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GB 50545-2010 PDF in English

GB 50545-2010 (GB50545-2010) PDF English
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GB 50545-2010: PDF in English

P GB 50545-2010
Code for Design of 110kV~750kV Overhead
Transmission Line
Jointly issued by. Ministry of Housing and Urban-rural Development;
General Administration of Quality Supervision, Inspection
and Quarantine of the People's Republic of China.
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
11 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.
2 Terms and Symbols
2.1 Terms
2.1.1 Overhead transmission line
It refers to the power line in which the insulator and tower are used to set the conductor
above the ground.
2.1.2 Telecommunication line
It refers to the communication line of various electrical signals.
2.1.3 Large crossing
It refers to the section that the conductor selection or tower design needs special
consideration owing to larger span (above 1000m) or higher tower (above 100m) when line
crossing navigation river, lake or strait and has a strong impact on navigation or especially
difficult repair during fault.
2.1.4 Light/medium/heavy icing area
The area with design ice coating thickness equal to 10mm and below is light icing area;
the area with design ice coating thickness larger than 10mm and less than 20mm is medium
icing area; the area with design ice coating thickness equal to 20mm and above is heavy icing
2.1.5 Reference wind speed
βc——the adjustment coefficient of wind load of conductor and earthwire;
βz——the adjustment coefficient of wind load of tower;
μs——the shape coefficient of member;
μsc——the shape coefficient of conductor or earthwire;
μz——the altitude variation coefficient of wind pressure;
ψ——the combination coefficient of variable load;
ψWE——the combination coefficient of wind load in seismic fundamental combination
γo——the significance coefficient of tower structure;
γEh——the partial coefficient of horizontal seismic action;
γEV——the partial coefficient of vertical seismic action;
γEQ——the partial coefficient of colligation of variable load of conductor and earthwire
γG——the partial coefficient of the permanent load;
γQi——the partial coefficient of i
th variable load;
γrf——the adjustment coefficient of foundation bearing capacity;
γRE——the seismic adjustment factor of bearing force;
γf——the additional partial coefficient of foundation
2.2.4 Geometric parameters
AI——the calculated value of area of insulator string bearing wind pressure;
AS——the calculated value of projected area of member bearing wind pressure;
D——the horizontal spacing of conductors;
Dp——the horizontal projection distance between conductors;
Dx——the equivalent horizontal spacing of cam arrangement of conductor;
Dz——the vertical projection distance between conductors;
d——the external diameter of conductor or earthwire or calculated external diameter of
ice coating; the divided conductor shall be adopted with the sum of external diameter of all
fc——the maximum sag of conductor;
H——the absolute altitude;
L——the span
Lk——the length of link suspension insulator;
Lo1——the geometrical creepage distance of single suspension insulator;
Lp——the horizontal span of tower;
S——the distance between conductor and earthwire;
θ——the included angle between wind direction and conductor or earthwire direction;
γk——the standard value of geometric parameter
3 Routing
3.0.1 The routing should be adopted with new technology as satellite photo, aerial photo,
digital photogrammetry system and infrared measurement; if necessary, the geologic remote
sensing technology should be adopted in complex geologic condition region; such factors as
line length, topography and landform, geology, icing area, communication, construction,
operation and local planning shall be comprehensively considered; the technical economical
comparison of multiple schemes shall be carried out to achieve safety and reliability, friendly
environment and economy and rationality.
3.0.2 The routing shall keep clear of military installation, large industrial and mining
enterprises and critical facilities and shall meet the urban planning.
3.0.3 The routing should keep clear of poor geologic area and mining affected area; if it is...
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.