Calculation and simulation analysis of closing surge currents in 35 kV capacitor banks in the Ningxia power grid
As the construction of the new power system advances in the Ningxia power grid,there is an increasing urgency for reactive power compensation due to the characteristics of new energy and new energy loads.The parallel capacitor bank,as the most economical solution for substation reactive power compensation,faces challenges with frequent switching requirements due to high-frequency surge currents affecting vacuum and SF6 circuit breakers,limiting improvements in power supply voltage quality.This paper examines the configuration characteristics of 35 kV capacitor banks in the Ningxia power grid and analyzes the impact of typical substation designs on capacitor closing surge currents.It presents a simplified calculation method and simulation analysis for these surge currents.Case calcula-tions and simulation results show that the deviation between the simplified calculation of peak surge current and simula-tion calculation method is within 10%/20%,providing a basis for selecting capacitor switching devices and assessing equipment health under the influence of surge currents.
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