An approach by means of mathematical logic to the switching of power-system networks

An introductory account is given of the way in which constraints to be imposed on the operation of a power system may be represented by symbols and equations of the kind used in mathematical logic. It is shown how such equations may be manipulated and interpreted in the form of interconnected elements referred to as `logical gates¿. This provides a basis for ensuring that the constraints are satisfied and provides a method for the safe operation of many types of system. The possibilities are illustrated by two simple examples, namely the interlocking of a double-busbar substation and the control of an auto-reclose circuit-breaker where a delay before reclose is to depend upon the type of fault. The possibility is discussed of the application of this type of switching control to a larger section of a power system. A routine procedure is proposed for formulating the control constraints, manipulating the resulting logical equations and then translating them into the logical control network. It is indicated how the solution of more complicated problems on these lines would result in the use of assemblies of logical elements somewhat analogous to those required in a general-purpose digital computer. It is therefore suggested that a special-purpose digital control computer could be developed for system switching based on the principles of this paper.