Temperature rise characteristics simulation of 40.5kV high current cubicle type Gas Insulated Switchgear

摘要

GIS (Gas Insulated Switchgear) is extensively used in the power grid to switch lines and protect the system. The higher requirements are proposed due to the increasing voltage level when comes to its internal over-heating problems. In this paper, the temperature rise of 40.5kV high voltage switchgear is researched with the help of ANSYS APDL and CFX. Firstly, the electromagnetic loss and generated heat of conducting path are obtained on the base of electromagnetic theory in ANSYS APDL. Then, the temperature field and airflow field are coupled to simulate the real situation of the switchgear operation as far as possible on the CFX module. The effects of contact resistance and eddy current are also considered when calculate the temperature field, and results show that heat generation at some contact points is particularly severe. Affected by temperature rise, the internal gases will form vortex airflow in some way, which in return, could influence its temperature distribution. Therefore, compared with only the cooling coefficient and convective heat transfer coefficient considered, this method is more reasonable. At the end of this paper, some measures are put forward to reduce the temperature rise.