Improved Design of Fuse Tube for Environmental Protection Cabinet Based on Electric-Field Simulation
Abstract
:1. Introduction
2. Electric-Field Simulation with Fuse Tube
2.1. Static-Field Simulation Analysis Process
2.2. Theoretical Basis of Electric-Field
2.3. The Establishment of Simulation Model
2.4. Electric-Field Simulation and Result Analysis
- (1)
- Because the installation led to many air gaps in the plug, these air gaps and the surrounding conductors and silicone rubber formed a high potential, insulation and air three different media intersection, resulting in the concentration of the field in the plug, easily causing insulation breakdown.
- (2)
- The ring rod and other metals inside the fuse tube had high potential, and the ground rod had low potential. The potential passed through the air from a high potential to a low potential, and so, the air field around the ground rod and connecting rod was very strong.
3. Design of Improvement Scheme of Fuse Tube
3.1. Plug Part Improvement
3.1.1. Improvement of Air Gap between Plug and Alloy Cover
3.1.2. The Screw Inside the Plug Is Improved
3.2. Ground Rod Partial Improvement
3.2.1. Improvement of Grounding Connecting Rod
3.2.2. Ground Rod Front-End Air Zone Improvement
3.2.3. Ground Rod Rear-End Air Zone Improvement
4. Partial Discharge Test of Fuse Tube
5. Conclusions
- (1)
- Brush conductive paint on the silicone rubber surface adjacent to the alloy cover to form equipotentiality, so as to avoid the formation of a high potential, insulation, and air intersection, which results in a gas gap discharge.
- (2)
- Brush conductive paint on the silicone rubber wall around the slit of the screw in the plug, which forms the suspension potential, equipotentiality, and the uniform electric-field with the screw.
- (3)
- Add a ground shielding net to the fuse tube directly below the grounding connecting rod. The metal shielding structure adopts epoxy resin through integrated pouring so that the potential shield is inside the fuse tube. Then, add a small 4 mm high boss on the surface of the fuse tube above the shielding ring; the lower end of the epoxy shell grows to cover the fuse tube front boss, increasing the epoxy thickness to prevent breakdown.
- (4)
- Add a 40 mm × 133.5 mm earth shielding net inside the fuse tube that is 8 mm away from the surface of the high-potential ring rod, and shield the electric-field inside the epoxy.
- (5)
- Add a 42.5 mm-long and 17 mm-radius ground shielding ring at the end of the grounding rod to avoid electric-field concentration and insulation breakdown.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
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Material | Relative Dielectric Constant | Average Breakdown Field Strength (kV/mm) |
---|---|---|
Air | 1.0 | 3.0 |
Silicone rubber | 3.6 | 25.0 |
Epoxy resin | 4.5 | 30.0 |
Radius of the Ground Shielding Ring (mm) | Length of the Ground Shielding Ring (mm) | Maximum Field Strength (kV/mm) |
---|---|---|
15.5 | 40.5 | 3.48 |
15.5 | 42.5 | 3.05 |
15.5 | 44.5 | 3.38 |
15.5 | 48.5 | 3.60 |
15.5 | 52.5 | 3.10 |
15.5 | 56.5 | 3.67 |
17.0 | 42.5 | 2.83 |
Test Sample Number (mm) | Measured Discharge (pC) | Initial Discharge Voltage (kV) |
---|---|---|
A01 | 0.5 | 19.4 |
A02 | 0.8 | 18.0 |
A03 | 2.8 | 18.3 |
B01 | 130 | 10.5 |
B02 | 114 | 11.2 |
B03 | 122 | 10.8 |
C01 | 0.6 | 21.2 |
C02 | 0.5 | 23.0 |
C03 | 1.2 | 19.3 |
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You, Y.; Qiao, R.; Li, S.; Zhou, S.; Zhou, S.; Peng, Z. Improved Design of Fuse Tube for Environmental Protection Cabinet Based on Electric-Field Simulation. Energies 2023, 16, 5242. https://doi.org/10.3390/en16145242
You Y, Qiao R, Li S, Zhou S, Zhou S, Peng Z. Improved Design of Fuse Tube for Environmental Protection Cabinet Based on Electric-Field Simulation. Energies. 2023; 16(14):5242. https://doi.org/10.3390/en16145242
Chicago/Turabian StyleYou, Yimin, Rui Qiao, Shaojie Li, Shunxiong Zhou, Shenjun Zhou, and Zhenbo Peng. 2023. "Improved Design of Fuse Tube for Environmental Protection Cabinet Based on Electric-Field Simulation" Energies 16, no. 14: 5242. https://doi.org/10.3390/en16145242