Critical considerations for utility/cogeneration inter tie protection scheme configuration

Special considerations must be given to protection systems for inter ties between cogeneration plants and existing host utility power systems. The considerations are reviewed in light of contemporary experience with mid size cogenerating plants. Typical inter tie configurations are deliberated with emphasis on implications on the design of relevant protection systems. Protection schemes are presented and evaluations to their advantages and disadvantages are given. The importance of examining the protection scheme requirements during the conceptual design stage of a cogenerating plant is demonstrated