LOAD-TRANSFER SWITCH, ON-LOAD TAP CHANGER, AND METHOD OF SWITCHING SAME
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United States of America Patent
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Issued Date -
Jun 25, 2015
app pub date -
Jul 11, 2013
filing date -
Aug 14, 2012
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
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.
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