Feasibility of C(3)F(7)CN/CO(2) gas mixtures in high-voltage DC GIL: a review on recent advances

High Voltage

Yujing Tong¹  Geng Chen¹  Guoming Ma¹  Cong Wang¹  Youping Tu¹  Yuming Shao¹  Chuanyang Li²  Tohid Shahsavarian² 

[1] North China Electric Power University;University of Connecticut;

关键词: gas insulated transmission lines;    flashover;    gas mixtures;    gaseous insulation;    reviews;    carbon compounds;    thermal stresses;    surface flashover performance;    gas stability;    gas-insulated transmission line;    gas-solid interface;    gas environment;    eco-friendly dc gas insulation equipment;    high-voltage dc gil;    eco-friendly insulating gas;    gas-insulated equipment;    gas gap breakdown;    gas mixtures;    review;    renewable energy resources;    offshore wind power plant;    dc transmission;    insulation properties;    lightning impulse voltage;    decomposition characteristics;    thermal stresses;    electrical stresses;    charge accumulation characteristics;    dc voltage stress;    c(3)f(7)cn-co(2);   

DOI  :  10.1049/hve.2020.0083

来源: DOAJ

【 摘 要 】

With the rise of renewable energy resources, especially offshore wind power plant, the DC transmission concept has attracted more and more attention. The selection of eco-friendly insulating gas, as most critical insulating part of gas-insulated equipment is top priority for developing highly reliable system. Moreover, it is acknowledged that eco-friendly C(3)F(7)CN/CO(2) gas mixtures have become a potential alternative to SF(6) gas due to its excellent performance. This study reviews the basic physical properties of C(3)F(7)CN gas/gas mixtures and insulation properties including the gas gap breakdown and surface flashover performance at DC, as well as lightning impulse voltage. Investigation about the gas stability is presented, including the compatibility of gas with solid materials in gas-insulated transmission line (GIL), and the decomposition characteristics under long-term electrical and thermal stresses. The important progress on the charge accumulation characteristics of gas–solid interface in the novel gas environment under DC voltage stress is analysed. Finally, the key issues that need to be paid attention to and further followed through regarding the application of this novel gas in GIL are summarised and put forward. This study hopefully can provide a complete reference for the development of eco-friendly DC gas insulation equipment with C(3)F(7)CN/CO(2) gas mixtures.

【 授权许可】

Unknown