VOLTAGE PHASE CONTROL TRANSFORMER

摘要

PURPOSE:To avoid change of the secondary terminal voltage despite the change of a phase by adding two pairs of divided windings to a voltage control transformer and choosing properly the number of turns of the divided tap winding round in another phase. CONSTITUTION:A phase controlling tap winding 12 for phase V is formed by securing connection of the number of turns between a tap winding 5 wound in phase U and a tap winding 6 wound in phase W by an amount equivalent to a single tap so that these windings are put on a circular arc where a vector OV' is defined as the radius and then repeating this combination of windings. As a result, the vector VV' of a voltage control transformer is added to the vector OV of a primary terminal voltage. Thus a vector O' is obtained. The voltage levels of the vector V'm obtained by a tap winding wound in another phase and another vector mv are selected so that a point (v) is put on a circular arc defining the OV' as the radius. Then both vectors V'm and mv are added to the OV' for acquisition of the vector Ov of the secondary terminal voltage. This vector Ov has the same voltage level as the vector Ov' and a phase differ ence alpha from the vector OV.