DL/T5221-2005城市电力电缆线路设计技术规定 英文pdf电子书版本下载

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1 Scope 1

2 Normative References 2

3 Terms and Definition 3

4 General Provisions 6

5 Cable Route 7

6 Cable Laying Modes 10

6.1 General Requirements 10

6.2 Direct Burying 12

6.3 Cable Duct Laying 13

6.4 Tunnel Laying 16

6.5 Cable Trough Laying 17

6.6 Bridge Laying 17

6.7 Underwater Laying 19

6.8 Vertical Laying 20

6.9 Cable Connecting Poles(towers) 21

6.10 Cable Termination Stations 22

7 Selection of Cable Configuration 23

7.1 General Provisions 23

7.2 Selection of Insulation Shield,Metallic Sheaths,Armors and Oversheaths 24

7.3 Cable Conductors 25

8 Selection of Cable Accessories 28

8.1 General Provisions 28

8.2 Types of Cable Terminations and Joints 29

8.3 Construction of Cable Terminations and Joints 30

8.4 Cable Termination Supports 33

8.5 Overvoltage Protection 35

9 Design of Oil Supply System of Self-contained Oil-filled Cable 37

10 Grounding Modes of Metallic Sheath or Shield Layer 40

11 Selection of Cable Supports and Clamps 44

12 Process Design of Cable Tunnel 46

12.1 General Requirements 46

12.2 Cable Tunnel Interfaces 47

12.3 Auxiliary Facilities in Cable Tunnel 48

13 Fire Fighting Design of Cables 51

13.1 Selection of Flame Retardant Cables 51

13.2 Fire Fighting Design of the Cable Raceway and Cable Mezzanine of Substation 51

13.3 Fire Protection Design of Cable Tunnel,Cable Trench and Cable Shaft 52

Appendix A(Normative) Explanation of Wording in this Rule 55

Appendix B(Normative) Calculation of the pulling force and the lateral pressure 56

Appendix C(Informative) Calculation of length of the cable duct manhole 61

C.1 Calculation of the length of the cable duct manhole 61

Appendix D(Informative) Lateral displacement,thermal expansion,and axial force of snaking arc 64

D.1 Calculation of the lateral displacement of the snaking arc 64

D.2 Calculation formula of thermal expansion 64

D.3 Calculation formula of the axial force of the snaking arc 66

D.4 Calculation of the number and installation positions ofclamps needed for vertical laying of cables 67

Appendix E(Informative) Chemical stability of the plastic sheath 72

Appendix F(Normative) Correction Factors of Permissible Continuous Ampacity of Cables under Different Laying Conditions 74

Appendix G(Informative) Average Ground Temperature of Representative Cities of Various Regions around the Country in August 77

Appendix H(Normative) Calculation of the Oil Demand and Transient Oil Pressure of Oil-filled Cables 80

H.1 Calculation of the oil demand ofoil-filled cables 80

H.2 Calculation of transient oil pressure 82