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Detecting and Locating Corona Discharges in Low-Pressure Aircraft Environments Using Optical Sensors

P. Bas-Calopa(1), J.-R. Riba(1) and M. Moreno-Eguilaz(2)

1. Department of Electrical Engineering, Universitat Politècnica de Catalunya, Terrassa (Spain)

2. Department of Electronics Engineering, Universitat Politècnica de Catalunya, Terrassa (Spain)

2026-01-20

Today, there is a clear trend toward electrificationof transportation systems, including aircraft. Due to the enormous power requirements, they must operate at high voltages. However, the combined effect of higher voltage levels and low pressure environments is conducive to the occurrence of electrical discharges in electrical systems. Therefore, there is an urgent need to develop cost-effective systems to detect the discharges in the early stages before major failures can occur. This paper compares two optical sensors for early discharge detection in a simulated aircraft environment. The experimental study is performed in a low pressure chamber using a needle plane electrode. The pressure is changed from that corresponding to ground level to that corresponding to flight altitude, i.e., from 100 kPa to 20 kPa. The effect of the supply frequency is also studied, since modern aircraft operate in a wide range of frequencies up to about 800 Hz. Both variables, especially pressure, have shown significant effects on the CIV value. The results have also shown a similar sensitivity of both sensors for all the experimental conditions analysed, allowing a fast and sensitive detection and localization of incipient electrical discharge activity.

Key words: Electrical discharges, corona effect, ultraviolet sensors, electric aircraft, electrical mobility.

[1] A. Allca-Pekarovic, P. J. J. Kollmeyer, P. Mahvelatishamsabadi, T. Mirfakhrai, P. Naghshtabrizi, and A. Emadi, “Comparison of IGBT and SiC Inverter Loss for 400V and 800V DC Bus Electric Vehicle Drivetrains,” in ECCE 2020 - IEEE Energy Conversion Congress and Exposition, 2020, pp. 6338–6344.

[2] J.-R. Riba, M. Moreno-Eguilaz, T. Ibrayemov, and M. Boizieau, “Surface Discharges Performance of ETFE- and PTFE-Insulated Wires for Aircraft Applications,” Mater. 2022, Vol. 15, Page 1677, vol. 15, no. 5, p. 1677, Feb. 2022.

[3] B. Sarlioglu and C. T. Morris, “More Electric Aircraft: Review, Challenges, and Opportunities for Commercial Transport Aircraft,” IEEE Trans. Transp. Electrif., vol. 1, no. 1, pp. 54–64, 2015.

[4] H. El Bayda et al., “Energy losses from an arc tracking inaeronautic cables in DC circuits,” IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 1, pp. 19–27, Feb. 2013.

[5] “ISO 1540:2006 Aerospace — Characteristics of aircraft electrical systems.” p. 56, 2006.

[6] “What Are the Disadvantages of Kapton Insulated Wire? - InterConnect Wiring.” .

[7] J.-R. Riba, M. Moreno-Eguilaz, and J. A. Ortega, “Arc Fault Protections for Aeronautic Applications: A Review Identifying the Effects, Detection Methods, Current Progress, Limitations, Future Challenges, and Research Needs,” IEEE Trans. Instrum. Meas., p. 1, 2022.

[8] L. Lusuardi, A. Rumi, A. Cavallini, D. Barater, and S. Nuzzo, “Partial Discharge Phenomena in Electrical Machines for the More Electrical Aircraft. Part II: Impact of Reduced Pressures and Wide Bandgap Devices,” IEEE Access, vol. 9, pp. 27485–27495, 2021.

[9] J.-R. Riba, Á. Gómez-Pau, and M. Moreno-Eguilaz, “Experimental Study of Visual Corona under Aeronautic Pressure Conditions Using Low-Cost Imaging Sensors,” Sensors, vol. 20, no. 2, p. 411, Jan. 2020.

[10] R. Hosseini and H. Taherian, “Natural convection heat transfer from a vertical plate to air at very low pressure,” Trans. Can. Soc. Mech. Eng., vol. 28, no. 2 B, pp. 309–319, 2004.

[11] L. Lusuardi, A. Rumi, G. Neretti, P. Seri, and A. Cavallini, “Assessing the severity of partial discharges in aerospace applications,” in Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP, 2019, pp. 267–270.

[12] A. Rumi, J. G. G. Marinelli, D. Barater, A. Cavallini, and P. Seri, “The Challenges of Reliable Dielectrics in Modern Aerospace Applications: The Hazard of Corona Resistant Materials,” IEEE Trans. Transp. Electrif., vol. 8, no. 4, pp. 4646–4653, Dec. 2022.

[13] D. Ma, L. Jin, J. He, and K. Gao, “Classification of partial discharge severities of ceramic insulators based on texture analysis of UV pulses,” High Volt., vol. 6, no. 6, pp. 986–996, Dec. 2021.

[14] P. Bas-Calopa, J. R. Riba, and M. Moreno-Eguilaz, “Corona Discharge Characteristics under Variable Frequency and Pressure Environments,” Sensors 2021, Vol. 21, Page 6676, vol. 21, no. 19, p. 6676, Oct. 2021.

[15] J.-R. Riba, Á. Gómez-Pau, and M. Moreno-Eguilaz, “Insulation Failure Quantification Based on the Energy of Digital Images Using Low-Cost Imaging Sensors,” Sensors, vol. 20, no. 24, 2020.

[16] P. Schreiber, T. Dang, T. Pickenpaugh, G. A. Smith, P. Gehred, and C. W. Litton, “Solar-blind UV region and UV detector development objectives,” in Optoelectronics ’99 - Integrated Optoelectronic Devices, 1999, vol. 3629, pp. 230–248.

[17] J.-R. Riba, M. Moreno-Eguilaz, M. Boizieau, and T. Ibrayemov, “Performance Evaluation of Solar-Blind Gas-Filled Sensors to Detect Electrical Discharges for Low-Pressure Aircraft Applications,” Sensors 2022, Vol. 22, Page 492, vol. 22, no. 2, p. 492, Jan. 2022.

[18] Z. Guo, Q. Ye, F. Li, and Y. Wang, “Study on corona discharge spatial structure and stages division based on visible digital image colorimetry information,” IEEE Trans. Dielectr. Electr. Insul., vol. 26, no. 5, pp. 1448–1455, Oct. 2019.

[19] F. W. Peek, “The law of corona and the dielectric strength of air,” Proc. Am. Inst. Electr. Eng., vol. 30, no. 7, pp. 1485–1561, 1911.

[20] W. Linder and H. Steele, “Estimating voltage breakdown performance of high-altitude antennas,” in WESCON/59 Conference Record, 1959, vol. 3, pp. 9–16.