Surface Charge Accumulation on Basin-Shape Insulator in Various Eco-Friendly Gases with Metal Particle Under AC Voltage
Surface charge accumulation is considered one of the key factors that lead to unexpected insulator flashover failures in gas-insulated switchgear (GIS). With the existence of metal particles, charge accumulation characteristics on insulator surfaces become intricate in eco-friendly gases under AC vo...
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2025-06-01
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| Series: | Energies |
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| author | Xiaohui Duan Chuanyun Zhu Qifeng Shang Zhen Zhang Kaiyuan Wang Yu Gao |
| author_facet | Xiaohui Duan Chuanyun Zhu Qifeng Shang Zhen Zhang Kaiyuan Wang Yu Gao |
| author_sort | Xiaohui Duan |
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| description | Surface charge accumulation is considered one of the key factors that lead to unexpected insulator flashover failures in gas-insulated switchgear (GIS). With the existence of metal particles, charge accumulation characteristics on insulator surfaces become intricate in eco-friendly gases under AC voltage. In this study, the surface charge behavior on a down-scaled 252 kV AC GIS basin insulator model with a linear metal particle adhered to the HV electrode on the convex surface in compressed air (80%N<sub>2</sub>/20%O<sub>2</sub>) and C<sub>4</sub>F<sub>7</sub>N/CO<sub>2</sub> mixtures was investigated. After applying an AC voltage of 40 kV for 5 min, the charge densities on both surfaces were measured, and the effect of the metal particle and gas parameters was discussed. The results showed that charge spots were induced by metal particles on the insulator surfaces, and the polarities of which varied with the gas atmosphere. A decrease in maximum charge density was detected with an increase in C<sub>4</sub>F<sub>7</sub>N proportion at 0.1 MPa, and soar of which was observed at 0.5 MPa. With an increase in gas pressure, the maximum charge density increased in both atmospheres. The total quantity of charges showed similar behavior to the charge densities. It is indicated that the high electronegativity of C<sub>4</sub>F<sub>7</sub>N molecules presents a competing relationship in charge accumulation as the pressure increases. |
| format | Article |
| id | doaj-art-cc43a9292a2c4f4d98faaa8101c88d05 |
| institution | OA Journals |
| issn | 1996-1073 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | MDPI AG |
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| series | Energies |
| spelling | doaj-art-cc43a9292a2c4f4d98faaa8101c88d052025-08-20T02:23:08ZengMDPI AGEnergies1996-10732025-06-011811293510.3390/en18112935Surface Charge Accumulation on Basin-Shape Insulator in Various Eco-Friendly Gases with Metal Particle Under AC VoltageXiaohui Duan0Chuanyun Zhu1Qifeng Shang2Zhen Zhang3Kaiyuan Wang4Yu Gao5Henan Pinggao Electric Co., Ltd., No. 22, Nanhuan East Road, Pingdingshan 467000, ChinaHenan Pinggao Electric Co., Ltd., No. 22, Nanhuan East Road, Pingdingshan 467000, ChinaSchool of Electrical and Information Engineering, Tianjin University, 92 Weijin Road, Tianjin 300072, ChinaHenan Pinggao Electric Co., Ltd., No. 22, Nanhuan East Road, Pingdingshan 467000, ChinaHenan Pinggao Electric Co., Ltd., No. 22, Nanhuan East Road, Pingdingshan 467000, ChinaSchool of Electrical and Information Engineering, Tianjin University, 92 Weijin Road, Tianjin 300072, ChinaSurface charge accumulation is considered one of the key factors that lead to unexpected insulator flashover failures in gas-insulated switchgear (GIS). With the existence of metal particles, charge accumulation characteristics on insulator surfaces become intricate in eco-friendly gases under AC voltage. In this study, the surface charge behavior on a down-scaled 252 kV AC GIS basin insulator model with a linear metal particle adhered to the HV electrode on the convex surface in compressed air (80%N<sub>2</sub>/20%O<sub>2</sub>) and C<sub>4</sub>F<sub>7</sub>N/CO<sub>2</sub> mixtures was investigated. After applying an AC voltage of 40 kV for 5 min, the charge densities on both surfaces were measured, and the effect of the metal particle and gas parameters was discussed. The results showed that charge spots were induced by metal particles on the insulator surfaces, and the polarities of which varied with the gas atmosphere. A decrease in maximum charge density was detected with an increase in C<sub>4</sub>F<sub>7</sub>N proportion at 0.1 MPa, and soar of which was observed at 0.5 MPa. With an increase in gas pressure, the maximum charge density increased in both atmospheres. The total quantity of charges showed similar behavior to the charge densities. It is indicated that the high electronegativity of C<sub>4</sub>F<sub>7</sub>N molecules presents a competing relationship in charge accumulation as the pressure increases.https://www.mdpi.com/1996-1073/18/11/2935gas-insulated switchgearC<sub>4</sub>F<sub>7</sub>N/CO<sub>2</sub>surface chargemetal particle |
| spellingShingle | Xiaohui Duan Chuanyun Zhu Qifeng Shang Zhen Zhang Kaiyuan Wang Yu Gao Surface Charge Accumulation on Basin-Shape Insulator in Various Eco-Friendly Gases with Metal Particle Under AC Voltage Energies gas-insulated switchgear C<sub>4</sub>F<sub>7</sub>N/CO<sub>2</sub> surface charge metal particle |
| title | Surface Charge Accumulation on Basin-Shape Insulator in Various Eco-Friendly Gases with Metal Particle Under AC Voltage |
| title_full | Surface Charge Accumulation on Basin-Shape Insulator in Various Eco-Friendly Gases with Metal Particle Under AC Voltage |
| title_fullStr | Surface Charge Accumulation on Basin-Shape Insulator in Various Eco-Friendly Gases with Metal Particle Under AC Voltage |
| title_full_unstemmed | Surface Charge Accumulation on Basin-Shape Insulator in Various Eco-Friendly Gases with Metal Particle Under AC Voltage |
| title_short | Surface Charge Accumulation on Basin-Shape Insulator in Various Eco-Friendly Gases with Metal Particle Under AC Voltage |
| title_sort | surface charge accumulation on basin shape insulator in various eco friendly gases with metal particle under ac voltage |
| topic | gas-insulated switchgear C<sub>4</sub>F<sub>7</sub>N/CO<sub>2</sub> surface charge metal particle |
| url | https://www.mdpi.com/1996-1073/18/11/2935 |
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