Electrical Short Circuit/Arcing of Aged Aircraft Wiring

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$Atago Co., Ltd. Salinity Refractometer, Model S-10 Instruction Manual$

Test 18 & 202 Bundles: four wires each (three BMS 42/1/1-20; one 3 BMS 42A/8/1-18)Metal Shaving: Two Aluminum 7075 shavings placed ~1 apart between bundlesCircuit Resistance: 1 OhmGenerator: 3 phase, 400Hz, 120 line to neutral (208 line to line), 10 kVA.Observations Test 18 Test 20Flash No NoStrong Arcing No NoCircuit Breakers Tripped No NoDamage Length 0 0# Wires Failing Wet Dielectric Test 0 of 8 0 of 8These tests were similar to tests 17 &19 except that aluminum 7075 shavings were usedinstead of steel shavings. One problem encountered was that, even with relatively thick shavings(i.e. 47 mils by 28 mils), the shaving tended to break and crumble when the two bundle werebeing made. Further, when the abrader was turned on, the remaining shavings tended to breakand fall out of the bundles more frequently than steel shavings. However, in Test 20 one shavingstayed in the bundle for the full four hours of the test.Damage caused by the shaving was mainly limited to the topcoat with some superficialdamage to the Poly X layer (Figure 44). If the test was allowed to run longer it is possible thatthe shaving may have eventually abraded through to the conductor. However, in general whenan aluminum shaving got into a position where it was forced into the insulation, it tended tobreak and was no longer an abrasion threat.Electrical Arcing of Aged Aircraft Wire.Lectromechanical Design CompanyReport No. N191-RPT4AU99 August 12, 199950
Figure 44. Test 20: Damage done in longitudinal abrasion tests with aluminum 7075shavingsElectrical Arcing of Aged Aircraft Wire.Lectromechanical Design CompanyReport No. N191-RPT4AU99 August 12, 199951
Page 3 and 4:
Electrical Arcing of Aged Aircraft
Page 5 and 6: were placed between wires in small
Page 7 and 8: BackgroundArc tracking of aircraft
Page 9 and 10: EXPERIMENTAL PROCEDURESWet Arc Trac
Page 11 and 12: Figure 5. Circuit used in the metal
Page 13 and 14: Figure 8. Apparatus used for metal
Page 15 and 16: DESCRIPTION OF ELECTRICAL ACTIVITYT
Page 17 and 18: The voltage and current waveforms w
Page 19 and 20: Figure 15. Example of a strong arci
Page 21 and 22: RESULTSTable 1 lists the Test run g
Page 23 and 24: Table 3. Summary of Metal Shavings
Page 25 and 26: APPENDIX A: Description of Individu
Page 27 and 28: Test 1 & 2Wet Arc TrackingBundle: S
Page 29 and 30: Figure 22. Test 1: Oscillogram show
Page 31 and 32: Test 3Wet Arc TrackingBundle: Seven
Page 33 and 34: Figure 26. Test 3: Sample bundle af
Page 35 and 36: Figure 27. Test 4: Strong arcing on
Page 37 and 38: Test 6 & 7Wet Arc TrackingBundle: S
Page 39 and 40: Figure 32. Test 6: Sample bundle af
Page 41 and 42: Test 9:Bundle: Seven wires (6 over
Page 49 and 50: Figure 37. Test 14: Electrical powe
Page 51 and 52: Metal Shavings AbrasionTest 16 A &
Page 53 and 54: Test 17 & 192 Bundles: four wires e
Page 55: Figure 42. Test 17: Damage to wire
Page 59 and 60: Table 7. Description of alternate a
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Electrical Short Circuit/Arcing of Aged Aircraft Wiring

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