A new 'micro-layered' insulation is 10 times thinner than standard wire coatings but can handle four times the voltage.
April 15, 2026
Original Paper
Performance Enhancement of MVDC Aircraft Cables Using Micro-Multilayer Insulation Under Low-Pressure Conditions
arXiv · 2604.10238
The Takeaway
If we want all-electric planes, we need wires that can carry massive amounts of power without catching fire or being too heavy to fly. This paper reveals a micro-multilayer insulation (MMEI) that is only 10% the thickness of current materials but survives 20,000 volts in the low-pressure environment of high altitudes. Standard insulation fails at 5,000 volts in those same conditions. By using thin layers that trap electrical charges before they can cause a spark, this tech removes a major engineering roadblock for electric aviation. It’s the difference between an electric plane being a heavy, dangerous prototype and a light, efficient commercial reality.
From the abstract
The development of medium-voltage direct current (MVDC) cable systems for wide-body all-electric aircraft (AEA) requires insulation technologies capable of operating reliably under reduced-pressure environments. Conventional underground cable insulation, designed for atmospheric conditions, exhibits degraded partial discharge (PD) and dielectric performance at low pressure, limiting its applicability to aerospace systems. This work presents a controlled experimental comparison between a conventi