Entergy's Mayflower EHV substation tornado restoration

摘要

On April 27th, 2014, five tornadoes packing winds up to 200 miles per hour ripped through central Arkansas. Entergy's Mayflower EHV substation sustained a direct hit from one of the tornadoes registered as an EF4. Nearly 70% of the substation was destroyed. With summer load fast approaching, it was essential to return the substation to service as quickly as possible. This paper discusses a unique two phased approach to restoring this substation to normal. The first phase was a temporary solution that returned the substation to service by June 3rd, 2014; exactly 37 days after being destroyed. The second phase was the permanent solution that converted the existing 500KV ring bus to a breaker and a half arrangement. This construction occurred while the temporary solution was energized.