Abstract: A motor drive cabinet in an on-load tap-changer, including an electric motor drive unit and a control unit. The electric motor drive unit includes an electric motor, a gearbox and a position transmitter. The control unit is arranged to control an outgoing axis outgoing from the motor drive cabinet by feeding the electric motor through direct connection to drive the outgoing axis through the gearbox. The position transmitter is arranged to detect movement and position of the outgoing axis and to provide indications thereof to the control unit. The motor drive cabinet is sealed during use with the electric motor drive unit and control unit within the sealing.

Abstract: A control system providing a universal input for receiving a control signal for actuating tap-changing equipment. The system accommodates virtually any signal voltage level commonly used for control of the tap-changing equipment, modifies the received signal to a desired format, and inputs the modified signal to a controller for decoding and actuation of the tap-changing motor. The system is fully electronic, eliminating the use of electromechanical contacts for control of the tap-changer and providing a flexible approach to monitoring and diagnostics even from a location remote from the tap-changing equipment.

Abstract: A control system providing a universal input for receiving a control signal for actuating tap-changing equipment. The system accommodates virtually any signal voltage level commonly used for control of the tap-changing equipment, modifies the received signal to a desired format, and inputs the modified signal to a controller for decoding and actuation of the tap-changing motor. The system is fully electronic, eliminating the use of electromechanical contacts for control of the tap-changer and providing a flexible approach to monitoring and diagnostics even from a location remote from the tap-changing equipment.