Investigation on Mechanical and Magnetic Field Behaviors of GIB Plug-in Connector under Different Contact Conditions

摘要

In order to provide an effective detection method for internal contact fault of gas insulated bus (GIB), mechanical and magnetic field behaviors of GIB plug-in connector under different assembly conditions are analyzed by finite element (FEM) method in this paper. Contact forces on individual contact spots are obtained by mechanical field analysis then simulated by imperfect contact bridge models during electromagnetic field analysis. Magnetic field distributions around GIB plug-in connector under the various contact statuses (conductor insert depth and docking angle) are studied through numerical modeling and field testing. Results show that the mechanical contact parameters (contact forces and radiuses) of individual contact fingers vary from each other under the action of holding spring deformation and conductor gravity, and the surrounding magnetic field has strong relationship with the internal mechanical contact status. The magnetic field strength distributes uniformly around the GIB plug-in connector under well assembly condition. However, the magnetic field distorts since mechanical contact status is changed by the contact degradation or contact failure.