To continuously monitor the soil retreat due to erosion in field,provide valuable information about the erosion processes and overcome the disadvantages of inefficiency,high time-consumption and labor-intensity of exi...To continuously monitor the soil retreat due to erosion in field,provide valuable information about the erosion processes and overcome the disadvantages of inefficiency,high time-consumption and labor-intensity of existing methods,this paper describes a novel capacitance sensor for measuring the soil retreat.A capacitance sensor based probe is proposed,which can measure the depth of the soil around it automatically and the data can be recorded by a data logger.Experimental results in the lab verify its usefulness.展开更多
In recent times, silicone rubber insulating material is used for power transmission line and substation insulation applications. In the present work, tracking and erosion resistance of the micro size filled and nano s...In recent times, silicone rubber insulating material is used for power transmission line and substation insulation applications. In the present work, tracking and erosion resistance of the micro size filled and nano size filled silicone rubber material has been studied under the AC voltage, with ammonium chloride as a contaminant, as per IEC 60587 test procedures. The characteristic changes in the tracking resistance of the micro size and nano size filled specimens are analyzed through leakage current measurement. Comparative Tracking Index （CTI） is also evaluated in order to understand the relative behavior of solid electrical insulating material with regard to their susceptibility to surface tracking. Trend followed by the fundamental, third harmonic and fifth harmonic components of the leakage current during the tracking study are analyzed using moving average current technique. It is observed that the harmonic components of leakage current show good correlation with the tracking and erosion resistance of the material. It is noticed that 5 % wt ofnano size filler gives similar performance to that of 30 % wt of micro size filler in silicone composites.展开更多
基金the National Natural Science Foundation of China (Grant No.60672076)
文摘To continuously monitor the soil retreat due to erosion in field,provide valuable information about the erosion processes and overcome the disadvantages of inefficiency,high time-consumption and labor-intensity of existing methods,this paper describes a novel capacitance sensor for measuring the soil retreat.A capacitance sensor based probe is proposed,which can measure the depth of the soil around it automatically and the data can be recorded by a data logger.Experimental results in the lab verify its usefulness.
文摘In recent times, silicone rubber insulating material is used for power transmission line and substation insulation applications. In the present work, tracking and erosion resistance of the micro size filled and nano size filled silicone rubber material has been studied under the AC voltage, with ammonium chloride as a contaminant, as per IEC 60587 test procedures. The characteristic changes in the tracking resistance of the micro size and nano size filled specimens are analyzed through leakage current measurement. Comparative Tracking Index （CTI） is also evaluated in order to understand the relative behavior of solid electrical insulating material with regard to their susceptibility to surface tracking. Trend followed by the fundamental, third harmonic and fifth harmonic components of the leakage current during the tracking study are analyzed using moving average current technique. It is observed that the harmonic components of leakage current show good correlation with the tracking and erosion resistance of the material. It is noticed that 5 % wt ofnano size filler gives similar performance to that of 30 % wt of micro size filler in silicone composites.
