1、DLIssue Date: February 14, 2005Implementation Date: June 1,2005ICS 27.100P62Record No. J4292005Electric Power Industry Standard of the Peoples Republic of ChinaPDL/T 5217 2005Technical Code for Design of220 kV-500 kV Compact OverheadTransmission LineIssued by the National Development and Reform Comm

2、ission of the People's Republic of ChinaElectric Power Industry Standard of the Peoples Republic of ChinaPDL/T 5217 2005Technical Code for Design of220 kV-500 kV Compact OverheadTransmission LineCHINA ELECTRIC POWER PRESSBEIJING, 2012圖書在版編目（CIP）數(shù)據(jù)DL/T 52172005 220kV500kV緊湊型架空送電線路設(shè)計技 術(shù)規(guī)定=Technica

3、l Code for Design of 220 kV500 kV Compact Overhead Transmission Line:英文/中華人民共和國國家發(fā)展和改 革委員會發(fā)布.一北京：中國電力出版社，2012.3ISBN 978-7-5123-2766-5I.DII.中III.架空線路：輸電線路-設(shè)計規(guī) 范一中國-英文IV.TM726.3-65中國版本圖書館CIP數(shù)據(jù)核字（2012）第036801號中國電力出版社出版、發(fā)行（北京市東城區(qū)北京站西街 19 號 100005 ）北京博圖彩色印刷有限公司印刷各地新華書店經(jīng)售*2012年 月第一版 2012年 月北京第一次印刷850毫米X11

4、68毫米 32開本 1.125印張 25千字印數(shù)0001-0000冊定價0.00元敬告讀者本書封面貼有防偽標(biāo)簽，刮開涂層可查詢真?zhèn)伪緯缬杏⊙b質(zhì)量問題，我社發(fā)行部負(fù)責(zé)退換版權(quán)專有翻印必究DL/T 5217 2005ForewordAs compared with the conventional overhead power transmission lines, compact overhead power transmission lines can considerably increase the natural power transmission, effectively redu

5、ce the size of line corridors, increase the power transmission capacity per unit of line corridors, thus contributing greatly to significant economic and social benefits.This code is established in order to summarize the experiences in respect of scientific research, design, construction and operati

6、on of compact overhead power transmission lines in China, drive and guide the adoption of this new technology in construction of power grids in China. As a supplement to DL/T 50921999 Technical Code for Designing 110 kV-500 kV Overhead Transmission Line, it specifies the main technical design requir

7、ements for 220 kV-500 kV AC compact overhead transmission lines.Appendix A and B to this code are normative.This code is proposed by China Electricity Council.This code is solely managed and interpreted by Technical Committee on Electric Power Planning and Engineering of Standardization Administrati

8、on of Power Industry.The code is drafted by North China Power Engineering Co., Ltd of China Power Engineering Consulting Group.The leading authors of this code are Gu You, Fu Chunheng, Liu Guang, Wan Xinliang, Ma Zhijian, Nie Tianming, Cao Yujie, Qin Qingzhi, Wang Yuanpeng, Zhang Yuemin, Jiang Yi an

9、d Wang Lei.This code is translated by SUNTHER Translation & Solutions under the authority of China Electric Power Planning & Engineering Association.DL/T 5217 2005ContentsForeword II1 Scope12 Normative References23 General34 Terms and Symbols45 Routing76 Meteorological Conditions87 Conductor

10、 and Shield Wire98 Insulator and Fittings149 Insulation Coordination, Lightning Protection and Grounding.1710 Conductor Configuration2211 Towers2412 Clearance to Ground and Obstacles25Appendix A (Normative) Typical Meteorological Areas27Appendix B (Normative) Pollution Classification Standard of Hig

11、hVoltage Overhead Transmission Line - - 281 Scope1.0.1 This code specifies the main design and technical requirements for 220 kV-500 kV AC compact overhead transmission lines.1.0.2 This code is applicable to the design of 220 kV-500 kV compact overhead transmission lines (hereinafter referred to as

12、compact lines). 1.0.3 This code is not applicable to the design of compact lines in heavy icing areas and those with a large span.DL/T 5217 20052 Normative ReferencesThe following normative documents contain provisions which, through reference in this text, constitute the provisions of this code. Fo

13、r dated references, subsequent amendments (excluding the contents of errata) to, or revision o( any of these publications do not apply. However, parties to agreements based on this code are encouraged to investigate the possibility of applying the most recent editions of the normative documents indi

14、cated below. For undated references, the latest edition of the normative document referred to applies.DL/T 50921999 Technical Code for Designing 110 kV-500 kV Overhead Transmission LineDL/T 51542002 Technical Regulation of Design for Tower and Pole Structures of Overhead Transmission Line293 General

15、3.0.1 The construction of compact line shall be demonstrated in terms of the necessity, economic benefits and social benefits from the perspective of increase of the transmission capacity of power grids and save of line corridors.3.0.2 The design of compact lines must be in compliance with the natio

16、nal basic construction strategy and economic policies and be safe, reliable, economic and reasonable.3.0.3 This code is based on DL/T 5092 1999 and makes supplementary provisions on the technical design of compact lines. For the basic rules governing loads, materials, structural design, structure an

17、d foundation of towers, refer to DL/T 5092一1999.3.0.4 In addition to the requirements stipulated in this code, relevant provisions specified in the current national standards and electric power industry standards shall also be complied with in the design of compact lines.4 Terms and Symbols4.1 Terms

18、The following terms and symbols are applicable to this part.4.1.1Compact overhead transmission lineOverhead transmission line for which grounding members between three-phase conductors have been eliminated through optimization of conductor configuration in order to improve the inherent transmission

19、power, reduce the width of corridor and increase the transmission capacity per unit of the corridor.4.1.2Spacer between phasesInsulated spacer supporting two phases of conductors to control the clearance between them.4.1.3Heavy ice areaAreas with design ice thickness of 20 mm or above.4.1.4Everyday

20、tensionThe tension at the lowest point of sag of conductor or shield wire which is calculated under the annual average temperature.4.1.5Tension sectionLine part between two tension towers.4.1.6Electrical clearanceMinimum clearance between any live part of a line and grounding parts.4.1.7Ground clear

21、anceMinimum clearance between any live part of a line and the ground.4.1.8Residential areaPopulated areas like industrial area, port, wharf, rail station and towns.4.1.9Nonresidential areaAreas other than residential area defined above. Nonresidential areas also include the areas with frequent prese

22、nce of people, vehicles or agricultural mechanics but no or few houses.4.2 SymbolsThe following symbols are used in this code:Haltitude, km;Ksafety coefficient of mechanical strength of insulators;Kcsafety coefficient of conductor or shield wire;Lspan, m;nquantity of insulators at areas with the alt

23、itude below1000 m, piece;quantity of insulators at areas with high altitude, piece;Sclearance between conductor and shield wire, m;Tmaxmaximum tension at the lowest point of sag of conductor or shield wire, N;7ptensile of conductor or shield wire, N;7rultimate design load of insulators, kN;Tmaximum

24、working load, line breakage load, string breakage load or annual continuous load of insulators, kN.5 Routing5.0.1 The routing of compact line shall be made taking into account comprehensively such factors as construction, operation, traffic condition and length of the line and no less than two optio

25、ns shall be compared in terms of technical and economical indices to ensure safety, reliability and cost effectiveness.5.0.2 Two circuits of compact lines passing through constrained areas should share the same tower provided that both the operating safety and reliability are fully ensured.5.0.3 The

26、 length of a tension section of compact line should not be larger than 20 km and may be increased appropriately if both the construction and operating conditions permit. In hilly areas or areas with undesirable operating conditions, the length may be reduced appropriately.5.0.4 The routing of compac

27、t line shall be made such that, to the maximum extent possible:1 The line will not exhibit large span, large height difference and excessively large span difference between neighboring spans;2 The line will not pass through the areas susceptible to ice coating;3 The line will not pass through the ar

28、eas where conductors are susceptible to gallop;4 The line should run along leeward slope where it passes through mountainous areas.6 Meteorological Conditions6.0.1 The meteorological conditions for design shall be determined according to the following recurrence periods based on the meteorological i

29、nformation for the routing areas and the operating experiences obtained from the existing lines nearby:500 kV compact line30 years220 kV-330 kV compact line15 yearsIf the meteorological conditions along the route are similar to the typical conditions as mentioned in Table A.l, Appendix A, the data f

30、or typical meteorological conditions should be used.6.0.2 The 10-minutes annual maximum wind speed from the local meteorological observatory shall be used as the sample to determine the maximum design wind speed, and, the extreme-value type I distribution should be used as the probability model.The

31、elevations for wind speed statistics are as follows:500 kV compact lineDistance from the ground: 20 m220 kV-330 kV compact line Distance from the ground: 15 m6.0.3 The maximum design wind speed for transmission lines shall be selected based on the statistic value of the maximum wind speed. For trans

32、mission line in mountainous area, it shall be 10% higher than the statistic value for nearby plain areas if reliable material is unavailable.The maximum design wind speed for 220 kV-330 kV compact lines shall not be lower than 25 m/s and that for calculating tension and load of conductor and shield

33、wire as well as tower load of 500 kV compact lines shall not be lower than 30 m/s.6.0.4 In icing areas, check shall be done based on the rare icing condition if necessary.7 Conductor and Shield Wire7.0.1 Compact lines shall employ conductor bundles whose cross- sectional area shall not only be selec

34、ted based on economic current density, but also be checked against the corona and radio interference conditions, and, where necessary, shall be checked in terms of audible noises. To increase the natural power transmission, the cross-sectional area of a conductor bundle and the number of the bundles

35、 shall be determined through technical and economic comparison.7.0.2 The conductor shall be selected such that the electric charges on each sub-conductor are basically in equilibrium. The maximum and minimum electric charges non-uniformity coefficient of sub-conductors should not be larger than 1.05

36、 or less than 0.95. The working capacitance of phase conductors should not differ by more than 0.25%. 7.0.3 The allowable temperatures of conductors for verifying the allowable current-carrying capacity are as follows: +80°C for steel- reinforced aluminum stranded conductors and steel-reinforce

37、d aluminum alloy stranded conductors; +80 °C or a temperature determined based on the experiences for steel-reinforced aluminum cladded stranded steel conductors (including aluminum clad stranded steel conductors); +125 °C for stranded galvanized steel conductor. The ambient temperature sh

38、all be the maximum average temperature in the hottest month; the wind speed shall be 0.5 m/s; the sun radiation power density shall be 0.1 W/cm2.7.0.4 Compact lines shall employ conductor bundles and the subconductors should be arranged symmetrically and uniformly. In order to control subspan oscill

39、ation of conductor bundles, the ratio between the bundle spacing and the diameter of the sub-conductor should belarger than 15.Number of sub-conductors per phase:500 kV compact lineshould not belessthan 6330 kV compact lineshould not belessthan 4220 kV compact lineshould not belessthan 37.0.5 The de

40、sign safety coefficient of conductor and shield wire shall not be less than 2.5. The design safety coefficient of shield wire should be larger than that of conductor.The maximum tension at the lowest point of sag of conductor or shield wire shall be calculated according to Equation 7.0.5:(7.0.5)KcWh

41、ere:Tmaxmaximum tension at the lowest point of sag of conductor or shield wire, N;7ptensile capacity of conductor or shield wire, N;Kc一safety coefficient of conductor or shield wire.The tension at the attachment point of conductor or shield wire may be increased by 10% as compared with the maximum t

42、ension at the lowest point.For the conductor and shield wire erected on pulley, the additional tension due to local bending at attachment points shall be calculated as well.Under the meteorological condition with rare wind speed or rare ice thickness, the maximum tension at lowest point of sag shall

43、 not exceed 60% of the breakage tensile and that at the attachment points shall not exceed 66% of the breakage tensile.7.0.6 The shield wire shall meet both mechanical and electrical operating condition requirements and stranded galvanized steelconductor or composite stranded conductor may be used.

44、Alternatively, optical fiber composite overhead ground wire (OPGW) may be used depending upon the communication requirement. The allowable temperatures of shield wire for verifying short-circuit thermal stability are as follows: +200 °C for steel-reinforced aluminum conductor (ACSR) and aluminu

45、m-alloy conductor steel-reinforced (AACSR); +300 °C for steel-reinforced aluminum-clad steel stranded conductor (including aluminum-clad steel stranded conductor); +400 °C for stranded galvanized steel conductor; and guaranteed test value for OPGW. The calculation time and corresponding sh

46、ort-circuit current value shall be determined according to the specific system conditions. Where shield wire employs stranded galvanized steel wire, it shall has a nominal cross-sectional area of not less than 80 mm2 for 500 kV compact lines and not less than 50 mm2 for 220 kV and 330 kV compact lin

47、es. 7.0.7 Anti-vibration Measures for Conductor and Shield WireFor aluminum conductor steel-reinforced or stranded galvanized steel conductor with a section ratio between aluminum and steel not less than 4.29, the upper limits of everyday tension and the corresponding anti-vibration measures shall c

48、onform to the requirements of Table 7.0.7. However, the restriction therein may be ignored if supported by years of operating experiences.Table 7.0.7 Upper Limits of Everyday Tensions of Conductor and Shield Wire and Anti-Vibration MeasuresScenarioAnti-vibrationMeasuresUpper Limits of Everyday Tensi

49、on (percentage of tensile capacity, %)Steel-coreAluminumConductorStrandedGalvanized SteelConductorOpen area where a span does not exceed 500 mNot Required1612Table 7.0.7 (continued)ScenarioAnti-vibrationMeasuresUpper Limits of Everyday Tension (percentage of tensile capacity, %)Steel-coreAluminumCon

50、ductorStrandedGalvanized SteelConductorAreas rather than open area where a span does not exceed 500 mNot Required1818A span does not exceed 120 mNot Required1818Whatever the span isArmour rods22Whatever the span isVibration damper (damping wire) or armour rods2525Where it is necessary to employ damp

51、ing spacers for quad-bundle conductors and above, the damping spacers should be arranged at unequally spaced intervals and asymmetrically. In cases where the conductor span is 500 m and below, other anti-vibration measures may be eliminated. The largest sub-span of conductors should not be excessive

52、ly large and should be controlled within about 70 m. The sub-span of conductors at both ends should be controlled within 30 m-35 m.7.0.8 The creep of conductor and shield wire after erection shall be determined based on the data provided by manufacturer or by tests. In case no such information is av

53、ailable, 1 x 10-4 may be taken for stranded galvanized steel wire, and the values listed in Table 7.0.8-1 may be used for ACSR.Table 7.0.8-1 Creep for ACSRSection Ratio between Aluminum and SteelCreep7.71-7.914x10_4-5x10-45.05-6.163x10-4x104.29-4.383XKT4Temperature decrement method should be used to

54、 offset the impact of creep on sag. A decrement of 10°C may be used for stranded galvanized steel wire and the data contained in Table 7.0.8-2 may be used for ACSR if the above creep values are used.Table 7.0.8-2 Temperature Decrement of ACSRSection Ratio between Aluminum and SteelTemperature D

55、ecrement°C7.71-7.9120-255.05-6.1615-204.29-4.38158 Insulator and Fittings8.0.1 The safety coefficient of mechanical strength of insulators shall not be less than the values as listed in Table 8.0.1-1 and Table 8.0.1-2. In case of double insulator strings and multiple insulator strings, the post

56、-string breakage mechanical strength thereof shall be checked and the load and safety coefficient thereof shall be designed based on the string breakage scenario.Table 8.0.1 -1 Safety Coefficients of Mechanical Strength of Cap and Pin InsulatorsScenarioMaximum Working LoadLine BreakageString Breakag

57、eSafety coefficient2.71.81.5Table 8.0.1 -2 Safety Coefficients of Mechanical Strength of Composite InsulatorsScenarioMaximum Working LoadLine BreakageString BreakageSafety coefficient3.01.81.5The safety coefficient of cap and pin insulators shall not be lower than 4.0 under normal operating conditio

58、n with continuous load.The safety coefficient K of the mechanical strength of insulators shall be calculated according to Equation 8.0.1:(8.0.1)Where:Trultimate design load of insulators, kN;T maximum working load, line breakage load, string breakage load or continuous load of insulators respectively, kN.The continuous load refer