Modeling, Analysis and Detection of Internal Winding Faults in Power Transformers

چکیده مقاله

Abstract— Winding inter-turn fault is critical in power transformers since its effect is not easily comprehensible at lower magnitude in the signatures of terminal voltages and currents. This paper presents a new and efficient approach for diagnosing the occurrence of incipient turn to turn short-circuits in the windings of power transformers. The transformer is modeled in steady state and no-load operation. Analysis shows that the phase difference between the input voltage and input current in faulty primary winding is changed in a manner that makes it a good measure to find the fault. A set of laboratory experiments on a custom-built transformer under various levels of faults confirms our theoretical analysis and results.