TY - GEN

T1 - Multidimensional Analysis of a Real Transformer Fleet Based on the Evaluation of Oil Properties

AU - Schreiter, Sebastian

AU - Lohmeyer, Holger

AU - Werle, Peter

PY - 2020

Y1 - 2020

N2 - Transformers belong to the most important and most elementary elements in the power system. Because an unplanned outage of a transformer can lead to interrupted power supply or the stop of production, the related costs can be much higher than the costs of the transformer itself. Therefore it is of elementary interest for operators of transformers to know the condition of the transformers, identify risky units and to avoid unplanned outages. Therefore different methods of condition assessment were developed. The most important groups of those methods are electric and dielectric measurements of the transformer and the different analyzing techniques on the insulation liquid (oil tests). The different oil tests can be separated into two main groups of parameters: Firstly the parameters of the standard oil test (SOT). Secondly, failures at the active part can be indicated with the help of the results of the dissolved gas analysis (DGA). In this contribution both groups of parameters - the results of the standard oil test as well as the results of a dissolved gas analysis - were analyzed in a multidimensional investigation to observe if dependencies between both groups of parameters can be found. Therefore it is investigated if typical increased gas contents can be found depending on oil properties or if both groups of parameters can influence each other. These investigations were based on a huge number of oil test results of real transformers of different voltage levels, applications, age, and manufacturers.

AB - Transformers belong to the most important and most elementary elements in the power system. Because an unplanned outage of a transformer can lead to interrupted power supply or the stop of production, the related costs can be much higher than the costs of the transformer itself. Therefore it is of elementary interest for operators of transformers to know the condition of the transformers, identify risky units and to avoid unplanned outages. Therefore different methods of condition assessment were developed. The most important groups of those methods are electric and dielectric measurements of the transformer and the different analyzing techniques on the insulation liquid (oil tests). The different oil tests can be separated into two main groups of parameters: Firstly the parameters of the standard oil test (SOT). Secondly, failures at the active part can be indicated with the help of the results of the dissolved gas analysis (DGA). In this contribution both groups of parameters - the results of the standard oil test as well as the results of a dissolved gas analysis - were analyzed in a multidimensional investigation to observe if dependencies between both groups of parameters can be found. Therefore it is investigated if typical increased gas contents can be found depending on oil properties or if both groups of parameters can influence each other. These investigations were based on a huge number of oil test results of real transformers of different voltage levels, applications, age, and manufacturers.

KW - Dissolved gas analysis oil test

KW - Power transformer

UR - http://www.scopus.com/inward/record.url?scp=85076850908&partnerID=8YFLogxK

U2 - 10.1007/978-3-030-31676-1_66

DO - 10.1007/978-3-030-31676-1_66

M3 - Conference contribution

AN - SCOPUS:85076850908

SN - 9783030316754

T3 - Lecture Notes in Electrical Engineering

SP - 697

EP - 704

BT - Proceedings of the 21st International Symposium on High Voltage Engineering - Volume 1

PB - Springer Nature

CY - Cham

T2 - 21st International Symposium on High Voltage Engineering, ISH 2019

Y2 - 26 August 2019 through 30 August 2019

ER -