Application Of Alternative Gases In Retro-Filling SF6 Insulated High Voltage Equipment

替代气体在SF6绝缘高压设备加注中的应用

• 批准号: 1833101
• 金额: --
• 依托单位: University of Manchester
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2016
• 资助国家: 英国
• 起止时间: 2016 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-1833101
• 关键词: Application; Alternative; Gases; Retro; Filling

Sulphur hexafluoride (SF6) gas has been widely used in high voltage equipment e.g. Gas Insulated Switchgear (GIS) due to its excellent dielectric strength and arc quenching property. However it is one of the six gases included in the Kyoto Protocol, with a high global warming potential. Although SF6 is sealed in the high voltage equipment, utilities including National Grid are often penalised due to its leakage. Environmentally friendly alternative gases to replace SF6 in high voltage equipment have been proposed in recent years. Most of current research focuses on developing new high voltage equipment filled with those alternative gases. The aim of this research project is, however, to investigate the feasibility of retro-filling the existing SF6 equipment owned by National Grid with alternative gases. One of the promising candidates chosen for the project is Fluoronitrile based NOVEC gas. A test system which can replicate typical fields found in 400 kV SF6 filled equipment will be established. The dielectric strength of the alternative gas or gas mixture with SF6 under AC, lightning impulse (LI) and switching impulse (SI) voltages will be characterised, whereas SF6 only will be tested as benchmark. Both conductor to wall bulk gas insulation and spacer surface insulation will be considered. Different percentages of gas mixture under a range of pressures will be studied. Effect of particle contamination and moisture ingression on the performance of the alternative gas/gas mixture will also be studied. Partial discharge measurement and spectrum analysis of gas components after discharge or breakdown will be carried out. A long term withstand test will finally be deployed to verify the long-term performance of the proposed solution.

六氟化硫（SF6）气体具有优良的绝缘强度和灭弧性能，在气体绝缘组合电器（GIS）等高压设备中得到了广泛的应用。然而，它是京都议定书中包括的六种气体之一，具有很高的全球变暖潜力。虽然SF6被密封在高压设备中，但包括国家电网在内的公用事业公司经常因其泄漏而受到惩罚。近年来，已经提出了在高压设备中替代SF6的环境友好的替代气体。目前的研究主要集中在开发新的高压设备填充这些替代气体。然而，本研究项目的目的是调查用替代气体对国家电网拥有的现有SF6设备进行补充的可行性。该项目选择的有希望的候选产品之一是基于氟腈的NOVEC气体。将建立一个能够复制400 kV SF6填充设备中发现的典型场的测试系统。在交流、雷电冲击（LI）和操作冲击（SI）电压下，将对替代气体或含有SF6的气体混合物的介电强度进行表征，而仅将SF6作为基准进行测试。导体对壁体气体绝缘和间隔物表面绝缘都将被考虑。将研究在一定压力范围内不同百分比的气体混合物。还将研究颗粒污染和水分侵入对替代气体/气体混合物的性能的影响。对放电或击穿后的气体成分进行局部放电测量和光谱分析。最终将部署长期耐受性测试，以验证建议解决方案的长期性能。

项目成果

Breakdown Characteristics of C3F7CN/CO2 Gas Mixtures in Rod-Plane Gaps

C3F7CN/CO2 气体混合物在杆面间隙中的击穿特性

• DOI: 10.1109/ichve.2018.8641943
• 发表时间: 2018
• 作者: Loizou L

A Comparative Study on the Breakdown Characteristics of SF 6 and 20% C 3 F 7 CN / 80% CO 2 Gas Mixture in a Coaxial Configuration

A%20Comparative%20Study%20on%20the%20Breakdown%20Characteristics%20of%20SF%206%20and%2020%%20C%203%20F%207%20CN%20/%2080%%20CO%202%20Gas%20Mixture%20in

• DOI: 10.1109/ceidp47102.2019.9009877
• 发表时间: 2019
• 作者: Loizou L

Partial Discharge Characteristics of C3F7CN Gas Mixture Using the UHF Method

使用 UHF 方法研究 C3F7CN 气体混合物的局部放电特性

• DOI: 10.3390/en15207731
• 发表时间: 2022
• 期刊: Energies
• 影响因子: 3.2
• 作者: Loizou L

Evaluation of UHF Partial Discharge Measurements for SF6 and 20% C3F7CN/80% CO2 Gas Mixture

评估%20of%20UHF%20部分%20放电%20测量%20for%20SF6%20和%2020%%20C3F7CN/80%%20CO2%20气体%20混合物

• DOI: 10.1109/icd46958.2020.9341945
• 发表时间: 2020
• 作者: Loizou L