SWEEP FREQUENCY RESPONSE ANALYSIS (SFRA) FOR DETECTION OF TRANSFORMER MECHANICAL INTEGRITY

Abstract

Transformer is no nuisance equipment. It is static equipment and it works reliably unless it is abused. Transformers do not develop fault within itself, if maintained periodically as per manufacturer's recommendation. However, the same transformer when subjected to external abnormalities, it can develop fault due to some of the reasons. This paper presents technical details regarding Frequency Response Analysis and the role it plays in transformer test and maintenance. SFRA is an electrical test that provides information relating to transformer mechanical integrity. A new technique for a better and faster sweep frequency response analysis results' interpretation like External Short Circuit which exerts electromagnetic forces on transformer windings. The winding can move laterally and thus it weakens the mechanical structure of transformer. The physical displacement or damages either during earthquake, lightning or other environmental events, In above situation, to diagnose the problem, prevent expensive equipment breakdown and to take control of the equipment, the technique of Sweep Frequency Response Analysis (SFRA) can be employed to detect the faults in Transformer core and Winding movement.