METHOD AND EQUIPMENT OF ELECTRIC ENERGY SUPPLYING STAND FOR CHECKING PASSENGER CARS WITH FOUR OUTPUT VOLTAGES

The invention relates to a method and an equipment for supplying electric energy for checking passenger and freight cars . According to the invention, the method uses, for supplying, a three-phased nominal voltage of 3x400 Vca and 50 Hz or a higher three-phased voltage, but having the same nominal frequency, voltage which is rectified in a three-phased bridge with diodes, being filtered with a power condenser and then applied to a three-phased inverter, the output voltage being adapted by a three-phased filter LC, chosen so as the three-phased inverter functions with different currents on the three phases, then being applied to a transformer with primary winding in two star connections and secondary winding in star/triangle connection, so that the transformer discharges an adjustable voltage at the output, the adjustment of the values thereof is obtained by modifying the connections with adequately controlled switches or contactors and by controlling the transistors of the three-phased inverter, the command logic being coordinated by a block of adjusting, diagnosing and informing, a programming block and a driver. The equipment used for applying the method consists of a three-phased switch (1), three thermal fuses (2, 3 and 4), a three-phased rectifier (5) with diodes, a condenser (6) parallelly connected with a discharge resistor (7), a three-phased inverter (8), a three-phased filter made with inductance devices (9) and condensers (10), a three-phased transformer (11), some switches (12, 13, 14, 15, 21 and 22), a three-phased rectifier bridge (20) with diodes and some transducers (15 and 16), for control and adjustment, the equipment being provided with a block (24) for adjusting, diagnosing and informing made with micro-processors, a programming block (25) and a driver (23). Invenţia se referă la o metodă şi un echipament de alimentare cu energie electrică, pentru verificarea vagoanelor de călători şi marfă. Metoda conform invenţiei utilizează pentru alimentare o tensiune trifazată nominală de 3 x 400 Vca şi 50 Hz, sau o tensiune trifazată mai mare, dar având aceeaşi frecvenţă nominală, tensiune care este redresată într-o punte trifazată cu diode, fiind filtrată cu un condensator de putere şi apoi aplicată unui invertor trifazat, tensiunea de ieşire fiind adaptată de un filtru LC trifazat, ales astfel încât invertorul trifazat să funcţioneze cu curenţi diferiţi pe cele trei faze, fiind aplicată apoi unui transformator cu înfăşurare primară în două conex