Abstract: An on-load transformer tap changing system, for example for a power transformer, wherein the secondary or primary of a transformer includes at least one first tap and one second tap. A main connection circuit is used for permanent connection of the first tap or the second tap to an output terminal of the secondary or primary of the transformer. Secondary connection circuits are each used to connect a tap temporarily and directly to the output terminal of the secondary or primary of the transformer. Each of the connection circuits includes one or more insulated gate bipolar transistors. The system can be controlled without zero current value transition detection in the secondary winding.

Abstract: The invention relates to an on-load transformer tap changing system wherein the secondary or primary of a transformer comprises at least one first and one second taps (p1, p2). A main connection circuit (tra-I2) is used for the permanent connection of the first tap (p1) or the second tap (p2) to an output terminal (b2) of the secondary or primary of the transformer. Secondary connection circuits (I1, I3) are each used to connect a tap (p1, p2) temporarily and directly to said output terminal (b2) of the secondary or primary of the transformer. Each of said connection circuits (I1, tra-I2, I3) comprises one or more insulated gate bipolar transistors and the system can be controlled without zero current value transition detection in the secondary winding. Application: Power transformers.

Abstract: The invention relates to an acquisition path for acquiring a voltage pulse, and to a system and a method making use of said path, the path comprises:a path input for a pulse signal;a module for determining the polarity and for limiting acquisition of the input signal;a control module for controlling acquisition and for storing the polarized peak value of the input signal;a detect-and-hold module for detecting the polarized peak value of the signal being acquired, and for holding it; andselection means for selecting the rating of the signal being acquired;according to the invention the selection module for selecting the rating of the signal being acquired comprises a plurality of measurement ranges all of which are connected at their upstream ends to the path input, and all of which are connected at their downstream ends to automatic selection means for automatically selecting the optimum measurement range for the signal being acquired.