Test stand for research on operation processes of thyristor and transistor reversible converters of AC locomotives in traction mode on the first control band

The paper deals with construction of a test stand for research on operation processes of thyristor and transistor reversible converters of AC locomotive in traction mode. Stand can implement two examples of structure diagrams of reversible converters - based on thyristors and transistors with engineering specifications provided. Each diagram presents elements of electrical and mechanical equipment along with explanation of their functions. It is described how thyristor and transistor converters operate as rectifiers (AC locomotive traction mode) on the first control band that differs in processes from the higher (second and third) bands. The paper presents oscillograph records of converter operation processes as curves of current and voltage on the primary coil and in rectified load current circuit (traction motor); their comparison is also given. From the results of comparative tests of thyristor and transistor converters operating as rectifier on the first control band we obtained experimental dependencies of locomotive power factor on voltage alteration in the first band. The paper gives comparative evaluation of energy performance of converter operation on the first control band through measuring its power factor for half (0.5) and full (1.0) values of the first band voltage.