FIELD: electrified railway transport; electrical design of ac traction networks. SUBSTANCE: traction circuit is checked for no-load condition by relative content of third current harmonic and unknown current is calculated using known values of power and voltage. Analytical relations for mean values of equalizing current and its phase are given in description of invention. Method is implemented without limiting traffic conditions. Desired measurements can be entrusted to operating personnel. EFFECT: facilitated procedure; improved accuracy of determining equalizing current. 2 cl, 1 dwg
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