Full-waveform measuring system for lightning current caused by lightning strikes to tall structures

2002 ◽  
Author(s):  
Gao Cheng ◽  
Shi Lihua ◽  
Chen Bin ◽  
Zhang Gongcheng ◽  
Zhou Bihua ◽  
...  
Keyword(s):  
Measuring System ◽  
Lightning Strikes ◽  
Full Waveform ◽  
Lightning Current ◽  
Tall Structures

scholarly journals Characterization of noise in the lightning current derivative signals measured at the CN tower

2021 ◽  
Author(s):  
Petros Liatos
Keyword(s):  
Low Frequency ◽  
Current Data ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Lightning Strikes ◽  
Simultaneous Measurements ◽  
Lightning Current ◽  
Tall Structures ◽  
Current Derivative

Simultaneous measurements of parameters of CN Tower lightning strikes have been performed since 1991. The current derivative signals measured, are corrupted by a 100 kHz oscillating interference. This noise has caused substantial limitations on the usage of the CN Tower lightning current data. As a result, we became motivated to characterize it and search for its source. Furthermore identifying the low-frequency noise is expected to help in its removal and avoid it altogether in future installations. This thesis proves that the low-frequency noise corrupting the lightning current derivative signals is the Loran-C radionavigation signal. This finding is a major contribution not only for the CN Tower lightning project but also for any other research related to measurement of lightning at tall structures. Researchers and experimentalists should be aware of the existence of the Loran-C signal and take the necessary precautions to avoid its interference effect.

scholarly journals Characterization of noise in the lightning current derivative signals measured at the CN tower

2021 ◽  
Author(s):  
Petros Liatos
Keyword(s):  
Low Frequency ◽  
Current Data ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Lightning Strikes ◽  
Simultaneous Measurements ◽  
Lightning Current ◽  
Tall Structures ◽  
Current Derivative

Simultaneous measurements of parameters of CN Tower lightning strikes have been performed since 1991. The current derivative signals measured, are corrupted by a 100 kHz oscillating interference. This noise has caused substantial limitations on the usage of the CN Tower lightning current data. As a result, we became motivated to characterize it and search for its source. Furthermore identifying the low-frequency noise is expected to help in its removal and avoid it altogether in future installations. This thesis proves that the low-frequency noise corrupting the lightning current derivative signals is the Loran-C radionavigation signal. This finding is a major contribution not only for the CN Tower lightning project but also for any other research related to measurement of lightning at tall structures. Researchers and experimentalists should be aware of the existence of the Loran-C signal and take the necessary precautions to avoid its interference effect.

scholarly journals Calculation of lightning surges on the high voltage lines. Case of 220 kV line: Ngo -Brazzaville in Congo

2017 ◽  
Vol 6 (1) ◽  
pp. 13
Author(s):  
Rodolphe Gomba ◽  
Alphonse Omboua
Keyword(s):  
Power Lines ◽  
Protective Equipment ◽  
Worst Case ◽  
Lightning Strikes ◽  
Lightning Current ◽  
Wave Forms ◽  
Lightning Discharges ◽  
Voltage Wave ◽  
High Level ◽  
Insulation Coordination

The importance of line Ngo-Brazzaville (220 kV, 207 km) requires operators to avoid cuts that can increase the risk of instability. We see it is quite rare that a storm that occurs in areas crossed by this line will not cause triggering. Note that due to lightning discharges are the main causes of unscheduled outages of Congo's power lines; we ignore this during the peak values of voltage wave forms that result. In regions with high level keraunic like Congo, reducing insulation failures due to lightning is a concern in the management of overheads lines. This article clarifies the peak values of the voltages that can be achieved on the network in order to build the operators as to the precautions on the insulation coordination of protective equipment related to lightning. For these calculations surge of atmospheric origin (case of lightning), we considered the bi-exponential function and Heidler function for modeling the wave of the lightning current. This methodology led us to specially treat the effects of direct lightning strikes that constitute the worst case because they generate most destructive shock wave that indirect lightning strikes.

The Effect of Lightning Strikes on Bismaleimide Composites by Dynamic Mechanical Analysis

2011 ◽  
Vol 179-180 ◽  
pp. 449-454
Author(s):  
Dong Bing Geng ◽  
Hong Jun Guo ◽  
San Qing Zhang
Keyword(s):  
Glass Transition ◽  
Dynamic Mechanical Analysis ◽  
Mechanical Analysis ◽  
Cross Link ◽  
Lightning Strikes ◽  
Dynamic Mechanical ◽  
Lightning Current ◽  
Link Density ◽  
Cross Link Density ◽  
Composite Samples

In this paper, a new method that has shown significant potential to characterize lightning strikes damage which is couple with dynamic mechanical analysis. The composite samples used in this work are based on carbon fiber/bismaleimide system. The analysis of the dynamic mechanical data demonstrate the glass transition temperature of the composites increased as a function of increasing lightning current , simultaneity with the presence ofpotential damage, whichare result in higher network cross-link density and the incipent degradation of the polymer matrix.

The Study of Inner EM Environment in the Helicopter under the Influence of Lightning Strikes

2014 ◽  
Vol 912-914 ◽  
pp. 860-864
Author(s):  
Yan De Wang ◽  
Cheng Gao ◽  
Fei Guo ◽  
Yan Xin Li
Keyword(s):  
Simulation Analysis ◽  
Current Waveform ◽  
Lightning Strikes ◽  
Lightning Current ◽  
Numeric Simulation ◽  
Environment Characteristic

Numeric simulation of the whole aircraft is conducted in the CST MICROSTRIPES workshop which is based on the theory of TLM. The current waveform is defined according to the standard of SAEARP5412. The EM environment inside the helicopter is analyzed when the lightning strikes on the middle of the helicopter vertically. The lightning current moves along the aircraft to the back, then travels to the middle along the line. Simulation analysis demonstrates that the method can effectively simulate the indirect lightning effect, and shows the EM environment characteristic inside the helicopter.

Currents and radiated electromagnetic fields in lightning strikes to tall structures

2003 ◽  
Vol 12 (4) ◽  
pp. 291-294
Author(s):  
José Luis Bermúdez ◽  
Farhad Rachidi ◽  
Davide Pavanello
Keyword(s):  
Electromagnetic Fields ◽  
Lightning Strikes ◽  
Tall Structures

Preliminary full-waveform inversion of lightning current using differential-integral loop measurement

2016 ◽  
Vol 23 (3) ◽  
pp. 1534-1545 ◽  
Author(s):  
Yi Long ◽  
Chenguo Yao ◽  
Yan Mi ◽  
Junkai Wang ◽  
Xuefeng Tang ◽  
...  
Keyword(s):  
Waveform Inversion ◽  
Full Waveform Inversion ◽  
Full Waveform ◽  
Lightning Current ◽  
Loop Measurement
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