Accession Number : ADA112612

Title :   Protection of Advanced Electrical Power Systems from Atmospheric Electromagnetic Hazards.

Descriptive Note : Final rept. 15 Jun 79-15 Oct 81,


Personal Author(s) : Sommer,David L

PDF Url : ADA112612

Report Date : Dec 1981

Pagination or Media Count : 233

Abstract : This report contains results of a two-phase study program investigating the effects of lightning strikes on aircraft and the resulting transients coupled onto the electrical systems. The historical background and overall scope of the study are contained in Section I of the final report. Section II of this report defines the lightning threat and develops electrical system math models. Section III evaluates the normal design of aircraft for inherent hardness. Included in this assessment are wire routing, equipment location, fiber optics, threat level comparisons and the evaluation of specific electrical circuits (e.g., generators, converters, beacon lights, etc.). Section IV of the report analyzes the effects of using add-on protection to suppress induced transients on the electrical system. Protection schemes analyzed include cable shielding, linear protection devices, non-linear protection devices and conductive coatings applied to the aircraft skin. Section V of the final report contains a summary of the design guide which provides the electrical systems engineer with a means of selecting the most appropriate lightning hardening techniques for his design. Section VI discusses reliability/maintainability, system safety and design to cost considerations. Section VII of the report contains the conclusions and recommendations of the study which include protection criteria to develop a lightning tolerant electrical system.

Descriptors :   *Aircraft, *Electrical equipment, *Protection, *Lightning, Vulnerability, Hardening, Mathematical models, Computerized simulation, Radar, Electric power, Circuits, Jet fighters, Transport aircraft, Electromagnetic shielding, Filters, Protective coatings

Subject Categories : Attack and Fighter Aircraft
      Transport Aircraft
      Atmospheric Physics
      Electromagnetic Shielding

Distribution Statement : APPROVED FOR PUBLIC RELEASE