Secondary arc characteristics and single-phase autoreclosure scheme of UHV transmission line with hybrid reactive compensation

In order to study the secondary arc characteristics of single-phase transient fault in UHV transmission lines with hybrid reactive compensation, a transmission line electromagnetic coupling model is presented in this paper. Dynamic model of secondary arc was established on the basis of improved Mayer equation. Based on the transient simulation and the method of Laplace transform, the law of secondary arc characteristics in UHV transmission lines with hybrid reactive compensation was obtained. With different compensation degrees of series compensation and controlled shunt reactor, as well as ground fault location, we can find secondary arc current almost increases linearly with the increase of series compensation degree and decreases linearly and then increases with the increase of the controlled shunt reactor compensation degrees. Based on the specific compensation device configuration scheme, a time sequential control strategy between the bypass switch and single-phase autoreclosure were given, which will provide a theoretical guidance for practical application.