GB 50061-2010 English PDFUS$1829.00 · In stock
Delivery: <= 13 days. True-PDF full-copy in English will be manually translated and delivered via email. GB 50061-2010: Code for design of 66kV or under overhead electrical power transmission line Status: Valid GB 50061: Historical versions
Basic dataStandard ID: GB 50061-2010 (GB50061-2010)Description (Translated English): Code for design of 66kV or under overhead electrical power transmission line Sector / Industry: National Standard Classification of Chinese Standard: P62;F21 Classification of International Standard: 29.240.01 Word Count Estimation: 83,858 Date of Issue: 2010-01-18 Date of Implementation: 2010-07-01 Older Standard (superseded by this standard): GB 50061-1997 Quoted Standard: GB 50009; GB 50010; GB 50016; GB 50017 Regulation (derived from): Bulletin of the Ministry of Housing and Urban No. 492 Issuing agency(ies): Ministry of Housing and Urban-Rural Development of the People's Republic of China; General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Summary: This Chinese standard applies to 66kV and below overhead power lines design. GB 50061-2010: Code for design of 66kV or under overhead electrical power transmission line---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.1 General 1.0.1 This specification is formulated in order to make the design of 66kV and below overhead power lines safe and reliable, advanced in technology, economical and reasonable, convenient for construction and maintenance, and conducive to environmental protection and comprehensive utilization of resources. 1.0.2 This specification applies to the design of AC overhead power lines of 66kV and below (hereinafter referred to as overhead power lines). 1.0.3 The design of overhead power lines should conscientiously implement the country's technical and economic policies, meet the requirements of development planning, and actively adopt mature and reliable new technologies, new materials, new equipment, and new processes. 1.0.4 The tower structure design of overhead power lines shall adopt the limit state design method based on probability theory. 1.0.5 This specification stipulates the basic technical requirements for the design of overhead power lines of 66kV and below. When this specification conflicts with the provisions of national laws and administrative regulations, the provisions of national laws and administrative regulations shall be followed. 1.0.6 The design of overhead power lines shall not only comply with this specification, but also comply with the current relevant national standards. 2 terms2.0.1 power line It is a facility composed of wires, insulating materials and various accessories used for power transmission between two points in the power system. 2.0.2 overhead power line overhead power line A power line that uses insulators and towers to erect wires on the ground. 2.0.3 transmission line A line that is part of an electrical transmission system. 2.0.4 wire conductor A single wire or a twisted wire consisting of multiple wires that are not insulated from each other through which the current passes. 2.0.5 Ground wire overhead ground wire The wires grounded on some towers or all towers are usually suspended above the line wires to form a protection angle for the wires to prevent the wires from being struck by lightning. 2.0.6 Span The horizontal distance between the suspension points of two adjacent tower conductors. 2.0.7 Sag sag In an overhead line, the maximum vertical distance between the conductor and the line connecting the suspension point of the conductor. 2.0.8 creepage distance Under normal conditions, the shortest distance or the sum of the shortest distances between two parts along the surface of an insulator porcelain or glass insulator to which operating voltage is applied. 2.0.9 Mechanical failing load mechanical failing load Under the specified test conditions (the insulator string element should independently withstand the tensile load applied between the metal accessories), the maximum load that can be achieved by the insulator string element during the test. 2.0.10 pole and tower of an overhead line A device for suspending conductors through insulators. 2.0.11 Basic foundation A structure buried in the ground, connected to the bottom of the tower, and stably bearing the applied load.3 paths3.0.1 The selection of the overhead power line path should be carefully investigated and studied, comprehensively considering factors such as operation, construction, traffic conditions, and path length, overall planning, comprehensive arrangements, and multi-plan comparisons should be made to achieve economical rationality, safety and applicability. 3.0.2 The path of overhead power lines in urban areas should be combined with the overall urban planning, and the location of path corridors should be arranged uniformly with various pipelines and other municipal facilities. 3.0.3 The selection of overhead power line paths shall meet the following requirements. 1 Crossing with other facilities should be reduced; when crossing with other overhead lines, the crossing point should not be selected on the top of the tower of the crossed line. 2 Classification of overhead weak current lines shall comply with the provisions of Appendix A of this code. 3 The crossing angle of overhead power lines across overhead weak current lines shall meet the requirements in Table 3.0.3. 4 Overhead power lines from 3kV and above to 66kV and below should not cross the warehouse area where inflammable and explosive dangerous goods are stored. The fire distance between overhead power lines and Class A production workshops and warehouses, flammable and explosive material storage yards, and flammable or flammable and explosive liquid (gas) storage tanks shall comply with relevant national laws and regulations and the current national standard "Building Design Relevant provisions of GB 50016 Fire Code. 5 The shortest horizontal distance between Class A workshops and warehouses, stacks of flammable materials, Class A and B liquid storage tanks, liquefied petroleum gas storage tanks, flammable and combustion-supporting gas storage tanks and overhead power lines should not be less than the height of the pole (tower) 1.5 times; the shortest horizontal distance between the Class C liquid storage tank and the power overhead line should not be less than 1.2 times the height of the pole (tower). The nearest horizontal distance between the overhead power line above 35kV and the single tank of liquefied petroleum gas with a reserve of more than.200m3 shall not be less than 40m. 6 Overhead power lines should avoid depressions, scoured areas, unfavorable geological areas, virgin forest areas and other areas that affect the safe operation of lines. 3.0.4 The overhead power line should not pass through the forest area. When it is necessary to pass through the forest area, the line path should be selected according to the forest road and the specific conditions of the forest area, and the felling of trees should be minimized. The channel width of overhead power lines of 10kV and below should not be less than 2.5m extending outward on both sides of the line. The 35kV and 66kV overhead power lines should adopt a spanning design, and the cutting of trees should be strictly controlled in combination with electrical safety distances and other conditions in special areas. 3.0.5 When overhead power lines pass through fruit forests, commercial crop forests and urban green shrubs, it is not advisable to cut down the passages. 3.0.6 The length of the tensile section should meet the following requirements. 1 The length of the tension section of 35kV and 66kV overhead power lines should not be greater than 5km; 2 The length of the tension section of 10kV and below overhead power lines should not be greater than 2km. 3.0.7 35kV and 66kV overhead power lines should not pass through the core area and buffer zone of the nature reserve approved by the state.4 meteorological conditions4.0.1 The air temperature designed for overhead power lines should be determined according to the statistical values in the local meteorological records for 15 to 30 years. The highest temperature should be +40°C. Under the highest temperature condition, the lowest temperature condition and the annual average temperature condition, it should be calculated as no wind and no ice. 4.0.2 The annual average air temperature used in the design of overhead power lines shall be determined according to the following methods. 1 When the annual average temperature in the area is between 3°C and 17°C, the annual average temperature should be a multiple of 5 that is close to this number; 2 When the annual average temperature of the area is less than 3°C or greater than 17°C, the annual average temperature shall be reduced by 3°C to 5°C, and the multiple of 5 that is close to this number shall be taken. 4.0.3 The ice coating thickness of the wire or ground wire used in the design of overhead power lines can be 5, 10, 15, and 20mm on the basis of investigation, and the density of ice should be calculated as 0.9g/cm3; -5°C, the wind speed should be 10m/s. 4.0.4 The wind speed in the installation condition should be 10m/s, and there should be no ice. The temperature shall be adopted according to the following regulations. 1 In areas where the lowest temperature is -40°C, -15°C should be used; 2 In areas where the lowest temperature is -20°C, -10°C should be used; 3 In areas where the lowest temperature is -10°C, -5°C should be used; 4 In areas where the lowest temperature is -5°C, 0°C should be used. 4.0.5 The air temperature under lightning overvoltage conditions can be 15°C, the wind speed can be 15m/s for areas with a maximum design wind speed of 35m/s and above, and 10m/s for areas with a maximum design wind speed of less than 35m/s. 4.0.6 When checking the distance between the conductor and the ground wire, it should be considered as no wind and no ice. 4.0.7 The temperature of the internal overvoltage condition can be the annual average temperature, and the wind speed can be 50% of the maximum design wind speed, and should not be lower than 15m/s, and there is no ice. 4.0.8 Under the condition of maximum wind speed, it shall be calculated as no ice, and the air temperature shall be adopted according to the following regulations. 1 In areas where the lowest temperature is -10°C or below, -5°C should be used; 2 In areas where the lowest temperature is -5°C and above, +10°C should be adopted. 4.0.9 The wind speed of live working conditions can be 10m/s, the air temperature can be 15℃, and there is no ice. 4.0.10 The wind speed of the long-term load condition shall be 5m/s, and the temperature shall be the annual average temperature without ice. 4.0.11 The maximum design wind speed shall be 10m above the ground on the local open and flat ground, and the statistically obtained average maximum wind speed for 10 minutes once in 30 years; when there is no reliable data, the maximum design wind speed shall not be lower than 23.5m/s, and shall be Meet the following requirements. 1 The maximum design wind speed of overhead power lines in mountainous areas shall be determined according to local meteorological data; when there is no reliable data, the maximum design wind speed may be increased by 10% according to the wind speed of the nearby flat ground, and shall not be lower than 25m/s. 2 When the overhead power line is located in areas prone to strong winds such as river banks, lake banks, mountain peaks, and valley mouths, the maximum basic wind speed should be appropriately increased compared with that in nearby general areas; The length of the stretch section and the conditions of use of the pole tower should be appropriately left with a margin. 3 When overhead power lines pass through urban areas or forests, the average height of the shields on both sides is greater than 2/3 of the height of the tower, and the maximum design wind speed should be reduced by 20% compared with the local maximum design wind speed. 5 Conductors, ground wires, insulators and fittings 5.1 General provisions 5.1.1 Conductors of overhead power lines can use steel-cored aluminum stranded wires or aluminum stranded wires, and ground wires can use galvanized steel stranded wires. Corrosion-resistant and capacity-enhancing wires can be used in coastal areas and other areas where wire corrosion is serious. Where possible, energy-saving fittings can be used. 5.1.2 For overhead power lines of 10kV and below in urban areas, insulated aluminum stranded wires can be used in the following situations. 1 The route corridor is narrow, and the distance between it and the building cannot meet the safety requirements; 2 Lots adjacent to high-rise buildings; 3 Busy streets or densely populated areas; 4 Tourist areas and green areas; 5 Areas with seriously polluted air; 6 Building construction site. 5.1.3 The type of wire should be comprehensively determined according to the power system planning and design and engineering technical conditions. 5.1.4 The type of ground wire should be determined according to the requirements of lightning protection design and engineering technical conditions. 5.2 Wiring design 5.2.1 Under various meteorological conditions, the maximum operating tension and average operating tension should be used as the control conditions for the calculation of conductor tension sag. The tension sag calculation of the ground wire can use the maximum operating tension, the average running tension and the distance between the conductor and the ground wire as control conditions. 5.2.2 The distance between the wire and the ground wire at the center of the span shall meet the requirements of the following formula when the temperature is +15°C and there is no wind and no ice. 5.2.3 The maximum working tension of the wire or ground wire should not be greater than 40% of the instantaneous breaking tension of the stranded wire. 5.2.4 The upper limit of the average operating tension of the conductor or ground wire and the anti-vibration measures shall meet the requirements in Table 5.2.4. 5.2.5 The initial elongation of conductors or ground wires of 35kV and 66kV overhead power lines shall be determined through tests, and the influence of initial elongation of conductors or ground wires on sag can be compensated by cooling method. When there is no test data, the values listed in Table 5.2.5 may be used for the initial elongation and lowering temperature. 5.2.6 The sag reduction method can be used to compensate for the influence of the initial elongation of the wires on the sag of overhead power lines of 10kV and below. The sag reduction rate shall meet the following requirements. 1 Aluminum stranded wire or insulated aluminum stranded wire should use 20%; 2 12% should be used for steel-cored aluminum stranded wire. 5.3 Insulators and fittings 5.3.1 The mechanical strength of insulators and fittings shall be checked and calculated according to the following formula. 5.3.2 The installation design of insulators and fittings can adopt the safety factor design method. The mechanical strength safety factor of insulators and fittings shall comply with the provisions in Table 5.3.2. 6 Insulation coordination, lightning protection and grounding 6.0.1 The environmental pollution level of overhead power lines shall comply with the provisions in Appendix B of this specification. The pollution level can be comprehensively determined according to the approved pollution zoning map combined with factors such as operating experience, pollution and humidity characteristics, the nature of the dirt on the outer insulation surface, and its equivalent salt density. 6.0.2 The type and quantity of insulators for 35kV and 66kV overhead power lines shall be determined according to the unit creepage distance of the insulation. The creepage distance per unit of porcelain insulation shall comply with the provisions in Appendix B of this specification. 6.0.3 Suspension insulators should be used for 35kV and 66kV overhead power lines. In areas with clean air below an altitude of 1000m, the number of insulators in the suspension insulator string should adopt the values listed in Table 6.0.3. 6.0.4 The number of insulators in the tension insulator string should be one more than the insulator of the same type in the suspension insulator string. For a tower with a total height of more than 40m and a ground wire, an insulator should be added for every 10m increase in height. 6.0.5 The straight towers of 6kV and 10kV overhead power lines should use pin insulators or porcelain cross-arm insulators; the tension towers should use suspension insulator strings or insulator strings composed of butterfly insulators and suspension insulators. 1 The non-prestressed steel bars of partly prestressed reinforced concrete rods can also be used as grounding down conductors; 2 For reinforced concrete poles that use steel bars as grounding down-conductors, there should be reliable electrical connections between the steel bars and the grounding nuts and iron cross-arms; 3.Galvanized steel stranded wire can be used as the externally applied grounding down conductor, and its cross-section should not be less than 25mm2; 4 The cross-section of the lead wire of the grounding body should not be less than 50mm2, and should be hot-dip galvanized.7 tower type7.0.1 The multi-circuit poles and towers with different voltage levels of overhead power lines should be arranged with high voltage on top and low voltage on bottom. Overhead power lines in mountainous areas should adopt towers with all-round high and low legs. 7.0.2 The conductors of single-circuit towers of 35kV～66kV overhead power lines can be arranged in triangle or horizontal arrangement; the conductors of multi-circuit towers can be arranged in drum, umbrella or double triangle; Triangular arrangement or horizontal arrangement, the conductors of multi-circuit towers can be arranged in triangular and horizontal mixed arrangement or vertical arrangement; the conductors of towers below 3kV can be arranged horizontally or vertically. 7.0.3 The distance between conductors of overhead power lines should be determined in combination with operating experience and according to the following requirements. 1 The line-to-line distance between 35kV and 66kV towers shall be calculated according to the following formula. 2 For towers using suspension insulator strings, the distance between vertical lines shall meet the following requirements. 1) 66kV tower should not be less than 2.25m; 2) The 35kV tower should not be less than 2m. 3 For towers with insulated wires, the minimum distance between wires can be determined in combination with regional experience. For insulated conductors of 380V and below laid along the wall, when the span is not greater than 20m, the distance between the lines should not be less than 0.2m; for overhead power lines below 3kV, the horizontal distance between the two conductors close to the pole should not be less than 0.5m; 10kV The minimum line-to-line distance of towers up to and below shall comply with the provisions in Table 7.0.3. 7.0.4 For multi-circuit towers with insulated wires, the minimum vertical distance between cross-arms can be determined in combination with regional operating experience. For multi-circuit towers of 10kV and below and towers erected on the same pole with different voltage levels, the minimum vertical distance between cross-arms shall comply with the provisions in Table 7.0.4. Note. 0.45/0.6 in the table means 0.45m from the upper cross arm and 0.6m from the lower cross arm. 7.0.5 In areas where the design ice thickness is 5mm or less, the horizontal offset between the upper and lower conductors or between the conductors and the ground wire can be determined according to operating experience; in areas where the design ice thickness is 20mm or more, the conductors should use Arranged horizontally. For 35kV and 66kV overhead power lines, the horizontal offset between upper and lower conductors or between conductors and ground wires in ice-covered areas should not be less than the values listed in Table 7.0.5. 7.0.6 For towers using insulated conductors, the minimum horizontal distance between conductors of different circuits can be determined in combination with regional operating experience; for 3kV ~ 66kV multi-circuit towers, the minimum distance between conductors of different circuits should meet the requirements in Table 7.0.6. 7.0.7 For 66kV and 10kV lines on the same tower, the vertical distance between conductors of different voltage levels sh......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB 50061-2010_English be delivered?Answer: Upon your order, we will start to translate GB 50061-2010_English as soon as possible, and keep you informed of the progress. The lead time is typically 9 ~ 13 working days. 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