DocumentCode :
1820844
Title :
Robust evaluation procedure for lightning impulses
Author :
Hackemack, K. ; Gockenbach, E.
Author_Institution :
Inst. of Electr. Power Syst., Hannover Univ., Germany
Volume :
2
fYear :
2003
fDate :
1-5 June 2003
Firstpage :
518
Abstract :
The existing recommendation for high voltage tests, IEC Publication 60060, is ambiguous in the evaluation of the impulse test voltage, when oscillations or overshoot are superimposed on the peak of the smooth, double exponential waveshape. Particularly impulse tests on transformers may be critical due to the high stress on the insulation during the impulse tests. The contribution describes a proposal for the evaluation with a frequency dependent test voltage factor which is derived from experimental investigations with some basic insulation materials. The test voltage factor method allows robust evaluation procedures which can be used for manual as well as for automatic evaluation. Presenting some examples the contribution shows that the proposed methods are suitable to increase the reproducibility and reliability of lightning impulse tests.
Keywords :
impulse testing; potential transformers; reliability; double exponential waveshape; frequency dependent impulse test voltage factor; high voltage tests; lightning impulse test; reliability; robust evaluation; transformers; Frequency dependence; IEC standards; Impulse testing; Insulation testing; Lightning; Materials testing; Power transformer insulation; Proposals; Robustness; Stress;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Properties and Applications of Dielectric Materials, 2003. Proceedings of the 7th International Conference on
ISSN :
1081-7735
Print_ISBN :
0-7803-7725-7
Type :
conf
DOI :
10.1109/ICPADM.2003.1218467
Filename :
1218467
Link To Document :
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