DocumentCode :
3013305
Title :
Diagnosis of HVDC insulation systems by use of oil-conductivity measuring methods
Author :
Schober, F. ; Zink, M.H. ; Kuchler, A. ; Liebschner, M. ; Krause, Christoph
Author_Institution :
Univ. of Appl. Sci. FHWS, Schweinfurt, Germany
fYear :
2012
fDate :
23-27 Sept. 2012
Firstpage :
250
Lastpage :
253
Abstract :
HVDC (high voltage direct current) transmission is a very effective way of power transmission. For DC applications the oil conductivity is an important quantity for the design, the diagnosis and the condition assessment of HVDC insulation systems. Insulating oil has a strongly nonlinear conductivity which depends on various parameters (field strength, temperature, water content and ageing) and is time-dependent because of charge carrier drift processes. Special measuring methods are required to provide the information necessary for the condition assessment. In this paper measurements of the relations between initial and steady-state conductivities at different temperatures are presented and the consequences of different conductivity measuring methods for the condition assessment of insulation systems, e.g. in oil-filled converter transformers, are discussed. Moreover, measurements of new and aged oils are compared and taken into account for a diagnosis of oil-filled HVDC insulation systems.
Keywords :
HVDC power convertors; HVDC power transmission; ageing; electrical conductivity; power transformer insulation; transformer oil; HVDC insulation system diagnosis; charge carrier drift process; high voltage direct current transmission; insulating oil; insulation system condition assessment; nonlinear conductivity; oil-conductivity measuring methods; oil-filled HVDC insulation systems; oil-filled converter transformers; power transmission; steady-state conductivity; Conductivity; Conductivity measurement; Current measurement; Dielectric measurements; Insulation; Steady-state; Temperature measurement; HVDC; condition assessment; conductivity; dielectric response; insulation; liquid; oil; time of energization; transformer;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Condition Monitoring and Diagnosis (CMD), 2012 International Conference on
Conference_Location :
Bali
Print_ISBN :
978-1-4673-1019-2
Type :
conf
DOI :
10.1109/CMD.2012.6416422
Filename :
6416422
Link To Document :
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