Based on the data of cloud-to-ground lightning obtained by the lightning detection system in Hongya County during 2011-2015,the parameters of lightning current intensity and steepness in Hongya County were analyzed,an...Based on the data of cloud-to-ground lightning obtained by the lightning detection system in Hongya County during 2011-2015,the parameters of lightning current intensity and steepness in Hongya County were analyzed,and the lightning parameters and the annual average density of lightning stroke to earth were discussed in combination with the Design Code for Protection of Structures against Lightning(GB 50057-2010),so as to provide scientific guidance for lightning disaster prevention in Hongya County.展开更多
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
In order to get the distribution characteristics of lightning transient ground potential of 100 MW wind farm in the Chaoyang Mountain,Jinzhai County,the characteristics of lightning parameters within 5 km of the wind ...In order to get the distribution characteristics of lightning transient ground potential of 100 MW wind farm in the Chaoyang Mountain,Jinzhai County,the characteristics of lightning parameters within 5 km of the wind farm were analyzed based on the lightning monitoring data from 2006 to 2020 provided by Anhui Meteorological Bureau.According to the on-site geological investigation,a double-ring ground network model was established to simulate the three-dimensional transient contact voltage and step voltage distribution of a typical wind fan was obtained through simulation.The results show that the average lightning current amplitude around the wind farm was 44 kA,instead of 10 kA in the current traditional simulation research,which is used as the excitation source for the subsequent simulation of lightning transient ground potential.The peak value of lightning transient contact voltage of the single wind turbine is 2158.35 V,and the peak value of lightning transient step voltage is 441.75 V.The simulation results can provide certain reference for subsequent lightning risk assessment,lightning scheme design and ground grid construction of wind farms.展开更多
This paper briefs a method of measuring lightning radiation field with a fast antenna and narrow bandwidth receivers, the first return stroke parameters and the spectrum distribution from 2 kHz to 20 MHz for both grou...This paper briefs a method of measuring lightning radiation field with a fast antenna and narrow bandwidth receivers, the first return stroke parameters and the spectrum distribution from 2 kHz to 20 MHz for both ground discharges and cloud discharges are calculated. The peak radiation field of first return stroke, normalized to 50 km, is (15.2±8.4)V/m. Below 1 MHz, the total energy radiated by the first return stroke is (0.8±1.6)×10~5J, the peak power is (0.8±1.0)×10~10W, the peak current is(27.8±17.1)kA, and the peak current derivation is (109.3±91.5) kA/μs. The peak spectral amplitudes appear between 4 kHz to 10 kHz for ground discharges and 20 kHz to 80 kHz for cloud discharges. From 10 kHz to 3.0 MHz, the spectral amplitudes of the ground discharges decrease in 1/f, and from 3.0 MHz to 20 MHz, in 1/f^2. Below40 kHz, the ground discharge is the main lightning radiation source; and above 40 kHz, both discharges behave similarly. A few special phenomena were found and explained preliminarily.展开更多
文摘Based on the data of cloud-to-ground lightning obtained by the lightning detection system in Hongya County during 2011-2015,the parameters of lightning current intensity and steepness in Hongya County were analyzed,and the lightning parameters and the annual average density of lightning stroke to earth were discussed in combination with the Design Code for Protection of Structures against Lightning(GB 50057-2010),so as to provide scientific guidance for lightning disaster prevention in Hongya County.
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In order to get the distribution characteristics of lightning transient ground potential of 100 MW wind farm in the Chaoyang Mountain,Jinzhai County,the characteristics of lightning parameters within 5 km of the wind farm were analyzed based on the lightning monitoring data from 2006 to 2020 provided by Anhui Meteorological Bureau.According to the on-site geological investigation,a double-ring ground network model was established to simulate the three-dimensional transient contact voltage and step voltage distribution of a typical wind fan was obtained through simulation.The results show that the average lightning current amplitude around the wind farm was 44 kA,instead of 10 kA in the current traditional simulation research,which is used as the excitation source for the subsequent simulation of lightning transient ground potential.The peak value of lightning transient contact voltage of the single wind turbine is 2158.35 V,and the peak value of lightning transient step voltage is 441.75 V.The simulation results can provide certain reference for subsequent lightning risk assessment,lightning scheme design and ground grid construction of wind farms.
文摘This paper briefs a method of measuring lightning radiation field with a fast antenna and narrow bandwidth receivers, the first return stroke parameters and the spectrum distribution from 2 kHz to 20 MHz for both ground discharges and cloud discharges are calculated. The peak radiation field of first return stroke, normalized to 50 km, is (15.2±8.4)V/m. Below 1 MHz, the total energy radiated by the first return stroke is (0.8±1.6)×10~5J, the peak power is (0.8±1.0)×10~10W, the peak current is(27.8±17.1)kA, and the peak current derivation is (109.3±91.5) kA/μs. The peak spectral amplitudes appear between 4 kHz to 10 kHz for ground discharges and 20 kHz to 80 kHz for cloud discharges. From 10 kHz to 3.0 MHz, the spectral amplitudes of the ground discharges decrease in 1/f, and from 3.0 MHz to 20 MHz, in 1/f^2. Below40 kHz, the ground discharge is the main lightning radiation source; and above 40 kHz, both discharges behave similarly. A few special phenomena were found and explained preliminarily.
