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| Standard ID | DL/T 741-2019 (DL/T741-2019) | | Description (Translated English) | Operating code for overhead transmission line | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Word Count Estimation | 39,311 | | Date of Issue | 2019-06-04 | | Date of Implementation | 2019-10-01 | | Older Standard (superseded by this standard) | DL/T 741-2010 | | Regulation (derived from) | Natural Resources Department Announcement No. 7 of 2019 |
DL/T 741-2019
Operating code for overhead transmission line
DL/T 996-2019
ICS 29.240.20
F 23
People's Republic of China Electric Power Industry Standard
Replace DL/T 741-2010
Operating Regulations for Overhead Transmission Lines
2019-06-04 released
2019-10-01 implementation
Issued by National Energy Administration
Table of contents
Foreword...II
1 Scope...1
2 Normative references...1
3 Terms and definitions...2
4 Basic requirements...3
5 Operating standards...4
6 Tour...7
7 Testing...9
8 Repair...10
9 Operational requirements for special sections...13
10 Operational requirements of line protection zone...17
11 Environmental protection of transmission lines...18
12 Technical Management...20
Appendix A (Informative Appendix) Treatment of Broken Strand Damage of the Ground Wire...24
Appendix B (Normative Appendix) Distance and Crossover of Line Conductor to Ground...26
Appendix C (Normative Appendix) Minimum Air Gap for Lines of Various Voltage Levels...31
Appendix D (informative appendix) Effective coefficient Ke value of creepage distance of different types of insulators...32
Preface
This standard was drafted in accordance with the rules of the national standard GB/T 1.1-2009.
Please note that certain contents of this document may involve patents. The issuing agency of this document is not responsible for identifying these patents.
Compared with DL/T 741-2010, the main changes of this standard are as follows.
--The original standard is applicable to AC 110(66)kV～750kV overhead transmission lines. With the development of transmission voltage levels in my country in recent years,
In particular, the DC transmission voltage level is further improved, and the operation and maintenance of AC and DC transmission lines have many common points. Therefore, the scope of this standard is adjusted.
It is suitable for AC 110(66)kV and above, DC ±400kV and above overhead transmission lines, 35kV overhead lines and
Other overhead transmission lines can be used as reference.
--In order to standardize terms, the terms and definitions of the original standard have been expanded to the relevant content of DC transmission lines.
--With the promotion and application of helicopter inspections and drone inspections of transmission lines, the relevant content of three-dimensional inspections has been added.
Appendix A and Appendix D of this standard are informative appendices, and Appendix B and Appendix C are normative appendices.
After the implementation of this standard, it will replace DL/T 741-2010.
This standard was proposed by the China Electricity Council.
This standard is under the jurisdiction of the National Overhead Line Standardization Technical Committee Line Operation Subcommittee.
The main drafting organizations of this standard. China Electric Power Research Institute Co., Ltd., State Grid Co., Ltd., State Grid Hubei Electric Power Co., Ltd.
Company, State Grid Jiangxi Electric Power Co., Ltd., State Grid Shandong Electric Power Company, State Grid Zhejiang Electric Power Co., Ltd., State Grid Heilongjiang Electric Power Company
State Grid Hunan Electric Power Co., Ltd., Yunnan Power Grid Co., Ltd., State Grid Shanxi Electric Power Company, State Grid Gansu Electric Power Company
Division.
The main drafters of this standard. Shao Guiwei, Wang Jian, Yi Hui, Ma Jianguo, Cai Huanqing, Zhang Yu, Zheng Lianyong, Jiang Wendong, Li Ziming, Gong
Zheng Xiong, Liu Jinghua, Huang Xiuqian, Peng Bo, Zhou Guohua, Niu Biao, Kong Chenhua, Wang Haiyue, Fu Jing, Zhang Lihua, Li Yonglai, Ji Huizheng, Liu
Hong Zheng, Yin Hong, Jin Yijiong, Chen Liming.
This standard was first issued on February 12,.2001; it was issued for the second time on May 24,.2010, this is the second revision.
The opinions or suggestions during the implementation of this standard are fed back to the Standardization Management Center of China Electricity Council (Baiguang, Xicheng District, Beijing)
Lu Er Tiao No. 1, 100761).
Operating Regulations for Overhead Transmission Lines
1 Scope
This standard specifies the basic requirements and operating standards for the operation of overhead power transmission lines, and provides inspection, inspection, maintenance, and technical
Management, etc. put forward specific requirements, and put forward clear regulations on the maintenance of special sections of transmission lines, protected areas, and line environmental protection.
This standard is applicable to overhead transmission lines with voltage levels of 110 (66) kV AC, ±400 kV and above (including grounding electrode lines).
35kV overhead lines and other overhead transmission lines can be used as reference.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
GB/T 2900.51 Electrical terminology overhead line
GB/T 4365 EMC terminology
GB/T 25094 General technical requirements for emergency repair of overhead transmission lines
GB/T 26218.1 Selection and size determination of high-voltage insulators used under polluted conditions Part 1.Definitions, information and general principles
GB/T 32673 Technical Guidelines for Inspection of Overhead Transmission Line Faults
GB/T 35695 Technical Guidelines for Prevention and Control of Bird-related Faults in Overhead Transmission Lines
GB/T 35706 Technical Guidelines for Plotting Distribution Map of Ice Zones in Power Grid
GB 50064 Design Code for Overvoltage Protection and Insulation Coordination of AC Electrical Equipment
GB 50233 Code for Construction Acceptance of 110kV～750kV Overhead Transmission Lines
GB 50545 110kV～750kV design code for overhead transmission lines
GB 50665 Design Code for 1000kV Overhead Transmission Line
GB 50790 ±800kV DC Overhead Transmission Line Design Code
DL/T 288 Technical Guidelines for Helicopter Inspection of Overhead Transmission Lines
DL/T 289 Helicopter inspection operation sign for overhead transmission lines
DL/T 409 Electric Safety Work Regulations (Part of Power Line)
DL/T 626 Inspection Regulations for Deteriorated Suspension Insulators
DL/T 627 Room temperature curing silicone rubber anti-pollution flashover coating for insulators
DL/T 815 Composite outer metal oxide arrester for AC transmission line
DL/T 887 Tower power frequency grounding resistance measurement
DL/T 1000.3 Guidelines for the use of insulators for overhead lines with a nominal voltage higher than 1000V Part 3.Rod-type suspension complexes for AC systems
Combined insulator
DL/T 1069 Guidelines for repairing the ground conductor of overhead transmission lines
DL/T 1122 Technical Guidelines for Insulation Configuration of Overhead Transmission Lines
DL/T 1248 Overhead transmission line condition inspection guide
DL/T 1249 Technical Guidelines for Operation State Evaluation of Overhead Transmission Lines
DL/T 1367 Technical Guidelines for Transmission Line Inspection
DL/T 1482 Technical Guidelines for UAV Inspection Operation of Overhead Transmission Lines
DL/T 1570 Overhead transmission line bird-related fault risk classification and distribution map drawing
DL/T 5130 Technical regulations for design of steel pipe poles for overhead transmission lines
DL/T 5235 ±800kV and below DC overhead transmission line engineering construction and acceptance regulations
DL/T 5300 1000kV Overhead Transmission Line Project Construction Quality Inspection and Evaluation Regulation
Order of the President of the People's Republic of China No. 24 "The Electricity Law of the People's Republic of China" April.2015
Order No. 239 of the State Council of the People's Republic of China "Regulations on the Protection of Power Facilities" January.2011
Order No. 10 of the National Development and Reform Commission of the People’s Republic of China "Implementation Rules for the Regulations on the Protection of Electric Power Facilities" June.2011
3 Terms and definitions
The following terms and definitions defined in GB/T 2900.51 and GB/T 4365 apply to this document.
3.1
Residential area
Densely populated areas such as industrial enterprise areas, ports, docks, railway stations, towns, and villages belong to the public environment.
3.2
Nonresidential area
Areas other than the above-mentioned residential areas are all non-residential areas. Although people, vehicles or agricultural machinery often arrive, but there is no house or house
The scarce areas are also non-residential areas.
3.3
Residential residences
A building where people live for a long time, including rooms or platforms. It also includes hospitals, kindergartens,
Schools, office buildings and other buildings where people live or work for a long time.
3.4
Area of minute meteorological phenomena
Refers to a local area within a large area. Due to special changes in terrain, location, slope, temperature, humidity, etc., there are differences
A more special local meteorological area in a large area that has a serious impact on the safe operation of the line.
3.5
Area of micro-topography
It is a small area in a large terrain area. According to the classification of micro-topography, there are mainly passway type, mountain watershed type, and water vapor increase
Type, terrain uplift type, canyon air duct type, etc.
3.6
Adverse geological area
Areas where there is a risk of geological disasters such as landslides, mudslides, quicksand, ground subsidence, surface cracks or ground subsidence, or due to underground mining operations
The area where karma causes or may cause the surface to move and deform.
3.7
Earth electrode line
The line connecting the neutral bus of the converter station with the grounding electrode feeder.
3.8
Line inspection
In order to grasp the operating status of the line, discover defects or hidden dangers in the line body, auxiliary facilities and line protection
Provide basis for road overhaul, maintenance and condition evaluation (assessment), and conduct observation, inspection and recording of the line at close range. According to different
According to the needs, line inspections can be divided into three types. normal inspections, fault inspections, and special inspections.
3.9
Regular inspection
The inspection of the line in a certain period, including line equipment (referring to line body and auxiliary equipment) and line protection area (line
Road channel).
3.10
Fault inspection
The operation unit organizes a line inspection to find out the fault point, the cause of the fault and the fault situation.
3.11
Special inspection
Under special circumstances or according to special needs, line inspections conducted by special inspection methods. Special inspections include. night inspections,
Cross patrols, pole tower inspections, patrols to prevent damage from external forces, etc.
3.12
Important crossing
Overhead transmission lines span major railways such as high-speed railways, electrified railways, expressways, first-class highways, and important transmission lines.
Facilities, which will cause major personal injury and death, major equipment damage, large-scale blackouts and other major social impacts and safety incidents in the event of failure
The road crosses the section.
3.13
Special section
The special section of the overhead transmission line refers to the line area that is different from other conventional sections in the line design and operation, and has been specially designed and constructed.
segment. Special sections mainly include. large spans, important crossings, mine-prone areas, heavily polluted areas, heavy ice areas, bird-related failure areas, areas prone to damage by external forces,
Micro-topography, micro-weather areas, and poor geological areas.
3.14
Large crossing
The line crosses navigable rivers, lakes or straits, etc., due to the large span or taller towers, special consideration is required for wire selection or tower design, and
When the failure occurs, it will seriously affect the shipping or repair the particularly difficult tensile section.
3.15
Transmission line protected region
The wire edge extends horizontally to the outside for a certain distance and is perpendicular to the area in the two parallel planes formed by the ground.
3.16
Electromagnetic environment of transmission line
The electric field effect and magnetic field effect produced by the line voltage and current during the operation of the transmission line, and the radio interference produced by the corona effect
Disturbance and audible noise.
3.17
Total electric field strength above ground
The combined ground field strength of the electrostatic field generated by the electric charge on the wire and the electric field generated by the space charge.
3.18
Ion current density
Under the action of the electric field, the space charge continuously moves to the ground, and the current received per unit area of the ground is called the ion current density.
4 Basic requirements
4.1 The operation of the line should implement the policy of "safety first, prevention first, and comprehensive management", and implement the relevant regulations of DL/T 409.Luck
The line maintenance unit should do a good job in the inspection, inspection, maintenance and management of the line, and should actively adopt advanced technology and implement scientific management, and continuously
Summarize experience, accumulate information, master the law, and ensure the safe operation of the line.
4.2 The operation and maintenance unit shall participate in route planning, feasibility study, route selection, design review, pole and tower positioning, material and equipment selection
The management of the whole production process such as model, bidding, construction acceptance, etc., and put forward requirements and measures based on the characteristics of the region, operating experience and anti-accident measures
It is recommended to coordinate design and operation.
4.3 Each line should have clear operation and maintenance management boundaries, and it should be clearly demarcated with power plants, substations, user units and adjacent operation and management units.
At the dividing point, there should be no blank spots.
4.4 The operation and maintenance unit should establish a sound post responsibility system, and the operation and management personnel should master the equipment status and maintenance technology, and be familiar with relevant regulations
System, frequently analyze the operation of the line, propose and implement measures to prevent accidents and improve the level of safe operation. If an accident occurs, it should be
The relevant provisions of the investigation of safety accidents are carried out.
4.5 The operation and maintenance unit shall improve the responsibility system for important cross-operation and maintenance guarantee.
4.6 Operation and maintenance units shall strictly abide by the implementation of the "Electric Power Law of the People's Republic of China", "Regulations on the Protection of Power Facilities", and "Power Facilities
Implementation Rules of the Protection Regulations" and other relevant laws and regulations, carry out publicity and education of power facilities protection and mass protection of lines, establish and improve power facilities
Implement protection work mechanisms and accountability systems, strengthen line protection area management, and prevent external damage.
4.7 Operation and maintenance units should strengthen communication with relevant government departments such as agriculture and forestry, public security, and safety supervision, and establish relations with railway, highway, shipping and other units.
Coordination mechanism to ensure the safe and stable operation of transmission lines.
4.8 For newly built and rebuilt lines, acceptance and transfer shall be carried out in accordance with relevant standards and regulations such as GB 50233.
4.9 The operation and maintenance unit shall, based on the operation experience and the relevant requirements of DL/T 1249 and DL/T 1248, on the basis of line status analysis and evaluation
On the basis of this, carry out the maintenance of line status.
4.10 New-type towers, wires, fittings, insulators and tools shall be used after passing the test.
4.11 The configuration of the external insulation of the line shall be in accordance with the requirements of relevant standards such as GB 50064, combined with operating experience, and comprehensive consideration of pollution prevention, lightning protection, and protection.
Wind deviation, anti-icing and other factors.
4.12 The operation and maintenance unit shall carry out minefields, polluted areas, ice areas, and bird-related faults in accordance with relevant standards such as GB/T 35706 and DL/T 1570.
The risk distribution map is drawn and updated regularly to provide guidance for the operation of special sections.
4.13 For transmission lines in special sections such as areas prone to external damage, bird-related failure areas, micro-weather areas, micro-topography areas, and poor geological areas,
Inspections should be strengthened and targeted technical measures should be taken.
4.14 There should be line name, tower number, phase, and necessary safety and protection signs on the poles of the line. Double-circuit and multi-circuit lines on the same tower
There should be eye-catching signs.
4.15 During operation, the maintenance of auxiliary facilities such as bird prevention devices, signs, warning signs and related monitoring devices should be strengthened to ensure that they are intact.
5 Operating standards
5.1 Tower and foundation
5.1.1 The cement on the surface of the foundation should not fall off, the steel bars should not be exposed, the prefabricated and plug-in foundations should not be corroded, and the soil around the foundation should be protected
It should not be lost or collapsed; the foundation retaining wall or slope protection should not have cracks, subsidence or deformation; the foundation drainage ditch should not be blocked, landfilled or silted;
The protection measures for the grounding body of the high and low leg foundation should not be invalid; the anticorrosive insulation treatment of the insulation foundation of the UHV DC overhead grounding electrode line should meet the design
Requirements. The protection distance of the foundation slope should meet the requirements of standards such as GB 50545.
5.1.2 There should be no water seepage at the contact between the main material of the tower leg and the protective cap, and the protective cap or the top surface of the foundation should have a slope of scattered water; no stacking around the tower legs
Corrosive, flammable and other items; anti-corrosion measures should be taken for the main materials of tower legs in severely polluted areas.
5.1.3 The poles and towers in permafrost areas are equipped with the foundations of hot rods. The inclination of the hot rods should not be greater than 30º.
The fins should be gnawed, squeezed, and fallen, and there should be no dirt, sand, oil, wood chips, hanging foreign objects, etc. between the fins.
5.1.4 The inclination of the poles and towers of the AC line, the deflection of the pole (tower) top, and the skew degree of the cross arm shall not exceed the requirements in Table 1.
5.1.6 The tensile tower should not be inclined to the inner angle after being stressed.
5.1.7 After the terminal tower is under force, it should not be inclined to the direction of the force or the tower head should not lean to the side of the force beyond the vertical line.
5.1.8 The curvature between adjacent nodes of the main material of the iron tower should not exceed 0.2%, and the UHV steel pipe tower should not exceed 0.1%.
5.1.9 The protective layer of reinforced concrete poles should not corrode and fall off and the steel bars should be exposed. Ordinary reinforced concrete poles should not have longitudinal or transverse cracks.
The width of the gap should not exceed 0.2mm, and the prestressed reinforced concrete rod should not have cracks.
5.1.10 The diameter reduction value of the pull rod after corrosion shall not exceed 2mm.
5.1.11 The thickness and width of the buried layer of the cable foundation shall not be reduced.
5.1.12 The strands of the galvanized steel strands of the pull wire should not be broken, and the galvanized layer should not be rusted or peeled off.
5.1.13 The tension of the cable should be uniform and there should be no slack.
5.1.14 The connecting bolts of the tower should not be loosened, and the tightening torque of the bolts of the corresponding specifications should meet the requirements of Table 3.If the requirements in Table 3 are not met,
One is tightened.
5.2 Wire and ground
5.2.1 There should be no corrosion, peeling off or fatigue on the surface of the conductor and ground wire.
5.2.2 There should be no damage, broken strands, severe corrosion, etc. to the conductor and ground wires. The damage condition of the conductor and ground wire shall be conducted in accordance with the provisions of DL/T 1069.
Evaluate and classify the conditions, and determine the corresponding repair methods. Treatment of strength loss or reduction of cross-section due to broken strands and damage of conductor and ground wire
Refer to Appendix A for the method. If necessary, it can be subjected to a strength test, and the strength test value should not be less than 80% of the original damage value.
5.2.3 The sag deviation of the lead wire and the ground wire should not exceed the requirements in Table 4.
5.2.4 The relative sag deviation between conductor phases should not exceed the requirements of Table 5.
5.2.5 The relative sag value of the same phase sub-conductor of the phase split conductor should not exceed the following value. the vertical arrangement of the double split conductor is 100 mm; other arrangements
Split conductor 220kV is 80 mm, AC 330kV and above, DC ±400kV and above 50 mm.
5.2.6 The OPGW ground lead should not be loose or discharged to the ground, and the straight-through tensile jumper should not directly touch the ground wire support or the tower body.
5.2.7 The distance between the conductor and the ground and the crossover distance should meet the requirements of Appendix B.
5.2.8 The minimum air gap of each voltage circuit should meet the requirements of Appendix C.
5.2.9 The jumper should not have any of the following conditions.
a) Broken strands, damage, surface corrosion, peeling of the outer layer and other reasons cause the cross-section to decrease;
b) Twisted strands, loose strands, and sprains.
5.3 Insulator
5.3.1 The umbrella skirt of the porcelain insulator should not be damaged, the porcelain should not be cracked, and the enamel should not be burnt.
5.3.2 Glass insulators should not explode or have cracks on the surface.
5.3.3 The umbrella skirt and sheath of rod-shaped and disc-shaped composite insulators should not be damaged or cracked, falling off, or corroded, and the end seal should not be cracked,
Ageing.
5.3.4 The steel caps, insulating parts, and steel feet should be on the same axis. The steel feet, steel caps, and glue-mounted cement should not be cracked, skewed, deformed or severely rusted.
Corrosion, the gap between the steel foot and the steel cap notch should not exceed the standard.
5.3.5 The insulation resistance of disc insulators, 330kV and below lines should not be less than 300MΩ, AC 500kV and above, DC ±400kV and
The above line insulators (including grounding pole insulators) should not be less than 500MΩ.
5.3.6 The distributed voltage of disc insulators should not be zero or low.
5.3.7 The locking pin should not fall off and deform.
5.3.8 There should be no serious scaling or cracks on the porcelain insulation cross arm, and there should be no enamel burnout, porcelain damage, or umbrella skirt damage.
5.3.9 The sheath of the composite cross arm shall not be damaged, cracked, or falling off.
5.3.10 The deflection angle of the linear pole tower insulator string along the line (except for the pre-deflection required by the design) should not be greater than 7.5°, or the maximum deflection value should not be greater than 7.5°.
Should be greater than 300mm; the end offset of the insulating cross arm should not be greater than 100mm. Maximum offset value of UHV linear tower insulator string along the line direction (except
The pre-offset required by the design) should not be greater than 400mm.
5.3.11 Ground wire insulators and discharge gaps shall not show non-lightning discharge or burns.
5.3.12 The c......
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