Ahmad Khiar, Mohd Shahril and Md Thayoob, Yasmin Hanum and Yang Ghazali, Young Zaidey and Ab Ghani, Sharin and Sutan Chairul, Imran (2012) DIAGNOSIS OF OLTC USING DGA AND STATIC WINDING RESISTANCE TEST. In: 3rd International Conference on Engineering and ICT (ICEI2012) , 4 – 5 April 2012, Melaka, Malaysia .

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On Load Tap Changer (OLTC) failure occurs is due to the insulation degradation and contacts failure inside it. Other than that, contacts wear influences the OLTC performances. The worn contacts will cause hotspots in the OLTC tank and cause the insulating oil to degrade faster. As a result, this will lead to the damage of complete transformer unit. Thus, the research work that has been carried out applied the Dissolved Gas Analysis (DGA) via latest Duval Triangle method during the diagnosis of OLTC rated at 33/11kV, 30MVA at the first stage to provide early indication of OLTC�s breakdown. The Static Winding Resistance Test is then applied at the second stage to figure out any increase of contact resistances for all phases. In addition, it is expected to have a relationship between both results. The results showed that it was proven that by performing DGA via latest Duval Triangle method, the early indication of OLTC�s breakdown can be obtained. Besides, this paper revealed that the Static Winding Resistance Test was capable to provide any sign of bad contacts in fixed condition as well as looses connections.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Contact resistance, Dissolved Gas Analysis (DGA), Duval Triangle Method, OLTC testing, Static Winding Resistance Test.
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Electrical Engineering > Department of Industrial Power
Depositing User: Sharin Ab Ghani
Date Deposited: 18 Feb 2013 10:23
Last Modified: 28 May 2015 03:44
URI: http://eprints.utem.edu.my/id/eprint/6756
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