Automation of the temperature elevation test in transformers with insulating oil
Related Experiment Video
Updated: Jul 12, 2026

Comparative Study of Simulation of Temperature Rise in Ring Main Unit
Published on: July 5, 2024
José Manuel Esteves Vicente1, Angelo José Junqueira Rezek, Antonio Tadeu Lyrio de Almeida
1UNIFEI/ISEE-Federal University of Itajubá, P.O Box: 50, 37500-903 Itajubá, MG, Brazil. manuel@unifei.edu.br <manuel@unifei.edu.br>
Abstract:
The automation of the temperature elevation test is outlined here for both the oil temperature elevation and the determination of the winding temperature elevation. While automating this test it is necessary to use four thermometers, one three-phase wattmeter, a motorized voltage variator and a Kelvin bridge to measure the resistance. All the equipments must communicate with a microcomputer, which will have the test program implemented. The system to be outlined here was initially implemented in the laboratory and, due to the good results achieved, is already in use in some transformer manufacturing plants.
More Related Videos
Related Concept Videos
Transformers in Distribution System
Distribution substation transformers come in various ratings and typically use mineral oil for insulation and cooling. To prevent moisture and air from entering the oil, some transformers use an inert gas like nitrogen to fill the...
Instrument Transformers
Insulation Coordination
Differential Relays
Energy Losses in Transformers
There are four main reasons for energy losses in transformers.
The first cause can be the high resistance of the copper windings...
Transformers
The iron core has a substantial relative permeability. Therefore, the magnetic field lines generated due to the current in one winding are almost entirely confined within the core, such that the same magnetic flux permeates each turn of both...

