Effects of Fiber and Copper Particles on Conductivity and Breakdown Characteristics of Natural Ester and Mineral Oil under DC Voltage
Abstract
:1. Introduction
2. Experiments
3. Experimental Results and Analysis
3.1. Movement and Accumulation Characteristics of Particles in Mineral oil and Natural Ester
3.2. Motion Trajectory Simulation of Particles in Mineral oil and Natural Ester
3.3. The Influence of Particles on the Current Density of Mineral Oil and Natural Ester
3.4. Influence of Particles on the DC Breakdown Voltage of Mineral Oil and Natural Ester
4. Conclusions
Author Contributions
Acknowledgments
Conflicts of Interest
References
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Parameters | Mineral Oil | Natural Ester |
---|---|---|
Density/g/cm3 (20 ℃) | 0.89 | 0.91 |
Viscosity/mm2/s (20 ℃) | 25.70 | 78.50 |
Relative permittivity (20 ℃, 50 Hz) | 2.2 | 3.1 |
Volume resistivity/Ω·m (20 ℃) | 4.68×1013 | 3.327×1010 |
Moisture content/ppm | 9 | 41 |
Acidity/mgKOH/g | 0.0056 | 0.01245 |
Tan (90 ℃, %) | 0.0536 | 0.5085 |
AC Breakdown voltage/kV (2.5 mm) | 65 | 78 |
Particle Type | Particles Concentration | ||||
---|---|---|---|---|---|
Fiber particles | 0.001% | 0.003% | 0.006% | 0.009% | 0.012% |
Copper particles | 0.1 g/L | 0.3 g/L | 0.6 g/L | 1 g/L | 1.5 g/L |
Fiber Particle Concentration (%) | Pure Oil | 0.001 | 0.003 | 0.006 | 0.009 | 0.012 |
α (kV) | 76.6 | 67.6 | 65.6 | 63.0 | 61.7 | 59.4 |
β | 26.5 | 25.0 | 35.9 | 39.1 | 35.3 | 30.7 |
50% probability failure (kV) | 75.6 | 66.6 | 64.9 | 62.5 | 61.1 | 58.6 |
5% probability failure (kV) | 68.4 | 60.0 | 60.4 | 58.4 | 56.7 | 53.8 |
Copper Particle Concentration (g/L) | Pure Oil | 0.1 | 0.3 | 0.6 | 1 | 1.5 |
α (kV) | 76.6 | 59.2 | 56.9 | 53.4 | 51.9 | 42.4 |
β | 26.5 | 13.5 | 16.5 | 27.2 | 21.6 | 19.9 |
50% probability failure (kV) | 75.6 | 57.6 | 55.6 | 52.7 | 51.0 | 41.6 |
5% probability failure (kV) | 68.4 | 47.5 | 47.5 | 47.9 | 45.2 | 36.5 |
Fiber Particle Concentration (%) | Pure Oil | 0.001 | 0.003 | 0.006 | 0.009 | 0.012 |
α (kV) | 78.6 | 71.5 | 70.1 | 68.8 | 64.8 | 62.7 |
β | 31.1 | 45.4 | 19.7 | 18.0 | 37.5 | 23.8 |
50% probability failure (kV) | 77.7 | 70.9 | 68.8 | 67.4 | 64.2 | 61.8 |
5% probability failure (kV) | 73.1 | 68.0 | 62.5 | 60.7 | 61.0 | 55.3 |
Copper Particle Concentration (g/L) | Pure Oil | 0.1 | 0.3 | 0.6 | 1 | 1.5 |
α (kV) | 78.6 | 66.8 | 64.4 | 61.0 | 58.8 | 46.3 |
β | 31.1 | 28.2 | 27.9 | 39.4 | 25.7 | 19.5 |
50% probability failure (kV) | 77.7 | 65.9 | 63.6 | 60.4 | 57.9 | 45.4 |
5% probability failure (kV) | 71.5 | 60.1 | 57.9 | 56.5 | 52.3 | 39.7 |
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Cheng, L.; Jiang, Y.; Dan, M.; Wen, H.; Li, Y.; Qin, W.; Hao, J. Effects of Fiber and Copper Particles on Conductivity and Breakdown Characteristics of Natural Ester and Mineral Oil under DC Voltage. Energies 2020, 13, 1818. https://doi.org/10.3390/en13071818
Cheng L, Jiang Y, Dan M, Wen H, Li Y, Qin W, Hao J. Effects of Fiber and Copper Particles on Conductivity and Breakdown Characteristics of Natural Ester and Mineral Oil under DC Voltage. Energies. 2020; 13(7):1818. https://doi.org/10.3390/en13071818
Chicago/Turabian StyleCheng, Lin, Yi Jiang, Min Dan, Hao Wen, Yanqing Li, Wei Qin, and Jian Hao. 2020. "Effects of Fiber and Copper Particles on Conductivity and Breakdown Characteristics of Natural Ester and Mineral Oil under DC Voltage" Energies 13, no. 7: 1818. https://doi.org/10.3390/en13071818