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Frontiers in Energy

ISSN 2095-1701

ISSN 2095-1698(Online)

CN 11-6017/TK

邮发代号 80-972

2019 Impact Factor: 2.657

Frontiers in Energy  2016, Vol. 10 Issue (2): 213-226   https://doi.org/10.1007/s11708-016-0398-6
  本期目录
Choosing configurations of transmission line tower grounding by back flashover probability value
Dmitry KUKLIN()
Centre for Physical and Technological Problems of Energy in Northern Areas, Apatity 184209, Russia
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Abstract

There is a considerable number of works devoted to electrical characteristics of grounding. These characteristics are important in general. However, in application to grounding of transmission line towers they are not enough to determine what grounding construction is preferable in some particular case, because these characteristics are calculated or measured apart from the grounded object, and only limited number of current (or voltage) source waveforms is used. This paper indicates reasons in favor of the fact that to choose the optimum design of grounding, the calculation model should include the tower as it is. The probability of back flashover, which provides both qualitative and quantitative estimate of the grounding structure efficiency, can be taken as the criterion for the grounding design. The insulation flashover probability is calculated on the basis of engineering method, which evaluates breakdown strength of insulation for nonstandard waveshapes, and probability data on lightning currents. Different approaches are examined for identifying the back flashover probability, as not only amplitudes but also other parameters can be taken into account. Finite-difference time-domain method is used for calculations of transients. It is found that lightning current waveform can greatly influence calculated back flashover probability value.

Key wordsgrounding    transmission line tower    back flashover probability    FDTD method
收稿日期: 2015-03-26      出版日期: 2016-05-27
Corresponding Author(s): Dmitry KUKLIN   
 引用本文:   
. [J]. Frontiers in Energy, 2016, 10(2): 213-226.
Dmitry KUKLIN. Choosing configurations of transmission line tower grounding by back flashover probability value. Front. Energy, 2016, 10(2): 213-226.
 链接本文:  
https://academic.hep.com.cn/fie/CN/10.1007/s11708-016-0398-6
https://academic.hep.com.cn/fie/CN/Y2016/V10/I2/213
Fig.1  
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Fig.5  
Fig.6  
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Fig.13  
Probability calculation approach Stroke Current function No. of grounding (Fig. 2)
1 2 3 4
First First stroke CIGRE (Eq. (5)) 0.25 0.24 0.22 0.21
Subsequent stroke Heidler (Eq. (8)) 0.21 0.21 0.21 0.21
Second First stroke Ramp (Eq. (3)) 0.44 0.44 0.42 0.42
Tab.1  
Stroke Current function No. of grounding (Fig. 6)
1 2 3 4
First stroke CIGRE (Eq. (5)) 0.43 0.38 0.32 0.41
Heidler (Eq. (4)) 0.59 0.55 0.46 0.60
Ramp (Eq. (3)) 0.73 0.71 0.63 0.76
Subsequent stroke Heidler (Eq. (8)) 0.26 0.26 0.23 0.28
Total probability CIGRE (Eq. (5)) and Heidler (Eq. (8)) 0.69 0.66 0.60 0.69
Tab.2  
Probability calculation approach Correlation coefficient No. of grounding (Fig. 6)
1 2 3 4
First 0 0.42 0.38 0.33 0.40
0.160 0.43 0.39 0.34 0.41
0.5 0.43 0.40 0.35 0.42
0.846 0.44 0.41 0.36 0.43
Second 1 0.44 0.41 0.36 0.43
Tab.3  
Phase Phase voltage/kV No. of grounding (Fig. 6)
1 2 3 4
Upper ?89.8 0.35 0.30 0.25 0.33
0 0.43 0.38 0.32 0.41
89.8 0.53 0.47 0.41 0.50
Middle ?89.8 0.24 0.19 0.15 0.22
0 0.31 0.26 0.20 0.29
89.8 0.40 0.34 0.28 0.37
Lower ?89.8 0.14 0.11 0.07 0.13
0 0.20 0.15 0.11 0.18
89.8 0.27 0.22 0.16 0.25
Tab.4  
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