Research On Transformer Arc Suppression Reactor

In the power system,the increase of distribution network capacity leads to the increase of capacitance current to the ground,and the distribution network mostly uses the neutral point to be grounded by the arc suppression coil,so the demand for the arc suppression coil is getting higher and higher^[1-2].In this paper,a multi-winding transformer type arc-suppression reactor is designed and manufactured in the transient compensation and steady-state compensation of single-phase ground short-circuit fault.This paper mainly studies the design of multi-circle type arc-suppression reactor（structure and control system of adjustable reactor）and the detection of ground capacitance current in distribution network.in this paper,the system of neutral point resonant grounding of distribution network through arc suppression coil is studied.the transient process and steady-state process of single-phase grounding short-circuit fault are analyzed and simulated.the flexible transient grounding mode^[3]is proposed to compensate in transient process.By comparing several kinds of large-capacity arc-suppression reactors,the multi-winding transformer type arc-suppression reactors are analyzed and improved.The main body of the arc suppression reactor is a multi-winding transformer,and the original side winding is a working winding,which is connected in series between the neutral point and the ground.the secondary side multi-winding of the secondary side（this design is 3 winding）is closed in turn with two windings connected with a calculated inductor as the short circuit winding to carry out the"coarse adjustment"of the equivalent impedance.One of the windings is connected with a single-phase full-bridge inverter,which is realized by controlling the output current of the inverter linear regulation of the equivalent reactance of the arc suppression reactor.Based on Matlab/Simulink simulation software,the principle of multi-winding transformer type arc-suppression reactor is verified by simulation analysis.The experimental results show that the output equivalent impedance of multi-winding transformer type arc-suppression reactor is continuously adjustable in a wide range,the response speed is fast,and the performance is safe and reliable.Based on the model of transformer 1:1 of arc-suppression reactor body established by ANSYS software,the air gap and whole structure of core are analyzed.The key to the effective compensation of resonant grounding system is that it can measure the capacitance of power network to the ground quickly and accurately.