The on-load change-over switch, load stages switch and a method for switching an on-load tap changer

摘要

The on-load change-over switch (5) for a load stages switch (1) for switching over from a connected winding tap (n) to a preselected winding tap (n + 1) of a stepped transformer (9), comprisingat least one resistanceless current path (41, 44, 411, 412, 413, 414, 415),at least one resistor path (42, 43, 421, 422, 423, 424, 425), each with at least one transition resistor (r, r₁, R₂) anda removing current (11) for guiding a load current (i_L), the between the step transformer (9) and the removing current flows (11), wherein a stage voltage (u_St) between the winding taps (n, n + 1) is applied,a voltage (u), which between a preselected winding tap (n + 1) of the step transformer (9) and the removing current (11) is applied,a measuring device (13, 131, 132, 15, 151, 152) andan adjusting device (2),characterized bythe measuring device (13, 131, 132, 15, 151, 152) is - value (φ the_Real) a phase angle (φ) between the load current (i_L) and a voltage (u), which between a preselected winding tap (n + 1) of the step transformer (9) and the removing current (11), and measuresan adjusting device (2), which the temporal order of the wiring of the paths (41, 42, 43, 44, 411, 412, 413, 414, 415, 421, 422, 423, 424, 425) of the on-load change-over switch (5) as a function of the measured is - value (φ_Real) of the phase angle (φ) and a predetermined limit value (φ_Limit) of the phase angle (φ) is variable in such a way that, during a on-load change-over switching the voltage (u), which between a preselected winding tap (n + 1) of the step transformer (9) and the removing current (11) is applied, is always within a voltage range (a) between the connected winding tap (n) and the preselected winding tap (n + 1) is.