Research on on-line winding deformation monitoring of power transformer

The feasibility of estimating winding deformation of power transformer by measuring short circuit reactance is expounded in both theory and practice,and its on line measuring method is proposed.Based on the theoretical research,the on line measuring system of short circuit reactance of transformer is developed.Its operation study on a power transformer in real condition shows that the on line measuring method has better correctness and stability.The change of transformer operating conditions and external factors will not exert an effective influence on reactance measurement and it can be taken as a real time winding deformation indication of power transformer.