Abstract
Good electrical contact status is an important guarantee for the stable operation of gas insulated line (GIL). Contact resistance and temperature in contact interface are key parameters which can characterize the contact condition of the current-carrying system in GIL. Generally, the conductor and metal liner cast with insulator are connected by the spring contact. The degradation of contact status can cause severe temperature rise near the insulator, which will reduce the insulation and mechanical properties of insulator and cause discharge accidents. In this paper, firstly, the design and the demand of conductor connecting structure used in 1000kV GIL was introduced. Then, the temperature rise experiment were conducted on 1000kV AC GIL model machine. Finally, the deterioration effect of contact resistance on local overheating was simulated based on the computational fluid dynamics (CFD). According to the thermal analysis and the heat resistance of materials used in GIL, the permissible contact resistance degradation lever was proposed. The results indicated that the temperature near the contact structure is $6^{\mathrm {o}}\text{C}$ higher than that at other locations on the conductor under current load of 6930A. The contact resistance degradation will cause the overheating on the adhered interface between insulator and metal liner and reduced its bond strength. This research can basically provide a reference for 1000kV GIL engineer application and its maintenance.
Published Version
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