Theoretical Investigation of Accidental Contact between Distribution Lines of Dissimilar Voltage

A theoretical study is presented of the consequences of accidental contact between conductors at different voltage levels. This study was done to complement previous experimental and simulation work [1] and confirmed the previous findings that the distribution transformer holds down the voltage at the point of contact to a value below the nominal lower voltage level. Two cases are examined (a) contact downstream and (b) contact upstream of the distribution transformer location. The theory is applied to some of the experimental and simulation cases examined in [1] and to other case studies.