ON-LOAD TAP CHANGER FOR SWITCHING WITHOUT ANY INTERRUPTION BETWEEN WINDING TAPS OF A TAP-CHANGING TRANSFORMER AND TAP-CHANGING TRANSFORMER

摘要

An on-load tap changer (10) for switching without any interruption between winding taps (N1-N5) of a tap-changing transformer (11) according to the centre tap principle comprising: an on-load tap changer (20) having a main branch (40) and an auxiliary branch (50), a main switch (41) in the main branch (40), an auxiliary switch (51) and a current-limiting element (54) in the auxiliary branch (50), which are connected in series; an assist switch (90) for closing and opening a circuit, wherein the assist switch (90) can be connected into the main branch (40) in parallel with the main switch (41) and into the auxiliary branch (50) in parallel with the auxiliary switch (51).