Underground Power Cable HANDBOOK

Table of Contents
Introduction 1
Chapter 1 1
1.1 Introduction 1
1.2 Objective 1
1.3 General Requirements
1.4 Principle Specifications 5
1.5 Existing Requirement for Electricite′ du Cambodge (EDC), Cambodia 10
1.6 Existing Requirement for Electricite′ du Laos (EDL), Lao People's Democratic Republic 11
1.7 Existing Requirement for Ho Chi Minh City Power Corporation (HCMCPC), Vietnam. 11
1.8 Existing Requirement for Hanoi Power Corporation (HNPC) Vietnam 13
1.9 Additional Requirement for Metropolitan Electricity Authority (MEA), Thailand 14
1.10 Conclusion 16
Chapter 2 17
2.1 Introduction 17
2.2 Objective 17
2.3 Documents required for evaluation 17
2.4 Guideline for bid evaluation 22
2.5 Conclusion 24
Chapter 3 25
3.1 Introduction 25
3.2 Objective 25
3.3 Inspection Committee Management 25
3.4 Manufacturing Process Inspection 26
3.5 Factory acceptance tests 29
3.6 Conclusion 32
Chapter 4 34
4.1 Introduction 34
4.2 Objective 34
4.3 Acceptance Committee Management 34
4.4 Acceptance Process 35
4.5 Conclusion 39
Chapter 5 40
5.1 Introduction 40
5.2 Objective 40
5.3 Ampacity Calculation 40
5.4 Insulation and Sheath Thickness Calculation 55
5.5 Calculation on Cable Pulling Tension 58
5.6 Conclusion 71
Chapter 6 72
6.1 Introduction 72
6.2 Objective 72
6.3 Types of installation 72
6.4 Cable Laying Procedure 79
6.5 Installation Acceptance Process 88
6.6 Conclusion 89
Chapter 7 90
7.1 Introduction 90
7.2 Objective 90
7.3 Maintenance and Inspection 91
7.4 Field Tests on Cable 98
7.5 Cable Monitoring System 106
7.6 Conclusion 107
References 108
APPENDIX A : Specification of 8.7/15 kV & 12/20 kV XLPE COPPER CABLE A-1
APPENDIX B : Specification of 69 & 115 kV XLPE COPPER CABLE B-1
Figures
Figure 1 : Cross-section of 69 & 115 kV PE Outer Sheath (Jacket) 10
Figure 2 : Cross-section of 69 & 115 kV PE Outer Sheath (Jacket) 15
Figure 3 : Cross-section of 69 & 115 kV Fire Retardant PVC Outer Sheath (Jacket) 16
Figure 4 : Cable Drawing 21
Figure 5 : Schematic diagram of Extrusion Line 28
Figure 6 : The geometric factor (G) and the Screening Factor 50
Figure 7 : Mutual Heating Effect 52
Figure 8 : Direct Burial Installation 73
Figure 9 : Semi-Direct Burial Installation 74
Figure 10 : Concrete Trough Installation 74
Figure 11 : Concrete Encased Installation 75
Figure 12 : Concrete Trench 76
Figure 13 : Horizontal Directional Drilling Construction Layout Crossing the River 77
Figure 14 : Cross Section of Concrete Pipe ID 1 m 78
Figure 15 : Pulling Eye 80
Figure 16 : Pulling Grips 80
Figure 17 : Direct Burial Cable Laying Procedure 82
Figure 18 : Cable Laying for Direct Burial 82
Figure 19 : Cable Laying Procedure for Duct Installation 83
Figure 20 : Test Rod or Dummy 84
Figure 21 : CCTV Camera for Checking Duct 84
Figure 22 : Checking Duct by Using CCTV Camera 84
Figure 23 : Method of Cable Pulling 84
Figure 24 : Cable Laying Procedure for Tunnel Installation 86
Figure 25 : Floor Mounting Rollers 87
Figure 26 : Cable Installation in Tunnel by Caterpillar Method 87
Figure 27 : Megger Test1 kV 88
Figure 28 : Insulation Testing 88
Figure 29: Murray Loop Bridge Method 95
Figure 30: Cable Fault Waveform Reflections 96
Figure 31 : Tan δ Test Results (K. Brown IEEE ICC Minutes Spring 2005) 104
Tables
Table 1 : Major characteristics of underground cable 5
Table 2 : Nominal diameters of round armor wires 12
Table 3 : Nominal thickness of armor tapes 12
Table 4: Sample of Proposed Technical Data for High Voltage XLPE Copper Cable 20
Table 5 : Partial Discharge Test 30
Table 6: Voltage Test 30
Table 7 : Routine and Special Tests Report 37
Table 8 : Acceptance Tests Report 38
Table 9 : Conductor AC Resistance 43
Table 10 : Dielectric losses of insulation 43
Table 11 : Sheath Resistance of each material 44
Table 12 : Thermal Resistances of each material 49
Table 13 : Nominal Thickness of PVC/B Insulation for Cable Rated Voltages 55
Table 14 : Nominal Thickness of Cross-lined Polyethylene (XLPE) Insulation 55
for Cable Rated Voltages
Table 15 : Nominal Thickness of Ethylene Propylene Rubber (EPR) and Hard 56
Ethylene Propylene Rubber (EPR) Insulation for Cable Rated Voltages
from 6 kV (Um = 7.2 kV) to 30 kV (Um = 36 kV)
Table 16 : Maximum Cable Cross-sectional Area as a Percentage of Internal 58
Conduit or Duct Area (Refer to NEC)
Table 17 : Minimum Recommended Bending Radii for Unarmored Power Cables 60
for Cables Rated
Table 18 : Cable Configurations in Conduit 61
Table 19 : Recommended Basic Dynamic Coefficient of Friction, Straight Pulls 63
& Bearing Pressures
Table 20 : Recommended Maximum Pulling Tensions at Pulling Eyes 64
Table 21: Recommended Maximum Pulling Tensions Copper and Aluminum 65
Conductor Single
Table 22 : Definition of symbols 68
Table 23: Comparison of Different Methods of UG Cable Installation 79
Table 24: Value of Direct Voltage for Jacket Test 88
Table 25 : DC Test Voltage according to IEC 60502-2005 99
Table 26 : AC Test Voltage according to IEC 60840-2004 101
Table 27 : VLF Test Voltage according to IEEE 400.3-2006 102
Table 28: Summary of Different Tests 106
Table 29 : Methods for Monitoring Underground Cable System 107

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