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Content Provider | IET Digital Library |
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Author | Tschentscher, Malte Graber, David Franck, Christian M. |
Abstract | Humidity has been considered as one of the main influencing factors that determine the conduction processes and electric strength of gas-insulated systems. Whereas in the past, various studies focused on the change in the partial discharge inception voltages, breakdown strength of homogeneous and inhomogeneous field arrangements, and insulator flashover voltage, recent studies have investigated the changes in ion currents measured through different gas gaps. In the framework of this contribution, a highly precise humidity control circuit has been developed to analyse the significance of humidity in the range from −25 to −5°C frost-point, which is fully applicable to operating gas-insulated devices. Using sulphur hexafluoride (SF6) as the insulation gas at 0.45 MPa, Al2O3-filled epoxy resin insulators, and technically rough electrodes, the humidity was found to significantly influence the intensity of microdischarges at interfaces. Charge generation from microdischarges at the interfaces substantially increased with increasing humidity. For an electric field of 5 kV/mm that were applicable to the dimensioning of gas-insulated devices, humidity strongly influences the charge provision from technically rough interfaces and potentially contributes to the surface-charge accumulation at insulator surfaces. On the other hand, for low-field conduction phenomena, no increase in the ion currents from natural ionisation or electrophoretic conduction was observed. For the investigated range of parameters, humidity is expected to be highly relevant for the design of gas-insulated devices. |
Starting Page | 143 |
Ending Page | 150 |
Page Count | 8 |
Volume Number | 5 |
e-ISSN | 23977264 |
Issue Number | Issue 2, Apr (2020) |
Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/hve/5/2 |
Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/hve.2019.0315 |
Journal | High Voltage |
Publisher | The Institution of Engineering and Technology CEPRI |
Publisher Date | 2020-03-04 |
Access Restriction | Open |
Rights License | Creative Commons Attribution -Non Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) |
Subject Keyword | Al2O3 Al2O3-filled Epoxy Resin Insulators Aluminium Compound Breakdown Strength Charge Generation Conduction Process Connector Dielectric Breakdown And Discharges Electric Field Electric Strength Epoxy Insulation Filled Polymers Flashover Frost-point Gas Gaps Gas-insulated Device Gas-insulated System Gaseous Insulation, Breakdown And Discharges Highly Precise Humidity Control Circuit Homogeneous Field Arrangements Inhomogeneous Field Arrangements Inorganic Insulation Insulation Gas Insulator Insulator Flashover Voltage Insulator SurFace Ion Current Low-field Conduction Phenomena Microdischarge Intensity Organic Insulation Partial Discharge Inception Voltage Partial Discharges Power Line Supports Pressure 0.45 MPa SF6 Insulation Sulphur Hexafluoride Surface Charging Surface-charge Accumulation Technically Rough Electrodes Temperature -25.0 DegC to -5.0 DegC |
Content Type | Text |
Resource Type | Article |
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