Advantages of Steinmetz Circuit Theory Over Schelkunoff Transfer Impedance Theory

This paper presents induced voltage measurement results along a conductor pair inside a 4.5", 9-m-long galvanized steel tube, with an intermediate screwed joint. The excitation was done by an external parallel conductor where a 60-Hz current flows, followed by an impulsive current (5 kA, 8/20 mus). Some measurements with the external joint short-circuited cast a great doubt about the validity of all Schelkunoff transfer impedance concept. The paper focuses also the recommended calculation procedures using Circuit Theory. This paper also shows that there are strong evidences that the classical Maxwell equations were developed to represent wireless propagation such as light and wireless communication. The paper suggests as well the convenience of a deeper verification on the validity of applying Maxwell equations to solve metallic circuit problems.