Research On High Short-circuit Impedance Transformer Arc Suppression Coil Based Grounding System

In recent years, with the continuous development of distribution networks, the scale of power grid is increasing rapidly.What`s more,with the large use of cable lines, the grounding capacitance current is increasing,thus the grounding faults increasing notably and grounding arc can't be self-extinguished,which makes the situation worse. In order to solve this issue,the compensating method of neutral point grounding through Peterson coil is commonly used in our country.Due to this background,the paper studies the high short-circuit impedance transformer arc suppression coil,whitch has the advantages of adjustable inductance and fast response.Firstly,according to the sructure and working principle of the high short-circuit impedance transformer arc suppression coil,established its mathemati- cal model,derived the basic relatioship between the parametes. Secondly, using Matlab / Simulink simulation software to establish its computer simulation model ,whitch can simulate the electrical characteristics of its operation. And using this software to establish 10kV distribution network simulation model, whitch can simulate Peterson coil compensation for the grounding capacitance current.By doing the simulation , we found that when the adjustment range of the high short-circuit impedance transformer arc suppression coil met the actual requiremen- ts,the problem of harmonic current is serious,whitch is not conductive to extinguish the arc.To solve the problem, designed the Single-phase Active Power Filter for he high short-circuit impedance transformer arc suppression coil.And using Matlab / Simulink simulation software to establish its computer simulation model . The simulation results show that the Single-phase Active Power Filter can effectively suppress the harmonic current of the high short-circuit impedance transformer arc suppression coil to solve the problem.Finally, according to the requirements of resonant grounding system ,designed the control system of the high short-circuit impedance transformer arc suppression coil .And designed in detail the trigger pulse control section,which is based on the PIC microcontroller.