Estimation of lightning current wave front duration by the lightning performance of Japanese EHV transmission lines

1993 ◽  
Vol 8 (2) ◽  
pp. 660-671 ◽  
Author(s):  
T. Udo
Keyword(s):  
Wave Front ◽  
Transmission Lines ◽  
Lightning Current ◽  
Current Wave ◽  
Front Duration

scholarly journals Study on the Application of Optical Current Sensor for Lightning Current Measurement of Transmission Line

Sensors ◽  
2019 ◽  
Vol 19 (23) ◽  
pp. 5110
Author(s):  
Jin-ming Ge ◽  
Yan Shen ◽  
Wen-bin Yu ◽  
Yue Han ◽  
Fang-wei Duan
Keyword(s):  
Transmission Lines ◽  
Material Selection ◽  
Current Data ◽  
Measurement Sensitivity ◽  
Transmission Systems ◽  
Current Sensing ◽  
Measurement Capability ◽  
Lightning Current ◽  
Sensing Technology ◽  
Sensing Material

Accurate and reliable lightning current data are the basis of lightning protection design. To measure lightning current data at different measurement locations in a transmission system, the limitations of traditional lightning current sensors are analyzed, and optical current sensing technology is adopted, which has the advantages of no magnetic saturation and no bandwidth limitation. Compared with traditional application environments, the sensing technology is used in special environments in transmission systems. This paper analyzes the influence of environmental factors on sensors, and combines the extreme environmental requirements, such as temperature and insulation requirements, to study the sensor. Starting from the sensitivity, the sensing characteristics of the sensor are analyzed. The sensor is designed according to three aspects: sensing material selection, spatial measuring position, and sensing material size optimization, such that it can satisfy the different measurement requirements of towers, overhead ground wires, and transmission lines, respectively. The experiments indicate that the developed sensors can meet the measurement sensitivity requirements of different types of lightning strikes. The experimental results of sensors exhibit a reasonable amplitude measurement accuracy, linearity, and waveform measurement capability. These results provide important theoretical and experimental bases for the application of optical current sensing technology to the measurement of the lightning current of transmission systems.

scholarly journals Determination of Cumulative Distribution Function of the Crest Value of the Lightning Current Circulating Through Line Surge Arresters

2020 ◽  
Vol 69 (2) ◽  
pp. 11-18
Author(s):  
Goran Levačić ◽  
Alain Xémard ◽  
Miroslav Mesić
Keyword(s):  
Distribution Function ◽  
Transmission Line ◽  
Transmission Lines ◽  
Cumulative Distribution Function ◽  
Cumulative Distribution ◽  
Lightning Strikes ◽  
Surge Arresters ◽  
Lightning Current ◽  
Calculation Results

For the selection and design of line surge arresters (LSA), it is essential to know the characteristics of the lightning current circulating through LSA. When lightning strikes a transmission line, only a part of the lightning current circulates through LSA.This part mostly depends on the point of impact, and the characteristic of the lightning stroke current. The determination of the cumulative distribution function of the lightning current circulating through arresters is presented in first part of the paper. It can be applied on transmission lines where LSAs will be installed to protect the line against the effect of atmospheric discharges.Second part of paper presents the calculation results of the cumulative distribution function of the lightning current circulating through arresters for particular 110 kV transmission line located in an area with high lightning activity.

scholarly journals Estimation of voltage waveform at top of transmission line tower struck by lightning of negative and positive polarity

2021 ◽  
Vol 3 (1(59)) ◽  
pp. 34-39
Author(s):  
Yevgeniy Trotsenko ◽  
Mandar Madhukar Dixit ◽  
Volodymyr Brzhezitsky ◽  
Yaroslav Haran
Keyword(s):  
Transmission Line ◽  
Power Transmission ◽  
Circuit Simulation ◽  
Lightning Strike ◽  
Power Transmission Line ◽  
Entire Area ◽  
Current Impulse ◽  
Lightning Current ◽  
Current Wave ◽  
Maximum Voltage

The object of research is a circuit that simulates a lightning strike to a tower of 220 kV power transmission line, taking into consideration the reflection of a current wave from 10 nearest towers. Computation of the voltage arising at the top of the struck tower is necessary further to determine the lightning performance of transmission line by various methods. The lightning current has several maxima, in the case of a positive impulse polarity and, accordingly, several minima, in the case of a negative polarity, which are generally being called peaks. In addition, the lightning current impulse has a non-constant steepness in the entire area of current rise up to the first peak. The approximation of the real lightning current by simplified mathematical expressions cannot take into account all its real features. For a more detailed study of transient processes caused by thunderstorm activity, there is a need to use oscillograms of real lightning currents when modeling. The problem of determining the voltage at the top of the stricken transmission line tower was solved using circuit simulation. For an in-depth study of how the shape of the lightning current impulse affects the shape of the voltage at the top of the tower struck, digitized oscillograms of real lightning currents were used. The simulation was carried out for 7 negative lightning impulses with the first peak varying from –33.380 kA to –74.188 kA. In the case of positive lightning, 3 oscillograms were used with the first peak varying from +38.461 kA to +41.012 kA. The article shows that the shape of the front of the lightning current impulse and the amplitude of the first peak of the lightning current have a decisive effect on the maximum voltage value at the top of a power transmission line tower struck by lightning. The maximum voltage occurs precisely at the front of the current wave before the first peak of the lightning current. Therefore, the back flashover of the insulation from the tower to the phase conductor is most likely at a moment in time at the front of the current wave. By the time the maximum current is reached, the voltage at the top of the tower will be reduced by several tens of percent, compared to the maximum voltage at the tower, which occurs much earlier at the front of the current wave. The conducted research contributes to the development of methods for calculating the lightning performance of power lines and extends the scope of application of circuit simulation programs.

scholarly journals Experimental Investigation of Surge Propagation Characteristics on a Substation Grounding System

2021 ◽  
Vol 2096 (1) ◽  
pp. 012113
Author(s):  
V V Kolobov ◽  
M B Barannik ◽  
V V Ivonin
Keyword(s):  
Wave Propagation ◽  
Transmission Lines ◽  
Propagation Velocity ◽  
Electromagnetic Waves ◽  
Mesh Size ◽  
Correct Choice ◽  
Residual Voltage ◽  
Grounding System ◽  
Grounding Grid ◽  
Current Wave

Abstract With the correct choice of the arrester by voltage class and compliance with the calculated protective distance without taking into account the propagation velocity of the current wave on the grounding grid, overvoltages exceeding discharge or residual voltage may occur on the protected equipment, in particular the transformer. Thus, when calculating the installation of the arrester that protects the substation from incoming lightning surges from a transmission lines, it is necessary to take into account the propagation of the current wave on the grounding grid. The propagation velocity of electromagnetic waves in a 150 kV substations grounding grid was measured. The measured wave propagation velocities are in the range of 50–100⋅106 m/s. Thus, the obtained velocity of wave propagation on the grounding grid used in service is several times less than the speed of light. The measured value correlates well with similar experiments conducted for buried conductors located in soils with similar parameters and the results of mathematical modeling for a grounding grid having similar dimensions and mesh size.

The influence of wave front duration of impulse voltage on creeping discharges along aerial insulated wire

2004 ◽  
Vol 147 (2) ◽  
pp. 30-38 ◽  
Author(s):  
Toshiyuki Nishi ◽  
Ryoichi Hanaoka ◽  
Shinzo Takata ◽  
Toshio Miyamoto
Keyword(s):  
Wave Front ◽  
Impulse Voltage ◽  
Front Duration
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