Cable Insulation Resistance Measurements Made During Cable Fire Tests

Contents

ABSTRACT... iii
ACKNOWLEDGMENTS... x
ACRONYMS AND INITIALISMS... xi
1. INTRODUCTION ... 1
1.1 Background ... 1
1.2 Report Structure ... 2
2. INSULATION RESISTANCE MEASUREMENT TECHNIQUES ................................................................... 3
2.1 Overview... 3
2.2 Insulation Resistance Measurement Techniques ......................................................................................... 3
3. THE SANDIA NATIONAL LABORATORIES INSULATION RESISTANCE MEASUREMENT
SYSTEM... 9
3.1 Concept ... 9
3.2 Design ... 12
3.2.1 Power Input Panel... 13
3.2.2 Switching Relay Panels... 13
3.2.3 Voltmeters... 13
3.2.4 Relay Controller... 13
3.2.5 Computer ... 14
3.2.6 Interface Patch Panel... 14
3.2.7 Wiring Harness ... 14
3.2.8 Insulation Resistance Cable Bundle............................................................................................ 14
3.3 An Unplanned System Anomaly ... 14
3.4 Operation... 17
4. CABLE FIRE TESTS ... 20
4.1 Description ... 20
4.2 Test Matrix... 23
4.3 IR Measurement Interfaces... 28
5. INSULATION RESISTANCE MEASUREMENT RESULTS ......................................................................... 30
5.1 Tests 1 through 3... 30
5.1.1 Test 1 ... 30
5.1.2 Test 2 ... 33
5.1.3 Test 3 ... 36
5.2 Tests 4 through 8... 39
5.2.1 Test 4 ... 39
5.2.2 Test 5 ... 42
5.2.3 Test 6 ... 46
5.2.4 Test 7 ... 49
5.2.5 Test 8 ... 51
5.3 Tests 9 through 12... 57
5.3.1 Test 9 ... 57
5.3.2 Test 10 ... 59
5.3.3 Test 11 ... 61
5.3.4 Test 12 ... 63
5.4 Tests 13 through 18... 66
5.4.1 Test 13 ... 67
5.4.2 Test 14 ... 69
5.4.3 Test 15 ... 70
5.4.4 Test 16 ... 73
5.4.5 Test 17 ... 75
5.4.6 Test 18 ... 78
6. CURRENT LOOP DATA AND RESULTS... 81
6.1 Test Data and Results... 81
6.1.1 Test 13 ... 81
6.1.2 Test 14 ... 82
6.1.3 Test 15 ... 82
6.1.4 Test 16 ... 84
6.1.5 Test 17 ... 84
6.1.6 Test 18 ... 85
6.2 Observations... 85
7. CONCLUSIONS... 87
7.1 Insulation Resistance-Based Cable Failure Mode Results......................................................................... 87
7.2 Insulation Resistance Measurement Results Compared to SNL Influence Factors ................................... 89
7.2.1 Cable Physical Properties and Configuration Factors ................................................................. 90
7.2.2 Routing Factors... 92
7.2.3 Fire Exposure Condition Factors ................................................................................................ 93
8. REFERENCES... 94




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