宋宇, 林莘, 徐建源, 张佳. 高压断路器中C4F7N/CO2混合气体的开断性能[J]. 高电压技术, 2023, 49(3): 971-981. DOI: 10.13336/j.1003-6520.hve.20221508
引用本文: 宋宇, 林莘, 徐建源, 张佳. 高压断路器中C4F7N/CO2混合气体的开断性能[J]. 高电压技术, 2023, 49(3): 971-981. DOI: 10.13336/j.1003-6520.hve.20221508
SONG Yu, LIN Xin, XU Jianyuan, ZHANG Jia. Interruption Performance of C4F7N/CO2 Gas in High-voltage Circuit Breaker[J]. High Voltage Engineering, 2023, 49(3): 971-981. DOI: 10.13336/j.1003-6520.hve.20221508
Citation: SONG Yu, LIN Xin, XU Jianyuan, ZHANG Jia. Interruption Performance of C4F7N/CO2 Gas in High-voltage Circuit Breaker[J]. High Voltage Engineering, 2023, 49(3): 971-981. DOI: 10.13336/j.1003-6520.hve.20221508

高压断路器中C4F7N/CO2混合气体的开断性能

Interruption Performance of C4F7N/CO2 Gas in High-voltage Circuit Breaker

  • 摘要: C4F7N/CO2混合气体是一种潜在的SF6替代气体,开展其在高压断路器中开断性能的研究,对推动环保输电方式发展、支撑双碳目标实现具有重要的工程意义。基于磁流体动力学(magnetohydrodynamics,MHD)理论,仿真计算了充有0.6 MPa 5% C4F7N/CO2、10% C4F7N/CO2、15% C4F7N/CO2混合气体和纯SF6的40.5 kV断路器20 kA短路电流开断过程,分析C4F7N混合比例对电弧温度特性、灭弧室气压与喷口气流特性的影响规律,并与纯SF6进行比较。研究结果表明:与混合气体相比,SF6气体电弧具有更高的弧芯温度和更小的电弧半径,随着C4F7N比例的增加,混合气体弧芯温度升高、电弧半径减小。断路器短路开断过程中,SF6气体建立起更高的吹弧气压,气吹速度明显高于混合气体,可以形成更好的气吹效果来冷却电弧。最后,基于Mary电弧数学模型计算得到电流零区不同气体的电弧时间常数与电弧功率耗散系数,并以临界恢复电压上升率(rate of rise of TRV,RRRV)定量评判气体开断性能,0.6 MPa的5% C4F7N/CO2、10% C4F7N/CO2、15% C4F7N/CO2混合气体临界RRRV分别为1.54、2.22和2.28 kV/μs,远低于SF6的4.98 kV/μs。

     

    Abstract: The C4F7N/CO2 mixed gas is a potential alternative gas for SF6. It is of great significance to further study its interruption performance in high-voltage circuit breaker for the development of new environmentally friendly power transmission methods and realization of the carbon peaking and carbon neutrality goals. Based on the magnetohydrodynamics theory, the 20 kA short-circuit current interrupting process of 40.5 kV circuit breaker filled with 0.6 MPa 5% C4F7N/CO2, 10% C4F7N/CO2, 15% C4F7N/CO2 and pure SF6 was calculated. The influences of C4F7N content on the arc temperature, arc chamber pressure and nozzle airflow characteristics were analyzed, and compared with pure SF6. The research results show that, compared with mixed gas, SF6 gas arc has higher arc core temperature and smaller arc radius. With the increase of C4F7N content, the mixed gas arc core temperature increases and the arc radius decreases. During the short-circuit interrupting process of the circuit breaker, the SF6 gas establishes a higher gas pressure, and the airflow velocity is significantly higher than that of the mixed gas, which can form a better blowing effect to cool the arc. Finally, the arc time constant and arc power loss coefficient of different gases were calculated based on the Mary arc mathematical model, and the gas interrupting performance was quantitatively evaluated by the rate of rise of TRV (RRRV). The critical RRRV of 5% C4F7N/CO2, 10% C4F7N/CO2 and 15% C4F7N/CO2 at 0.6 MPa are 1.54 kV/μs, 2.22 kV/μs and 2.28 kV/μs, respectively, which are much lower than 4.98 kV/μs of SF6.

     

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