Diagnostic techniques used in power transformer turn to turn faults identification based on Sweep Frequency Response Analysis (SFRA)

Sweep Frequency Response Analysis (SFRA) is a technique which is recently used to detect the malfunction operation of electrical power transformers. This paper suggested three diagnostic techniques used to interpret SFRA for power transformer fault turn to turn identification. Namely they are Chinese standard DL-911/2004, Cross-Correlation Coefficient Factor technique (CCF) and R² relative factor technique. The diagnostic techniques are used to identify the transformer turn to turn short circuit faults at high voltage and low voltage sides. The results of diagnostic techniques used in power transformer fault identification; indicate that the used method can accurately identify the transformer faults.