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Summary of Fuse Testing for Barrel Module Fuse Boxes
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Summary of Fuse Testing for Barrel Module Fuse Boxes Duke University Jack Fowler
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Summary of Fuse Testing for Barrel Module Fuse Boxes. Duke University Jack Fowler. Fuse Box Production Summary. Fuse Boxes have been in production for ~ 12 months 35 sets of each type are being produced This involves > 7500 fuses Fuses were delivered from Oct 03 until Aug 04. - PowerPoint PPT Presentation
Transcript of Summary of Fuse Testing for Barrel Module Fuse Boxes
Summary of Fuse Testing for Barrel Module Fuse Boxes
Duke University
Jack Fowler
Fuse Box Production Summary
• Fuse Boxes have been in production for ~ 12 months
• 35 sets of each type are being produced
• This involves > 7500 fuses
• Fuses were delivered from Oct 03 until Aug 04
Fuse Box Production Steps
• Assemble Fuse Box components and solder• Test Fuse Resistance• Clean Fuse boxes and dry• Test Fuse Resistance• Dry fuse boxes for minimum 3 hrs at < 55° C• Conformal coat fuse box components• Final Test Boxes - continuity at < 100 V and check
for breakdown at 2 kV• Final assembly – add hardware and heat shrink and
label cables
Fuse Boxes
Post Production Tests
• Once fuse boxes are through the final test, we perform simple resistance test on each of the fuses.
• In the period of time between tests, the fuse boxes are stored on a shelf in the lab.
Failed Resistance Test Post Production
100
13 13 136 6 4
9
164
0
20
40
60
80
100
120
140
160
180
17-Nov-04 23-Nov-04 28-Nov-04 7-Dec-04 16-Dec-04 22-Dec-04 30-Dec-04 6-J an-05 Total FuseTests
Fuse Recovery
• The recovery was performed by applying ~ 600 V through a 6 MΩ resistor to all of the fuses. This applied ~ 100 µA current. This was applied for 1 minute.
• The fuse resistance was tested and the results recorded.
Fuse Recovery
100
13 13 136 6 4
9
164
43
11 12 95 6 4
9
99
0
20
40
60
80
100
120
140
160
180
17-Nov-04 23-Nov-04 28-Nov-04 7-Dec-04 16-Dec-04 22-Dec-04 30-Dec-04 6-J an-05 Total FuseTests
Failed Resistance Test Post Production
Recovered 12-Jan-05
Fuse Conditioning after Recovery
• After recovery, all of the fuse boxes were connected in parallel and a 100 µA current was applied.
• The fuse boxes were left in this condition.
• After 2 weeks, half of the boxes were removed and the fuse resistance was tested. This included ~3500 fuses.
Fuse Box Conditioning
Fuse Box Connections
Fuse Tests after Two weeks of Conditioning
19
63
6
2 3 3 4
42
8
1 1 1 02 1 0
14
1 1 0 1 0 0 0 03
8
0
5
10
15
20
25
30
35
40
45
17-Nov-04 23-Nov-04 28-Nov-04 7-Dec-04 16-Dec-04 22-Dec-04 30-Dec-04 6-J an-05 Total FuseTests
# of Recovered Fuses tested after two week trainingRecovered Fuses failed after two week training 1-Feb-05Recovered Fuses failed after two week training 6-Feb-05**Additional Fuses Failed during two week conditioning**
Summary
• Before recovery and conditioning, fuse failures seemed to be stabilizing at ~ 0.1 % per week.
• Recovery was successful for 60 % of previously failed fuses.
• After 2 weeks of conditioning, 33 % of “recovered” fuses failed.
• During 2 weeks of conditioning, an additional 8 fuses failed. This equates to ~ 0.1%/week.
• An additional 3 of the “recovered” fuses failed 1 week later bringing the failure rate to 40 %. No new fuses failed.
Future Plans
• Continue conditioning for the remaining half of the fuse boxes for 2 more weeks.
• Continue testing post conditioned fuses weekly for additional failures.
• Continue new design of fuse box without fuses. Resistors will take the place of the fuses.
