电器与能效管理技术 ›› 2025, Vol. 0 ›› Issue (1): 50-55.doi: 10.16628/j.cnki.2095-8188.2025.01.009

• 仿真技术 • 上一篇    下一篇

SF6/N2混合气体隔离开关的小电流开断特性仿真研究

李欣1, 陈沛龙1, 朱石剑1, 欧阳泽宇1, 钟尧1, 王邸博2   

  1. 1.贵州电网有限责任公司 电力科学研究院, 贵州 贵阳 550002
    2.南方电网科学研究院有限责任公司, 广东 广州 510000
  • 收稿日期:2024-10-23 出版日期:2025-01-30 发布日期:2025-03-17
  • 作者简介:李 欣(1992—),男,工程师,主要从事高压开关设备技术研究。|陈沛龙(1985—),男,高级工程师,主要从事高压电气设备调试与开关设备技术研究。|朱石剑(1993—),男,工程师,主要从事高压开关设备技术研究。
  • 基金资助:
    贵州电网有限责任公司科技计划项目(GZKJXM20252057)

Simulation Study on Low Current Interruption Performance of SF6/N2 Gas Mixture Disconnector

LI Xin1, CHEN Peilong1, ZHU Shijian1, OUYANG Zeyu1, ZHONG Yao1, WANG Dibo2   

  1. 1. Electric Power Research Institute,Guizhou Power Grid Co.,Ltd., Guiyang 550002, China
    2. CSG Electric Power Research Institute Co.,Ltd., Guangzhou 510000, China
  • Received:2024-10-23 Online:2025-01-30 Published:2025-03-17

摘要:

为验证SF6/N2混合气体应用于隔离开关的灭弧可靠性,针对252 kV隔离开关开断母线转移电流过程,建立电弧磁流体动力学(MHD)模型,仿真研究SF6气体和SF6/N2混合气体在不同气体配比、不同开断速度下的燃弧过程。同时建立弧后电击穿评估模型,通过计算电流过零后100 μs内的临界击穿电压,定量研究SF6/N2混合气体的浓度、隔离开关的开断速度对灭弧性能的影响规律。研究结果表明,28%SF6+70%N2混合气体具有较好的燃弧性能与弧后击穿特性,可以实现对SF6气体的替代。开断速度的提升能够进一步提升混合气体恢复强度,但对隔离开关操动机构提出更高要求。

关键词: SF6/N2混合气体, 隔离开关, 磁流体动力学, 灭弧性能, 开断速度

Abstract:

To verify the reliability of SF6/N2 gas mixture applied to the disconnector,in view of the bus-transfer current interruption of 252 kV disconnector,a magneto-hydro-dynamics (MHD) arc model was built to simulate the arc burning process of the SF6 and SF6/N2 mixture under different gas ratios and contact velocities.Meanwhile,a post-arc breakdown evaluation method was proposed by calculating the critical breakdown voltage within 100μs after the current is zero.Then the effect of SF6/N2 gas mixture concentration and breaking speed on the arc extinguishing performance was quantitatively studied.The results show that 28%SF6+70%N2 gas mixture has good arc burning performance and back-arc breakdown characteristics,which can realize the replacement of SF6 gas.The increase of the breaking speed can further improve the recovery strength of the mixed gas,but it puts forward higher requirements for the operating mechanism of the disconnector.

Key words: SF6/N2 gas mixture, disconnector, magneto-hydro-dynamics (MHD), arc extinguishing performance, breaking speed

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