Abstract The basic theory of streamer and leader discharge in the gas discharge,and the factors affecting long gap discharge,are expounded in this chapter. Additionally,the formation and development process of streamer discharge and thecharacteristics of ...[继续阅读]

    Gas discharge is a general designation of various forms of currents flowing in gas.The pure neutral state gas is non-conductive. The gas will be conductive only whenthe charged particles (such as electrons,ions,etc.) appear. With an electric field,itcan d...[继续阅读]

    6.2.1.1 Breakdown Voltage Under DC VoltageFigure 6.9 represents the breakdown voltages under DC voltages as a function ofgap distances on needle-plate and needle-needle electrodes. In the needle-plate gasgap where electric field distribution is extremely ...[继续阅读]

    Townsend was the first to conduct gas discharge experiments. In a very thickdischarge tube,the gas pressure was fixed at 0.101 MPa and the electric fieldstrength was E=25 kV/cm unchanged. It was found that if there was no ultravioletradiation or electron ...[继续阅读]

    4.1.2.1 Limitation of Townsend Discharge TheoryIn low pressure,Townsend discharge theory can be a good method to describe gasbreakdown and to illustrate Paschen’s law. But when near atmospheric pressure(Pd>70Pa·m),the theoretical discharge time-lag and...[继续阅读]

    With the continuous growth of the electric power demand and more attention attractedby environmental protection,high voltage electrical equipment with a large capacityand compact structure urgently needs to be developed; therefore researchers areseeking n...[继续阅读]

    6.1.3.1 Formation of the Operating Impulse VoltageIn electrical power system,transmission lines and electrical equipment all haveinductance and capacitance with them,due to a sudden change (either a normaloperation or a fault operation) of the system oper...[继续阅读]

    The magnitude of flashover voltage along the surface of the insulator in SF6 iscertainly related to flashover distance. But when under the same SF6 gas pressure,itis more subjected to the uniform degree of the electric field distribution of theinsulator. ...[继续阅读]

    Trifluoromethane is known as chloroform,a liquefied gas under atmosphericpressure,which is colorless,odorless,non-flammable,slightly soluble in water,and soluble in most organic solvents. As seen from Table 9.1,the GWP of CHF3 is11,700,half that of SF6. I...[继续阅读]

    [1] Zhang Yan,Deheng Zhu (1992) High voltage insulation. Tsinghua University Press,Beijing[2] Yuchang Qiu (1994) GIS and its insulation technology. Hydraulic and Electric Power Press,Beijing...[继续阅读]