What is the purpose of the 480VAC power source in an EHV breaker?

The purpose of the 480VAC power source in an Extra High Voltage (EHV) breaker primarily involves running air compressors and providing power to convenience outlets. This voltage level is commonly used in industrial settings for various heavy-duty applications, making it suitable for powering equipment, including air compressors which are often utilized for control and maintenance operations in substations.

Air compressors may be used to provide pneumatic pressure for operating mechanisms within the breaker or for other tools and equipment requiring compressed air. Additionally, convenience outlets supplied by 480VAC power can facilitate the use of smaller electrical devices and tools needed by maintenance personnel working in the substation.

This specific application of 480VAC emphasizes the operational requirements of substations where reliable and robust power sources are essential for both routine and emergency functioning of essential systems, ensuring that the EHV breakers operate effectively and safely.