Thermal-Dynamic Stability Analysis for the Enclosed Isolated-Phase Bus Bar Based on the Subsegment Calculation Model

As a part of the power system, the stability of the enclosed isolated-phase bus bar (EIPB) plays an important role in the working safety of the power system. Usually, the dynamic-thermal stability of EIPB is analyzed by the theoretical analysis or the finite-element method (FEM). The dynamic stability can be calculated by 2-D model. For the complex structure and huge size of EIPB, large synchronous generator-side EIPB in power system is rarely analyzed. In this paper, a new co-simulation method of EIPB is studied. The subsegments EIPB model based on FEM is established, and the temperature distribution in joint surfaces is transmitted. The method is applied to a certain type of EIPB in power system. The FEM model is simulated. The temperature distribution of EIPB under certain cooling condition is also calculated. Based on the thermal results, the dynamic stability of EIPB is calculated to analyze the electrodynamic force under short-circuit condition. In addition, the feasibility and the validity of the method are proved by the test EIPB.