LOAD TRANSFER SWITCH, ON-LOAD TAP CHANGER, AND METHOD FOR SWITCHING AN ON-LOAD TAP CHANGER

摘要

The invention relates to a load transfer switch for an on-load tap changer for switching from a connected winding tap to a preselected winding tap of a tapped transformer. The load transfer switch comprises at least one resistance-free current path and at least one resistive path. A measuring device measures an actual value of a phase angle between a load current and a tapped transformer voltage from the preselected winding tap for discharging a current. The chronological connection sequence of the paths of the load transfer switch can be variably adjusted by an adjusting device dependent on the measured actual value and a specified threshold of the phase angle such that the voltage constantly lies within a voltage range between the connected winding tap and the preselected winding tap during a load switch. The invention also relates to an on-load tap changer with such a load transfer switch and to a method for switching a load transfer switch from a connected winding tap to a preselected winding tap of a tapped transformer.