Automation of the temperature elevation test in transformers with insulating oil.
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.
Vicente
José Manuel Esteves
JM
UNIFEI/ISEE-Federal University of Itajubá, P.O Box: 50, 37500-903 Itajubá, MG, Brazil. manuel@unifei.edu.br <manuel@unifei.edu.br>
Rezek
Angelo José Junqueira
AJ
de Almeida
Antonio Tadeu Lyrio
AT
Guimarães
Carlos Alberto Mohallem
CA
D000465:Algorithms; D004581:Electronics; D008838:Microcomputers; D009821:Oils; D013696:Temperature; D013816:Thermodynamics
D009821:Oils