A method for actuating an on-load tap-changer using a control device, a sensor, and a drive is provided. The control device receives a switching command for actuating the on-load tap-changer. The sensor detects a current profile. The control device determines multiple consecutive times for current zero crossings of the current profile and multiple intervals between the multiple consecutive times of the current zero crossings. The control device derives a characteristic variable from the multiple intervals and compares the characteristic variable with a limit value. The control device terminates or pauses the actuation based on determining that the characteristic variable exceeds the limit value and performs the actuation by controlling the drive based on determining that the characteristic variable satisfies or falls below the limit value.

The present disclosure relates to a driving system for an on-load tap changer, comprising a vacuum interrupter driving mechanism configured to drive a vacuum interrupter of the on-load tap changer, an energy accumulation mechanism mechanically coupled with the vacuum interrupter driving mechanism, and a flywheel mechanism mechanically coupled with the vacuum interrupter driving mechanism. The flywheel mechanism comprises a flywheel. The energy accumulation mechanism is mechanically coupled with a primary driving unit and is configured to accumulate and release energy for combined motion of the vacuum interrupter driving mechanism and the flywheel mechanism. The vacuum interrupter driving mechanism and the flywheel mechanism are arranged along a main driving axis and the flywheel is concentrically arranged around the main driving axis.

The disclosure relates to a method for monitoring a vacuum on-load tap changer including determining a total main vacuum interrupter opening time as a time elapsed between a first point in time and a second point in time, a total resistor vacuum interrupter opening time as a time elapsed between the third point in time and the fourth point in time, a circulating current time as a time elapsed between the second point in time and the third point in time, and/or a switch time as the sum of the total main vacuum interrupter opening time, the total resistor vacuum interrupter opening time and the circulating current time.

An item of electrical equipment comprises at least one tap winding having winding taps and at least one partial winding, and a tap changer for changing a transmission ratio, an impedance or a voltage, used for excitation of the item of electrical equipment. The tap changer comprises a first module for connecting the winding taps of the at least one winding tap to one another and a second module for rapid switching-in, switching-out or bypassing of the at least one partial winding. The second module comprises at least one submodule having semiconductor switching elements, and a bypass switch.