TY - GEN
T1 - Numerical analysis of very fast transient overvoltage in GIS
AU - Zheng, Dianchun
AU - Zhang, Zhonglin
AU - Zhu, Shihua
AU - Zhai, Xiuquan
PY - 2011
Y1 - 2011
N2 - Very fast transient over voltage (VFTO) is a kind of phenomenon which commonly occurs in gas insulated switchgear(GIS), and is also receiving more and more attention since it may endanger GIS internal insulation and secondary equipment. For this reason, combining with the VFTO phenomenon in GIS, this paper completed the numerical simulation calculation of VFTO transient process gone through by gas gap in GIS, established an one-dimensional self-consistent hydrodynamic model of gas discharging, in which the electron and ion continuity equations and the Poisson equation of coupled electric field are contained, furthermore, utilized the improved SG algorithm and finite difference method to get numerical solutions of the above equations. This not only provided a new calculation method for VFTO simulation study, but also the breakdown process of GIS gas gap caused by VFTO can be clearly described by simulation results. At the same time, this paper as well showed the numerical simulation results of breakdown characteristics under different atmosphere pressure and different SF 6/N 2 partial pressure ratio, and obtained VFTO time-frequency relations image and three dimensional graphic of gas-gap electric field distribution which is evolved over time. The results show that the frequency bands that VFTO appears mostly are those between 50MHz to 270MHz; when pressure is increased to 0.4-0.6Mpa, the recovery strength of GIS insulation is greatly improved; without increasing the pressure, most of the insulation strength of SF 6 gas mixture are less than that of pure SF 6.
AB - Very fast transient over voltage (VFTO) is a kind of phenomenon which commonly occurs in gas insulated switchgear(GIS), and is also receiving more and more attention since it may endanger GIS internal insulation and secondary equipment. For this reason, combining with the VFTO phenomenon in GIS, this paper completed the numerical simulation calculation of VFTO transient process gone through by gas gap in GIS, established an one-dimensional self-consistent hydrodynamic model of gas discharging, in which the electron and ion continuity equations and the Poisson equation of coupled electric field are contained, furthermore, utilized the improved SG algorithm and finite difference method to get numerical solutions of the above equations. This not only provided a new calculation method for VFTO simulation study, but also the breakdown process of GIS gas gap caused by VFTO can be clearly described by simulation results. At the same time, this paper as well showed the numerical simulation results of breakdown characteristics under different atmosphere pressure and different SF 6/N 2 partial pressure ratio, and obtained VFTO time-frequency relations image and three dimensional graphic of gas-gap electric field distribution which is evolved over time. The results show that the frequency bands that VFTO appears mostly are those between 50MHz to 270MHz; when pressure is increased to 0.4-0.6Mpa, the recovery strength of GIS insulation is greatly improved; without increasing the pressure, most of the insulation strength of SF 6 gas mixture are less than that of pure SF 6.
UR - https://www.scopus.com/pages/publications/84863063564
U2 - 10.1109/ICEPE-ST.2011.6122929
DO - 10.1109/ICEPE-ST.2011.6122929
M3 - 会议稿件
AN - SCOPUS:84863063564
SN - 9781457712722
T3 - 2011 1st International Conference on Electric Power Equipment - Switching Technology, ICEPE2011 - Proceedings
SP - 35
EP - 38
BT - 2011 1st International Conference on Electric Power Equipment - Switching Technology, ICEPE2011 - Proceedings
T2 - 2011 1st International Conference on Electric Power Equipment - Switching Technology, ICEPE2011
Y2 - 23 October 2011 through 27 October 2011
ER -