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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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

Received: 07 May 2019

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TM835

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	Liu Ming
	Zou Jianming
	Qiu Rui
	Li Zhenzhu
	Zhou Wenjun

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Liu Ming,Zou Jianming,Qiu Rui等. The Computation of Diffusion Characteristics of Decomposition Gases in SF₆ and SF₆/N₂ within Gas Insulated Transmission Lines[J]. Transactions of China Electrotechnical Society, 2020, 35(11): 2478-2490.

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

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