DL/T5221-2005城市电力电缆线路设计技术规定 英文【2025|PDF下载-Epub版本|mobi电子书|kindle百度云盘下载】

DL/T5221-2005城市电力电缆线路设计技术规定 英文PDF格式电子书版下载

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1 Scope1

2 Normative References2

3 Terms and Definition3

4 General Provisions6

5 Cable Route7

6 Cable Laying Modes10

6.1 General Requirements10

6.2 Direct Burying12

6.3 Cable Duct Laying13

6.4 Tunnel Laying16

6.5 Cable Trough Laying17

6.6 Bridge Laying17

6.7 Underwater Laying19

6.8 Vertical Laying20

6.9 Cable Connecting Poles(towers)21

6.10 Cable Termination Stations22

7 Selection of Cable Configuration23

7.1 General Provisions23

7.2 Selection of Insulation Shield,Metallic Sheaths,Armors and Oversheaths24

7.3 Cable Conductors25

8 Selection of Cable Accessories28

8.1 General Provisions28

8.2 Types of Cable Terminations and Joints29

8.3 Construction of Cable Terminations and Joints30

8.4 Cable Termination Supports33

8.5 Overvoltage Protection35

9 Design of Oil Supply System of Self-contained Oil-filled Cable37

10 Grounding Modes of Metallic Sheath or Shield Layer40

11 Selection of Cable Supports and Clamps44

12 Process Design of Cable Tunnel46

12.1 General Requirements46

12.2 Cable Tunnel Interfaces47

12.3 Auxiliary Facilities in Cable Tunnel48

13 Fire Fighting Design of Cables51

13.1 Selection of Flame Retardant Cables51

13.2 Fire Fighting Design of the Cable Raceway and Cable Mezzanine of Substation51

13.3 Fire Protection Design of Cable Tunnel,Cable Trench and Cable Shaft52

Appendix A(Normative) Explanation of Wording in this Rule55

Appendix B(Normative) Calculation of the pulling force and the lateral pressure56

Appendix C(Informative) Calculation of length of the cable duct manhole61

C.1 Calculation of the length of the cable duct manhole61

Appendix D(Informative) Lateral displacement,thermal expansion,and axial force of snaking arc64

D.1 Calculation of the lateral displacement of the snaking arc64

D.2 Calculation formula of thermal expansion64

D.3 Calculation formula of the axial force of the snaking arc66

D.4 Calculation of the number and installation positions ofclamps needed for vertical laying of cables67

Appendix E(Informative) Chemical stability of the plastic sheath72

Appendix F(Normative) Correction Factors of Permissible Continuous Ampacity of Cables under Different Laying Conditions74

Appendix G(Informative) Average Ground Temperature of Representative Cities of Various Regions around the Country in August77

Appendix H(Normative) Calculation of the Oil Demand and Transient Oil Pressure of Oil-filled Cables80

H.1 Calculation of the oil demand ofoil-filled cables80

H.2 Calculation of transient oil pressure82