THREE-PHASE SHUNT REACTOR DEVICE OF VARIABLE CAPACITANCE TYPE

摘要

PURPOSE:To realize a miniaturization of the titled device, by a method wherein three shunt reactors of variable capacitance type are arranged in parallel, each reactor comprising an intermediate core with a gap disposed between a main winding and a secondary winding, and the main windings are connected to three-phase lines respectively. CONSTITUTION:If switches are opened, main flux is generated in distribution in main cores 1A-1C and intermediate cores 6A-6C. In three-phase lines, vector sum of main flux distributed in the main cores 1A-1C and intermediate cores 6A-6C becomes zero. Both ends of the main cores 1A-1C are magnetically connected by a yoke core 10, thereby each main core and intermediate core have partial flux circulating therein so as to constitute prescribed main flux and vector sum of the partial flux becomes zero. If the switches are closed and secondary windings are shortcircuited, flux is produced in intermediate cores. Since the intermediate cores are connected by a yoke core 11, flux in each intermediate core is circulated and vector sum thereof is zero. Irrespective of whether the switches are opened or closed, flux produced in each core is circulated even if the core is not magnetically shortcircuited by a yoke core 8. Since the yoke core 8 needs not be used, the device is produced in light weight.