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DL/T 881-2019: Technical guide for live woking in ±500kV DC transmission line
Status: Valid DL/T 881: Evolution and historical versions
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| DL/T 881-2019 | English | 189 |
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Technical guide for live woking in ±500kV DC transmission line
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DL/T 881-2019
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| DL/T 881-2004 | English | 319 |
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Technical guide for live woking in ±500kV DC transmission line
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Basic data | Standard ID | DL/T 881-2019 (DL/T881-2019) | | Description (Translated English) | Technical guide for live woking in ��500kV DC transmission line | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Classification of Chinese Standard | F20 | | Word Count Estimation | 8,841 | | Date of Issue | 2019-06-04 | | Date of Implementation | 2019-10-01 | | Older Standard (superseded by this standard) | DL/T 881-2004 | | Regulation (derived from) | Natural Resources Department Announcement No. 7 of 2019 | | Issuing agency(ies) | National Energy Administration | DL/T 881-2019: Technical guide for live woking in ±500kV DC 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.
Technical guide for live woking in ±500kV DC transmission line
ICS 29.240.20
F 20
People's Republic of China Electric Power Industry Standard
Replace DL/T 881-2004
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...2
5 Technical requirements...2
6 In and Out Equipotential...3
7 Precautions in operation...4
8 Testing of tools and instruments...5
9 Transportation and storage of tools and instruments...5
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009 "Guidelines for Standardization Part 1.Structure and Writing of Standards".
This standard is a revision of DL/T 881-2004 "Technical Guidelines for Live Working on ±500kV DC Transmission Lines", and is in line with DL/T 881-2004
The main changes compared are as follows.
--Expand the scope of application to single and double circuits ±500kV DC lines in areas below 1000m;
--Increase safety protection requirements;
-Increase the technical requirements for potential transfer, in and out of equipotential;
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 drafters of this standard. China Electric Power Research Institute Co., Ltd., State Grid Zhejiang Electric Power Co., Ltd., China Southern Power Grid
Limited Liability Company EHV Transmission Company, State Grid Hubei Electric Power Co., Ltd., State Grid Sichuan Electric Power Company Electric Power Research Institute, State Grid Security
Huizhou Electric Power Co., Ltd.
The main drafters of this standard. Liu Kai, Yuan Peng, Jiang Wendong, Peng Yong, Ma Jianguo, Zhu Ke, Zhong Wancai, Wu Chi, Yan Bo, Lei Xinglie,
Su Ziming, Tang Pan.
After the implementation of this standard, it will replace DL/T 881-2004.
This standard was first published on March 9,.2004, 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 DC transmission lines
1 Scope
This standard specifies the technical requirements for live operation of ±500kV DC transmission lines, the equipotential entry and exit, the precautions during operation and the specifications of tools
Test, transportation and storage, etc.
This standard applies to live work on ±500kV single-circuit and double-circuit DC transmission lines at an altitude of 1000m and below.
In the upper area, related parameters should be corrected for altitude.
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 document.
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/T 19185 Calculation method of safe distance for live working on AC line
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 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 on DC transmission line
On-line overhaul, maintenance and replacement of parts and other operations carried out on DC transmission lines.
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 and DC power lines, and master the basic principles and operating methods of live working
Familiar with the scope of application and methods of use of work tools. 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 practical work experience for live working on DC transmission lines with a voltage level of 500kV and above.
Work experience, 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.
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 work. Need to disable since
When restarting the device, the permit procedures should be followed. After the work is over, report to the on-duty control staff in time. It is strictly prohibited to disable or restore automatic
Restart the device.
5 Technical requirements
5.1 Ground potential work
5.1.1 The minimum electrical safety distance between the personnel working on the ground potential on the tower and the charged body shall not be less than 3.4m (the human body space should also be considered during the operation.
The gap is not less than 0.5m).
5.1.2 The effective insulation length of live working insulation tools shall not be less than 3.7m.
5.2 Equipotential work
5.2.1 The minimum electrical safety distance between the equipotential operator and the grounding body shall not be less than 3.4m (the human body should also be considered during the operation.
At 0.5m).
5.2.2 When the equipotential operator enters or exits the high potential process, the minimum combined gap between the operator and the charged body and the grounding body is not
It must be less than 3.8m (the human body space should be no less than 0.5m during operation).
5.2.3 When the equipotential operator enters the high potential along the tensile insulator string or replaces the inferior insulator in the string, the person will be deducted from the tensile insulator string
After the body is short-circuited and the number of bad insulators, the total number of good insulators shall not be less than those specified in Table 1.
5.3 The operation of the double circuit line on the same tower with one circuit being charged and the other circuit being stopped
5.3.1 When working on the pole and tower, operators must not enter the cross arm on the live side or place any objects on the cross arm.
5.3.2 When the power outage circuit permitted by the dispatcher 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.
5.3.3 When both ends of the circuit 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.
5.3.4 When setting out, removing, or tightening wires on the power-off circuit, measures should be taken to prevent the wires from interfering with the adjacent side due to swing (jumping) or other reasons.
Live wires are approached to within a dangerous distance.
5.3.5 On the power failure circuit, the power failure maintenance method is used to repair and replace the insulator string, etc., and the tools (double hook,
Before the handle pulley), 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.
5.3.6 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.
5.4 Safety protection
5.4.1 Safety protective equipment for live working on 500kV AC transmission lines can be used for live working on ±500kV DC transmission lines.
5.4.2 The performance of shielding clothing should meet the requirements of GB/T 6568.
5.4.3 Equipotential and intermediate potential operators should wear a full set of qualified shielding clothing, and flame-retardant underwear should be worn inside the shielding clothing.
5.4.4 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.
5.4.5 Overhead ground wires are regarded as live objects, and operators should keep a distance of more than 0.4m. If you need to work on the overhead ground line, you should first pass
Use a dedicated ground wire to ground it well. The method and steps for installing and removing the dedicated grounding wire on the overhead ground wire are the same as those for installing and removing the ground wire on the power outage line.
5.4.6 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.
5.4.7 When transferring large metal objects (including tools and materials) with insulated transmission ropes, the operators on the poles or on the ground should remove the metal objects.
The product cannot be touched until it is grounded.
5.4.8 For large-volume metal objects that are insulated from the ground, such as automobiles, placed near high electric fields, care should be taken to protect them from induced electrical damage.
Ground the metal object before touching it.
5.5 Potential transfer
5.5.1 The equipotential operator shall obtain the permission of the person in charge of the work before the potential transfer.
5.5.2 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 prohibited to touch with bare hands or bare parts
Charged body.
5.5.3 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 (lifting chair, hanging ladder) must be strictly controlled by an insulated pulley block 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 Operation precautions
7.1 When conducting live work on the tower, a dedicated guardian must be set up on the tower. The job site should be equipped with dedicated communication tools to ensure that the tower
Information flows under the tower.
7.2 Insulating tools should be used to transfer items between equipotential operators and those on the tower structure. The effective insulation length of the insulating tools
Should meet the requirements of Chapter 5 of this standard.
7.3 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.
7.4 Before using the insulating tool, use a megohmmeter (2500V～5000V) for segmented testing, and measure the insulation resistance between electrodes every 2cm
The value should not be less than 700MΩ.
7.5 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.
7.6 If the insulating tools are found to be damp, damaged or dirty, they should be treated in time and tested before they can be used.
7.7 The wire rods, fixtures and connection tools should be tested and assembled before operation to confirm that the components are flexible in operation and reliable in performance, and operate according to the site
Use the procedures or work instructions correctly.
7.8 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.
7.9 In use, the insulated support rod must be fixed on the tower with a special fixator, and it is strictly forbidden to use the support rod to move on the basis of the human body.
wire.
7.10 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.
7.11 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.
7.12 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.
7.13 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.
7.14 When the heavy tools and instruments are exchanged up and down, the control rope should be fastened to prevent the objects being transferred from colliding with each other and accidentally being in a working state.
State-of-the-art load-bearing tools.
7.15 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.
7.16 When detecting insulators with power, if zero-value and low-value insulators are found, repeat the test 2 to 3 times.
7.17 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.
7.18 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 DC preventive test are as follows.
a) DC withstand voltage test. using negative polarity connection, the insulation length between the electrodes is 3.2m, the withstand voltage is 565kV, and the time is 3min.
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 3.2m, the standard operating shock wave (+250μs/2500μs), electrical
The voltage amplitude is 970kV and can withstand 15 times. No breakdown, no flashover, and no overheating are 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.
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