How to prevent transmission lines from being damaged by external forces

Prevent theft and vandalism:

(1) Establish a working mechanism for the police and enterprises to jointly combat theft, and actively cooperate with local public security agencies and judicial departments to severely crack down on sabotage, theft, and acquisition of power transmission Illegal and criminal activities on line equipment. Timely and powerful police efforts will be organized to detect cases of major theft and damage to transmission lines.

(2) Work with local public security and industrial and commercial departments to strengthen the inspection and management of waste material purchase sites, strictly monitor the purchase points of power equipment, and block the channels for selling stolen goods from the source.

(3) Improve and perfect the line protection network, actively mobilize the people along the transmission lines to participate in the campaign against theft of transmission lines, vigorously promote the localized management of channels, and timely detect and prevent theft incidents. Appropriate rewards will be given to those who discover and report theft or damage to transmission lines to stimulate the enthusiasm of the masses and create a good social atmosphere.

(4) During important power supply periods and important festivals such as the Spring Festival and National Day, designated personnel must be assigned to continuously guard important lines and sections, shorten the frequency of inspections, and prevent theft and man-made damage. Deliberate sabotage leads to serious consequences; it can be carried out in conjunction with daily inspections of ordinary lines during normal periods, usually at least once a month.

(5) For important transmission lines, anti-theft measures such as installing anti-theft nuts, anti-theft cutting sheaths, and anti-theft alarm devices should be adopted for their tower materials and cables (rods). Videos can be installed in areas (sections) prone to theft. Monitoring system.

(6) Combined with line inspections, supplement and improve safety warning signs to prevent theft and vandalism in special sections of transmission lines.

(7) When the line operation inspection unit discovers that the line has been stolen or deliberately damaged, which directly threatens the safe operation of the line, and a critical situation such as failure or outage may occur at any time, it shall immediately report to the superior organization for emergency repair, and at the same time call the police and report Insurance, start the external breach incident handling process, and cooperate with the public security organs to complete case detection and insurance claims settlement.

Prevent construction (machinery) damage:

(1) For line sections where vehicles and machinery frequently approach the outer edge of the tower foundation within 15 meters, add connecting beam reinforcement measures to the tower foundation. It is equipped with auxiliary measures such as brick sand-filled piers, energy-dissipating anti-collision buckets, rubber retainers, and walls to mitigate the impact. For cables that are susceptible to impact, take anti-collision measures and set up eye-catching warning signs.

(2) Promote the use of protective piles and elevated ceilings (nets) for fixed construction sites, such as bridges, road construction, railways, highways and other construction sites that are constructed in protective zones or may endanger the safety of transmission lines. , limit facilities, video surveillance, laser alarm devices, and actively try out new protective devices

(3) For mobile (mobile) construction sites, such as road tree planting, seedling planting and greening, temporary hoisting, logistics, warehousing, Safety protection measures such as temporarily placing warning signs or flags, laying warning tapes, and installing warning guardrails in the protective area can be adopted in places such as soil extraction and sand excavation.

(4) When installing height-limiting devices, consult with the traffic management department and install height-limiting devices before and after the intersections of roads and transmission lines. Generally, they adopt a portal frame structure and place them in a conspicuous position on the height-limiting fence. Indicate the height limit to prevent over-height vehicles from colliding with the line; or install a temporary height-limiting device at the fixed construction operation point line protection area to prevent cranes or cement pump truck arms from entering the line protection area

(5) When conditions permit, a near-electricity alarm device can be installed on the wire or on the top of the boom of a crane or other vehicle to set a safe distance from the high-voltage line in advance. When the top of a crane or other vehicle is close to the high-voltage line, the sound and light alarm will be activated immediately. , prompting operators to stop operations immediately

(6) In large construction sites, video online monitoring devices can be installed in areas with frequent occurrences such as mobile operations and tree planting. Through personnel monitoring, we can promptly understand the occurrence of accidents in the line protection zone. Mobile operations or other behaviors that affect the safe operation of the line. At the same time, after an external force damage failure occurs, the vehicle or responsible person can be found by checking the surveillance video

(7) For the construction operations adjacent to the overhead power line protection zone, additional barriers, barriers, fences, Protective nets, etc. are installed for protection and isolation, and eye-catching warning signs are hung.

(8) Establish a full-time line protection team to prevent external damage to transmission lines, and strengthen line inspections and publicity. Generally, the period from May to November is the intensive period of construction. Channel inspections in key sections should be conducted no less than once a day, and line guards should conduct inspections no less than twice a day. Regularly proactively contact the construction unit to understand the progress of the project, and conduct on-site stationing and night patrols when necessary

(9) Negotiate with relevant government functional departments such as the Quality and Technical Supervision Bureau, and conduct annual inspections of large machinery and operators During the training and examination, the content of preventing transmission lines from being damaged by external forces will be included in the examination scope. Targeted training on the protection of transmission lines for sand mining companies and sand mining ships will be carried out, and conditionally included in the annual sand mining certificate annual review training, to improve the awareness of relevant practitioners in protecting transmission lines.

(10) Standardize the administrative approval system for electric power regulations and establish a communication mechanism. By actively contacting relevant local government departments, visiting construction management departments, holding on-site meetings, etc., we can understand the planning and construction status of various municipal, greening, road construction and other projects in advance, and take preventive measures as early as possible.

(11) Establish and improve the government-enterprise linkage mechanism, and comprehensively eliminate hidden dangers through effective means such as safety notification, signing of agreements, suspension of power supply, economic penalties, joint law enforcement, and listing supervision for hidden danger units. Governance.

(12) For line poles and towers with poor operating environment and poor distance between conductors and the ground (river), the poles and towers should be heightened and replaced through targeted technical transformation to improve line operation standards and eliminate potential safety hazards.

Prevent short-circuit damage by foreign objects

(1) For temporary buildings such as colored steel tiles near the power facility protection zone, the operation and maintenance unit should require the manager or owner to dismantle or Reinforcement. Reinforcement methods such as installing windproof cables and connecting angle steel to the ground foundation can be used.

(2) For garbage dumps and waste recycling sites that endanger the safe operation of transmission lines, the line transportation inspection unit requires the unit or individual responsible for the hidden danger to make rectifications, and those that may cause hidden dangers of floating objects, such as advertising cloths, plastic Effective fixing measures should be taken for sunshade cloth (film) plastic, tin foil, balloons, domestic garbage, etc. If necessary, request government departments to coordinate and handle

(3) The vertical distance between the top of the solar greenhouse and plastic greenhouse and the wires in the overhead transmission line protection zone, under the maximum calculated sag condition, complies with the relevant design and operation The requirements of the specification will be dismantled if they do not meet the requirements.

(4) Request the agriculture and forestry departments (township governments and village committees, etc.) to strengthen the publicity of knowledge on the use of greenhouses, greenhouses, and mulch films, guide farmers to build strong and qualified plastic greenhouses, and urge farmers to promptly recycle and clean up used greenhouse films. , shall not be piled randomly in the fields or fields near the line passages, and shall not be burned near the line passages.

(5) For solar greenhouses and plastic greenhouses within 100 meters on each side of the overhead transmission line protection zone, require the property owner or manager to take reinforcement measures. Before the summer typhoon comes, the line transportation inspection unit urges greenhouse owners or managers to take reliable reinforcement measures and strengthen line inspections to prevent film from blowing up and harming transmission lines.

(6) Line transportation inspection unit is inspecting the line During the process, we cooperated with the agriculture and forestry departments to carry out publicity and education on the prevention and control of mulch pollution, promoted the use of liquid mulch, and raised farmers' awareness of the hazards of mulch pollution. Farmers are required to clean up and transport the recycled residual films in a timely manner to prevent the plastic films from being blown up by the wind and endangering the safe operation of transmission lines.

(7) Based on the danger sources such as garbage dumps, planting greenhouses, color steel tile sheds, and waste recycling stations around the line protection areas, set up relevant warning signs to prevent foreign objects from short-circuiting around the line channels, and issue warning signs to prevent foreign objects from short-circuiting. The promotional materials provide timely reminders to protect transmission lines.

(8) Strengthen the inspection of circuits to prevent foreign objects from short-circuiting, and take the following measures for different types of foreign objects:

a. Aim at preventing short-circuit caused by floating objects such as tin foil paper and plastic film Section, spring and autumn are the key periods for inspections. Passage inspections are conducted no less than twice a week, and line guards conduct inspections no less than once a day. Dangerous behaviors around the passages are discovered and stopped in a timely manner, and dangerous behaviors that directly threaten safe operation are Dangerous items must be cleared immediately.

b. In terms of preventing kites from hanging on strings, March-May and September-October are generally the key periods for inspections, and the passages in key sections should be inspected no less than twice a week. Line protectors will conduct inspections at least twice a day to detect and stop kite flying around the passage in a timely manner.

c. Inspection of hidden dangers in temporary buildings such as colored steel tiles, garbage dumps, and waste recycling sites near passages. Passage inspections in key sections should be conducted at least once a week, and line guards should conduct inspections every week. Conduct inspections no less than 3 times. Issue hidden danger notices to units or individuals responsible for hidden dangers every month, requiring dismantling or reinforcement. Units and individuals that fail to deal with the requirements will be reported to the safety supervision department for coordination and processing in a timely manner.

Prevent tree and bamboo discharge damage

(1) Increase efforts to manage hidden dangers of tree line conflicts in transmission line protection areas, and promptly clean up and prune those that affect line safety in line protection areas. Tree barriers should be used to strengthen the management of potential safety hazards caused by trees outside the protected area whose height is greater than the horizontal distance between them and the lines. For hidden dangers in trees and bamboos that directly affect safe operation, immediately inform the tree owners of the serious situation and related responsibilities, require them to cut down or prune branches immediately and supervise the treatment; for general hidden dangers, issue a hidden danger notification letter to clarify the handling opinions and make corrections within a time limit, and urge them to make rectifications within a time limit. Before transplanting or felling, strengthen inspections before processing

(2) The line transportation inspection unit shall notify the gardening departments at all levels and the corresponding management departments in writing before the end of November each year of the branch pruning work arrangements and related matters requirements ( Such as highway management units, property owners, etc.) and owners, and actively cooperate with the pruning work. Units and individuals who fail to prune tree branches as required shall promptly report to the government power administration department or relevant government departments.

(3) Establish accounts of forests, bamboo areas, seedling planting bases, large green areas, etc. involved in transmission line protection areas and communication records of the main persons in charge; set up relevant prevention trees around line channels based on the accounts Safety warning signs for bamboo felling and discharge.

(4) The line transportation inspection unit shall investigate and establish file details of ultra-high trees outside the transmission line protection zone, indicating tree species, tree height, horizontal distance from the line, location, etc., identify responsible persons, and strengthen inspections. On this basis, warning signs are installed on each tree to remind the tree management unit to control the height of the tree during normal tree maintenance and pay attention to the safety of itself and surrounding lines. At the same time, it warns tree felling personnel that cutting down ultra-high trees can easily cause line failures. or casualties, causing them to proactively contact the power supply company

(5) Generally, the spring afforestation period from March to May and the heavy load period in summer from July to August are the periods prone to tree line discharge, and targeted inspections should be formulated According to the plan, corridors in key sections will be patrolled no less than twice a week, and line guards will patrol no less than once a day. Pay close attention to offline illegal tree planting from March to May, focusing on new tree planting on farmland and roads near protected areas, and stop them as soon as possible; during the heavy load period in summer in July and August, increase the frequency of patrols for hidden tree hazards.

(6) Strengthen contact and communication with relevant government functional departments, promptly report major safety hazards caused by the growth of trees and bamboos, seek support from governments at all levels, and deal with various trees and bamboos that affect the safe operation of transmission lines in accordance with the law. Hidden danger.

(7) Establish a long-term liaison mechanism with the local forestry department, municipal gardening units, greening construction and maintenance units, hold relevant greening work meetings regularly, and publicize the transmission lines and the greening trees (bamboo) in the areas they pass through. ) existing safety hazards, remind relevant units to do a good job in protecting transmission lines.

(8) Urge local governments to include power channel and reserved channel planning into urban greening planning. ?Try to plan the transmission line channels in open areas as much as possible, and ensure that the final height of the natural growth of trees and the distance between overhead lines meets the safety distance requirements for the green belts of roads under the lines.

(9) Strictly carry out pruning of trees and bamboos in accordance with the "State Grid Corporation of China's Electric Power Safety Work Procedures", and take appropriate safety measures to ensure that line faults and tripping due to falling, bouncing, etc. of trees and bamboos do not occur.

Prevent damage caused by fishing lines

(1) Strengthen inspections of key locations, and line transportation inspection units and local power supply companies should implement status inspections. Fishing under the defense line is generally from May to October as the key period. Inspections of rivers and fish ponds around the line are strengthened. Key sections are inspected at least twice a week, and line guards are inspected at least once a day. Timely detect and stop offline fishing activities.

(2) Request the safety supervision and industrial and commercial departments to require fishing equipment stores to paste warning slogans on fishing rods, and send promotional materials through fishing equipment stores and fishing associations.

(3) The line transportation inspection unit signs a safety agreement with the fish pond owners, strengthens safety education, informs the hazards of fishing under transmission lines and related legal responsibilities, urges fish pond owners to strengthen management, *** In order to prevent the occurrence of fishing electrocution accidents,

(4) The line transportation inspection unit shall set up safety warning signs on the shore of fish ponds near the overhead transmission line protection zone in accordance with regulations. For towns and villages with large areas of fish ponds or numerous fish ponds and complex environments, additional warning signs can be set up at village heads, intersections and other necessary places to improve the warning effect.

(5) Regularly measure lines The clearance distance to the ground should be improved in a timely manner on lines with insufficient crossing distance or small safety margin.

Prevent fire damage

(1) Divide the key periods for mountain fire prevention according to local customs and climate characteristics. High mountain fire periods mainly include the Spring Festival, spring plowing, and ancestor worship (Qingming and Mid-Autumn Festival). Yuan, winter solstice, etc.), straw burning (summer harvest, autumn harvest), other special periods (festival celebrations prone to mountain fires, continuous sunny, hot and dry weather, etc.). For key sections, channel inspections will be conducted at least once a day during key periods, and line protectors will conduct uninterrupted inspections every day. For important transmission channels, dedicated personnel will be stationed 24 hours a day.

(2) Combined with line inspections, investigate and count various fire hazards that may cause transmission line failures in and around the protected area, sign safety agreements and establish files with relevant management departments, units and individuals.

(3) Issue a "Safety Hazard Notification" to relevant management departments, units and individuals regarding forest farms, buildings, structures and illegal stacking of flammable and explosive materials that have fire hazards in and around the protected area. "Book", clarifying the rectification requirements and eliminating safety hazards within a time limit.

(4) Strengthen inspections of hidden dangers that have been issued rectification notices, and urge relevant units and individuals to make rectifications within a time limit until the hidden dangers are eliminated; for units and individuals that have major fire hazards but refuse to rectify, the joint government power The facility management department will stop power supply and impose penalties in accordance with the law. (5) During special seasons and periods such as strong winds in spring, high temperatures in summer, and "Qingming Festival" sacrifices, carry out special fire prevention patrols at key locations such as forest farms, garbage dumps, waste collection stations, lumber mills, and villages around targeted lines to check wind protection Implementation of fire prevention measures.

(6) Strengthen the operation, maintenance and management of transmission line channels. Trees and weeds around towers and line corridors must be cleared, and trees that do not meet regulatory requirements in line corridors must be cut down resolutely.

(7) Comprehensively clean up the flammable and explosive items piled up in the line protection area, and educate residents who often pile up haystacks, grains, sugar cane leaves, etc. under the lines about the harm of fires to lines and the serious consequences caused by fires. consequences and require relocation.

(8) The occurrence of wildfires is greatly affected by the custom of fire use in wild industry and agriculture. Transmission lines span mountainous woodlands, shrubs, thorns, farmland, etc., posing serious wildfire risks. The prevention of wildfires focuses on six technical measures of "avoidance, resistance, modification, planting, cleaning and renewal".

1) "Avoid": Transportation inspection departments and line transportation inspection units at all levels participate in the feasibility study review and path selection of new lines, and urge lines to avoid areas with large forests, bamboo forests, and areas with multiple graves as much as possible Implement measures to avoid wildfire hazards in areas prone to wildfires, such as densely populated areas and areas with habitual agricultural burning.

2) "Resistance": Transportation inspection departments and line transportation inspection units at all levels participate in the preliminary design review and project acceptance of new lines, supervise the implementation of high-span design to prevent wildfires, and improve the clearing of trees and bamboos in important transmission channels standards to enhance the line’s ability to withstand wildfires.

3) "Reform": The line operation and inspection unit shall carry out line hazard inspection based on operating experience, and hardening should be adopted for line sections that fail to meet mountain fire prevention requirements, such as hidden danger points near conductors (see Technical transformation will be carried out through measures such as lowering the foundation (see Figure 2 below), raising the tower and changing the route.

4) "Planting": For line sections that pass through fast-growing forest areas, the line transportation inspection unit consults with the local forestry department or household owners to take measures such as forest land subletting and vegetation replacement to plant fire prevention plants on the outside of the line passage. tree species to form a biological fire prevention isolation zone. If necessary, build isolation walls or synchronize with the forestry department to cut down the mountain fire prevention isolation zone. Replace flammable, fast-growing plants with low-growing, non-flammable cash crops in line protection areas.

5) "Cleaning": The transportation inspection department formulates differentiated channel cleaning standards based on the line topography, vegetation types and related technical requirements and the importance of the line, and implements financial investment. Carry out investigation of hidden dangers in passages according to passage cleaning standards, and establish files on key sections and prevention and control measures for preventing wildfires.

a. Capital investment: Transportation inspection departments at all levels and line transportation inspection units must ensure funding for channel cleaning, prioritize channel cleaning as an overhaul and technical renovation project, and raise funds independently when there is a gap in channel cleaning costs. Ensure that channel cleaning is implemented, see Figure 5-26.

b. Personnel investment: The line operation and inspection units clean up on their own, and local power supply companies, outsourced enterprises, line protectors and information personnel are entrusted to clean up the passages to ensure full investment in personnel.

c. Tree and bamboo felling: The line transportation inspection unit establishes tree and bamboo cutting standards, promptly cuts and transports trees and bamboos away from the channel site to ensure the cutting effect,

d. Clearing of shrubs and thatch : The line transportation inspection unit strictly implements the channel cleaning standards and promptly cleans up the shrubs and thatch in the channel, as shown in the figure below. During special sunny and hot periods, the number of mountain fire clearances should be appropriately increased.

e. Set up a separation wall: The line transportation inspection unit cleans the moso bamboo area under the transmission line and builds a separation wall. New bamboo shoots in the separation wall are promptly cleaned every spring to prevent the continuous growth of moso bamboo.

f. Set up isolation zones to prevent wildfires: cut down isolation zones to prevent wildfires when necessary, actively seek government support when cutting down isolation zones, and cut down the isolation zones simultaneously with forest fire protection zones,

6) "New": Transportation inspection departments and line transportation inspection units at all levels explore and promote the application of new technologies such as wildfire monitoring and new fire-fighting equipment.

a. Video surveillance: Install mountain fire video monitoring devices in areas prone to mountain fires. Computer terminals can be used to observe monitoring images in real time. When a suspected mountain fire occurs, the system will automatically alarm and remind line maintenance personnel to take precautions. , see picture below.

b. Artificial rainfall: During periods and areas with high incidence of mountain fires, artificial rainfall intervention is used to increase vegetation humidity to prevent the occurrence of mountain fires; or after mountain fires occur, artificial rainfall intervention is used to extinguish mountain fires.

c. Fire prevention lookout posts: Establish wildfire prevention lookout posts in areas with high incidence of mountain fires, and use manual surveillance to monitor mountain fires. If a mountain fire is discovered, line maintenance personnel will be notified as soon as possible to take relevant measures. emergency measures.

d. Extinguishment of initial mountain fires: During high-incidence periods and in high-incidence areas, the work of extinguishing initial mountain fires should be carried out while ensuring safety, and the allocation of anti-mountain fire equipment should be reasonably arranged and deployed uniformly. In provinces prone to wildfires, important power transmission channels should be equipped with no less than 1 set of large wildfire prevention equipment every 100 kilometers, and the operation and maintenance teams responsible for high and medium wildfire risk sections should be equipped with no less than 3 sets of small wildfire prevention equipment. equipment. Inter-regional lines are configured as needed based on the historical fire density of the line corridor, line importance and historical wildfire tripping conditions.

(9) Establish and improve emergency plans to ensure that personnel, vehicles, and equipment are in place. Strengthen contact with the fire protection, public security, and forestry departments. When a mountain fire occurs, immediately take the initiative to contact the local government, police, and fire brigade, and organize and put out the fire in a timely manner.

(10) Prevent wildfires through systematic prediction, monitoring and early warning.

1) Mountain fire prediction work means that the monitoring and early warning center carries out medium and short-term mountain fire predictions and issues reports during periods of high mountain fire incidence. The mid-term wildfire forecast refers to the prediction of the possibility (probability) of wildfires near the line in the next 7 days; the short-term wildfire forecast refers to the prediction of the possibility (probability) of wildfires near the line in the next 3 days.

2) Wildfire monitoring work refers to the monitoring and early warning center carrying out wildfire satellite monitoring duty, satellite data reception, hot spot data analysis and identification, etc. The monitoring and early warning center conducts satellite monitoring of wildfires every day, and is on duty 24 hours a day during peak wildfire periods. The duty officer conducts real-time monitoring of wildfires on the State Grid's transmission lines in provinces with high mountainfire incidence through the transmission line wildfire satellite monitoring system; the provincial equipment status evaluation center carries out corresponding duty work through the client access terminal or the provincial wildfire monitoring substation system; monitoring and early warning The center performs alarm calculations on fire points monitored in real time by the satellite monitoring system, and issues alarm information about the fire points to the line to the provincial equipment status evaluation center or line operation and maintenance personnel via phone calls or text messages.

a. Level 1 alarm: The distance between the wildfire hotspot and the line is less than or equal to 500 meters.

b. Level 2 alarm: The distance between the wildfire hotspot and the line is greater than 500 meters and less than or equal to 1,000 meters.

c. Level 3 alert: The distance between the wildfire hotspot and the line is greater than 1,000 meters and less than or equal to 3,000 meters.

d. No alarm: The distance between the wildfire hotspot and the line is greater than 3,000 meters.

3) Wildfire early warning work includes mountain fire early warning level determination, medium and short-term wildfire forecasts, wildfire early warning recommendations and power grid early warning issuance. The Monitoring and Early Warning Center regularly carries out medium and short-term wildfire forecasts during periods of high wildfire incidence, compiles medium- and short-term wildfire forecast conclusions and wildfire early warning recommendations for State Grid's cross-regional power grids and provincial lines, and reports them to the State Grid Operations and Inspection Department and the provincial company operations and maintenance The Maintenance Department and the Provincial Company issue power grid wildfire warnings based on wildfire monitoring and early warning recommendations and comprehensive on-site wildfire feedback. The transportation and inspection unit takes corresponding disposal measures in a timely manner based on the wildfire early warning and the actual situation of on-site wildfires.

a. Early warning level: The early warning level from high to low is: red, orange, yellow, blue.

b. Red warning: The number of mountain fire hot spots monitored in a certain province on that day is greater than or equal to 300.

c. Orange Alert: The number of mountain fire hot spots monitored in a certain province on that day is greater than or equal to 200 and less than 300.

d. Yellow warning: The number of mountain fire hot spots monitored in a certain province on that day is greater than or equal to 100 and less than 200.

e. Blue warning: The number of mountain fire hot spots monitored in a certain province on that day is greater than or equal to 50 and less than 100.

f. No early warning: The number of mountain fire hot spots monitored in a certain province on that day was less than 50.

Prevent chemical corrosion damage

(1) The line transportation inspection unit shall establish files on key poles and towers to prevent chemical corrosion, strengthen the publicity of line protection, and set up warning signs on the main body or surrounding areas of key prevention poles. , prohibiting any unit or individual from dumping chemical reagents and various wastes around the tower.

(2) Shorten the inspection period for key areas with chemical corrosion, and timely grasp the corrosion conditions of line body components to provide a basis for further measures.

(3) The anti-corrosion work of metal parts of pole towers must be carried out according to regulations and the process must be strictly controlled. The iron parts of the poles and towers are hot-dip galvanized for anti-corrosion, or other equivalent anti-corrosion measures are adopted. Other effective additional anti-corrosion measures are also taken for the wire rods in areas with severe corrosion. For the underground metal inspection of the pole towers included in the key sections for prevention, an inspection is conducted every year. Excavation inspections are carried out, and image data are retained. For towers whose development trends affect the long-term safe and stable operation of the line, technical means such as foundation reinforcement and tower material replacement are promptly dealt with.

(4) In order to prevent corrosion of the grounding grid, galvanized round steel, flat steel or alloy grounding body should be used to improve the anti-corrosion performance during the transformation of the grounding grid. Apply anti-rust paint to the welding points of the grounding body, and apply asphalt paint to the ground where the grounding body enters the soil.

(5) When the line operation inspection unit finds signs of corrosion of the tower foundation and tower materials due to man-made factors such as dumping of acid, alkali and salt around the tower, it should immediately find the source of the corroded material and report it to the superior management department and environmental protection department in a timely manner department to prevent the scope of hidden dangers from expanding.

Prevent illegal soil taking (pile) damage

1) For the identified sections of routes where illegal soil taking (pile) occurs frequently, emergency section passage inspections should be carried out no less than 2 times a week times, and the line protector will conduct inspections no less than once a day. When necessary, set up fences, cement piles, etc. to prevent construction vehicles from entering

2) Immediately stop illegal earth-removing (piling) construction operations that directly threaten the safe operation of the line and may lead to critical situations such as line failure at any time; For controllable construction activities, sign safety agreements and strengthen supervision and inspection.

(3) Install video and image online monitoring devices on the poles and towers in the section where illegal soil taking (piling) is common, so as to promptly discover the phenomenon of illegal soil taking (piling) in the line protection area. At the same time, it can be viewed through Monitor pictures and videos to find information on the parties responsible for causing hidden dangers.

(4) For foreseeable government infrastructure projects (such as roads, bridges, subway construction, etc.), which may lead to the removal (pile) of soil around the foundations of line poles and towers, the line transportation inspection unit actively communicates with government departments , intervene in the safety management of construction operations in advance, and sign relevant "safety construction agreements" with them. For projects that are determined to require line relocation, the construction unit can only be allowed to operate after the line relocation is completed, and inspections of key sections should be strengthened before completion. .

(5) For hidden dangers due to the illegal taking (piling) of soil around the tower foundation and in the protected area, which has affected the stability of the transmission line tower foundation or the live conductors do not meet the safety distance requirements, the line transportation inspection unit shall instruct the construction In this regard, hidden dangers have been completely eliminated through technical means such as reinforcing tower foundations and removing piles of materials in protected areas. ?

Prevent damage from blasting operations

(1) It is strictly prohibited to conduct blasting operations within 500 meters of the horizontal distance of overhead transmission lines. If blasting operations must be carried out due to work needs, the operating unit is required to follow Relevant national laws and regulations, take reliable safety precautions, obtain written consent from the facility management unit, and submit to the relevant government management departments for approval.

(2) Actively build a government-enterprise cooperation mechanism. Where local governments have introduced construction licensing systems (methods) for transmission line protected areas, the government is urged to include blasting operations in the licensing content.

(3) Strengthen contact with the construction unit and blasting construction unit, understand the construction plan, construction scope, progress requirements, etc., and formulate countermeasures in advance.

(4) Carry out special inspections of blasting operation points in the line protection zone, carry out on-site construction safety checks, establish files of hidden danger information points, formulate various emergency plans, and report on-site conditions to dispatch to do a good job Line load transfer plan to enhance line operation management and control capabilities.

(5) When potential safety hazards in blasting operations are discovered, the line transportation inspection unit promptly delivers a written notice of rectification of the hidden dangers. For those who do not listen to dissuasion and do not take safety measures to carry out blasting operations, a copy of the operation conditions will be reported to the relevant government departments and the government will request administrative measures to stop it.

(6) The facility management unit shall clean up the construction and blasting operation points that may affect the transmission lines within its jurisdiction, establish a ledger, strengthen monitoring, and assign responsibility to each person. Carry out regular inspections and inspections of blasting construction sites, install online video monitoring devices in key blasting construction areas, or send personnel to station to implement real-time monitoring.

(7) When blasting operations are carried out within 500 meters of transmission lines, the construction unit is urged to take the following on-site prevention and control measures:

1) The blasting construction unit shall take precautions before starting the blasting operation. , it is necessary to provide safety education to all construction personnel, especially those related to blasting operations, to understand the situation of transmission lines near blasting operations, and to master the protective measures for transmission lines during blasting operations.

2) The blasting construction unit must arrange dedicated personnel to manage the blasting site. Before the start of the blasting day, the rubber, iron plates, etc. used to cover the blastholes during blasting must be placed at the construction site. Before starting blasting, the administrator must check the number of blasts, the coverage of blastholes and the implementation of other safety measures. Blasting construction can only be carried out when there are no safety hazards.

3) Blasting and excavation construction is prohibited in line protection areas such as poles, iron towers, cables, etc. Blasting in protection areas close to lines must follow the "Micro-Difference Controlled Blasting Technology" and adopt shallow holes and less chemical loosening blasting measures. .

4) When blasting in the area where the conductor extends horizontally 10 meters below the conductor, shallow holes and loose blasting measures with less explosives must be adopted. No more than 4 shots should be fired at a time. A test shot should be carried out before blasting. , blasting can only be carried out after ensuring that it does not pose a threat to the safety of high-voltage lines.

5) When blasting in an area within 50 meters and 10 meters away from the side conductor, the number of shots fired per time can be appropriately relaxed while covering, but it is prohibited to fire shots over a large area at one time.

6) During blasting operations, the depth of the blasthole and the amount of explosive charge must be constructed in strict accordance with the requirements. It is prohibited to install detonators first and then explosives.

7) During blasting operations, rubber and iron plates must be used to effectively cover the blastholes and gun wires before blasting construction can be carried out to prevent flying rocks and gun wires from damaging the transmission lines.

8) After the blasting operation, promptly collect the abandoned gun wires at the site and check whether there are gun wires hanging on the wires. If any problems are found, report them to the power supply company immediately.

Prevent hidden dangers and damage in goaf areas (coal mine subsidence areas)

(1) Strengthen the investigation of hidden dangers in goaf and subsidence sections of lines, establish a hidden danger ledger, and grasp the direction of mine tunnels and their directions If lines intersect or are adjacent, special inspections must be strengthened. Abnormalities in tower equipment must be paid close attention to. If abnormal deviations such as ground wire clamps are discovered, the cause must be found promptly. Install warning signs near areas where mining may occur.

(2) When selecting sites for transmission lines, the planning department should try to avoid the goaf (subsidence area). It is indeed difficult to avoid it. It is necessary to carefully understand the scope of the underground goaf and master the depth and depth of coal mines. Basic parameters such as mining thickness and proportion, the mining company's mining plan and progress, and reasonable selection of relatively safe and reliable locations.

(3) When the transmission line passes through the goaf area, avoid using isolated gears, especially those with small gear spacing. Reduce the number of corner towers used as much as possible, avoid using large corners, and shorten the length of the tension section as much as possible. It is advisable to use a self-standing tower with a small root opening, and it is not suitable to choose a tower with guy wires. Transmission lines passing through coal mines with a thickness ratio less than 100 should not use double (multiple) circuit lines on the same tower.

(4) The line transportation inspection unit should strengthen communication with the Coal Bureau and the Land and Resources Bureau, and strive to enable coal mines, mines and other underground mining companies to inspect all transmission lines and towers within their mining areas. , position and arrange it on the mining project plan. To grasp the coal mining plan and dynamic situation, it is necessary to establish a normal communication mechanism with various coal mines and mining enterprises, timely grasp the actual situation of transmission lines in the goaf, coal pressing area, and mining area, establish a goaf area ledger, and incorporate it into daily operation and maintenance manage.

(5) For transmission lines located in goaf areas, relevant agreements must be signed with coal mines, mining and other enterprises, and relevant enterprises must be required to promptly report mining plans and mining information to the line operation and inspection unit to ensure that line operation Inspection units can take preventive measures in advance to prevent emergencies such as pole inversion and disconnection in transmission lines. At the same time, we must actively create conditions for relocation, obtain support from local planning, and include it within the scope of local planning.

(6) The line operation inspection unit should strengthen the dynamic monitoring of facilities in the goaf area, and strengthen the monitoring of poles and towers in the goaf and planned mining areas through online monitoring devices and manual measurements. , and keep detailed records. Special patrols should be arranged after the temperature rises in spring and after rains in summer to keep abreast of changes in geology, environment, poles and towers in the mining area.

(7) If the inclination of the tower in the goaf area is within the allowable range of the regulations, emergency measures such as releasing the tension of the ground conductor, laying four-way guy wires to control the inclination of the tower, sinking the foundation and adding pads, and reinforcing it can be taken measure. When the inclination of the tower in the goaf exceeds the maximum allowable value in the regulations, measures should be taken to replace the adjustable tower foot plates and adjust the inclination of the tower in a timely manner. At the same time, based on on-site monitoring data and on-site collapse development and changes, when the tower tilt intensifies and worsens, the operating mode must be changed in a timely manner and technical modifications must be considered.

(8) If there are collapses, landslides, etc. in the equipment section, the site should be relocated immediately. The transmission lines can be rerouted or underground cables can be used.

(9) The line operation and inspection unit adjusts the status inspection cycle for line sections that may be critical to the safe and stable operation of poles and towers located in the goaf area due to external conditions. When line poles and towers located in the goaf encounter the following situations , a special patrol should be organized immediately