A method to calculate uncertainty due to unavailable data in transformer assessment index
Prasojo R.A.a, Tamma W.R.a, Suwarnoa, Maulidevi N.U.a, Soedjarno B.A.a
a School of Electrical Engineering and Informatics, Institut Teknologi Bandung, Bandung, Indonesia
Abstract
© 2020 Institute of Electrical Engineers of Japan. All rights reserved.Transformer Assessment Index (TAI) is a useful tool to rank the power transformers fleet to underline the critical transformers based on multi-parameters. In many cases, the data available for TAI determination is incomplete. Unavailability of the data is one of the limitations of TAI, which it may disguise a poor condition of a transformer as a result of limited data calculation. This paper proposes the use of parameter prioritization results to calculate Certainty Level (CL) due to data availability of a TAI. The proposed approach has been applied to illustrate CL calculation of five scenarios of power transformer data availability. Further illustration has been done to a 150 kV power transformer with six points of measurement data. By expressing the proposed level of uncertainty in addition to the TAI value, the asset manager can obtain better justification in determining the appropriate action for the power transformer operation and maintenance.
Author keywords
Assessment index,Asset managers,Data availability,Limited data,Measurement data,Multiparameters,Operation and maintenance,Prioritization
Indexed keywords
Analytic Hierarchy Process,Certainty Level,Health Index,Transformer Assessment Index,Weighting Factor