SF6及SF6/N2中分解气体在气体绝缘传输管道内的扩散特性计算

doi:10.19595/j.cnki.1000-6753.tces.190544

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摘要为明确气体绝缘传输线或称气体绝缘输电管道（GIL）内分解气体的扩散过程及其对化学检测法的影响,基于Fick定律和Fuller-Schettler-Giddings（FSG）方程建立GIL内分解气体在SF₆及SF₆/N₂中的扩散模型。利用密度泛函理论（DFT）和范德华表面分析,得到了分子扩散体积V_d的预测方法。通过有限元法（FEM）对不同温度T、压力p及SF₆混合比${{\varphi }_{\text{S}{{\text{F}}_{\text{6}}}}}$下的扩散过程进行计算,并结合理论分析及多元非线性拟合,得到八种主要特征分解气体浓度的时域和空间预测模型。结果表明,分解气体的扩散主要与扩散系数D_G有关,T、p以及${{\varphi }_{\text{S}{{\text{F}}_{\text{6}}}}}$对于扩散过程的影响也主要体现在扩散系数上,且温度对扩散系数的影响要小于压力p和SF₆混合比${{\varphi }_{\text{S}{{\text{F}}_{\text{6}}}}}$。各分解气体浓度c_G随距离的增加呈指数衰减,随时间的增加呈指数增长。扩散过程会使检测处和缺陷源头处间的c_G产生差异,从而影响化学检测法的准确性。此外,在扩散作用下,各类特征气体在绝缘诊断中的权重也会发生改变。

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关键词 ：化学检测法, 气体绝缘传输线, 分解气体扩散, 扩散系数, 分子扩散体积, 传质模型

Abstract：In order to obtain the impact of diffusion process on chemical detections for gas insulated transmission lines (GIL), the diffusion model of decomposition gases in SF₆ and SF₆/N₂ was done based on Fick's law and Fuller-Schettler-Giddings (FSG) equation. The prediction method of molecular diffusion volume V_d was built by density functional theory (DFT) and van der Waals surface analysis. The diffusion processes under different temperature T, pressure p and mixed ratio of SF₆ ${{\varphi }_{\text{S}{{\text{F}}_{\text{6}}}}}$ were calculated by finite element method (FEM). The prediction models for concentrations c_G of 8 main decomposition gases at different time and position were built by multivariate nonlinear regressions. The results shew that the diffusion of decomposition gases were mainly related to their diffusion coefficient D_G. The influences of T, p and ${{\varphi }_{\text{S}{{\text{F}}_{\text{6}}}}}$ were mainly reflected on D_G. The effect of T was smaller than that of p and ${{\varphi }_{\text{S}{{\text{F}}_{\text{6}}}}}$. The c_G decayed exponentially with distance and increased exponentially with time. Diffusions could cause difference in c_G between sites of detection and defection. That would affect the accuracy of chemical detection methods. In addition, the diffusion may change the weights of decomposition gases in insulation diagnoses.

Key words： Chemical detection method gas insulted transmission lines (GIL) diffusions of decomposition gases diffusion coefficient molecular diffusion volume mass transfer model

收稿日期: 2019-05-07

PACS:

TM835

基金资助:国家电网公司科技项目（SGHZ0000AJJS1800199）和国家重点研发计划（2017YFB0902500）资助

通讯作者: 邱睿男,1992年生,博士研究生,研究方向为SF₆替代技术。E-mail：rui_qiu@whu.edu.cn

作者简介: 刘溟男,1975年生,博士,高级工程师,从事电网安全监督和输变电设备运维检修管理工作。E-mail：lium1212@cc.sgcc.com.cn

引用本文:

刘溟, 邹建明, 邱睿, 李振柱, 周文俊. SF₆及SF₆/N₂中分解气体在气体绝缘传输管道内的扩散特性计算[J]. 电工技术学报, 2020, 35(11): 2478-2490. Liu Ming, Zou Jianming, Qiu Rui, Li Zhenzhu, Zhou Wenjun. The Computation of Diffusion Characteristics of Decomposition Gases in SF₆ and SF₆/N₂ within Gas Insulated Transmission Lines. Transactions of China Electrotechnical Society, 2020, 35(11): 2478-2490.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.190544 https://dgjsxb.ces-transaction.com/CN/Y2020/V35/I11/2478

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