Distribution line fault causes and solutions - Database & Sql Blog Articles

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1 Introduction The problem of distribution line failure will not only bring economic losses to the power supply enterprises, but also bring inconvenience to the daily life of urban and rural residents. Therefore, it is very important to manage the distribution lines. As a difficult problem to solve distribution line faults, we can only find a solution if we analyze the causes.
2 Analysis of common failure causes of distribution lines
2.1 Natural causes of distribution line trips together
2.1.1 Faults caused by lightning, the annual summer is the season of thunderstorms, the distribution lines are in an open environment, and the lines and power distribution equipment are vulnerable to lightning strikes. If lightning protection measures are not available, it will be because Lightning strikes cause a disconnection. In addition, due to the windy weather in the spring and summer, some light weight objects are easily scraped on the wires with the wind, causing the distribution line to malfunction.
2.1.2 Birds are caused by bird breeding and tree growth. Every spring, there are small birds on the line, and the bird's nest is placed on the wire. Generally, after the rain, the branches of the bird's nest are wet, which is easy to cause short circuit. Tripped. As the number of trees increases, the luxuriant jihad occupies the passage of the wires. In the rainy and windy weather, the insulation capacity of the trees decreases. When the branches touch the branches, they will directly cause the short circuit to trip.
2.2 Equipment faults on the line caused by line trips are common: (1) Failure caused by porcelain bottle bursting. After the line porcelain bottle bursts, it is not easy to be found. After the rain, the insulation is reduced, which may cause the grounding or tripping of the line, or the flashing of the fog and discharge, causing the trip. (2) Failure caused by high pressure metering device. The distance between the terminals of the high-voltage metering device is too small, and no insulation protection measures are taken. Falling or hanging foreign objects may cause the line to trip. (3) A fault caused by over-blowing. If the lead wire connection is not strong, the connection point is likely to cause heat when the line load is large, and the wire is blown by the fire to cause the trip.
2.3 Equipment faults in the power distribution room are common to the line trip: small animals such as rats and cats climb to the switchboard or low voltage bus to cause short circuit of the equipment, causing line faults; lightning arresters break down after lightning, causing line faults; drop switches, low voltage capacitors Aging burns out, causing line failure.
3 Improve distribution network management methods and reduce distribution line failures
3.1 Formulate relevant assessment system and strengthen the management work of distribution line management distribution line failures. We must establish a certain management system to strengthen the management of distribution lines and strengthen the reward and punishment of line fault trips. It can fully mobilize the enthusiasm of the operation management unit to reduce the number of failures of the distribution line. In some places in China, some assessment systems for assessing abnormal distribution lines will be set up. If there is a trip failure in the line, it will be included in the assessment scope and find out the cause of the failure. Group management of each line, comprehensive ranking of line operation in a certain period of time, clear rewards and punishments, effectively improve the work efficiency of each unit, reducing the number of distribution line failures.
3.2 Promotion and application of gps line inspection system Now Zhejiang Electric Power Company has started to engage in network inspection project. Later, the 1:500 map of Zhejiang can be loaded into the GPS handset. Now the GPS handheld opportunity is recorded to record the tour track and can be selected on the spot. Defective equipment, because the PMS production management system of Zhejiang distribution network has been perfected in July 2011. The detailed parameters of various power equipments in the GIS module, including latitude and longitude, can be inquired in detail. These power devices are displayed on the map. And can be accurately positioned. This map is a map that will be loaded into the GPS handset later.
3.3 Establish real-time electronic picture files of the line
The GPS line patrol system has a significant effect, but there are management blind spots in the line channel, cross-over, building, soil, and sand. In order to ensure the stable operation of the company's distribution network, we innovated our work ideas, carried out the “seamless photo taking” of the distribution line and the whole area of ​​the station, and established the electronic information archives. That is, from the substation outlet to the last base tower, each base tower, each main line, branch line, and branch line are photographed at multiple angles, and digital photo image data is retained. All distribution areas are also photographed at multiple angles, and an electronic file is created.
After the implementation of the line inspection "dual system" management, especially after the establishment of the electronic file, each line corresponds to the panorama, the pole number plate, the pole top, the pole base, the pull line, the passage, the power distribution room corresponding to each power distribution area, The incoming line, transformer, switchboard, tool cabinet and sandbox all have digital video photo files, which are the first-hand information to control the lines and equipment at any time. The use of image data to manage line equipment defects has greatly improved work efficiency. The establishment of electronic files has also strengthened the equipment management of users, and timely rectified notices of major equipment defects, improving the user's equipment operation level.
3.4 Strengthening the standard management of the industrial expansion project In recent years, the tripping caused by the user equipment has remained high, and the reasons for the failure are mostly caused by the aging of the user's equipment or the use of counterfeit and fake electric equipment. We started to expand our business and strengthen quality management. The networked equipment used must use well-known brands to prevent counterfeit and inferior power equipment from entering the grid, eliminating a hidden danger of stable operation of the power grid. For users with transformer capacity of 400kVA and above, configure microcomputer protection equipment. For users with a transformer capacity of 400kVA and below, the drop switch is equipped with a high-voltage instant fuse to minimize the fault range. The quality of the user's power equipment has increased year by year, and the power grid operation has become more and more stable.
3.5 Increasing the intensity of line insulation reform and cleaning up roadblocks For the newly-built distribution lines, actively promote the use of insulated wires and gradually increase the insulation level of the lines. Strengthen the lightning protection work of the line, and install the lightning protection insulator reasonably on the insulated circuit to avoid the lightning strike caused by lightning strikes during thunderstorms. Insulation protection shall be implemented for the lines that cannot be insulated and modified temporarily, and the line breaking, corner, T connection and high-voltage metering, isolating switch and vacuum switch shall be insulated and transformed. The wiring of the power distribution room was replaced by an insulated wire, and a special wall-through casing for insulated wires was developed, which has remarkable effects.
In addition, in view of the increase in the number of roads in recent years and the failure caused by the space occupied by the distribution lines, the government should organize the obstacles of the roads and completely improve the operating environment of the lines to reduce the line faults caused by trees.
4 Conclusion The failure of the distribution line seriously affects the economic benefits of the power supply enterprise. At the same time, it also brings a lot of inconvenience to the masses. As the government should strengthen the protection of the line and improve the propaganda power, the power supply enterprise should do a good job. The safety protection measures of electric lines popularize the line safety knowledge to the public to reduce the failure and ensure the safe and reliable operation of the distribution line.