Wei Zhou’s research while affiliated with Shenyang University of Technology and other places

Based on 500kV power transformer, according to the mass-spring system model for the axial vibration of power transformer winding and its nonlinear characteristics, a calculation model is simplified, the modal simulation system of power transformer active part, which composes of core, windings, tensile plates and clamp frames is established, the natural frequencies and vibration modal in different levels of axial pre-compression of transformer active part are calculated, the relations between the changes of axial pre-compression and axial vibration natural frequencies on transformer active part are investigated. Meanwhile, the active part vibration caused by axial short-circuit forces of windings under short-circuit conditions is analyzed.

This paper has analyzed the change of power transformer short-circuit current after reclosing when a permanent faults has occurred on system. The transient process of winding flux and inrush current has been analyzed, and the different of current between initial short-circuit and reclosing can be given. The simulation results of inrush current after reclosing has been given through matlab simulation, it can be as a known condition to calculate winding electromagnetic force, and the winding strength will be checked finally. It has some significance to guide project design.