DEVICE FOR INSPECTION OF ELECTRICAL EQUIPMENT OF SUBWAY STATIONS Russian patent published in 1994 - IPC

FIELD: systems for testing serviceability of electric equipment of subway car. SUBSTANCE: device has thyristor-pulse voltage regulator 17-18, inductive reactor 20, power diode 22, which is brought between contact circuit 16 and input of power circuit of car 1. Regulator 19 is controlled by means of control pulse formers 23, 24 and electron switch 26 when receiving signal from pulse-width modulator 25. Coefficient of filling of pulse cycle of the modulator may be changed by means of setting RC-circuit 30-31. Armature windings 2-5 of traction electric engines in car power circuit 1 are shunted by ancillary contactors 32, 33 and current detectors 34, 35. The latters control operation of electron switch 26 and voltage comparing element 37, which has output connected with reference voltage supply 38. Supply voltage is applied to winding 39 of the first control relay. Windings 40 and 41 of the second and the third control relays are connected to power supply through contacts 42, 43 and 44 and 45 of the first, the second and the third control relays are connected in parallel to capacitor 31 of setting RC-circuit. EFFECT: improved precision; improved reliability of operation. 1 dwg