Fault Protection for Three Phase Motors Case Study Solution The operation versatility of G&W Electric’s Viper ® -ST recloser provided an ideal solution. The Viper-ST permits single phase trip / three phase lockout operation. Programmed in this manner, the customer was able to use standard cycle speed time delays between shots for single phase faults. This capability permits the nonfault affected motors to stay in service by 'coasting through' the fast single phase reclose to maintain service to the pumps resulting in minimized downtime and increased revenue. An additional feature which attracted the customer to G&W Electric’s solution was the compatibility of the Viper-ST with the SEL 651-R control. The control was preferred by the customer because it offered Mirrored Bits TM *

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