Riba Jordi-Roger, Moreno-Eguilaz Manuel, Ibrayemov Tamerlan, Boizieau Maxence
Campus Terrassa, Universitat Politècnica de Catalunya, 08222 Terrassa, Spain.
Materials (Basel). 2022 Feb 23;15(5):1677. doi: 10.3390/ma15051677.
Compared to their predecessors, the next generations of aircrafts will be more electrified, require more electrical power and operate at higher voltage levels to meet strict weight and volume constraints. The combined effect of low-pressure environments, increased voltage levels and compact designs intensifies the risks of premature insulation degradation due to electrical discharge activity. This paper studies the resistance to surface discharges of PTFE (polytetrafluoroethylene) and ETFE (ethylene tetrafluoroethylene), two insulation materials widely used in today's aircraft wiring systems due to their outstanding properties, such as a wide temperature operation range and a high dielectric strength. The study is carried out in a low-pressure chamber, which was pressurized within the pressure range of 10-100 kPa that includes most aircraft applications. There is a compelling need for experimental data to assess the resistance of insulation materials to surface discharges at a very early stage as a function of the environmental pressure. Data on resistance to surface discharges in low-pressure environments for aeronautical applications are lacking, while most standards for insulation systems are based on tests under standard pressure conditions. The results provided in this work can be useful to design wiring systems for future more electric aircrafts, as well as to design fault detection systems for an early detection and identification of faults related to surface discharges. Therefore, the data and analysis included in this paper could be of great interest to design and develop insulation systems for wiring systems and standard assessment methods, as well as to design fault detection strategies for the early detection and identification of surface discharges for future generations of more electric aircrafts.
与前代飞机相比，下一代飞机将更加电气化，需要更多电力，并在更高电压水平下运行，以满足严格的重量和体积限制。低压环境、更高电压水平和紧凑设计的综合影响加剧了因放电活动导致绝缘过早退化的风险。本文研究了聚四氟乙烯（PTFE）和乙烯-四氟乙烯共聚物（ETFE）这两种绝缘材料的表面放电抗性。由于其出色的性能，如宽工作温度范围和高介电强度，这两种材料在当今飞机布线系统中被广泛使用。该研究在一个低压舱中进行，该低压舱在10 - 100 kPa的压力范围内加压，这个压力范围涵盖了大多数飞机应用场景。迫切需要实验数据来在早期阶段评估绝缘材料在环境压力作用下的表面放电抗性。目前缺乏航空应用中低压环境下表面放电抗性的数据，而大多数绝缘系统标准是基于标准压力条件下的测试制定的。这项工作所提供的结果对于设计未来更多电动飞机的布线系统以及设计故障检测系统以早期检测和识别与表面放电相关的故障可能会有所帮助。因此，本文所包含的数据和分析对于设计和开发布线系统的绝缘系统及标准评估方法，以及为下一代更多电动飞机设计早期检测和识别表面放电的故障检测策略可能会非常有意义。
