DL/T 5221—2005城市电力电缆线路设计技术规定

Foreword

1 Scope

2 Normative References

3 Terms and Definitions

4 General Provisions

5 Cable Route

6 Cable Laying Modes

6.1 General Requirements

6.2 Direct Burying

6.3 Cable Duct Laying

6.4 TunneI Laying

6.5 Cable Trough Laying

6.6 Bridge Laying

6.7 Underwater Laying

6.8 Vertical Laying

6.9 Cable Connecting Poles (towers)

6.10 Cable Termination Stations

7 Selection of Cable Configuration

7.1 General Provisions

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

7.3 Cable Conductors

8 Selection of Cable Accessories

8. I General Provisions

8.2 Types of Cable Terminations and Joints

8.3 Construction of Cable Terminations and Joints

8.4 Cable Termination Supports

8.5 Overvoltage Protection

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

10 Grounding Modes of Metallic Sheath or Shield Layer

11 Selection of Cable Supports and Clamps

12 Process Design of Cable Tunne

12. I General Requirements

12.2 Cable Tunnel Interfaces

12.3 Auxiliary Facilities in Cable Tunne

13 Fire Fighting Design of Cables

13.1 Selection of Flame Retardant Cables

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

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

Appendix A (Normative) Explanation of Wording in this Rule

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

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

C. I Calculation of the length of the cable duct manhole

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

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

D.2 Calculation formula of thermal expansion

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

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

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This rule is prepared for the purpose of meeting the demands for design and construction of urban power cables and is intended to specify the main technical design requirement of urban power cables rated AC 220 kV and below in China.
　　Appendix A， Appendix B， Appendix F and Appendix H to this rule are normative.
　　Appendix C， Appendix D， Appendix E and Appendix G to this rule are informative.
　　This rule is proposed by China Electricity Council.
　　This rule is solely managed and interpreted by the Technical Committee on Electric Power Planning and Engineering of Standardization Administration of Power Industry.
　　Drafting Organization Shanghai Electric Power Design Institute Co.， Ltd.
　　Chief drafting staff: Gong Zun， Zhu Aijun， Li Guozheng， Shi Chuanqing and Zhou Dexin.
　　This rule is translated by SUNTHER Consulting Co.， Ltd. under the authority of China Electric Power Planning & Engineering Association.