时变温差工况下直流GIL/GIS盆式绝缘子动态电场畸变抑制

doi:10.19595/j.cnki.1000-6753.tces.230213

Abstract
Figure/Table
References
Related Citation (15)

Download: PDF (2114 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract In real applications of the DC gas insulated transmission line (GIL) and gas insulated switchgear (GIS), there are large temperature gradients between the HV conductor and the grounding shell of the spacer, which leads to a completely different electric field distribution compared to that at room temperature. The DC electric field distribution is mainly related to the conductivity parameter of the insulating materials. By applying the coating with conductivity gradient, the surface functionally graded material (SFGM) spacer is considered to be an effective way to uniform the electric field distribution in DC-GIL/GIS. Meanwhile, due to the change of power generation and load, the temperature of the HV conductor also fluctuates with time, which brings difficulties to the optimal design of SFGM spacers under complex working conditions. To optimize the surface electric field distribution of the DC-GIL/GIS basin spacer under variable temperature gradient, based on the surface conductivity graded materials (σ-SFGM), the RT-SFGM spacer with the goal of regulating the surface electric field distribution at room temperature (RT) and the GT-SFGM spacer with consideration of different gradients of temperature (GT) are designed in this paper.
Firstly, an electric-heat coupling model of a ±500 kV DC GIL/GIS basin-type spacer is modelled to calculate the electric field distributions under temperature gradients. Considering the gas flow inside the DC-GIL/GIS, the temperature distribution of the spacer is simulated. Experimental results show that the conductivity of the epoxy composites has a strong temperature dependence. As the temperature increases from 30°C to 90°C, the conductivity of the spacer bulk increases by more than 100 times. Compared to the spacer bulk, the conductivity of the coating has a smaller variation with the temperature. Different reference electric fields are selected as optimization goals for the RT-SFGM spacer and the GT-SFGM spacer. Based on the iterative optimization method, the thickness of the RT-SFGM spacer and the GT-SFGM spacer are designed. After iterative optimization, the coating layer thickness of the optimized RT-SFGM spacer decreases from the conductor to the shell, while the coating thickness on the convex surface of the GT-SFGM spacer presents a U-shaped distribution.
Simulation results show that, at room temperature, the electric field at the high-voltage triple junction of the uniform spacer is seriously distorted, and the electric field strength of the RT-SFGM spacer and the GT-SFGM spacer at the same position decreases by 53.3% and 49.5%, respectively. With the increasing temperature of the high voltage conductor, the maximum electric field of the uniform spacer gradually transfers to the grounding shell. Under the temperature gradient of 40℃, the GT-SFGM spacer has a better electric field relaxation effect than the RT-SFGM spacer, and the maximum electric field strength decreases by 59.2%. Under current loading and fluctuation conditions, the electric field distribution of the uniform spacer presents a wide range of fluctuation with the current, and the maximum electric field position transfers between the conductor and the shell. The electric field of the GT-SFGM spacer does not change drastically with the current changing, and the electric field change rate is only 7% and 13.1% under current loading and fluctuation conditions, which achieves the stable control of electric field under the variable temperature gradient condition.

Key words： DC GIL/GIS spacer surface conductivity graded materials (σ-SFGM) variable temperature gradient electric field relaxation

Received: 23 February 2023

PACS:

TM216

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors

Cite this article:

URL:

https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.230213 OR https://dgjsxb.ces-transaction.com/EN/Y2024/V39/I9/2851

[1] 李进, 王泽华, 陈允, 等. 高压气体绝缘输电设备用功能梯度材料研究进展[J]. 高电压技术, 2020, 46(7): 2471-2477.
Li Jin, Wang Zehua, Chen Yun, et al.Research progress on functionally graded materials for high voltage gas insulated transmission apparatus[J]. High Voltage Engineering, 2020, 46(7): 2471-2477.
[2] 李文栋, 王超, 陈泰然, 等. 550kV GIS盆式绝缘子小型化设计(二): 介电分布优化[J]. 电工技术学报, 2022, 37(11): 2743-2752.
Li Wendong, Wang Chao, Chen Tairan, et al.Compact design of 550kV basin-type spacer in gas insulated switchgear (partⅡ)—dielectric distribution optimization[J]. Transactions of China Electrotechnical Society, 2022, 37(11): 2743-2752.
[3] 张博雅, 张贵新. 直流GIL中固-气界面电荷特性研究综述Ⅰ: 测量技术及积聚机理[J]. 电工技术学报, 2018, 33(20): 4649-4662.
Zhang Boya, Zhang Guixin.Review of charge accumulation characteristics at gas-solid interface in DC GIL, part Ⅰ: measurement and mechanisms[J]. Transactions of China Electrotechnical Society, 2018, 33(20): 4649-4662.
[4] Li Chuanyang, Deng Baojia, Zhang Zi, et al.Full life property of surface charge accumulation on HVDC spacers considering transient and steady states[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2019, 26(5): 1686-1692.
[5] Nakane R, Hayakawa N, Okubo H.Time and space transition of DC electric field distribution based on emerging field by accumulated charge in gas-solid composite insulation structure[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2021, 28(2): 440-447.
[6] Liang Hucheng, Du Boxue, Li Jin.Electric field regulation and parameter optimization of surface nonlinear conductivity spacer for 500 kV DC-GIL[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2020, 27(4): 1330-1338.
[7] Kurimoto M, Kato K, Hanai M, et al.Application of functionally graded material for reducing electric field on electrode and spacer interface[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2010, 17(1): 256-263.
[8] 李文栋, 刘哲, 有晓宇, 等. 叠层式介电功能梯度绝缘子的介电常数分布优化[J]. 西安交通大学学报, 2016, 50(10): 19-26.
Li Wendong, Liu Zhe, You Xiaoyu, et al.Permittivity distribution optimization for multi-layer dielectric FGM insulator[J]. Journal of Xi’an Jiaotong University, 2016, 50(10): 19-26.
[9] 梁虎成, 杜伯学, 陈允, 等. 基于迭代算法的功能梯度绝缘子介电常数分布优化[J]. 电工技术学报, 2020, 35(17): 3758-3764.
Liang Hucheng, Du Boxue, Chen Yun, et al.Permittivity distribution optimization of functionally graded insulator based on iterative method[J]. Transactions of China Electrotechnical Society, 2020, 35(17): 3758-3764.
[10] 孙秋芹, 郭晓和, 张永涛, 等. 基于介电功能梯度材料的盆式绝缘子电场分布优化[J]. 湖南大学学报(自然科学版), 2018, 45(8): 99-106.
Sun Qiuqin, Guo Xiaohe, Zhang Yongtao, et al.Optimization of electric field distribution for spacer based on dielectric functionally graded material[J]. Journal of Hunan University (Natural Sciences), 2018, 45(8): 99-106.
[11] 尹昊阳, 李文栋, 王超, 等. 介电功能梯度绝缘子设计中的电场优化方法对比[J]. 高压电器, 2021, 57(4): 105-111, 119.
Yin Haoyang, Li Wendong, Wang Chao, et al.Comparison of electric field optimization method in the design of dielectric functional gradient insulator[J]. High Voltage Apparatus, 2021, 57(4): 105-111, 119.
[12] Winter A, Kindersberger J.Stationary resistive field distribution along epoxy resin insulators in air under DC voltage[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2012, 19(5): 1732-1739.
[13] Du Boxue, Ran Zhaoyu, Li Jin, et al.Novel insulator with interfacial σ-FGM for DC compact gaseous insulated pipeline[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2019, 26(3): 818-825.
[14] Du Boxue, Ran Zhaoyu, Li Jin, et al.Fluorinated epoxy insulator with interfacial conductivity graded material for HVDC gaseous insulated pipeline[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2020, 27(4): 1305-1312.
[15] 何顺, 郑易谷, 林川杰, 等. 温度梯度下电荷行为与直流沿面闪络的关联性[J]. 高电压技术, 2020, 46(10): 3597-3604.
He Shun, Zheng Yigu, Lin Chuanjie, et al.Relation between charge behavior and DC surface flashover under temperature gradient[J]. High Voltage Engineering, 2020, 46(10): 3597-3604.
[16] Hering M, Speck J, Großmann S, et al.Influence of gas temperature on the breakdown voltage in gas-insulated systems[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2017, 24(1): 401-408.
[17] 王增彬, 刘姝嫔, 周宏扬, 等. GIS盆式绝缘子温度多物理场仿真方法[J]. 高电压技术, 2019, 45(12): 3820-3826.
Wang Zengbin, Liu Shupin, Zhou Hongyang, et al.Multiphysics simulation method for GIS epoxy spacer temperature[J]. High Voltage Engineering, 2019, 45(12): 3820-3826.
[18] 张震, 林莘, 余伟成, 等. C₄F₇N/CO₂和C₄F₇N/N₂混合气体热力学物性参数计算[J]. 高电压技术, 2020, 46(1): 250-256.
Zhang Zhen, Lin Xin, Yu Weicheng, et al.Thermodynamic calculation of physical properties of C₄F₇N/CO₂ and C₄F₇N/N₂[J]. High Voltage Engineering, 2020, 46(1): 250-256.
[19] Du Boxue, Yao Hang, Liang Hucheng, et al.Multidimensional functionally graded materials (ε/σ-MFGM) for HVDC GIL/GIS spacers[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2022, 29(5): 1966-1973.
[20] Yao Hang, Du Boxue, Liang Hucheng, et al.Electric field relaxation of HVDC GIL spacer with surface conductivity gradient material (σ-SFGM) using electrospinning technology[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2022, 29(3): 1167-1174.