An operational setting of an on-load tap changer used to switch between various winding taps of a tapped transformer is determined by first placing the on-load tap changer in operation with the tapped transformer and then moving the changer in a first rotational direction through a regulating range of its stationary operational settings on different winding taps of the tapped transformer toward an end abutment of the tapped transformer. The position is registered on reaching the end abutment of the regulating range of the on-load tap changer, and then the movement is reversed to return to the first stationary operational setting that is then configured as a predefined operational setting with the help of the parameterization that is stored in a nonvolatile memory of the control device.

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.

An on-load tap changer for a tapped transformer has a controller configured to actuate the on-load tap changer; and a storage unit. A method of operating the tap changer includes: carrying out a switching operation of the on-load tap changer by the controller; updating at least one data record stored in the storage unit depending on the switching operation carried out; checking on a basis of the updated data record whether a locking condition is met, by the controller; and blocking further switching operations based on determining that the locking condition is met, by the controller.

In a method for cleaning an on-load tap changer (19) in a regulating transformer (20), provision is made for the on-load tap changer (19) to comprise a moving contact (11) and a fixed contact (12); for a cleaning signal to be generated; for the moving contact (11) to be frictionally moved relative to the fixed contact (12) on the basis of the cleaning signal. An on-load tap changer (19) in a regulating transformer (20) comprises: a moving contact (11) and a fixed contact (12); a contact drive (17) which is coupled to the moving contact (11); a control device (18) which is connected to the contact drive (17) and is designed in such a manner that the control device can generate a cleaning signal and can transmit said signal to the contact drive (17); wherein the contact drive (17) is designed in such a manner that the contact drive can frictionally move the moving contact (11) relative to the fixed contact (12) on the basis of the cleaning signal.

A device (1) for monitoring an on-load tap changer (2), comprising: a motor drive (4); a monitoring unit (11); and a sensor (6) for acquiring an acoustic signal; wherein the monitoring unit (11) determines a torque curve in the on-load tap changer (2) on the basis of a torque curve on the motor drive (4) and the acoustic signal of the sensor (6).

An on-load tap changer is provided having a plurality of modules, each of which is operable to change taps in a transformer winding. The tap changer includes a motor connected to rotate at least one shaft. The at least one shaft is connected to the tap change modules and is operable upon rotation to cause the tap change modules to each perform a sequence of operations that effectuate a tap change. A multi-turn absolute encoder is connected to the at least one shaft. A monitoring system is connected to the encoder and is operable to determine from the position of the at least one shaft where the tap change modules are in the sequence of operations.

An on-load tap changer is provided having a plurality of modules, each of which is operable to change taps in a transformer winding. The tap changer includes a motor connected to rotate at least one shaft. The at least one shaft is connected to the tap change modules and is operable upon rotation to cause the tap change modules to each perform a sequence of operations that effectuate a tap change. A multi-turn absolute encoder is connected to the at least one shaft. A monitoring system is connected to the encoder and is operable to determine from the position of the at least one shaft where the tap change modules are in the sequence of operations.

The following steps are performed in order to test a tap changer (20) of a transformer (5; 6) which tap changer is designed to change a transmission ratio of the transformer (5; 6): generating a test signal which is supplied to a winding (1-3; 10) of the transformer (5; 6) and to the tap changer (20).

Repeatedly actuating the tap changer (20) in order to change the transmission ratio with each actuation.

Determining a curve of an electrical measurement variable (I; I.sub.1; I.sub.2) of the transformer (5; 6) over time (t) for each actuation of the tap changer (20) depending on the test signal.

Filtering the curves (41, 42) in order to prevent at least one of the curves (41, 42) from being output.

Outputting the filtered curves (41; 42).

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.

A method analyses a state of an on-load tap-changer. The on-load tap-changer has at least one vacuum interrupter for switching between winding taps of a transformer. The method includes: capturing real-time data with respect to the on-load tap-changer; determining tap-changer-specific parameters; and determining at least one characteristic value for ascertaining a state index of the on-load tap-changer on the basis of the real-time data and the tap-changer-specific parameters. The state index includes a period of time until a due maintenance, a remaining service life, or a remaining number of switching processes of the on-load tap-changer.