EQUIPMENT WITH DIRECT CURRENT VARIATOR FOR DRIVING THE TROLLEYBUSES

According to the invention, the equipment with direct current variator for driving the trolleybuses with direct current motors comprises two ultrafast line safety fuses (1, 2) one for each phase, a radio noise filter consisting of two inductances (3, 4), one for each phase, a capacitor (5) parallelly mounted with an overvoltage protection element (6), a limiting contactor (7) serially connected with a limiting resistor (8) and two main contactors (9, 10), which are closed in a delayed way after closing the limiting contactor (7), by means of which the direct current supply voltage is applied to a mono-phase rectifier with four diodes (11, 12, 13, 14) for the running duty and two thyristors (15 and 16) anti-parallelly mounted on the diodes, said thyristors being blocked in running duty, the bridge output voltage is applied to a LCR network filter, to the negative polarity of the filter capacitor (18) there being connected to the emitter of an IGBT transistor (20) of a direct current variator, to the collector of the transistor (20) there being connected the anode of a working duty diode (21) having the collector connected to the positive polarity of the capacitor (18), to the collector of the transistor (20) there is serially connected a circuit consisting of a current adjusting inductance (23), the series-type traction motor excitation (Ex), a forward-running contactor (24), connected to the "a" terminal of the rotor of the traction motor (M), to the "b" terminal thereof there being connected another forward-running contactor (25) these contactors being closed upon the forward-running of the trolleybus and upon the backward-running, respectively the forward-running contactors (24 and 25) are open, and the motor is supplied with reversed polarity. Echipamentul cu variator de curent continuu, pentru acţionarea troleibuzelor cu motoare de curent continuu, conform invenţiei, conţine două siguranţe fuzibile ultrarapide, de linie (1 şi 2), câte una pentru fiecare fază, un filtru de paraziţi radio, format din două inductanţe (3 şi 4), câte una pentru fiecare fază, un condensator (5) montat în paralel, cu un element de protecţie la supratensiune (6), un contactor de limitare (7), înseriat cu un rezistor de limitare (8) şi două contactoare principale (9 şi 10), care se închid temporizat, după închiderea contactorului de limitare (7), prin care tensiunea continuă de alimentare este aplicată unui redresor monofazat, cu patru diode (11, 12, 13 şi 14) pentru regimul de