My opinion on line loss management of the hottest

  • Detail

Abstract: safety and loss reduction are the two themes of power enterprises. Line loss is a comprehensive technical index to measure and assess the production technology and management level of power supply enterprises, and it is also an important means and effective way to achieve economic operation and improve economic benefits

key words: Rural line loss management safety and loss reduction are the two major themes of power enterprises. Line loss is a comprehensive technical index to measure and assess the production technology and management level of power supply enterprises, and it is also an important means and effective way to achieve economic operation and improve economic benefits. Line loss is mainly composed of technical line loss and management line loss, although the size of the sample used is very small. Loss reduction should be based on technical loss reduction, but line loss management can not be ignored. After the comprehensive implementation of urban and rural power transformation, the level of safe power supply has been improved, and the work of reducing losses, saving energy and increasing efficiency has been effectively promoted. However, due to the constraints of funds, geographical conditions or historical relics, many county-level power plants have not been fundamentally and thoroughly transformed in a scientific and standardized manner. In addition, the corresponding systems have not been improved in a timely manner, and the management work has been divorced, resulting in a large gap between the actual line loss and the theoretical line loss, which directly affects the economic benefits of enterprises. 1. Improve the load rate of distribution transformer in rural distribution system, the transformer is in no-load operation during the day, resulting in the no-load loss of distribution transformer accounting for about 40% of the total 10kV distribution loss. Therefore, reducing the loss of distribution transformer plays a very important role in reducing the 10kV distribution loss. In the daily business management work, we should strengthen the testing of transformer load in each period and the statistics and analysis of monthly and annual power supply. On the premise of ensuring the power supply quality and bearing the maximum load, the load rate of the transformer should be increased as much as possible to reduce the no-load loss of the distribution transformer. To improve the utilization rate of public transformers in the substation area, the key is to do a good job in rural power marketing planning. For example, actively organize farmers to use the day to process more agricultural and sideline products such as bamboo and wood, and help them contact the market, which will not only increase the economic income of farmers, but also increase the electricity sales of power supply stations, and improve the economic operation utilization rate of transformers. 2 keep the low-voltage three-phase load basically balanced. In low-voltage power, due to the access of various single-phase loads, the three-phase loads are often very unbalanced, which will greatly increase the losses in transformers and low-voltage lines. Under the condition of transmitting the same power, the loss of transformer and line caused by three-phase load asymmetry is much higher than that of symmetrical operation, and the operation is extremely uneconomical. Generally, the unbalance rate of three-phase load current at the outlet of distribution transformer is not greater than 10%, and the unbalance rate of three-phase current at the beginning of low-voltage main line and main branch line is not greater than 20%. 3 reasonable reactive power compensation the general principle of rural electric reactive power compensation is: comprehensive planning, reasonable layout, decentralized compensation, local balance. According to the principle, the following measures can be considered in the distribution of reactive power compensation capacity. All major power users should install an appropriate amount of capacitors to control their receiving power factor above 0.85. The number and location of capacitors installed on the distribution line shall be calculated according to the principle of optimal loss. The capacity of the secondary substation is small, and the distribution is mostly radial. The reactive power flow often converges on the low-voltage bus of the secondary substation. Centralized compensation in the secondary substation is conducive to reducing the reactive power loss and the reactive load and reactive power loss of the front line, and making up for the lack of scattered capacitors installed on users and distribution lines. Centralized compensation in secondary transformer is also convenient for capacitor switching and management. Generally, the compensation capacity can be considered as about 30% of the main transformer capacity. When the substation load is very light, the compensation capacity can also be installed as 30% of the load first, but the possibility of adding compensation equipment with the increase of load should be considered. 4. Eliminate high-energy consumption and low-grade metering devices, and the metering gateway meters are inaccurate, resulting in inaccurate metering, and some have also lost electricity. The metering meters in rural distribution areas are more prominent. In the rotation and rotation calibration meters, the positive and negative errors of some meters are as high as 19%. Speed up the replacement of old electricity meters, and uniformly equip qualified electronic energy meters with small loss according to the voltage level and electric quantity specified in the measurement management regulations. The second is to strengthen measurement management, regularly inspect and patrol, etc., to ensure the accuracy of measurement. Our bureau has appropriated some funds, and can also measure the elastic modulus E and proportional limit of materials σ p. Elastic limit σ E, etc. help users have the same requirements for oil quality as general industrial valves, replace and eliminate old meters, speed up the replacement of old meters, and ensure that the accuracy of users' meters is within the standard range. 5. Strengthen the management of line loss. There are 26 small capacity hydropower stations invested and built by collectives and individuals in mountainous villages of Huitong County, which depend on the distribution lines of their villages respectively. Huaihua electric power bureau takes it as the measurement gateway of the power supply station. In the rainy season, when the hydropower station is full, the more power is added to the line, the greater the high-voltage line loss. There will be other phenomena in the use of other environmental experimental facilities in the power supply station. The highest high-voltage line loss in a month is 47.1%, and about 10% in the dry season. Through analysis and field investigation, it is found that the power factor of each small hydropower station is 1. Obviously, small hydropower stations are "active" and "reactive" at the same time, forming a large over-line loss on the distribution line. In order to facilitate the management of line loss, the power supply department actively negotiated with the local township government and small hydropower stations for many times, and reached an agreement through long-term efforts, thus reducing the burden of past line loss of the power supply station. 6. Strengthening business census and improving line quality provide technical guarantee for reducing line loss, but human factors appear. Before the agricultural reform, rural residents all implemented the "multi household joint meter system", which was the electricity bill settlement table. There are sub tables from the linked table to the user. Under normal circumstances, the sum of the sub table indexes should be equal to the linked table index. If the sum of household meters is less than the index of linked tables, it indicates that there is electricity theft, and users naturally supervise each other to prevent electricity theft. After the agricultural transformation, the system of "one household, one meter" is implemented, and the household meter is the electricity bill settlement table, and the users face the power supply station directly. There is no mutual supervision between users. On the contrary, users have changed from mutual supervision during the joint meter system to mutual teaching of "secrets" and "skills" of electricity theft after meter reading to the home. Some users even work together with several companies to take turns on duty "anti reconnaissance", monitor electricians to check electricity, and find that electricians check and inform each other, which greatly increases the difficulty of investigation, especially in busy farming or drought resistant seasons. To this end, Huaihua Electric Power Bureau carried out a general survey of anti stealing business, consisting of

Copyright © 2011 JIN SHI