A Simplified Method of Analyzing Short-Circuit Problems

This paper presents the theoretical basis for a theorem by which the practical analysis and visualization of short-circuit phenomena can be greatly simplified. The theorem follows from the approximation of neglecting resistance in the application of Kirchhoff´s Law to closed circuits. Thus in any problem of short circuits in which the effect of resistance is negligible in the initial moment, and this includes many of them, the theorem applies. It is: If the resistance of a closed circuit is zero, then the algebraic sum of the magnetic linkages of the circuit must remain constant. Illustrative examples are given, including the transformer, the single-phase and polyphase alternator, and the induction motor.