Izvorni znanstveni članak
SFRA ratio test on transformers
; Doble Engineering Company
APA 6th Edition
Pong, L. (2021). SFRA ratio test on transformers. Transformers Magazine, 8 (1), 114-120. Preuzeto s https://hrcak.srce.hr/index.php/249904
MLA 8th Edition
Pong, Long. "SFRA ratio test on transformers." Transformers Magazine, vol. 8, br. 1, 2021, str. 114-120. https://hrcak.srce.hr/index.php/249904. Citirano 07.10.2022.
Chicago 17th Edition
Pong, Long. "SFRA ratio test on transformers." Transformers Magazine 8, br. 1 (2021): 114-120. https://hrcak.srce.hr/index.php/249904
Pong, L. (2021). 'SFRA ratio test on transformers', Transformers Magazine, 8(1), str. 114-120. Preuzeto s: https://hrcak.srce.hr/index.php/249904 (Datum pristupa: 07.10.2022.)
Pong L. SFRA ratio test on transformers. Transformers Magazine [Internet]. 2021 [pristupljeno 07.10.2022.];8(1):114-120. Dostupno na: https://hrcak.srce.hr/index.php/249904
L. Pong, "SFRA ratio test on transformers", Transformers Magazine, vol.8, br. 1, str. 114-120, 2021. [Online]. Dostupno na: https://hrcak.srce.hr/index.php/249904. [Citirano: 07.10.2022.]
SFRA test is a powerful and sensitive method for assessing the mechanical and electrical integrity of the transformer core/coil assembly. The two most commonly used tests are open- and
short-circuit tests. Both are used for testing the complex network of inductances, capacitances and electrical resistances and, frequently, have no difficulties in detecting the presence of an electrical fault with the shorted turn(s).
Since windings are electromagnetically coupled, the SFRA trace obtained from one of the windings may be affected by the electrical fault on a different winding. Identifying which winding has the problem is a challenging task. This paper describes the experience with six units, where the faulty winding (if any) was identified by employing an inductive inter-winding SFRA setup. We elected to refer to this test as “SFRA ratio” test.
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