Open AccessEstimation of the measurement uncertainty in the tests of electric distribution transformers filled with insulating liquid -low and high voltage winding resistance
Author(s) -
Vitor Martins Barbosa,
Regis Pinheiro Landim
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1826/1/012095
Subject(s) - transformer , distribution transformer , metrology , voltage , measurement uncertainty , electromagnetic coil , consistency (knowledge bases) , low voltage , engineering , reliability engineering , electrical engineering , electronic engineering , mathematics , statistics , geometry
Considering the lack of a method for comparison and evaluation of the tests of electric distribution transformers filled with insulating liquid, we propose a mathematical modeling of the measurement uncertainty on the resistance measurements of the low and high voltage windings. The mathematical modeling was developed using as theoretical references the Guide to Expression of Uncertainty of Measurement - ISO GUM, the ABNT NBR 5356:2007 standard and Regulatory Ordinances issued by the National Institute of Metrology, Quality and Technology - Inmetro. The models were applied to the test data of transformers as a way to assess their consistency. The measured uncertainties (k = 2) obtained from the tests for resistance measurement of the low and high voltage windings were, respectively,U(RLV) = 2.4x10 −5 ? and U(RHV) = 0.05 ?.