A5101600451- Lightning and Electromagnetic Phenomena
- Electrical Fault Detection and Protection
- Fire effects on ecosystems
- High voltage insulation and dielectric phenomena
- Thermal Analysis in Power Transmission
- Advanced Optical Sensing Technologies
- Combustion and Detonation Processes
- Ionosphere and magnetosphere dynamics
- High-Voltage Power Transmission Systems
- Advanced Fluorescence Microscopy Techniques
- Plant Surface Properties and Treatments
- Ocular and Laser Science Research
- Metaheuristic Optimization Algorithms Research
- Electrostatic Discharge in Electronics
- Microbial Metabolism and Applications
- Food Quality and Safety Studies
- Optical Systems and Laser Technology
- Power Line Communications and Noise
- Quantum-Dot Cellular Automata
- Microgrid Control and Optimization
- Vacuum and Plasma Arcs
- Power Systems Fault Detection
- Power Systems and Renewable Energy
- Integrated Circuits and Semiconductor Failure Analysis
- Electromagnetic Launch and Propulsion Technology
China Meteorological Administration
2016-2025
Chinese Academy of Meteorological Sciences
2019-2020
Guangdong Province Environmental Monitoring Center
2014-2016
Guangzhou Experimental Station
2016
Harbin Institute of Technology
2014-2015
Identifying the influence of metal wire on interfacial energy transfer characteristics is crucial for accurately assessing lightning stroke damage. This study analyzes impact under context return current. Firstly, a method proposed injected inversion calculation. Secondly, preliminary involving are determined through artificially triggered experiment. Additionally, modified laboratory test experiments platform designed. The results quantitatively compared with and without wire. diameter...
Abstract The paper presents an analysis of the residual voltage characteristics surge protective devices (SPDs) made zinc oxide on low‐voltage overhead distribution lines. study observed 65 natural lightning events and found that geometric mean peak value SPDs' was 767.6 V, with a duration 97.3 μs. current flowing through SPDs had 6.4 A, absorbed average 0.2 J energy. Based distinct processes return stroke superimposed M component, impacting SPD can be categorized into three types. currents...
Abstract This study investigates the initial stage (IS) and return stroke (RS) currents of 50 triggered lightning flashes (TLFs) that were conducted in southern China. The IS negative TLFs has a longer duration larger average current, charge transfer, action integral than those reported elsewhere, with geometric means (GMs) 347.9 ms, 132.5 A, 45.1 C, 10.0 × 10 3 A 2 s, respectively. Two positive containing no RS have much greater currents, transfers, integrals when compared TLFs. peak...
High-speed video images of 24 downward negative lightning flashes terminating on tall structures in Guangzhou are selected to analyse the connecting behaviour and upward leaders during attachment process preceding first return stroke. Three types leader have been observed: Type I, tip (DL) (UCL), which accounts for 42% all events (10/24); II, DL's lateral surface UCL, 50% (12/24); III, combination Types I 8% (2/24). For two cases III behaviour, each case had junction points (one with other...
The characteristics of the residual voltage a surge protective device (SPD) connected to an overhead distribution line due nearby natural cloud-to-ground lightning and rocket-triggered are analyzed in this paper. SPD is found be closely related ground potential rise at grounding terminal SPD. For occurring 1.8 km 10.5 away from SPD, (GPR) too small influence with 40-m distance between channel primarily determined by induced for return stroke large M-components process, whereas GPR becomes...
We present our measured residual voltages and current flow of zinc-oxide surge protective devices (SPDs) connected to an overhead distribution line from a nearby rocket-triggered lightning flash that involved 11 return strokes. The obtained results show that, owing the preceding leaders, voltage during leader-return stroke stage exhibited initially positive impulse, after which, changed polarity due induced coupling power lines by durations SPD caused strokes range 95.2 269.0 μs with mean...
Residual voltage of SPD connecting to overhead line is closely related earth potential rise at the grounding terminal SPD. Characteristics residual caused by natural lightning and artificially triggered were analyzed in this paper, results show that: (1) In case lightning, can be regard as zero, difference between two terminals comes from induced on line. (2) When distance point grid within 30 m, not zero. The mainly for return strokes, but some weak processes. influence should ignored. (3)...
This paper presents experimental results obtained from the Guangdong comprehensive observation experiment on lightning discharge during summer 2014. Residual voltages and current flows in a surge protective device (SPD) connected to an overhead distribution line were observed due nearby M-components of triggered flash. with varying characteristics caused by different are analyzed at two terminals SPD, corresponding formation mechanisms for also discussed. Our show that residual SPD three...
This paper analyzes the potential transferred between two independent grounding grids located 40 m apart, one of which, called active grid, was injected with current rocket-triggered lightning flashes. The potentials in another passive and transient response surge protective device (SPD) grid are evaluated. Observations results benefiting from six nearby triggered flashes, which a total 35 return strokes were involved, show that peak ranges -1.1 to -28.5 kV mean -10.7 kV. These voltages...
Based on the triggered lightning technology, this study carried out observational tests regarding impulses of ground potential rise (GPR) to surge protective devices (SPD), and emphatically analyzed impulse damage effects initial long continuous current processes SPDs. The results showed that after currents were injected into grounding grids, SPDs with rated flow rates easily damaged under joint actions subsequent return strokes. It was observed when energy flowing through had accumulated a...
We have evaluated the vertical electric field Ez on roof of a 100-m tall building considering shielding effect surrounding buildings (the shields) due to nearby lightning return strokes flat ground by using 3-D finite-difference time-domain method. Also, we investigated influences and corresponding enhancement factors following parameters: distance d between strike point point; length l plan area, height h, conductivity σ shields; relative position rd those shields in its vicinity. In...
It has been determined that the discharge of lightning current to ground through grounding grid results in high potential at and other nearby grids, which is very destructive. In present paper, based on artificially triggered technology, characteristics rise (GPR), transient effect active under impulse was analyzed. The resistance found decrease for large input currents. On hand, small currents, it usually increases. addition, transfer passive located 40 m from were shown peak value...
We evaluate lightning electromagnetic fields along an ocean-land mixed propagation path generated by return strokes to wind turbines (WTs) using a three-dimensional finite-difference time domain method. In these simulations, we consider the following three cases: strikes onshore WTs, offshore floating and WTs in presence of horizontally stratified ground. Also, investigate effect on two parameters: distance d between WT observation point, dl coastline point. Generally, are affected...
Artificially triggering lightning on distributed base station (DBS) tower was realized by taking a series of measures including mounting the rocket launchers separately from tower, connecting nylon line as buffer, adding PVC pipes to platform railing and making current measuring chamber insulated iron tower. Five discharges were triggered DBS in 2013, three which with complete information. There totally 18 return strokes (RSs) involved these discharges. The average peak RSs -14.94 kA; 10-90%...
We have developed a whole set of range gated laser imaging system with ~3km maximum acquisition distance, the uses Nd:YAG electro-optical Q-switched 532nm as transmitter, double micro channel plate sensor, all components are controlled by trigger control unit accuracy subnanosecond. A scheme is designed for large building ~500m away, and sequence images obtained in experiment, which basic data 3D reconstruction; to improve resolution, we study temporal distribution intensity received signal,...
We have developed two range gating laser imaging systems, which base on modulated gain method and centroid algorithm respectively. The system based uses a pulse as transmitter CCD with image intensifier, through delaying gated receiver repetitiously to acquire series of 2D time-slicing restore the three-dimensional rang image. mainly adopts same is used intensifier constant over time, can capture different intensity images echo respectively in order conduct experiments tow system, results...