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.

The invention relates to, among other things, a method for filling and closing containers. At least an upper portion of a container (B) is positioned in a treatment chamber. The container is filled with a carbonated filling material via a filling member up to a gas volume in a head space of the container. The filling member is removed from the container mouth after filling, wherein a pressure in the treatment chamber is greater than a saturation pressure of the carbonated filling material. The pressure in the treatment chamber is reduced below the saturation pressure of the carbonated filling material, thereby causing foaming of the carbonated filling material in the head space of the filled container, which forces the gas volume out of the head space. The container is closed via a closing member.