DocumentCode :
577274
Title :
Effect of repeated impulses on OIP
Author :
Balaji, S.P. ; Lavanya, L. ; Usa, S.
Author_Institution :
Div. of High Voltage Eng., Anna Univ., Chennai, India
fYear :
2012
fDate :
17-20 Sept. 2012
Firstpage :
558
Lastpage :
561
Abstract :
Oil impregnated cellulose paper (OIP) constitute major insulation of transformer windings. The cellulose insulation determines the lifespan of a transformer. Many of the transformer failures are mainly due to frequent application of over-voltages. It is necessary to analyze the degradation of OIP with respect to time interval between the impulse overvoltages. Cellulose degradation is usually characterized in terms of scission fraction which is given by degree of polymerization (DP). In this paper, an attempt has been made to analyze the degradation of OIP for different impulse voltages and time interval between the successive impulse voltages. Detailed experimental analyses are carried out for impulse overvoltages of 1.2/50μs, 0.4/50μs and 0.064/50μs by maintaining the time interval of 1 second, 3 seconds and 5 seconds between the successive impulses.
Keywords :
machine insulation; overvoltage protection; polymerisation; transformer windings; DP; OIP degradation; cellulose insulation; degree of polymerization; impulse overvoltages; impulse voltages; oil impregnated cellulose paper; repeated impulses; scission fraction; time 1 s; time 3 s; time 5 s; transformer failures; transformer lifespan; transformer windings insulation; Degradation; Educational institutions; Insulation; Lightning; Polymers; Power transformer insulation; Standards; Degradation of OIP; Degree of Polymerization; Repeated Impulses; V-N characteristics;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
High Voltage Engineering and Application (ICHVE), 2012 International Conference on
Conference_Location :
Shanghai
Print_ISBN :
978-1-4673-4747-1
Type :
conf
DOI :
10.1109/ICHVE.2012.6357044
Filename :
6357044
Link To Document :
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