Considerations necessary for the design of a total control system for the improvement of the reliability of the generation-transmission system are discussed. The control system is made of automatic functions, human participation, and an information system.In the first part of the paper the framework of the design is established and the basic overall strategy for maintaining reliability is described. The second part describes the thinking and the work being done at Cleveland Electric Illuminating (CEI) Company for the practical implementation of the design concepts on the CEI system. The primary purpose is to contribute an organized approach to the solution of the problem of control for improved reliability. The aim is to be as comprehensive as possible so that all of the requirements within the framework of the approach are covered even though not all of the solutions have as yet been formulated. In the process of describing how the requirements may be met, major difficulties are pointed out as an aid in identifying areas where research in depth would be of value. Mathematical formulations are not used, but a discussion of the mathematical treatment of some aspects of the control system will be written in a separate paper.

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