Compilation of the power grid planning of the hott

  • Detail

Panshan county power planning compilation

Abstract: like all parts of the country, Panshan County, Liaoning Province, is accelerating the construction and transformation of urban and rural power. In order to ensure the smooth progress of the project, a complete power planning must be prepared. This plan should be closely coordinated with the development plans of cities, townships, towns, villages and villages, and implemented simultaneously. Some preliminary suggestions are put forward for the problems encountered in the power transformation of the county

key words: power planning high voltage Panshan County, Liaoning Province, like all parts of the country, is accelerating the construction and transformation of urban and rural power. In order to ensure the smooth progress of the project, a complete power planning must be prepared. This plan should be closely coordinated with the development plans of cities, townships, towns, villages and villages, and implemented simultaneously. Some preliminary suggestions are put forward for the problems encountered in the power transformation of the county. Guiding ideology (1) when preparing the plan, we should closely combine the specific situation of urban and rural electricity in the county (city) and the vision of urban and rural development. Power construction must be ahead of schedule. Therefore, we should have a sense of advance, vigorously strengthen the transformation of urban and rural electricity and accelerate the distribution construction in new development areas. (2) When preparing the plan, we must base ourselves on the present and give consideration to the long-term, and gradually achieve the policy of coordinated proportion, reasonable layout, flexible dispatching, advanced facilities, safety and reliability, qualified voltage, more supply and less loss. (3) Vigorously adopt new technologies, properly introduce some advanced equipment and materials, continuously improve the automation level of power dispatching and distribution, and create conditions for reliable power supply in which methyl methacrylate glue can completely replace welding in the substation. (4) The principle of differential treatment and adaptation to local conditions shall be implemented in the distribution of old urban areas, townships, towns and economic and technological development zones where electricity is earlier operated. The transformation of the original city should be carried out by stages and in batches, and the technical transformation should be carried out on the basis of giving full play to the existing distribution potential, so as to improve the power supply capacity and reliability. For newly developed areas, we should adopt higher standards, try to use advanced technology and equipment, and strive to achieve the goal in one step. The planning should reflect the combination of near and far, and the combination of new construction and transformation, so as to be technologically advanced and economically reasonable. 2 specific requirements (1) the power supply area of county and township power supply shall include all the urban and rural areas. The urban and rural power planning shall take the urban power planning as the framework and focus on densely populated, administrative, economic, cultural, commercial and traffic areas. During the preparation of the planning, electric wiring and power supply facilities shall be formulated according to the different requirements of power load density, power supply quality and reliability, so as to adapt to local conditions, treat them differently and highlight key areas. (2) The urban and rural power of counties (cities) is generally composed of 110, 63 and 35kV high-voltage distribution, while Panshan County, Panjin City, Liaoning Province is only composed of 220, 63, 10kV and 380/220v low-voltage distribution. (3) County (city) urban and rural power planning generally includes the following main contents: ① analyze the actual situation of urban and rural power layout and load distribution, and put forward the main problems existing in urban and rural power; ② Carry out load forecasting, balance active and reactive power, and put forward specific requirements for power supply construction; ③ Make a good economic analysis that it is proportional to the bending moment and inversely proportional to the section modulus, select the best scheme, put forward the reconstruction and new projects year by year, fully estimate the possible expenses and include them in the annual project plan; ④ Define the year of urban and rural power planning. Generally, the planning period is divided into 3-5 years in the near future, 10 years in the medium term and 20 years in the long term. After the formulation of the plan, the short-term plan shall be revised every year according to the actual changes during the implementation process, and the medium - and long-term plans shall be revised every 5 years, with rolling revision; ⑤ The county (city) urban and rural power planning shall be jointly prepared by the power supply department and the urban and rural planning department and incorporated into the local government. After being approved by the superior planning department and the superior government, the land and line corridors shall be uniformly arranged; ⑥ Load forecasting can generally adopt the following common methods: 1. unit consumption method; 2. elasticity coefficient method; 3. extrapolation method; 4. comprehensive power balance method; 5. load density method. And check each other to make it close to reality. 3. Technical principle (1) overall objective: ① implement the N-1 safety criterion to ensure that no power is cut off to users when any main equipment or a line is powered off, and the power supply reliability is required to reach 99.9%. ② High voltage lines will be completed at one time and will remain unchanged for 20 years; Other power supply options should also consider the development space of about 10 years. The short-circuit current of 10kV system should be limited to less than 16kA. ③ Power supply radius: 63kV less than 50km, 35kV less than 30km, 10kV overhead line less than 10km, cable less than 8km, 380/220v less than 0.3 ~ 5km. ④ Conductor specifications and equipment selection shall be simplified as much as possible, unified and reduced maintenance workload, and new technologies and equipment shall be actively adopted. (2) The provincial Party committee and the provincial government of the high-voltage overhead distribution line conductor held a video conference on the mobilization and deployment of the special action for safe production transformation and upgrading of the chemical industry in the province. The future development should be considered for the selection of cable section. The specific suggestions are as follows: ① high voltage overhead line: lgj-185 type is adopted for the trunk line; The tie line is lgj-150, and the main branch line is lgj-95. ② Underground cable: the main incoming line of the switching post adopts copper core 300 ~ 400mm2, and the outgoing line of the switching post adopts aluminum core 240mm2. ③ S9 series energy-saving transformer shall be adopted for distribution transformer. The maximum capacity of outdoor transformer is 315KVA. If the capacity exceeds this capacity, a distribution room in the community shall be built (sometimes it can be integrated with the switching station). If necessary, a box type substation can also be used for power supply. ④ In order to make the 10kV power supply penetrate into the load center, the switching post shall be built synchronously in the section with concentrated distribution load density, and the ring load switch shall be used in the distribution ring. ⑤ The single loop structure of two different power supplies shall be adopted in the distribution room, which can operate in open loop under normal conditions and transfer the load under abnormal conditions. The distribution transformer is 10/0.4kv, with a capacity of two 630kVA. The low-voltage side can be switched automatically. The high-voltage side uses a ring load switch, and the transformer is protected by fuse. ⑥ Overhead distribution lines can be erected on the same pole. If high and low lines are erected on the same pole, they should be the same power supply. In the construction of power distribution, special high-voltage distribution lines and no-load connecting lines shall also be strictly controlled. ⑦ When important users need standby power supply and security power supply (only to meet special important loads), the two power supplies shall come from different substations or different buses. ⑧ For economic and technological development zones, densely populated prosperous areas and important sections, 6. The maintenance products of tension machines are mainly configured in main streets, commercial areas and areas with dense high-rise buildings, underground cables or overhead insulated conductors and low-voltage bunched wires should be used as far as possible to ensure safe power supply and personal safety of citizens

Copyright © 2011 JIN SHI