ON-LOAD TAP CHANGER, A METHOD OF OPERATING AN ON-LOAD TAP CHANGER AND ELECTRIC SYSTEM WITH AN ON-LOAD TAP CHANGER

摘要

A load stepping switch (1) for uninterrupted changeover between winding taps (n, n+1) on a control winding (20) comprises —a changeover switch (2) that comprises a first, second and third changeover contact (2.1, 2.2, 2.3) and can adopt a first position, in which the first and third changeover contacts are connected, a second position, in which the second and third changeover contacts are connected, and a bridge position, in which the changeover contacts are connected; —a first fixed contact (4) that can be connected to a first winding tap; —a second fixed contact (5) that can be connected to a second winding tap; —a first moving contact (6) that can optionally make contact with each of the fixed contacts; —a second moving contact (7) that can optionally make contact with each of the fixed contacts; —a main path (8) that connects the first moving contact to the first changeover contact; —an auxiliary path (9) that connects the second moving contact to the second changeover contact via a current-limiting element (10); —a switching element (11) that is connected between the main path and the second changeover contact.