Five Years´ Experience on the Consolidated Edison System with Protection of Turbine Generators and Boilers by Automatic Tripping

Since the authors´ paper, presented in 1953, on the subject of protection of turbine generators and boilers by automatic tripping, the Consolidated Edison Company has had 5 years´ experience with three 200-mw (megawatt) units so protected. This paper relates the actual shutdowns experiened as a result of the automatic trip system´s functioning. Troubles, design changes, and additions incorporated in the protection system on new units now being installed are also discussed.