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Algae contamination was widely observed on the surface of RTV (Room Temperature Vulcanized Silicone Rubber) surface, which was a threat to the external insulation performance of composite insulating materials. Algae growth on RTV coating was simulated under artificial laboratory conditions in this paper. The electrical performance of algae coated RTV materials was measured by flashover tests and leakage...
The converter valve is the core equipment in the HVDC transmission power system and the thyristor level is the basic unit of HVDC converter valve, its performance has a direct effect on the reliability, stability and efficiency of the whole power system. Thus, each thyristor level in the converter valve needs to be test routinely during the maintenance period of the electric equipment in order to...
Market demands on the product performance and additional service of oil-immersed distribution transformer have become increasingly diversified. Single form of oil-immersed distribution transformer product and pure business relationship cannot adapt to current needs. Product service system innovation design can change single product form to the combination of product and service, it has the significance...
Room temperature vulcanized silicone rubber (RTV) coatings have been widely used in the world to prevent the pollution flashover in transmission lines. Thickness of the RTV coatings which was hard to measure with regular methods, was one of the most important properties and required by State Grid Company. As a fast and online analysis method, laser-induced breakdown spectroscopy (LIBS) has been applied...
Artificially triggering lightning on distributed base station (DBS) tower was realized by taking a series of measures including mounting the rocket launchers separately from the tower, connecting nylon line as a buffer, adding PVC pipes to the tower platform railing and making the lightning current measuring chamber insulated from the iron tower. Five lightning discharges were triggered on DBS tower...
This paper presents a statistical analysis of the characteristics of surge currents measured in a number of cables in a Distribution Base Station (DBS) system when being struck by rocket-triggered lightning. The measurements were conducted in the period from 2011 to 2013 at Guangdong, China. Lightning strikes were triggered through a 6.1m lightning rod at the top of a 15.2 m experimental metallic...
Partial discharge (PD) is usually happened caused by flaw and deterioration of transformer insulation. It is the main reason of the accident of transformer and power system. Therefore, it's necessary and important to detect the partial discharge of transformer while operating and manufacturing. When PD of transformer internal insulation occurs, electromagnetic waves, sound waves and other signals...
This experiment investigates on the possibility of inducting energy directly from transmission line for inspection robot on high-voltage transmission line. In this experiment, the first aspect analyzed was the influence of amount of current flowing through high-voltage line on the energy induced. The second aspect analyzed in the experiment was the influence of resistance in the secondary side on...
This paper introduces an efficient method to predict the conducted EMI of switched mode power supply (SMPS) through time domain SPICE simulation, which can be used to design or optimize the filter circuit and quantify the suppression degree of the filter. The SMPS modelling method permits modelling of the SMPS as a noise signal source even when its internal structure is unknown. The method is verified...
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