An inter-turn short circuit (ITSC) in a power transformer winding is a primary cause of transformer failure. Existing methods for ITSC identification have limitations when applied in field conditions. To address this issue, a mobile hardware–software system for identifying electrical equipment parameters (PAK IP-10) has been developed, based on analyzing the decay of a direct current pulse. Verification of the test results for reproducibility, using Cochran’s criterion, demonstrated that the developed PAK IP-10 can be recommended for identifying the presence or absence of inter-turn short circuits in transformer windings.

Keywords: power transformer, inter-turn short circuit, identification, direct current decay test, Cochran’s criterion