MY147278A - Transforming apparatus for automatically adjusting three-phase power supply voltage - Google Patents

Abstract

A TRANSFORMING APPARATUS AUTOMATICALLY ADJUSTING THE VOLTAGE OF THREE-PHASE POWER SUPPLY COMPRISING THREE INPUT TERMINALS,THREE OUTPUT TERMINALS,A Y-CONNECTION THREE-PHASE TRANSFORMER,A SWITCH GROUP,AND A SWITCH SWITCHING CICRUIT.THE THREE INPUT TERMINALS ARE RESPECTIVELY CONNECTED TO THREE MAIN LINES OF THE THREE-PHASE POWER SUPPLY,AND THE THREE OUTPUT TERMINALS ARE CONNECTED TO A LOAD INSTALLATION. THE Y-CONNECTION THREE-PHASE TRANSFORMER COMPRISES AN R-PHASE WINDING CIRCUIT, AN S-PHASE WINDING CIRCUIT, AND T-PHASE WINDING CIRCUIT. IN THE R-PHASE WINDING CIRCUIT, AN R-PHASE MAIN WINDING, AN R-PHASE FIRST AUXILIARY WINDING, AN R-PHASE FIRST SWITCH, AN R-PHASE SECOND AUXILIARY WINDING, AND AN R-PHASE THIRD AUXILIARY WINDING ARE SERIALLY CONNECTED IN THAT ORDER BETWEEN THE INPUT TERMINAL RIN AND A NEUTRAL POINT 0, THE OUTPUT TERMINAL ROUT BEING CONNECTED TO THE OTHER END OF THE R-PHASE MAIN WINDING. AN R-PHASE SECOND SWITCH CONNECTED IN PARALLEL WITH A SERIES CIRCUIT OF THE R-PHASE FIRST AUXILIARY WINDING AND THE R-PHASE FIRST SWITCH.AN R-PHASE THIRD SWITCH IS CONNECTED IN PARALLEL WITH A SERIES CIRCUIT OF THE R-PHASE AUXILIARY WINDING, THE R-PHASE SWITCH, AND THE R-PHASE SECOND AUXILIARY WINDING.AN R-PHASE FOURTH SWITCH IS CONNECTED IN PARALLEL WITH A SERIES CIRCUIT OF THE R-PHASE SECOND AUXILIARY WINDING AND THE R-PHASE THIRD AUXILIARY WINDING.THE SWITCH SWITCHING CIRCIUT CONTROLS THE SWITCHES BASED ON THE VOLTAGE LEVEL OF THE OUTPUT TERMINALS TO SWITCH BETWEEN FIRST TO FOURTH MODES IN AN ALTERNATIVE MANNER.