China
Africa
Explore chapters and articles related to this topic
Lightning Protection
Published in T. A. Short, Electric Power Distribution Handbook, 2018
The lightning activity in an area can be measured. Many areas of the world have lightning detection networks that measure the magnetic and/or electric field generated by a lightning stroke, determine if the stroke is from the cloud to the ground, and triangulate the stroke’s position. Such systems help utilities prepare for storms; information on storm intensity, direction, and location helps determine the number of crews to call up and where to send them. Maps generated from lightning detection networks of GFD (or Ng) are the primary measure of lightning activity. Figure 13.5 shows a 15-year GFD contour map of the United States from the U.S. National Lightning Detection Network (NLDN), which has been operating before 1990.
Characteristics of a multi-stroke “bolt from the blue” lightning-type that caused a fatal disaster
Published in Geomatics, Natural Hazards and Risk, 2019
Xiangpeng Fan, Yijun Zhang, Qiyuan Yin, Yang Zhang, Dong Zheng
GHMLLS is a business monitoring system established by the meteorological departments of Guangdong, Hong Kong, and Macao in 2005. Since September 2012, it has had 17 detection stations. The system applies the direction and time difference integrated positioning method to detect the longitude and latitude, GPS time, lightning current amplitude, and polarity of the CG lightning return stroke in real time. A comparison of the results for lightning observation tests showed obvious improvements in the detection efficiency and positioning accuracy of GHMLLS after the number of detection stations was increased in 2012. The system has a lightning detection efficiency of 97%, ground flash return stroke detection efficiency of 91%, and average positioning error of 600 m. The estimated peak current of the return stroke was shown to have a systematic error (Zhang et al. 2016).