1 General Provisions
1.0.1 In order to implement national capital construction policy and technical economy policy during the design of AC 110kV~750kV overhead transmission line, achieve safety and reliability, advanced application, economy and rationality, resource conservation and friendly environment, this code is formulated.
1.0.2 This code is applicable to the design of AC 110kV~750kV overhead transmission line; thereinto, AC 110kV~500kV is applicable to the design of single loop, same tower and double loop as well as same tower multiple loop transmission line; AC 750kV is applicable to the design of single loop transmission line.
1.0.3 The design of overhead transmission line shall start from practice, combine local characteristic, positively adopt new technique, new process, new equipment and new material, popularize and adopt advanced technology and product with energy conservation and consumption reduction as well as environmental protection.
1.0.4 As for important line and special section line, the proper strengthening measures should be adopted to improve security level of line.
1.0.5 This code specifies basic requirements of design of 110kV~750kV overhead transmission line; if this code interferes with specifications in national laws, administrative regulations, the national laws and administrative regulations shall be conformed to.
1.0.6 the design of overhead transmission line shall not only meet those specified in this code, but also comply with those specified in the national current relevant standards.
Contents
1 General Provisions 1
2 Terms and Symbols 1
2.1 Terms 1
2.2 Symbols 2
3 Routing 4
4 Meteorological Conditions 5
5 Conductor and Earthwire 7
6 Insulators and Fittings 10
7 Insulation Coordination, Lightning Protection and Grounding 11
8 Conductor Arrangement 16
9 Tower Type 17
10 Tower Load and Material 18
10.1 Tower Load 18
10.2 Structural Material 24
11 Tower Structure 26
11.1 General Calculating Stipulation 26
11.2 Ultimate State Expression for Carrying Capacity and Serviceability 27
11.3 General Stipulation for Structure 28
12 Foundations 29
13 Ground Clearance and Crossing 31
14 Environmental Protection 38
15 Labor Safety and Industrial Sanitation 38
16 Accessories 39
Appendix A Typical Meteorological Area 40
Appendix B Classification of Overhead Line Pollution 41
Appendix C Reference Value of m1 for Different Insulator Type 42
Appendix D Horizontal Distance between Phases Depending on Span for Suspension Tower 44
Appendix E Calculating Density and Cone Angle of Soil for Uplift Foundation 45
Appendix F Classification of Telecommunication Line 46
Appendix G Classification of Road 47
Explanation of Wording in this Code 48
List of Quoted Standards 49
