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High Voltage

Creepage and Clearance

Chris Wollbrink
High voltage systems on aircraft will be more commonplace as the eVTOL market “takes-off.” One safety aspect that often comes up is the separation of the high voltage; often, this comes down to creepage and clearance distance of these systems. Read more

A Brief Explanation of Thermal Runaway

Laura Wishart
In this article, Lectromec provides a basic summary of thermal runaway and the specific challenges it poses in aircraft, specifically regarding the shift toward more electric vehicles and the historically limited available space available for electronics on aircraft. Read more

Are New EWIS Regulations Needed for High Voltage EWIS?

Michael Traskos
High voltage power has been a hot topic in the aerospace industry for several years now. As programs have been getting closer to a marketable product, regulators are seeking to determine the regulatory basis for these new platforms. One question that has been raised in several committee and industry meetings, “Are New EWIS regulations needed for High Voltage Wiring Systems?” Read more

HV Connector Failures and Part Selection

Michael Traskos
With the current shift toward hybrid and electric aircraft, deeper understanding of high voltage connectors and their potential failure modes is required. In this article, we discuss failure modes and selection criteria for high voltage connectors on aircraft. Read more

Top 5 Articles of 2022

Michael Traskos
With the ramp-up of production across the entire supply chain, new vehicle concepts coming closer to being fielded, and continued research supporting the next generation of aircraft, 2022 was a big year for the aerospace industry. Find out what were the top five topics on Lectromec’s blog for 2022. Read more

AIR7502 and Future Implications for Aviation

Laura Wishart
The AIR7502 defines voltage levels for HV aircraft and components. The extent to which AIR7502 is incorporated into the aerospace industry remains unsure, but the implications of the document are worth considering even before the document’s use is determined. Read more

High Voltage Arc Tracking Requirements (Part 2)

Michael Traskos
In part 2 of this article series, we continue to discuss how arc track resistance testing as we know it must be re-evaluated as more HV systems with unique testing requirements lead the aviation industry moving forward. Read more

High Voltage Arc Tracking Requirements (Part 1)

Michael Traskos
Arc track resistance testing has been a staple of the aerospace industry for nearly 40 years. This originated from the issues raised in the 1980s with polyimide insulated wire. Since that time, test methods have evolved to assess and quantify the susceptibility of wires to carbon arc tracking and the ability to withstand electrical arcing events. Read more

EWIS High Voltage Certification

Michael Traskos
With the gradual industry implementation of high voltage EWIS systems in aviation, the demand for HV-specific safety standards is rapidly growing. High voltage OEMs currently use available industry standards, as applicable, but are still left with the task of developing and justifying their own system requirements. The SAE’s AS50881 standard, often considered the ‘go-to’ standard for OEMs, could benefit from proposed updates made to address the gaps for high voltage systems. Read more

Life-Limiting High Voltage Parts

Michael Traskos
Life-Limited EWIS parts can be useful where high voltage conditions make component degradation rates uncertain. Though accelerated aging can offer insight to the component’s condition, further observations of high-voltage systems will be needed for accurate degradation predictions. Read more