Alternating Current Discharge Characteristics and Simulation Analysis of Rod-Plane Short Air Gaps under Salt Fog Conditions
Abstract
:1. Introduction
2. Experimental Work
2.1. Test Power Supply and Test Method
2.2. Artificial Climate Chamber and Air Gap Model
3. Experimental Results and Analysis
4. Simulation and Theoretical Analysis
4.1. Model Establishment
4.2. Simulation Results and Theoretical Analysis
5. Conclusions
- (1)
- Under AC voltage, corresponding to different gap distances the discharge voltage of the clean fog (18 μS/cm) condition is 15.1% to 35.5% higher than that of dry conditions, and the influence trend decreases with the increase of the gap distance.
- (2)
- With the increase of the conductivity of salt fog, the AC discharge voltage is 4.1% to 9.2% lower than that of clean fog conditions, and the influence trend of the conductivity on the AC discharge voltage is saturated with the increase of the conductivity.
- (3)
- As the simulation shows, the space electric field is seriously distorted by the salt fog. Due to the adsorption of free electrons by droplets in salt fog, the maximum value of electric field intensity on the axis between rod and plane under clean fog condition is 15.87% to 19.81% lower than that under dry conditions.
- (4)
- The simulation results show that the electric field intensity in air gap increases with the increase of the conductivity corresponding to different gap distances. As the conductivity of salt fog increases from 18 to 4000 μS/cm, the maximum value of the electric field intensity on the axis increased from 4.90% to 8.62%.
Author Contributions
Acknowledgments
Conflicts of Interest
References
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Voltage Type | Gap Distance | Discharge Voltage (kV) | ||||
---|---|---|---|---|---|---|
Dry | The Conductivity of Fog | |||||
18 μS/cm (Clean Fog) | 1000 (μS/cm) | 2750 (μS/cm) | 4000 (μS/cm) | |||
AC voltage | 5 cm | 21.7 | 29.4 | 28.7 | 28.1 | 26.7 |
10 cm | 35.9 | 43.3 | 42.6 | 41.5 | 39.3 | |
15 cm | 53.2 | 61.2 | 60.5 | 59.9 | 58.7 |
Gap Distance | Dry | 18 mS/cm (Clean Fog) | 1000 μS/cm | 2750 μS/cm | 4000 μS/cm |
---|---|---|---|---|---|
5 cm | (21.1, 22.3) | (28.4, 30.4) | (28.1, 29.3) | (27.3, 28.9) | (25.9, 27.5) |
10 cm | (34.8, 37.0) | (42.1, 44.5) | (41.4, 43.8) | (40.2, 42.8) | (38.0, 40.6) |
15 cm | (51.8, 54.6) | (60.2, 62.2) | (58.6, 62.4) | (58.4, 61.4) | (57.0, 60.4) |
Material | Aluminum (Rod Electrode) | Iron (Plane Electrode) | Air (Air Domain) | Water (Fog Drop) |
---|---|---|---|---|
Relative permittivity | 1 | 1 | 1 | 81 |
Conductivity (μS/cm) | 3.774 × 103 | 1.12 × 103 | 10−10 | 1.8 × 10−7 |
Gap Distance | The Maximum Value of Electric Field Intensity | ||
---|---|---|---|
Dry (ED) | Clean Fog (EC) | ||
5 cm | 0.6271 MV/m | 0.5029 MV/m | 19.81% |
10 cm | 0.9124 MV/m | 0.7433 M/m | 18.53% |
15 cm | 1.3414 MV/m | 1.1285 MV/m | 15.87% |
Gap Distance | The Maximum Value of Electric Field Intensity | |||
---|---|---|---|---|
Clean Fog (18 μS/cm) | 1000 μS/cm | 2750 μS/cm | 4000 μS/cm | |
5 cm | 0.5629 MV/m | 0.6089 MV/m | 0.6106 MV/m | 0.6114 MV/m |
10 cm | 0.8033 MV/m | 0.8667 MV/m | 0.8678 MV/m | 0.8682 MV/m |
15 cm | 1.1285 MV/m | 1.1830 MV/m | 1.1837 MV/m | 1.1838 MV/m |
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Liu, Y.; Jiang, S.; Zhong, Z.; Geng, J.; Lv, F. Alternating Current Discharge Characteristics and Simulation Analysis of Rod-Plane Short Air Gaps under Salt Fog Conditions. Energies 2018, 11, 2251. https://doi.org/10.3390/en11092251
Liu Y, Jiang S, Zhong Z, Geng J, Lv F. Alternating Current Discharge Characteristics and Simulation Analysis of Rod-Plane Short Air Gaps under Salt Fog Conditions. Energies. 2018; 11(9):2251. https://doi.org/10.3390/en11092251
Chicago/Turabian StyleLiu, Yunpeng, Shuo Jiang, Zheng Zhong, Jianghai Geng, and Fangcheng Lv. 2018. "Alternating Current Discharge Characteristics and Simulation Analysis of Rod-Plane Short Air Gaps under Salt Fog Conditions" Energies 11, no. 9: 2251. https://doi.org/10.3390/en11092251