This report deals with the error and null voltage introduced into a control system by the presence of an unbalanced connecting cable. It is proved that under ordinary conditions (see paragraph 7) a lumped-impedance network can replace the distributed impedance of the cable. General expressions are derived for the error and null-voltage ratio in terms of the cable admittances and in terms of the impedances of the transmitter and transformer. The expressions are simplified for the cases of pure reactive loads or pure resistive loads, and it is shown that the error is dependent upon only the unbalance of the load and not upon the magnitude of the resistances or capacitances.
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