A portable control device designed to control contacts of an electrical switch, and including a main drive shaft, a holding shaft, a motor for driving the main shaft and a microcontroller for controlling the motor. In a first direction of insertion, the main shaft is able to be inserted into a first recess of the switch in order to perform a movement for opening/closing the contacts, the holding shaft then being housed in a first holding orifice. In a second direction of insertion, the main shaft is able to be inserted into a second recess of the switch in order to be able to perform a movement for grounding the contacts, the holding shaft then being housed in a second holding orifice. The control device also includes a detector of the direction of insertion, which detector is linked to the microcontroller.

A drive system drives at least one switch. The drive system includes: a drive shaft, which is configured to connect the drive system to the at least one switch and at least one motor, which is configured to be coupled to the drive shaft; a feedback system which is configured to determine a position of the drive shaft and, based on this position, to generate a feedback signal; and a controller which, based on the feedback signal, selects a stored travel profile from a plurality of travel profiles and controls the motor in accordance with the selected travel profile.

A method for producing a voltage for an electric motor of a drive of an electrical switch includes producing a DC link direct voltage from a supply voltage and producing the motor voltage by pulse-width modulation of the direct voltage. A tolerance range for changing the direct voltage is specified, and an actual value of the direct voltage is continually measured. After first measuring the actual value, it is stored in a voltage variable. After each additional measurement, it is checked whether the deviation of the actual from the stored value lies within the tolerance range. The actual value is stored if the deviation from the stored value lies outside of the tolerance range. After each storage, a duty cycle of the pulse-width modulation dependent on the actual value is calculated, and the pulse-width modulation occurs with the duty cycle. A power converter is also provided.

A switch assembly includes a switch; and a drive system for the switch. The drive system includes: a drive shaft connecting the drive system to the switch; a motor configured to drive the drive shaft; and a feedback system, which is configured to determine at least two values for a position of the drive shaft; and to generate a feedback signal on the basis of the at least two values; and a control device which is configured to influence an operation of the motor depending on the feedback signal.

A switch unit for switching over an onload tap changer. The switch unit has an on-load tap changer with an actuating shaft that actuates a switch; and a drive system with a motor. The drive system is mechanically coupled to and configured to actuate the on-load tap changer. The drive system is configured such that, when the on-load tap changer is actuated, the drive system uses the actuating shaft as a store for kinetic energy in such a way that the actuating shaft is accelerated and the switch is actuated by the kinetic energy from the actuating shaft and additional energy provided by the motor.

The disclosure provides wearable devices, comprising a ring-shaped body, input devices, and output devices, designed for users, including users with one or more disabilities. The disclosure also provides systems for wireless control of receiver devices, comprising wearable devices, removable power storage systems, charging stations, and receiver devices or smart receiver devices. Wearable devices of the present disclosure are configured to be modular and interchangeable, and systems of the present disclosure are extensible to the internet and smart devices without requiring rewiring of preexisting devices. Also provided herein are methods of using such wearable devices, receiver devices, smart receiver devices, and systems.