Numerical Calculation Model for Obtaining Parameters of Insulation Materials in HVDC-GIL Subjected to Transition Field
In this paper, we compare the differences in the charge accumulation for two different models about conductivity: one in which the conductivity value of the spacer is invariant with time (steady-state conductivity, Model I) and one in which the conductivity value can vary dynamically with time (dyna...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
China electric power research institute
2025-01-01
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| Series: | CSEE Journal of Power and Energy Systems |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/9877997/ |
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| Summary: | In this paper, we compare the differences in the charge accumulation for two different models about conductivity: one in which the conductivity value of the spacer is invariant with time (steady-state conductivity, Model I) and one in which the conductivity value can vary dynamically with time (dynamic conductivity, Model II). The time for the potential distribution to reach a stable state is 8078 s in Model I and 7932 s in Model II. After the charge accumulation reaches saturation, the charges migrate to the middle of the spacer under the applied electric field. Maximum tangential field strength is <tex>${2.56} \times {10}^{6}\ \mathrm{V}/\mathrm{m}$</tex> in Model I and <tex>${2.84} \times {5}\ \mathrm{C}/\mathrm{m}^{3}$</tex>, which is much smaller than the charge density in the spacer. The mechanism underlying the charge accumulation phenomenon is the differences in the conductivity value distribution caused by a time-varying temperature gradient field. This paper can provide a more precise theoretical basis for the selection and modification of HVDC-GIL spacer. |
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| ISSN: | 2096-0042 |