A.A. Suvorov, V.E. Glazyrin, V.P. Erushin
The article presents the results of in-process testing of transformer differential protection developed in cooperation with EXC (Energy X Components). Rogowski coils, are used as sensors, as they have some advantage as compared to current transformers. Application of such sensors makes the algorithms of the protection operation less sophisticated and enhances its performance in case of internal faults with great direct component, as well as improves the protection sensitivity to winding faults inside a transformer tank. The test results have shown that the protection detects a fault of one wind and identifies the internal fault conditions in at least 50 ms.