Abstract
This study purpose is to grope a foreseeing technique of deterioration an electrical insulation performance in suspension-type insulator with salty icicle to evaluate a discharge path using large-scale electrostatic field simulation based on a hierarchical domain decomposition method (HDDM). The whole model of the insulator with accretion icicle is made reality in a wintry testing room. First, we explain a method of making insulator models as objects in the simulation. Then, we explain a calculation method of the discharge path from the simulation results. Finally, we show a result that is compared the simulation result with a result of simple breakdown testing. The icicle accretion insulator models that are used in this study are made to simulate a really environment when occur a breakdown accident due to deteriorate the electrical insulation performance by the salty icicle on the surface; moreover, the 3D CAD models are made based on an actual measuring. These degrees of reproduction natural environments are very high as compared with an accretion model on an only virtual space. The results prove that the discharge path obtained from the electrostatic field simulation is the result to match on high probability as compared with in really breakdown testing.
