MATHEMATIC SIMULATION OF TRANSIENT PROCESS IN A.C. – SYSTEM 'ELECTRIC TRACTION NETWORK – LOCOMOTIVE' 1. SWITCH ON LOCOMOTIVE’S POWER CONVERTER IN 'FREE PLAY' MODE; PARAMETERS ESTIMATION

In the article the electric circuit of substitution and mathematical model of the system of alternating current «traction substation − traction mains − electric locomotive DS 3» at switching its power transformer on in the idle mode are presented. Numerical determinations of parameters of traction substation, rails, contact network and transformer are executed; in so doing a special attention is paid to the estimation of dispersion inductance for the primary winding of transformer.