Apparatus for determining the clock hour figure of the vector group of the electrical transformers

The paper presents an apparatus for determining the clock hour figure of the vector group, designed by the authors and constructed on the principle of DC supply method. In order to reduce the time for determination and increasing the reliability, the apparatus has the pairs of the terminals A-B, B-C, C-A, and a-b of an electrical transformer to be verified while directly connected to a measuring block. The results are modelled in a computation block and viewed using a viewing block that through a light emitting diode will indicate the clock hour figure of the vector group. A fault will be signalled by another diode.