Pumping station is an important part of water conservancy project. Tashan Pumping Station is located in Ganyu District, Lianyungang City, 2065438+March 9, 2004. The provincial development and reform commission approved the reconstruction project of Tashan pump in Ganyu County, Lianyungang City, and agreed to reconstruct the pump station. This pumping station was built in the 1970s and 1980s. After years of operation, it is seriously damaged and aged, which can no longer meet the needs of production and life. The main contents of the approved construction of this project are: according to the irrigation guarantee rate of 75% and the flood control standard of once every 20 to 30 years, the original pumping station will be demolished and related facilities will be updated. After the project is completed, it will play an important role in irrigation, flood control and drainage in this area.
Analysis of power supply mode of No.2 pumping station
2. 1 Determination of load grade
The main task of this project is the pumping station area under construction. According to the engineering characteristics and the basic principle of power load classification, all pumping stations in the irrigation area belong to agricultural irrigation pumping stations. If the power supply and drainage are stopped suddenly during the operation, the irrigation time will be delayed due to the maintenance of power supply equipment or lines, which will have a certain impact on irrigation in the irrigation area, but it will not cause significant economic losses, let alone personal injuries and deaths, and will not have a great impact on the life of villages near the irrigation area. Therefore, the load grade of each pumping station is basically determined as Grade III load.
2.2 Pump Station Load and Power Supply Mode
The main load of each pumping station in this project is the motor supporting the main pump, and the load in the station is mainly power, lighting and heating. The main transformer of each pumping station has a large capacity, so it is not suitable for light load operation during non-operation period. Therefore, an 80kVA station transformer is set respectively. According to the installation scale and load grade of each pumping station, the power supply scheme of each pumping station is basically determined based on the principle of making maximum use of the existing local power supply facilities to supply power nearby.
3 electrical system design of pumping station
3. 1 power connection mode
According to the actual situation of Tashan Pumping Station, the pumping station is a three-stage load pumping station, and the power supply is a single power supply. According to the reply of the electric power department, the power supply comes from Xinhe Substation in Ganyu District, and it is directly supplied by single loop 1 10kV line.
3.2 Electrical Main Wiring Design
Tashan Pumping Station adopts asynchronous motor provided by hydraulic machinery specialty. It is found that in order to improve the power factor, four asynchronous motors are used in the electrical engineering of Tashan Pumping Station, which have high and low voltage compensation, and there is no need to put in reactive power compensation devices when the units are running. 10kV high-voltage distribution bus adopts single-bus configuration mode, and electrical interlocking is set at two incoming lines. If one power supply fails or is overhauled due to power failure, Tashan Pumping Station will supply power through another power supply when it is loaded. The low-voltage distribution system is also a single bus sectional wiring system, and a bus contact switch is set. Under normal circumstances, the transformer is put into use at the same time. If one transformer fails, the other transformer can meet more than 70% of the requirements of the pumping station. The distribution system is very simple in wiring, convenient to operate, safe and reliable, and can meet the actual operation needs of production and equipment maintenance. The power distribution mode of Tashan Pumping Station is radial distribution, and the power supply of the main building is divided into two paths, one of which is powered by the first and second low-voltage buses respectively, which ensures the reliable and safe operation of the low-voltage distribution system.
4 Selection and arrangement of electrical equipment in pumping station
4. 1 Selection of electrical equipment
(1) High voltage switchgear. The high voltage switchgear used in this project mainly includes 10KV high voltage cable incoming+metering, 10kV VPT cabinet, substation transformer incoming protection cabinet, 10kV main transformer incoming protection cabinet, 10kV main transformer incoming protection cabinet, 10kV capacitor incoming protection cabinet and/. 35kV high-voltage cable incoming+metering, 35kVPT cabinet, transformer incoming protection cabinet of substation, 35kV main incoming protection cabinet and 35kV main transformer incoming protection cabinet ***6 sets. (2) Low-voltage switchgear. The low-voltage switchgear used in this project mainly includes 43 main transformer low-voltage incoming cabinets, pump control cabinets, low-voltage capacitor compensation cabinets, main transformer low-voltage wiring cabinets, station transformer low-voltage incoming cabinets, station transformer lighting distribution cabinets and station transformer distribution cabinets. 16 sets of electric butterfly valve control box, vacuum pump control box, solenoid valve control box and fan control box. (3) transformer. 1 SCB 10-1250/10, 3 SCBs10-800/10, 4 SCBs10-80. 10/0.4kV transformer adopts maintenance-free dry-type transformer, and the wiring mode is D.Yn 1 1 wiring group. (4) DC power supply screen. The DC power panel is mainly controlled by microcomputer. Equipped with 66Ah maintenance-free lead-acid battery. In addition, the input voltage of DC power board is three-phase 220V AC, and the output voltage is single-phase-1 10V DC. The number of output loops is 6, and the current is not less than 15A. (5) wires and cables. In the selection of wires and cables for Tashan Pumping Station, YJV XLPE insulated power cables are used for 10kV power cables and 0.4kV low-voltage cables, and KVV cables are used for control cables. In addition, the data cable for PLC is DJYPVP twisted pair shielded cable, and the outdoor buried cable is armored cable. (6) motor. In the previous electrical engineering design of pumping stations, because the unit capacity is generally small, the engineering importance is not high, and the requirements for motors are not high, comprehensive comparison and selection are rarely made. In recent years, due to the gradual increase of the total installed capacity and single machine capacity of pumping stations, some single machines have reached 10MW. Therefore, it is of great significance to choose the appropriate motor for the long-term and reasonable operation of the pumping station project.
4.2 Arrangement of Electrical Equipment
According to the civil and electrical design requirements of Tashan Pumping Station, the high-voltage cabinets of Tashan Pumping Station are arranged in a single row and installed in the high-pressure room. The switch cabinet is connected with the main transformer, switch cabinet and station transformer through 35kV-YJV22-3×35 cable. The main transformer is arranged in the main transformer room because its load is relatively simple and the distance between the low-voltage equipment and the main transformer is relatively close. In order to save the cost, the 35/0.4 main transformer is directly selected, and the secondary voltage is 400V V V. Through this arrangement, not only the investment can be reduced, but also the electrical wiring can be reduced, which is ultimately conducive to optimizing the overall design and overall cost performance of the electrical engineering of Tashan Pumping Station. In addition, the low-voltage switchgear is arranged in the low-voltage distribution room, because the wiring distance is very close and it is in a main factory building. Therefore, the low-voltage bus duct is used to connect the low-voltage side of the main transformer with the low-voltage distribution cabinet. Then the length of bus duct is designed according to the connection distance, and the final calculated length is 3m.
Design of Electrical Relay Protection for Tashan Pumping Station
Relay protection is a very important part of power supply system. Therefore, the selection of relay equipment should comply with safety, rapidity, sensitivity and other aspects, and at the same time, it should also meet the relevant technical regulations such as relay protection in the design process. According to the relevant regulations of our country, in the relay protection of Tashan Pumping Station, 3 ~ 66 kV power supply lines should be equipped with interphase short circuit protection, and each corresponding grounding protection and overload protection should be installed, and the power transformer should be equipped with corresponding single-phase grounding, turn-to-turn short circuit, overcurrent and overload protection devices. The protection of transformer in substation mainly lacks overcurrent protection, overload protection and zero sequence overcurrent protection.
6 conclusion
In this paper, the electrical engineering design of Tashan pumping station is studied and analyzed. The electrical design level of pumping station affects whether the pumping station is economical, practical, advanced and reliable, energy-saving and environmentally friendly, simple and convenient to operate and maintain, and whether the safety of staff is guaranteed. As a designer, we should keep learning, not only be familiar with the electrical design standards of water conservancy specialty, but also understand the specifications of other industries such as industry, architecture and municipal administration. Considering the actual needs of the project, we should consider introducing advanced products and technologies to lay a good foundation for the efficient operation of pumping stations and provide technical services for Lianyungang water conservancy.
I believe that after the above introduction, everyone has a certain understanding of the electrical engineering design and analysis of pumping stations. Welcome to Zhong Da for more information.
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