TAP CHANGER FOR A TRANSFORMER

摘要

The invention relates to a tap changer for a power transformer comprising at least one main and one regulating winding, with a preselector (20) and a fine selector (18), which comprises at least one fine selector contact (29, 30). Besides the fine selector contact (29, 30), the fine selector (18) has at least one auxiliary switch (24), which is actuable independently of the fine selector contact (29, 30) and has at least one auxiliary switching component (26, 28), which contacts taps of the regulating winding in an at least largely arc-free manner. This makes it possible to perform switchover processes of the tap changer in a largely gas-free manner.