Method for measuring the switching time on-load tap changer and circuit for measuring the switching time

摘要

Method for measuring the switching time in the tap changer under load having unselector for preselection unstressed of a previous decision winding (n + 1) and a changing load for real elcambio of making winding (n) to the power winding (n + 1) preselected wherein elcambiador under load has a first contact mechanical switching (MTF) and a second mechanical contact deconmutación (TTF) by means of which it can be connected at the discretion each the two plugs and other winding (n, n + 1) to a load branch (Y) directly through a first branch with a primeracélula vacuum switch (MSV) or through a second branch with a series circuit formed by unasegunda vacuum switching cell (TTV) and a contact resistance (R), characterized in that lugarse first executes a nonvolatile storage of the time sequence specifies the sequence switch deconmutación, ie the switching contacts (MTF; TTF) mechanical opening and cierransucesivamente when a change changer under load and cells vacuum switch (MSV is performed; TTV), that then is made a change changer under load, and that the course of a primeratensión measurement (U_r) applied between the second switching cell vacuum (TTV) and the contact resistance (R) connected in series to it on one side and the load branch (Y) on the other hand is measured during the change bajocarga for further during a second voltage applied measurement (U_R3) measured during cambiobajo load via a measuring resistor (R3) connected in parallel to the second cell deconmutación vacuum (TTV), that subsequently they are detected instants (t1 ... t8) of occurrence of flanks inthe course of the two measurement voltages applied (U_r; U_R3) and finally an assignment detected delos instants (t1 ... t8) is performed with respect or to the specific succession of stored anteriormentede switch the switching sequence, ie the actual values ​​of the instants (t1 ... t8) are compared with theoretical susvalores and detected deviations.