Discussion on safety management of 10kV distribution network safety management project

The safety management of 10kV distribution network has many aspects in practical work. To sum up, there are seven aspects: equipment defect and hidden danger management, personal safety management, safety label management, lightning disaster prevention, bird disaster prevention, tree obstacle prevention and high-altitude material prevention. This paper expounds them separately and puts forward effective solutions.

Keywords distribution network; Security; County level; operate

I. Management of Equipment Defects and Hidden Dangers

The fault types of 10kV distribution network mainly include natural disasters, cable digging, tree cutting, conductor breakage, burning, transformer burning, lightning arrester breakdown, metering box burning, circuit breaker burning, cable blasting, wall bushing breakdown, drainage line fault, loose conductor binding, porcelain insulator breakdown, excessive sag (high temperature in summer makes the sag of high and low voltage lines on the same tower bigger, causing tripping) and so on. It is necessary to formulate corresponding handling systems, emergency plans and standardized operations, and strengthen the investigation and handling of potential safety hazards in all aspects.

Second, personal safety management

1. The organization of on-site operation and safety technical measures are mainly formulated according to the 2009 Power Safety Work Regulations of State Grid Corporation (Line Part) and the 20 10 Distribution Network Operation Regulations of State Grid Corporation. Secondly, in view of the fact that 10kV distribution network mainly works on cement poles, the environment is mainly in the wild, the grid structure of the distribution network is complex, and the equipment models are obsolete and diverse, the corresponding information, acceptance, operation, maintenance and inspection safety systems are formulated. In particular, it is pointed out that due to the irregular construction in the past, insufficient burial depth, unreasonable setting of stay wires or no stay wires, the accident that the stay wires are pulled out on the rod leads to the fall of the rod. The third is to write a distribution network standardization operation book, formulate assessment methods, and revise them in time according to the actual situation.

Third, the safety label management

The main function of safety signs is to facilitate patrol and prevent external damage. It mainly includes laying colored bricks for cable identification, installing nearby cable routing signs, posting anti-collision signs, painting reflective paint, installing various warning signs, setting responsibility signs, painting the buried depth signs of towers, etc. In view of the damage of cables in urban areas by external forces, the installation of cable signs should require the installation of fixed warning bricks, warning piles and warning signs on the ground of buried cables or cable trenches according to road conditions and relevant identification specifications. The focus is on straight lines (1 signs, with an interval of 30 ~ 40m), bends, joints and buildings. There should be warning signs on the upper part of the pole suspended by the terminal and the cable body in the cable shaft, and indicate the name, model and related information. When there are power cables under the cement floor, the template engraved with "There are high-voltage cables under the cement floor, please contact a company for telephone construction" can be used for painting warning or roadside warning.

Fourth, the prevention and control of lightning disasters

First, the distribution line is reasonably installed with lightning conductor. The second is to use reinforced concrete poles to ensure the natural grounding of distribution lines and the indirect grounding of neutral points. The third is to install grounding protection gaps on lines in areas with high terrain and lightning damage. The fourth is to install post insulators and porcelain cross arms. Fifth, install intelligent line switch to protect tripping and have automatic reclosing function. Sixth, overhead insulated lines, installation of arc-resistant hardware with qualified quality inspection. Seventh, use the drop-type gapless metal oxide arrester. Eighth, install multifunctional lightning protection devices at the entrance of power supply.

Verb (abbreviation of verb) to prevent and control bird damage

Almost every 10kV distribution network line has bird damage. In order to prevent the bird trip on the running line, either the bird nest is removed by power failure or the live power supply is removed by fully insulated poles, which can not achieve long-term control effect. According to the commonly used bird repelling devices, it is effective to use windmill reflector to repel birds and prevent bird stings. Generally speaking, the choice of any bird protection device should ensure the durability of the material, even insulation, to prevent the increase of dangerous points and repeated power outages.

Six, tree obstacle prevention and control

The first is to establish a linkage mechanism between government and enterprises, and government documents are a favorable weapon. The effect is very good when clearing the obstacles of public greening trees. The second is to give full play to the ability of convenient communication between power supply and distribution stations and local township units. Consultation with villagers to clear tree barriers often leads to compensation problems, and village committees support, formulate standards and sign non-planting compensation contracts. Third, pruning branches, injecting herbicides and other methods are adopted to reduce capital expenditure, accelerate the natural death of tree barriers, and avoid using methods such as scraping bark to clear obstacles that are easy to attract letters and visits. At the same time, it needs the cooperation of grass-roots government organizations to carry out the work of clearing obstacles by using important power conservation events. The fourth is to establish the idea of clearing obstacles for a long time.

Seven. Prevention and control of high vacancy rate

There are three main prevention methods: one is line patrol management. Carry out safety education for tree owners along the line, prevent the line from breaking when cutting trees, and do a good job in clearing tree barriers; Pay close attention to the wall decoration of buildings along the line, and notify the owner in time if any danger is found; Carry out publicity on the protection of power facilities along the line, especially before major power conservation activities. Publicity work once a quarter. The second is insulation transformation. Insulate the areas with complex line environment and dense buildings, and appropriately increase the line diameter section. The third is the fixed value management of protection switch. According to the transformer capacity and rated high-voltage primary current of the circuit breaker, the maximum load (primary current value) of the switch can be counted, the ratio can be adjusted or the secondary value can be input, which can effectively isolate the switch fault and prevent the line branch from jumping out of the substation outlet switch by mistake.

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