Ground Potential Rise and Surge Protective Device Damage Caused by Initial Long Continuous Current Process in Triggered Lightning

Chen Shaodong; Zhang Yijun; Yan Xu; Du Sai; Lü Weitao; Zhang Yang

doi:10.11898/1001-7313.20200210

Vol.31, NO.2, 2020

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Chen Shaodong, Zhang Yijun, Yan Xu, et al. Ground potential rise and surge protective device damage caused by initial long continuous current process in triggered lightning. J Appl Meteor Sci, 2020, 31(2): 236-246. DOI: 10.11898/1001-7313.20200210.

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Chen Shaodong, Zhang Yijun, Yan Xu, et al. Ground potential rise and surge protective device damage caused by initial long continuous current process in triggered lightning. J Appl Meteor Sci, 2020, 31(2): 236-246. DOI: 10.11898/1001-7313.20200210.

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Ground Potential Rise and Surge Protective Device Damage Caused by Initial Long Continuous Current Process in Triggered Lightning

DOI: 10.11898/1001-7313.20200210

1.
Guangzhou Institute of Tropical and Marine Meteorology, CMA, Guangzhou 510080
2.
Department of Atmospheric and Oceanic Sciences & Institute of Atmospheric Sciences, Fudan University, Shanghai 200438
3.
Laboratory of Lightning Physics and Protection Engineering/State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081

Received Date: 2019-10-08
Rev Recd Date: 2020-01-17
Publish Date: 2020-03-31

Abstract

Abstract

In the field of grounding on electronic and electrical systems, damage effects of ground potential rise on electronic equipments are of great importance. Based on triggered lightning technology, an observation experiment is carried out on impacts of the ground potential rise in grounding grid upon surge protective device (SPD), especially on damage effects of initial long continuous current process of triggered lightning on SPD. It's found that upon injection of triggered lighting into grounding grid, SPD damage of rated flow rate is likely to occur under combined effects of initial long continuous current process and subsequent return stroke of triggered lightning. When the energy flowing through SPD is accumulated to a given extent, initial long continuous current process alone can also cause SPD damage. The impact on SPD is closely related to different waveforms of initial long continuous current process. When initial long continuous current process superposes ICCP with current of faster rise time and higher amplitude, energy flowing through SPD will increase rapidly, which is the most critical factor causing SPD damage in long continuous current process. The analysis of two cases indicates that, when the duration of initial long continuous current process and average current reaches about 100 ms and 200 A, the magnitude of discharge is 25 C, and energy flowing through SPD is up to about 1000 J, it is apt to cause 20 kA nominal discharge current and even higher SPD damage. Two processes (T0702 and T0726) of SPD are damaged by initial long continuous current of triggered lightning, when the peak value of current flowing through ground wire is 396.5 A and 392.7 A, respectively, the average current of main stage before damage is 23.6 A and 19.7 A, accounting for 10.8% and 6.7% of the average value of trigger lightning current, and the duration of current flowing through SPD above 50 A is 9.2 ms and 6.6 ms, respectively. When SPD is damaged, there is a sudden change in the residual voltage at both ends of SPD, which is obviously different from the disappearance of normal SPD residual voltage.
- triggered lightning;
- initial long continuous current;
- ground potential rise;
- surge protective device;
- damage

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Figures and Tables

Fig. 1 The schematic diagram of GPR's impact on SPD effect

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Fig. 2 Small range triggered lightning channel bottom current of T0702

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Fig. 3 The waveform of SPD residual voltage(a), triggered lightning current(b) and current flowing through SPD(c) due to the initial long continuous current of T0702

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Fig. 4 SPD residual voltage(a) and large range triggered lightning channel bottom current(b) of T0726

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Fig. 5 The waveform of SPD residual voltage(a), GPR voltage(b) and current flowing through SPD(c) due to the initial long continuous current of T0726

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Fig. 6 The energy accumulated in 0.5 ms and time domain of current flowing through SPD during T0702 and T0726

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Fig. 7 The quantity in 0.5 ms and time domain quantity accumulation curves of triggered lightning current during T0702 and T0725

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Table 1 Triggered lightning processes of GPR impulse to SPD caused by initial long continuous current processes

触发闪电过程	回击次数及电流峰值	初始长连续电流特征	SPD损坏时刻前的初始连续电流特征	SPD标称放电电流/kA
T0626	无回击	长连续电流长达480 ms，2 kA以上电流持续时间长达1.3 ms(只有小量程数据)		20
T0702	1次回击，电流幅值为19.1 kA	持续时间为433.8 ms，峰值电流为718.5 A，平均电流为146.1 A，中和电量为63.4 C	持续时间为149.2 ms，期间平均电流为173.8 A，泄放电量为25.9 C	20
T0725	4次回击，最大回击电流为26.1 kA	持续时间为313.6 ms，峰值电流为287.4 A，平均电流为106.8 A，中和的电量为33.5 C	初始连续电流期间未损坏，第1次回击出现异常	20
T0726	4次回击，最大回击电流峰值大于28.7 kA	持续时间为183.3 ms，峰值电流为1079.2 A，平均电流为176.4 A，中和的电量为32.3 C	持续时间为110.1 ms，平均电流为238.3 A，泄放电量为26.2 C	40

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