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Since the Vreman subgrid-scale model was proposed, different types of flow fields have been used to research the applicability of this model. However, the applicability of the model to a flashover heat flow field simulation and the optimal model coefficient for room fires have not been reported. In this paper, the flashover room fire experiments of different opening sizes (ventilation factor) are...
Thanks to its large carrying capacity, excellent insulation property and high mechanical strength, PTFE insulated tubular busbar has been used in a broad range of applications in power station that covers the voltage level from 0.4 kV to 220 kV in China. PTFE has been found to be exposed to a great risk of partial discharge (PD) erosion which is generated due to the presence of defect within the insulation...
Temperature has a direct effect on the operation of electrical devices. To meet the demands of the smart grid, which needs to apply the control, sensing and communication technology into the power system [1], it is indispensable to design the on-line monitoring system for temperature measurement. In this system, digital temperature sensors are employed to obtain the temperature value of the under-test...
XLPE films were employed as test samples to investigate the effect of cross-linking temperature on space charge decay behavior. The samples were cross-linked with temperature ranged from 150°C to 180°C in thickness of 200 μm. Corona charging method was employed to introduce charges on sample surface, after which open-circuit decay test was carried out at 35°C with relative humidity of ~ 45%. Surface...
In this paper, room temperature vulcanized (RTV) silicone rubber (SiR) was employed as test sample to investigate the relationship between electrical tree propagation characteristics and the experiment temperature. Both the structures and growth characteristics of electrical tree in SiR were observed by using a digital camera and a microscope system. Obtained results show that electrical tree in RTV...
Numerical simulations of a clean room were conducted by software FDS5.3 using large-eddy simulation (LES). A computational fluid dynamics (CFD) model was first verified by comparing computational results with results of reduced scale clean room fire tests. The temperature near the ceiling round the fire location with three sizes acetone liquid fire were then studied for a typical full-scale clean...
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