Onset Corona Field Based on Isolated Metal Tip

Tan Yongbo; Zhu Junru; Li Xiangchao; Liang Zhongwu; Guo Xiufeng

Vol.25, NO.3, 2014

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2014 > 25(3): 339-346

Tan Yongbo, Zhu Junru, Li Xiangchao, et al. Onset corona field based on isolated metal tip. J Appl Meteor Sci, 2014, 25(3): 339-346.

Citation:

Tan Yongbo, Zhu Junru, Li Xiangchao, et al. Onset corona field based on isolated metal tip. J Appl Meteor Sci, 2014, 25(3): 339-346.

Tan Yongbo, Zhu Junru, Li Xiangchao, et al. Onset corona field based on isolated metal tip. J Appl Meteor Sci, 2014, 25(3): 339-346.

Citation:

Tan Yongbo, Zhu Junru, Li Xiangchao, et al. Onset corona field based on isolated metal tip. J Appl Meteor Sci, 2014, 25(3): 339-346.

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Onset Corona Field Based on Isolated Metal Tip

Tan Yongbo^{1,2
,
,},
Zhu Junru^1,2,
Li Xiangchao^1,2,
Liang Zhongwu^1,2,
Guo Xiufeng^1,2

1.
Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing 210044
2.
Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science & Technology, Nanjing 210044

Received Date: 2013-05-28
Rev Recd Date: 2014-01-08
Publish Date: 2014-05-31

Abstract

Abstract

Corona discharges characterized by much lower current densities are often generated in a strong atmospheric electric field. What's more, corona discharges are very important because the corona charge layers can change the distribution of the electric field near the ground and affect conditions of the initiation and development of an upward leader near different tall objects. Therefore, corona discharges have attracted the attention of scholars at home and abroad, especially in the onset corona field. However, how to effectively show corona emission threshold is still a difficult problem in the study of atmospheric electricity.In order to obtain the electric field strength at the tip of metal in the case of corona discharge, the onset corona voltages must be obtained by laboratory test for different heights, shapes and materials of metal tips which are arranged on the middle of lower plate of two parallel metal plates. Dimensions of two horizontal plates are 1.2 m by 1.2 m and the distance between them is 1 m. Then environmental threshold electric fields are calculated for different heights, shapes and materials of metal tips. The two-dimensional Poisson equation is solved using finite element method and the corona emission thresholds at the tip of different types of metal tips are obtained.Effects on threshold electric fields by the height, material and shape are discussed, respectively. The following conclusions can be drawn from the experimental study. First, the environmental threshold fields are basically a linear decrease with heights of metal. The environmental threshold fields decrease first and then increase when metal tips are becoming sharp increasingly. Second, the height and shape of mental tips have no effects on corona emission threshold at the tip of metal tips. The corona threshold at the tip of mental tip is a constant. Finally, the corona triggering threshold is determined which is E_c=158.75 kV·m^-1 and the fitting function between corona emission threshold and spatial resolution is given. It will provide a reference for the judgment of starting moment of corona discharge for the future numerical simulation of corona discharge.
- corona discharge;
- laboratory simulation;
- corona field threshold;
- finite element;
- spatial resolution

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References(33)

Figures and Tables

Fig. 1 Experiment with different heights of the lightning rod (a) and different shapes of lightning rod (b)

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Fig. 2 The change of environmental field strength when iron lightning rod trigger corona discharge with heights (a) and with H_b/D(b)

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Fig. 3 The corona trigger threshold at the tip of metal cusps with different spatial resolutions

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Table 1 Corona voltage value of iron material rods with different heights and different shapes (unit:kV)

铁棒类型	第1次	第2次	第3次	第4次	第5次	平均值
H_a=25 cm	-25.6	-26.0	-26.3	-25.7	-26.1	-25.94
H_a=30 cm	-23.6	-23.2	-23.4	-22.9	-23.0	-23.22
H_a=39 cm	-20.6	-20.1	-20.3	-20.6	-20.0	-20.32
H_a=50 cm	-17.6	-17.1	-17.5	-17.8	-17.6	-17.52
H_a=30 cm，H_b=2.3 cm	-22.4	-21.9	-22.6	-22.3	-22.4	-22.32
H_a=30 cm，H_b=3.0 cm	-23.3	-23.5	-23.3	-23.7	-23.1	-23.38
H_a=30 cm，H_b=4.5 cm	-24.1	-24.4	-24.1	-23.9	-24.2	-24.14
H_a=30 cm，H_b=6.0 cm	-25.6	-25.1	-25.4	-24.9	-25.1	-25.22

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Table 2 Corona voltage value of lightning rod with the same shape, the same height and different materials (unit:kV)

材质	第1次	第2次	第3次	第4次	第5次	平均值
铁棒	-23.6	-23.2	-23.4	-22.9	-23.0	-23.22
铝棒	-22.6	-22.9	-23.2	-22.5	-22.7	-22.78
铜棒	-22.9	-22.3	-22.6	-22.3	-22.6	-22.54

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Table 3 Corona field threshold of iron material rods with different heights and different shapes (unit:kV·m^-1)

类型	第1次	第2次	第3次	第4次	第5次	平均值
H_a=25 cm	132.510	134.581	136.133	133.028	135.098	134.270
H_a=30 cm	135.715	133.415	134.565	131.690	132.265	133.529
H_a=39 cm	136.773	133.453	134.781	136.773	132.789	134.914
H_a=50 cm	138.779	134.836	137.990	140.356	138.779	138.148
H_a=30 cm, H_b=2.3 cm	134.861	136.065	131.850	134.258	134.861	134.379
H_a=30 cm, H_b=3.0 cm	135.335	136.496	135.335	137.658	134.173	135.799
H_a=30 cm, H_b=4.5 cm	133.992	135.660	133.992	132.880	134.548	134.215
H_a=30 cm, H_b=6.0 cm	138.772	136.062	137.688	134.977	136.062	136.712

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Table 4 The relative error of corona field threshold of iron metal objects with different shapes and different heights (unit:%)

类型	第1次	第2次	第3次	第4次	第5次
H_a=25 cm	1.976	0.444	0.704	1.593	0.061
H_a=30 cm	0.395	1.307	0.456	2.583	2.158
H_a=39 cm	1.178	1.279	0.296	1.178	1.770
H_a=50 cm	2.662	0.255	2.078	3.829	2.662
H_b=2.3 cm	0.237	0.654	2.465	0.683	0.237
H_b=3.0 cm	0.114	0.973	0.114	1.832	0.746
H_b=4.5 cm	0.880	0.354	0.880	1.702	0.469
H_b=6.0 cm	2.658	0.652	1.855	0.151	0.652

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Table 5 Corona field threshold of lightning rod with the same shape and the same height and different materials (unit:kV·m^-1)

类型	第1次	第2次	第3次	第4次	第5次	平均值
铁棒	135.715	133.414	134.565	131.690	132.265	133.529
铝棒	129.965	131.690	133.415	129.380	130.540	130.980
铜棒	131.690	128.245	129.965	128.240	129.965	129.621

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Table 6 The relative error of corona field threshold of metal objects with different materials (unit:%)

类型	第1次	第2次	第3次	第4次	第5次
铁棒	0.395	1.307	0.456	2.583	2.158
铝棒	3.859	2.582	1.307	4.291	3.433
铜棒	2.582	5.121	3.859	5.435	3.859

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