Investigation of Aircraft Powerline Transients. Phase 4
Abstract
An investigation into the extent and nature of switching transients on aircraft powerlines showed that both 'on ground' and 'in-flight' conditions are similar. The data also indicated that, of the transients resulting from switching operations and lasting less than 50 microseconds, more than 95% are similar to damped sinusoidal waveforms or unipolar waveforms; all are below 200V peak on the 115 Vac bus (400 Hz) and 24V peak on the 28 Vdc bus; 94% are below 25V on the 115 Vac (400 Hz) bus; and 82% are below 0.5V on the 28 Vdc bus. Based on the findings, for test method CE07 in MIL-STD-461, Part 2 (Aircraft), the present levels are adequate and should be retained. For test method CS06: The requirements should be modified to include two damped sinusoidal waveforms having a Q of 6, frequencies of 1.0 and 10.0 MHz and a peak amplitude at 200V for 115 Vac, 400 Hz powerlines. This requirement should also be added for 28 Vdc lines; however, the amplitude should be reduced to 24V peak. The unipolar pulse with the present time durations should be retained except that the amplitude for the dc powerline should be reduced to 24V peak.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1988
- Accession Number
- ADA198918
Entities
People
- L. R. Bachman