| 摘要 |
POSITIONING CONTROL MEANS FOR MOTOR DRIVEN ROTARY TAP CHANGER A rotary tap changer or switch is rotated by a motor to a plurality of contactor positions by a control system having a cam that rotates to activate limit switches respectively corresponding to contactor positions. The activation of the limit switches causes operation of a relay which,after a selected time delay, operates to discharge a capacitor across the motor to apply dynamic braking and stop the motor. when starting the motor to rotate the tap changer, energization is applied through the limit switches to select rotation in a forward or reverse direction determined with some modification by the shortest distance of rotation to the new selected position. |
