Patent ID: 8531188
Filing Date: 2013-09-10
Classification: G01R

Abstract:
1. An improved detector of transformer interturn short circuit using voltage differential, comprising a single-phase transformer in a single-phase high voltage power supply circuit, the single-phase transformer comprising a high voltage winding and a low voltage winding, a potential transformer being provided on a high voltage side of the single-phase transformer, a high voltage being drawn from a tap of the high voltage winding connected to a first converter and converted to a first voltage by the first converter, a second voltage being drawn from the potential transformer connected to a second converter and converted to a second voltage by the second converter; wherein a first comparison is conducted between the first voltage and the second voltage and a first result is outputted, then a low voltage is drawn from a tap of the low voltage winding connected to a third converter and converted to a third voltage by the third converter, a second comparison is conducted between the third voltage and the fourth voltage converted by the fourth converter from full voltage of the low voltage winding and a second result is outputted; and wherein the first result and the second result are compared with predetermined values to determine whether short circuit occurs.