Factors Controlling Surface Flashover in SF6 Gas Insulated Systems
| Autor: | Arahata Yoshikuni, H. Takahashi, Hiroshi Kuwahara, T. Nitta, Y. Fujiwara, Y. Shibuya |
|---|---|
| Rok vydání: | 1978 |
| Předmět: |
Condensed Matter::Quantum Gases
Materials science business.industry General Engineering Electrical engineering Energy Engineering and Power Technology Field strength Insulator (electricity) Sulfur hexafluoride Electric arc chemistry.chemical_compound chemistry Electrode Arc flash Condensed Matter::Strongly Correlated Electrons Electrical and Electronic Engineering Composite material business Sheet resistance Leakage (electronics) |
| Zdroj: | IEEE Transactions on Power Apparatus and Systems. :959-968 |
| ISSN: | 0018-9510 |
| DOI: | 10.1109/tpas.1978.354569 |
| Popis: | Various factors controlling the flashover of solid insulators in pressurized SF6, are reviewed and their influences in gas insulated systems are discussed from a practical point of view. Flashover voltage of clean insulator surface is under the influence of the insulator-metal contact as well as the macroscopic electric field distortion due to the high dielectric permittivity of solid insulator. Conducting particles or even fine metal powder can reduce the flashover voltage. Their effects are strongly dependent on the position they are located, the size of the insulator and gas pressure. Humidity of SF, gas should be strictly governed in SF, gas insulated apparatuses, since the condensation of water can decrease flashover voltage considerably. Decomposition products of SF6 due to the arcing in switchgears are deleterious to epoxy insulators particularly when silica is used as their filler. The decomposition products decrease the leakage resistance on the insulation surface. The field strength near positive electrode is enhanced by the electrolytic effect in the surface conduction layer. In some extreme condition, it initiates tracking on the insulator surface. |
| Databáze: | OpenAIRE |
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