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DL/T 400-2019

Chinese Standard: 'DL/T 400-2019'
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DL/T 400-2019English199 Add to Cart Days<=3 Technical guide for live working in 500kV AC compact transmission line Valid DL/T 400-2019
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BASIC DATA
Standard ID DL/T 400-2019 (DL/T400-2019)
Description (Translated English) Technical guide for live working in 500kV AC compact transmission line
Sector / Industry Electricity & Power Industry Standard (Recommended)
Classification of Chinese Standard F20
Classification of International Standard 29.240.20
Word Count Estimation 10,117
Date of Issue 2019-06-04
Date of Implementation 2019-10-01
Older Standard (superseded by this standard) DL/T 400-2010
Quoted Standard GB/T 2900.55; GB/T 6568; GB/T 13035; GB 13398; GB/T 14286; GB/T 18037; GB 26859; DL 409; DL/T 463; DL/T 876; DL/T 878; DL/T 974; DL/T 976
Drafting Organization China Electric Power Research Institute Co., Ltd.
Administrative Organization National Technical Committee for Standardization of Live Work
Regulation (derived from) Natural Resources Department Announcement No. 7 of 2019
Summary This standard specifies the technical requirements for live working on 500kV AC compact transmission lines, the test of in and out equipotential and tools, transportation and storage, etc. This standard applies to live work on 500kV single and double-circuit AC compact transmission lines at an altitude of 3000m and below.

DL/T 400-2019
Technical guide for live working in 500kV AC compact transmission line
ICS 29.240.20
F 20
People's Republic of China Electric Power Industry Standard
Replace DL/T 400-2010
Live working on 500kV AC compact transmission line
Technical guidelines
2019-06-04 released
2019-10-01 implementation
Issued by National Energy Administration
Table of contents
Foreword...I
1 Scope...1
2 Normative references...1
3 Terms and definitions...1
4 General requirements...1
5 Technical requirements...2
6 In and Out Equipotential...5
7 Precautions during operation...6
8 Testing of tools and instruments...7
9 Transportation and storage of tools and instruments...7
Preface
This standard is based on the rules given in GB/T 1.1-2009 "Guidelines for Standardization Part 1.Structure and Compilation of Standard Compilation"
grass.
This standard is a revision of DL/T 400-2010 "Technical Guidelines for Live Working on 500kV AC Compact Transmission Lines", and is in line with DL/T
The main changes from 400-2010 are as follows.
--Extend the scope of application to single and double-circuit 500kV AC compact lines in areas of 3000m and below;
--Increase the technical requirements for one-time live operation and another stoppage of the power line;
This standard was proposed by the China Electricity Council.
This standard is under the jurisdiction of the National Technical Committee for Standardization of Live Work.
The main drafting organizations of this standard. China Electric Power Research Institute Co., Ltd., State Grid Zhejiang Electric Power Co., Ltd. Jinhua Power Supply Company,
Grid Shandong Electric Power Company, State Grid Jiangsu Electric Power Co., Ltd., State Grid Hubei Electric Power Co., Ltd.
The main drafters of this standard. Lei Xinglie, Fang Yuqun, Liu Ting, Liu Kai, Sun Xiaobin, Han Xuechun, Kong Xiaofeng, Huang Zhenning, Ma Jianguo,
Hu Chuan, Peng Yong, Wang Bin, potential group.
After the implementation of this standard, it will replace DL/T 400-2010.
This standard was first published on January 9,.2011, and this is the first revision.
The opinions or suggestions during the implementation of this standard are fed back to the Standardization Management Center of China Electricity Council (No. 2 Baiguang Road, Beijing)
Number One, 100761)
Technical Guidelines for Live Working on 500kV AC Compact Transmission Lines
1 Scope
This standard specifies the technical requirements for live working of 500kV AC compact transmission lines, the test, transportation and protection of in and out equipotential and tools.
Tube and so on.
This standard applies to live work on 500kV single and double-circuit AC compact transmission lines at an altitude of 3000m and below.
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 2900.55 Electrician Terminology Live Work
GB/T 6568 Shielding clothing for live working
GB/T 13035 Insulated rope for live working
GB 13398 Hollow insulating pipe, foam-filled insulating pipe and solid insulating rod for live working
GB/T 14286 Terminology for live working tools and equipment
GB/T 18037 Basic technical requirements and design guidelines for live working tools
GB 26164.3 Safety Work Rules for the Electric Industry Part 3.Power Lines
DL 409 Electrical Safety Work Regulations (Part of Power Lines)
DL/T 463 Insulator clamp for live working
DL/T 876 Insulation coordination guidelines for live working
DL/T 878 Test guidelines for insulating tools for live working
DL/T 974 Tool warehouse for live working
DL/T 976 Preventive test procedures for live working tools, devices and equipment
3 Terms and definitions
The following terms and definitions defined by GB/T 2900.55 and GB/T 14286 apply to this document.
3.1
Live working with protective gap
Install protective gaps between adjacent poles and towers at the working point to limit live maintenance after overvoltage at the working point.
4 General requirements
4.1 Personnel requirements
4.1.1 Live workers should be healthy and free from physical and psychological obstacles that hinder the work.
4.1.2 Live working personnel should have basic knowledge of electrician principles, master the basic principles and operation methods of live working, and be familiar with working workers
The scope of application and method of use of the appliance. Should master the emergency rescue method, especially electric shock first aid.
4.1.3 Live working personnel should pass special training, pass the examination and have a job certificate.
4.1.4 The person in charge of the work (or guardian) should have more than 3 years of actual working experience in live work on transmission lines with a voltage level of 500kV and above.
Be familiar with equipment conditions, and have certain organizational capabilities and accident handling capabilities.
4.2 System requirements
It should be implemented in accordance with the provisions of GB 26164.3, DL 409 and related systems.
4.3 Meteorological conditions
4.3.1 The operation should be carried out in good weather. In case of thunder, rain, snow, or heavy fog, no live work should be carried out. The wind is greater than 10m/s (5
Level), it is not suitable for operation. When the wind force is greater than 8m/s (level 4), it is not suitable to work in alternate phases.
4.3.2 When the relative humidity is greater than 80%, if live work is required, insulating tools with moisture-proof performance should be used.
4.3.3 Under special or emergency conditions, if live repairs must be carried out, the person in charge of the work shall organize the
Relevant personnel fully discuss and formulate reliable organizational, safety, and technical measures, which can only be carried out after approval.
4.3.4 If there is a sudden change in weather during live work, which may endanger the safety of people or equipment, stop work immediately.
In the case of personal safety, restore the normal condition of the equipment as soon as possible, or take other measures.
4.4 Other requirements
4.4.1 For more complex and difficult new projects and new tools developed for live work, scientific tests should be conducted to confirm safety and reliability.
Prepare safety measures and operating process plans, and use them after approval.
4.4.2 The person in charge of live work should get in touch with the on-duty control staff before starting the work, and then start the work. need
When the automatic reclosing device is disabled, the permitting procedures shall be performed. After the work is over, report to the on-duty control staff in time. It is strictly prohibited to deactivate or resume
Double reclosing.
5 Technical requirements
5.1 Maximum overvoltage multiple
For live work on 500kV AC compact lines, the minimum safety distance and minimum safety distance for live work must be determined according to the maximum overvoltage multiple during work.
The minimum effective length of the combined gap and insulation tool. The maximum overvoltage multiple can be calculated according to the system parameters, if you don’t know the exact overvoltage
Multiplier, the appropriate operating gap should be selected according to the maximum overvoltage multiple (2.18pu) that may occur in the 500kV system.
5.2 Ground potential work
5.2.1 When working at ground potential, the minimum safe distance between the ground potential operator on the tower and the charged body shall not be less than the provisions in Table 1.
Note. The values in the table do not include the space occupied by the human body, and the space occupied by the human body should not be less than 0.5m during operation.
5.2.2 The minimum effective insulation length of insulating tools and appliances should meet the requirements of Table 2.
5.3 Equipotential work
5.3.1 When the operator enters and exits the equipotential through insulated tools, the minimum combined gap distance shall not be less than the provisions in Table 3.
Note. The value in the table does not include the space occupied by the human body, and the space occupied by the human body should not be less than 0.5m during operation.
5.3.2 When the equipotential operator enters and exits the equipotential along the tensile insulator string, the insulator string shall be tested, and the tensile insulator string shall be deducted
After the human body is short-circuited and the number of bad insulators, the number of good insulators shall not be less than the regulations in Table 4.
5.3.3 The minimum safety distance between the equipotential operator and the grounding body should meet the requirements of Table 1.Minimum effective insulation length of insulation tools
The degree should meet the requirements of Table 2.
5.3.4 The minimum safety distance between equipotential operators and adjacent live objects shall meet the requirements of Table 5.
Note. The value in the table does not include the space occupied by the human body, and the space occupied by the human body should not be less than 0.5m during operation.
5.4 Operation of the double circuit line on the same tower with one circuit being charged and the other circuit being stopped
5.4.1 Operators shall not enter the cross arm on the live side or place any objects on the cross arm when working on the pole.
5.4.2 When the power outage circuit permitted by the dispatching has been changed to the maintenance state (that is, the grounding switch of the substation has been closed), but the first and end of the line are not connected
When the ground or only one end is grounded, the power failure inspection circuit should still be regarded as a live line, and the live operation method should be used for operation.
5.4.3 When both ends of the line are grounded, the power failure inspection method can be used for inspection and repair, and the operators on the wires wear a full set of shielding clothing (including.
After wearing hats, clothes, gloves, socks and shoes, the same below), directly enter and exit the insulator strings or wires of the maintenance line. Workers on the tower must wear
Wear a full set of shielding clothing or electrostatic protective clothing, conductive shoes.
5.4.4 When setting out, removing or tightening wires on the power failure circuit, measures should be taken to prevent the wires from contacting the adjacent side due to swing (jumping) or other reasons.
Live wires are approached to within a dangerous distance.
5.4.5 On the power failure circuit, the power failure inspection method is adopted to repair and replace the insulator string, etc., and the tools (double hook,
Before the lever hoist), the maintenance personnel should first hook up the personal security line. The method of hooking and disassembling the personal security line is the same as that of the maintenance grounding wire.
with.
5.4.6 The requirements and safety precautions for working on the ground wire above the power failure line are the same as when both circuits are live.
5.5 Installation of protective gaps
5.5.1 When the safe distance for live operation or the combined gap distance does not meet the requirements, the operation method of installing protective gaps should be adopted.
5.5.2 Multi-strand soft copper wire shall be used for the grounding wire connected to the protective gap, and its cross-section shall meet the requirements of grounding short-circuit capacity, but shall not be less than 25mm2.
5.5.3 When working with additional protective gaps, live working safety distance, combined gap, minimum effective length of insulating tools, and good insulation
The insulation coordination between the minimum number of sub-chips and the set value of the protection gap should meet the requirements of DL/T 876.
5.5.4 Operators in the protective clearance gap should wear a full set of shielding clothing.
5.5.5 Before installing the protective gap, contact the dispatcher to stop reclosing.
5.5.6 The protective gap should be installed on the adjacent pole tower at the working point. The ground wire of the protective gap should be reliably connected with the metal member of the pole tower, and then the
The other end is hung on the wire of the inspection phase, and it is in good contact. The procedure is reversed when removing.
5.5.7 Refer to Table 6 for the reference setting value of the protection gap. Before using the protection gap, you can select the value of the protection gap according to the actual tower head size of the project
Check calculations and corrections.
5.5.8 During installation, the distance of the protection gap should be adjusted to the maximum value first, and then adjusted to the setting value of the protection gap with an insulating tool after installation.
Before removal, adjust the protection gap distance back to the maximum value, and then remove it according to the removal procedure.
5.5.9 For upper two-phase lines arranged in an inverted triangle, the protective gap can be installed vertically between the frame and the conductor between the two hanging points of the V-shaped insulator string.
Or horizontally installed between the tower frame and the wire. The lower phase conductor can be installed horizontally between the tower frame and the conductor.
5.6 Safety protection
5.6.1 The safety protection equipment for live working on 500kV conventional lines can be used for live working on 500kV compact lines.
5.6.2 The performance of shielding clothing should meet the requirements of GB/T 6568.
5.6.3 Equipotential and intermediate potential operators should wear a full set of qualified shielding clothing, and flame-retardant underwear should also be worn in the shielding clothing.
5.6.4 The ground potential operators on the tower must wear a full set of shielding clothing or electrostatic protective clothing and conductive shoes before climbing the tower. Blocking
Wear other clothing besides clothing or static protective clothing.
5.6.5 Overhead ground wires should be regarded as live objects, and operators should keep a distance of more than 0.4m. If you need to work on an overhead ground line, you should first
Ground it well with a dedicated ground wire. The methods and procedures for installing and removing dedicated grounding wires on overhead ground wires are the same as those for installing and removing ground wires on power outage lines.
with.
5.6.6 If it is necessary to enter the overhead ground wire to carry out maintenance operations, the safety distance and mechanical strength of the operating point after the concentrated load should be checked.
5.6.7 When using insulated transmission ropes to transfer large metal objects (including tools and materials), operators on the poles or on the ground should remove the metal objects.
The product cannot be touched until it is grounded.
5.6.8 For large-volume metal objects that are insulated from the ground, such as automobiles, placed near strong electric fields, care should be taken to protect them from induced electrical damage.
Ground the metal object before touching it.
5.7 Potential transfer
5.7.1 The equipotential operator shall obtain the permission of the person in charge of the work before the potential transfer.
5.7.2 During the potential transfer of equipotential operators, the distance between the human body and the charged body should not be less than 0.4m, and it is strictly forbidden to touch with bare hands or bare parts
Charged body.
5.7.3 The action should be smooth, accurate and fast during potential transfer.
6 In and out equipotential
6.1 Equipotential in and out of linear tower
6.1.1 The operator shall not enter and exit the equipotential vertically from the cross arm or enter and exit the equipotential along the insulator string.
6.1.2 The hanging basket (chair, hanging ladder) method, the insulated soft ladder method, etc. can be used to enter and exit the equipotential.
6.1.3 Hanging baskets (chairs, hanging ladders) must be stably suspended with hanging ropes. The length of the fixed sling rope should be accurately calculated or actually measured,
The head of the equipotential operator does not exceed the equalizing ring on the conductor side.
6.1.4 The moving speed of the hanging basket (chair, hanging ladder) must be strictly controlled to be uniform and stable.
6.1.5 During the process of entering and exiting the high electric field, the equipotential operators should avoid excessive body movements.
The electrical clearance distances (including safety distances and combined clearances) of the electrical body shall meet the requirements of Chapter 5 of this standard.
6.2 Equipotential in and out of tension tower
6.2.1 Operators can use the method along the tensile insulator string or other methods to enter and exit the equipotential.
6.2.2 When equipotential operators move along the insulator string, they generally adopt the two-short-three method, and the positions of hands and feet must be consistent.
In addition, the number of insulators shorted by the human body and the tool shall meet the requirements of Chapter 5 of this standard.
6.2.3 The safety belt worn by the equipotential operator should be fastened to the hand-held insulator string and move synchronously with the equipotential operator.
6.2.4 During the process of entering and exiting the high electric field, the equipotential operators should avoid excessive body movements.
The electrical clearance distance (including safety distance, combined clearance) and the number of good insulators after being short-circuited by the human body or tools shall meet the requirements
Requirements in Chapter 5 of this standard.
7 Precautions in homework
7.1 When conducting live work on a 500kV AC compact transmission line tower, a dedicated guardian must be set up on the tower. The job site should be equipped
Dedicated communication tools ensure the smooth flow of information on and off the tower.
7.2 When the line-to-ground overvoltage is greater than 1.80pu, when equipotential operators enter and exit the equipotential through the linear tower window, additional installation must be used
Protective gap operation method.
7.3 Insulating tools should be used to transfer items between equipotential operators and those on the pole and tower structure, and the effective length of the insulating tools should be full.
Follow the requirements of Table 2.
7.4 The shielding clothing should be free of damage and holes, and all parts should be well connected and reliable. If damages and burrs are found, they should be sent to a qualified testing unit
Carry out a whole set of shielding clothing resistance, fusing current and shielding efficiency measurement, and the measurement results can be used only after the measurement results meet the requirements of GB/T 6568.
7.5 Before using the insulating tools, use a megohmmeter (2500V~5000V) for segmented testing, and measure the insulation resistance between the electrodes every 2cm
The value is not less than 700MΩ.
7.6 When using insulated tools, avoid moisture, surface damage, and dirt on the insulated tools. The insulated tools that are not in use should be placed in
On a clean, dry mat.
7.7 When the insulating tools are found to be damp, damaged or dirty, they should be dealt with in time and can only be used after passing the test.
7.8 The wire rods, fixtures and connecting tools used for live operation shall be tested and assembled to confirm that the components are flexible in operation and reliable in performance before operation.
And use it correctly in accordance with on-site operating procedures or work instructions.
7.9 The intermediate joint of the insulated operating rod shall not be detached or loosened when subjected to various loads such as impact, push-pull and torsion, and shall not be
The operating rod is used as a bearing tool.
7.10 In use, the insulated support rod must be fixed on the tower with a special fixator, and it is strictly prohibited to use the support rod to move on the basis of the human body.
wire.
7.11 When the work is suspended on the pole tower, the insulating operating rod should be hung vertically or placed flat on the horizontal tower material, and must not be dragged on the tower material to avoid damage
Bad joystick.
7.12 When using insulated operating rods on straight towers, they can be suspended with insulated ropes at appropriate positions on the front shaft to prevent excessive bending of the shaft and reduce
Light operator labor intensity.
7.13 The diameter of the clamping nozzle of the wire clamp should be compatible with the outer diameter of the wire, and it is strictly prohibited to substitute it to prevent the wire from being crushed or slipping. Closed insulation
The arcs of the two semicircles of the sub-clamp should be consistent with the shape of the insulator steel cap to avoid large stress concentration during the stress process. All double-wing cards
The tool should be consistent with the specifications of the corresponding connecting hardware, and should be equipped with a backup protection device (such as a closed bolt or a plug) to prevent it from falling off. Crossarm clamp
It must be compatible with the specifications of the tower material, and the assembly should be firm. The specification of the tightener should be determined according to the load and the way of tightening.
7.14 In the operation of replacing the linear insulator string or moving the wire, when a single suspension wire device is used, there should be backup protection to prevent the wire from falling off
Measures.
7.15 When the heavy tools and instruments are exchanged up and down, the control rope should be fastened to prevent the items being transferred from colliding with each other and accidentally being in a working state.
State-of-the-art load-bearing tools.
7.16 The insulating rope should be kept clean and dry to prevent friction with the tower material. Moisture insulation ropes are strictly prohibited to be used in live work.
7.17 When detecting insulators with power, if zero-value and low-value insulators are found, repeat the test 2 to 3 times.
7.18 Before the replaced insulator string is separated from the conductor, when disassembling or installing the first insulator close to the cross arm, special short-circuit wiring must be used.
Can be operated directly.
7.19 Equipotential operators must have backup protection when entering and exiting equipotential and equipotential operations, and intermediate potential operators during work.
8 Testing of tools
8.1 The design of live working tools should meet the requirements of GB/T 18037.Shielding clothing, insulating ropes, insulating rods, insulator clamps, etc. should be
According to GB/T 6568, GB/T 13035, GB 13398, DL/T 463, DL/T 878 and other standards, it has passed type test and factory test.
8.2 Work tools and appliances should be periodically subjected to electrical and mechanical tests in accordance with the test methods of DL/T 976.The test cycle is.
a) Electrical test. preventive test once a year, check test once a year, and the interval between the two tests is half a year.
b) Mechanical test. preventive test of insulating tools once a year, and metal tools once every two years.
8.3 The content and requirements of preventive tests are as follows.
a) Power frequency withstand voltage test. The test product is carried out as a whole, the insulation length of the test product between the electrodes is 3.7m, the withstand voltage is 580kV, and the time is 3min. To
No breakdown, no flashover and no overheating are qualified.
b) Operating impulse withstand voltage test. the insulation length of the sample between the electrodes is 3.7m, the standard operating shock wave (+250μs/2500μs), electrical
The voltage amplitude is 1050kV and can withstand 15 times. No breakdown or flashover is qualified.
c) Static load test. continuous 1 min under 1.2 times the rated working load. No permanent deformation or damage is qualified.
d) Dynamic load test. 3 actual operations under 1.0 times the rated working load. Qualified as the tool is flexible, portable, and free from jamming.
8.4 The contents and requirements of the inspection test are as follows.
a) Divide the insulating tool into several sections for power frequency withstand voltage test. Withstand voltage of 75kV per 300mm for 1min. No breakdown, no flashover
And no overheating is qualified.
b) The resistance value between the most remote points of the entire shielding garment shall not be greater than 20Ω.
9 Transportation and storage of tools and instruments
9.1 During transportation, insulating tools and instruments should be packed in special tool bags, tool boxes or special tool carts to prevent moisture and damage.
9.2 Aluminum alloy tools, fixtures and fixtures with low surface hardness, and metal tools (such as screw rods) that are not suitable for knocking, should be transported with special
The capacity of each box is limited to a set of tools, and the scattered parts should be fixed in the box.
9.3 Insulating tools and appliances should be protected from dampness, rain, exposure, etc. during transportation and maintenance. Plastic bags can be used for the inner packaging and transportation bags, and the outer packaging for transportation
Canvas bags or special leather (canvas) boxes can be used for transporting bags.
9.4 Tools and equipment for live working should be stored in a special warehouse, and the warehouse for live working tools should meet the requirements of DL/T 974.
Related standard: DL/T 401-2017    DL/T 403-2017
Related PDF sample: GB/T 36278-2018    GB/T 36050-2018