At present,the Lu an Radio and Television Tower is the tallest building in Anhui Province,and it is easily struck by lightning during the thunderstorm season.In order to clearly understand the lightning environment ar...At present,the Lu an Radio and Television Tower is the tallest building in Anhui Province,and it is easily struck by lightning during the thunderstorm season.In order to clearly understand the lightning environment around the TV tower,based on the lightning positioning monitoring data provided by the Anhui Meteorological Bureau,the distribution characteristics of six lightning parameters within 5 km of the TV tower were studied firstly.Secondly,combined with the field survey data,a soil model was established,and the distribution of ground potential and other related parameters were simulated using CDEGS software,which can provide certain reference for the subsequent lightning protection design and construction.展开更多
To protect humans, devices and maintain high reliability of electrical equipments, efficient earthing system has to be provided for residential and commercial buildings. The use of chemical elements around the electro...To protect humans, devices and maintain high reliability of electrical equipments, efficient earthing system has to be provided for residential and commercial buildings. The use of chemical elements around the electrode of earthing systems reduces the earth resistance which improves the efficiency of these systems. However, the use of these elements can’t achieve very small earth resistance especially in the case of dry clay. In addition, they are expensive and not available all the time. This paper presents a method that treats the soil with adding the Dead Sea water instead of the chemical elements to further reduce the earth resistance and to avoid the expenses of these elements. In our approach, the Dead Sea water is added to a hole around the electrode with a distance not exceeding 10 cm to avoid the corrosion layer on the electrode. Practical measurements are demonstrated to show the efficiency of the proposed approach.展开更多
When the tower overhead is struck by the lightning impulse, the lightning current flows into the earth through the impedance of tower and the grounding resistance, which heightens potential of the tower overhead and p...When the tower overhead is struck by the lightning impulse, the lightning current flows into the earth through the impedance of tower and the grounding resistance, which heightens potential of the tower overhead and possibly induces insulator flashover. Lighting rod arrester is used to shield the tower and provide another routine for lightning current, decreasing the potential of tower overhead. In this paper, the performance of a 500 kV lighting rod arrester is tested used in AC transmission system under the current impulse. Besides, the influence of the lightning rod arrester performance on the top potential of tower is also studied. The results show that, when the rod arrester is connected to the tower, the top potential of tower can be obviously limited under the lightning strike.展开更多
文摘At present,the Lu an Radio and Television Tower is the tallest building in Anhui Province,and it is easily struck by lightning during the thunderstorm season.In order to clearly understand the lightning environment around the TV tower,based on the lightning positioning monitoring data provided by the Anhui Meteorological Bureau,the distribution characteristics of six lightning parameters within 5 km of the TV tower were studied firstly.Secondly,combined with the field survey data,a soil model was established,and the distribution of ground potential and other related parameters were simulated using CDEGS software,which can provide certain reference for the subsequent lightning protection design and construction.
文摘To protect humans, devices and maintain high reliability of electrical equipments, efficient earthing system has to be provided for residential and commercial buildings. The use of chemical elements around the electrode of earthing systems reduces the earth resistance which improves the efficiency of these systems. However, the use of these elements can’t achieve very small earth resistance especially in the case of dry clay. In addition, they are expensive and not available all the time. This paper presents a method that treats the soil with adding the Dead Sea water instead of the chemical elements to further reduce the earth resistance and to avoid the expenses of these elements. In our approach, the Dead Sea water is added to a hole around the electrode with a distance not exceeding 10 cm to avoid the corrosion layer on the electrode. Practical measurements are demonstrated to show the efficiency of the proposed approach.
文摘When the tower overhead is struck by the lightning impulse, the lightning current flows into the earth through the impedance of tower and the grounding resistance, which heightens potential of the tower overhead and possibly induces insulator flashover. Lighting rod arrester is used to shield the tower and provide another routine for lightning current, decreasing the potential of tower overhead. In this paper, the performance of a 500 kV lighting rod arrester is tested used in AC transmission system under the current impulse. Besides, the influence of the lightning rod arrester performance on the top potential of tower is also studied. The results show that, when the rod arrester is connected to the tower, the top potential of tower can be obviously limited under the lightning strike.
