Thermal monitoring of large power transformers

Author

Schafer, M. ; Feser, K.

Author_Institution

Inst. of Energy Transmission & High Voltage Technol., Stuttgart Univ., Germany

fYear

1999

Firstpage

98

Abstract

The ageing of oil immersed cellulose insulation material mainly depends on its thermal load. Up to now cellulose insulation is used in most of the power transformers. In order to give special attention to the thermal behavior of oil immersed power transformers, a monitoring system was developed. The system measures the load, typical temperatures of the transformer and its cooling units, the tap changer position and the state of fans and pumps of all cooling units. In addition the output signal of a gas-in-oil sensor is evaluated. The hardware setup and the thermal monitoring algorithms used in the system are described. In order to determine the winding temperature distribution with improved accuracy a thermal model has been designed and integrated in the monitoring system.

Keywords

ageing; insulation testing; power transformer testing; temperature measurement; transformer oil; ageing; cooling units; fans; gas-in-oil sensor; hardware setup; load measurement; monitoring system; oil immersed cellulose insulation material; output signal; power transformers; pumps; tap changer position; temperature measurement; thermal load; thermal monitoring algorithms; transformer hot spot; winding temperature distribution; Aging; Cooling; Monitoring; Oil insulation; Petroleum; Position measurement; Power transformer insulation; Power transformers; Temperature sensors; Thermal loading;

fLanguage

English

Publisher

ieee

Conference_Titel

Electric Power Engineering, 1999. PowerTech Budapest 99. International Conference on

Conference_Location

Budapest, Hungary

Print_ISBN

0-7803-5836-8

Type

conf

DOI

10.1109/PTC.1999.826529

Filename

826529