensus: IEEE Standard 1820TM, Guide on Selection of T&D Insulators

Power system insulators are selected to withstand a range of outdoor conditions, providing durability that exceeds a century and low probability of flashover. Nonetheless, there are special considerations that affect application of components such as insulators, surge arresters, bushings and live-line tools in 'cold weather conditions', defined here as ambient temperature < 0°C. Read More >


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