Insulation Coordination Considering the Switching Overvoltage Waveshape-Part I: Methodology

A new insulation coordination procedure for switching overvoltages is presented. Based on the results of experiments, it considers the effect of the waveshape of impulses on the air gap strength, especially the impact of the time to crest and existing bumps above the continuous leader inception leve...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2009-10, Vol.24 (4), p.2434-2440
Main Authors: Nunes, R.R., do Couto Boaventura, W.
Format: Article
Language:English
Subjects:
Air insulation
Applied sciences
Arresters
Electrical engineering. Electrical power engineering
Electrical power engineering
Exact sciences and technology
Flashover
Insulation
insulation coordination
Miscellaneous
Power demand
Power networks and lines
Power system transients
power systems
Power transmission lines
Signal processing
Surges
switching transients
Transmission lines
Voltage control
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Summary:A new insulation coordination procedure for switching overvoltages is presented. Based on the results of experiments, it considers the effect of the waveshape of impulses on the air gap strength, especially the impact of the time to crest and existing bumps above the continuous leader inception level. Signal-processing tools are applied to simulated overvoltage waveforms in order to extract their parameters which influence the insulation strength; the risk of failure of the transmission system is then derived. The procedure contributes to the refinement of insulation coordination studies and transmission-line projects. Application and results are provided in the companion paper.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2009.2028477