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1、F24Record No. 44815-2014DLElectric Power Industry Standard of the Peoples RepubKc of ChinaDL/T 13412014Technical Guide for Live Working on660kV DC Transmission LineIssue Date: March 18, 2014Implementation Date: August 1, 2014Issued by National Energy Administration of the Peoples Republic of Chinase
2、t of electrostatic protective clothing or conductive clothing. If it is necessary to disconnect the directly grounded overhead ground wires from the ground, the overhead ground wires shall be hung with earthing cables before maintenance.5.3.5 Before overhauling in the middle of the overhead ground w
3、ire span, in order to ensure his/her safety, the worker shall check whether the vertical distance between him/her and the live conductors below meets the minimum working distance requirements after the overhead ground wire in the work location is loaded by him/her, and whether the mechanical strengt
4、h of the overhead ground wire meets relevant requirements.5.3.6 When working on the uni-polar power-off side (the other pole is running), the worker shall wear a full set of electrostatic protective clothing or conductive clothing.5.3.7 When using insulating ropes to transfer large metal objects, th
5、e worker at ground potential or on the tower shall ground the metal objects before touching them.5.3.8 With regard to large metal objects (e.g. automobiles, etc.) insulated from the ground and placed near strong electric fields, attention shall be paid to protecting people from induced electrical in
6、jury. The metal objects must be grounded before they can be touched.5.4 Potential transfer5.4.1 The equipotential worker shall obtain permission from the person in charge of the work before potential transfer and shall not lose the protection of the safety belt.5.4.2 For potential transfer of DC tra
7、nsmission lines, the potential rod should be used, which shall be in reliable contact with live conductors. Before entering equipotential, the worker shall contact the potential rod quickly with the live conductors at a distance of about 0.4m from them. When leaving equipotential, the worker shall c
8、ontact the potential rod with the live conductors first, and then withdraw the potential rod quickly after leaving the live conductors 0.4m away.5.4.3 During potential transfer, the action shall be smooth, accurate and fast.6 Enter or leave equipotential1.1 Enter or leave equipotential on a suspensi
9、on tower1.1.1 When entering or leaving equipotential on a suspension tower, the worker shall not enter or leave equipotential vertically from the cross arms or along the insulator strings. The hanging basket (hanging chair and hanging ladder) method, the insulating flexible ladder method and other m
10、ethods may be used to enter and leave equipotential.1.1.2 When the worker enters or leaves equipotential, all the electrical gap distances (including the working distances and the combined gaps) between the worker and the earthing conductors and the live conductors shall meet the requirements of Tab
11、les 3 and Table 4.1.1.3 The hanging baskets (hanging chairs and hanging ladders) shall be stably suspended by insulating slings, and the moving speed shall be strictly controlled by insulating pulley sets to achieve a uniform and slow speed. The length of the insulating slings for fixing shall be ac
12、curately calculated or actually measured to ensure that the highest part of the human body shall not exceed the upper edge of the grading ring on the conductor side when the worker enters or leaves equipotential.1.2 Enter or leave equipotential on a tension tower1.2.1 When entering or leaving equipo
13、tential on a tension tower, the worker may enter or leave equipotential along horizontal tension insulator strings or via other methods.1.2.2 When the worker moves along the horizontal tension insulator strings, the positions of his/her hands and feet must be kept consistent, and the number of good
14、insulators short-circuited by the human body and tools shall meet the requirements of Table 5.1.2.3 The workers safety protection rope shall be tied to the insulator string held by his/her hands and shall move synchronously with him/her.1.2.4 When entering or leaving equipotential, the worker shall
15、transfer potential when moving to a distance of about 0.4m (2 3 insulators) from the live conductors before carrying out subsequent operations.1.2.5 All the electrical gap distances (including the working distances and the combined gaps) between the worker and the earthing conductors and the live co
16、nductors, and the number of good insulators short-circuited by the human body or tools shall meet the requirements of Table 5.7 Matters needing attention at work7.1 The workers shall avoid excessive body movements during live working.7.2 Insulating tools shall be used to transfer articles between th
17、e equipotential worker and the ground potential worker. The effective length of the insulating tools shall meet the requirements of Table 2.7.3 The conductive clothing shall be free from damage and holes, and all parts of it shall be connected well and reliably. When damage and burrs are found, it s
18、hall be repaired in time, and it can be used only after passing the test.7.4 Before the insulating tools are used, an insulation resistance tester shall be used to conduct segmented insulation tests. The width of the measuring electrodes is 2cm, and it is required that the insulation resistance betw
19、een every 2cm of measuring electrodes shall not be less than 700MQ.7.5 The insulating tools shall be protected from moisture and surface damage and dirt when used. The insulating tools to be used shall be placed on clean, dry and moisture-proof pads. When found dampened or surface-damaged or surface
20、-dirty, they shall be handled in time and can be used only after passing the test.7.6 During the work, bearing tools shall be fixed and reliable and have backup protection.7.7 If deteriorated or low resistance insulators are found during live testing of insulators, they shall be retested 2-3 times t
21、o avoid misjudgment.7.8 When the first insulator near the cross arm is dismantled or installed, it must be short-circuited before operation.8 Test of tools, devices and equipment8.1 The design of live working tools, devices and equipment shall conform to the requirements of GB/T 18037.Conductive clo
22、thing, insulating ropes, insulating rods, insulator holders, etc., shall pass type tests and leaving factory tests in accordance with the requirements of GB/T 6568, GB/T 13035, GB 13398, DL/T 463, DL/T 878.8.2 The tools, devices and equipment shall be subjected to electrical tests and mechanical tes
23、ts on a regular basis according to the test methods of DL/T 976. The test cycles are as follows:a) electrical tests. Preventive tests shall be conducted once a year, and inspection tests shall be conducted once a year, and the interval between two tests shall be half a year.b) mechanical tests. Prev
24、entive tests shall be conducted once every two years for insulating tools and once every year for metal tools.8.3 Preventive tests8.3.1 DC withstand voltage test: the insulation length of the test sample between the test electrodes shall be 4.8m; the withstand voltage shall be 755kV; the time shall
25、be 3min. It is qualified if no breakdown, flashover or overheating occur.8.3.2 Switching impulse withstand voltage test: the insulation length of the test sample between the test electrodes shall be 4.8m; the standard switching impulse wave (+250|is/2500|is) shall be applied; the voltage amplitude s
26、hall be 1325kV; the test sample shall withstand 15 times. It is qualified if no breakdown or flashover occur.8.3.3 Static load test: a load of 1.2 times the weight of the rated working load shall be applied for Imin. It is qualified if no deformation or damage occur.8.3.4 Dynamic load test: 3 times
27、of actual operations shall be done with a load of 1.0 times the weight of the rated working load applied. It is qualified if the tools are flexible, portable and free from jamming.8.4 Inspection tests8.4.1 The insulating tool shall be divided into several sections for power frequency withstand volta
28、ge tests. A voltage of 75kV shall be applied across per 300mm of the insulating tool for Imin. It is qualified if no breakdown, flashover or heating occur.8.4.2 The whole set of conductive clothing shall be free of damage, holes and burrs in the appearance inspection, and the connecting devices of a
29、ll parts shall be reliable and intact, with good conduction after connection.9 Transportation and storage of tools, devices and equipment9.1 During transportation, the insulating tools, devices and equipment shall be put into dedicated tool bags, toolboxes or tool vehicles to prevent moisture and da
30、mage.9.2 Holders and clamps with low surface hardness and metal tools (such as screw rods) that should not be bumped shall be transported with dedicated wooden or leather toolboxes. The capacity of each box shall be limited to one set of tools. Scattered parts shall be fixed in the box.9.3 The insul
31、ating tools, devices and equipment shall be protected from moisture, rain and blazing sun during transportation and maintenance. Plastic bags may be used as inner packaging transportation bags, and canvas bags or dedicated leather (canvas) boxes may be used as outer packaging transportation bags.9.4
32、 The live working tools, devices and equipment shall be stored in a dedicated depot, and the depot for live working tools shall meet the requirements of DL/T 974.Table of ContentsForewordII1 Scope12 Normative references13 Terms and definitions24 General requirements25 Technical requirements46 Enter
33、or leave equipotential87 Matters needing attention at work98 Test of tools, devices and equipment99 Transportation and storage of tools, devices and equipment11Table of ContentsForewordII1 Scope12 Normative references13 Terms and definitions24 General requirements25 Technical requirements46 Enter or
34、 leave equipotential87 Matters needing attention at work98 Test of tools, devices and equipment99 Transportation and storage of tools, devices and equipment11Table of ContentsForewordII1 Scope12 Normative references13 Terms and definitions24 General requirements25 Technical requirements46 Enter or l
35、eave equipotential87 Matters needing attention at work98 Test of tools, devices and equipment99 Transportation and storage of tools, devices and equipment11ForewordThis standard was compiled in accordance with the task arranged by Notice of the National Energy Administration on Issuing the First Bat
36、ch of Industry Standard Formulati()n(Revisi(m) Plans in the Energy Sector in 2010 (No. 320 of the Department of Science and Technology of the National Energy Administration).This standard was proposed by the China Electricity Council.This standard was prepared by the National Technical Committee of
37、Standardization for Live Working.Main drafting organizations of this standard: China Electric Power Research Institute, State Grid Shandong Electric Power Company, and State Grid Shanxi Electric Power Company.Main drafters of this standard: LIU Kai, HU Yi, XIAO Bin, LIU Hongzheng, LIU Ting, MENG Hai
38、lei, YONG Jun, NIU Biao, DONG Yanwu, LIU Yan, PENG Yong, and SU Ziming.During the process of implementing this standard, relevant opinions or advice can be fed back to the Standardization Management Center of the China Electricity Council (No.l, Lane 2, Baiguang Road, Beijing, 100761).Technical Guid
39、e for Live Working on 660kV DC Transmission Line1 ScopeThis standard specifies the technical requirements and matters needing attention for live working on 660kV DC transmission lines, as well as the test, transportation and storage of the working tools .This standard is applicable to live working o
40、n 660kV DC transmission lines in areas with an altitude of 2000m and below.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenc
41、ed document (including any amendments) applies.GB/T 2900.55 Electrotechnical Terminology 一 Live Working (eqv IEC 60050651)GB/T 6568 Screen Clothes for Live Working (GB/T 65682008, IEC 60895: 2002, MOD)GB/T 13035 Live Working 一 Insulating RopesGB 13398 Insulating Hollow Tubes and Foam-Filled Tubes an
42、d Solid Rods for Live WorkingGB/T 14286 Live Working Terminology for Tools, Equipment and Devices(GB/T 142862008, IEC 60743: 2001, MOD)GB/T 18037 Technical Requirements and Design Guide for Live Working ToolsGB 26859 Safety Code of Electric Power Industry - Part of Electric LinesDL/T 463 Insulator H
43、older for Live WorkingDL/T 876 Guide of Insulation Coordination for Live WorkingDL/T 878 Test Guide of the Insulating Tool for Live WorkingDL/T 966 Technical Guide for Live Working in Transmission LineDL/T 974 Depot of Tools for Live-WorkingDL/T 976 Preventive Test Code of Tools, Devices and Equipme
44、nt for Live Working3 Terms and definitionsFor the purposes of this standard, the terms and definitions given in GB/T 2900.55 and GB/T 14286 as well as the following apply.3.1 live working on DC transmission linelive-line repair, maintenance, and replacement of parts carried out on DC transmission li
45、nes3.2 potential rodmetal tool used by an equipotential worker when entering or leaving equipotential, in order to reduce the impact of discharge arc on the human body and avoid possible damage to conductive clothing caused by pulsed current3.3 electric field shield maskmask made of conductive mater
46、ials, used for electric field protection of the workers face, and connected with other screen tools for integral use4 General requirements4.1 Personnel requirements4.1.1 Live working workers shall be in good health and free from physical and psychological obstacles that hinder work. They shall have
47、a basic knowledge of electrical principles and power lines, master the basic principles and operating methods of live working, and be familiar with the scope of application and using methods of the working tools. They shall be familiar with GB 26859, DL/T 966 and this standard. They shall master eme
48、rgency rescue methods, especially the electric shock rescue. They shall receive theoretical and operational training from specialized training institutions, pass relevant examinations and hold relevant certificates.4.1.2 The person in charge of the work (or the safety guardian) shall have at least 3 years of actual working experience in live working on power transmission lines, be familiar with equipment conditions, have certain organizational capability and accident handling ability, and pass the examination after special training.4.2 Institutional requirementsAccording to GB 26859