Development of the hottest box type substation

Box type substation intensively develops oil and gas chemical industry, oil storage, integration of Forest Pulp and paper, automobile manufacturing, ship repair, mineral resources processing, agricultural products processing, pharmaceutical and other industrial stations

Abstract: box type substation is also known as outdoor complete substation, also known as combined substation. It is a new type of outdoor complete substation equipment developed from the 1960s to 1970s in western developed countries such as Europe and the United States, Because it has the advantages of flexible combination, convenient transportation, migration and installation, short construction period, low operation cost, pollution-free and maintenance free, it has been paid attention to by power workers all over the world. In the mid-1990s, simple box type substations began to appear in China, and the Ministry of electric power also formulated ministerial standards accordingly, but they were not widely used. By the late 1990s, especially after the start of the agricultural reconstruction project, scientific research and development, manufacturing technology and scale had entered a high-speed development, and were widely used in the construction and reconstruction of 10 ~ 110kV small and medium-sized transformer (distribution) stations, factories, mines and mobile operation substations in urban and rural areas, Because it is easy to go deep into the load center, reduce the power supply radius and improve the terminal voltage quality, it is especially suitable for rural power transformation, and is known as the target mode of substation construction in the 21st century

key words: characteristics of box type substation development 1 box type substation development box type substation is also known as outdoor complete substation, also known as combined substation. It is a new type of outdoor complete substation equipment developed from the 1960s to 1970s in western developed countries such as Europe and the United States. Because of its flexible combination, it is convenient for transportation, migration, installation, short construction cycle, low operation cost, pollution-free Maintenance free and other advantages have been valued by power workers all over the world. In the mid-1990s, simple box type substations began to appear in China, and the Ministry of electric power also formulated ministerial standards accordingly, but they were not widely used. By the late 1990s, especially after the start of the agricultural reconstruction project, scientific research and development, manufacturing technology and scale had entered a high-speed development, and were widely used in the construction and reconstruction of 10 ~ 110kV small and medium-sized transformer (distribution) stations, factories, mines and mobile operation substations in urban and rural areas, Because it is easy to go deep into the load center, reduce the power supply radius and improve the terminal voltage quality, it is especially suitable for rural power transformation, and is known as the target mode of substation construction in the 21st century. 2. Characteristics of box type substation box type substation is mainly composed of multi circuit high-voltage switch system, armored bus, substation integrated automation system, communication, telecontrol, metering, capacitance compensation, DC power supply and other electrical units. It is installed in a moisture-proof, rust proof, dust-proof, rat proof, fire-proof, theft-proof, heat insulation, fully enclosed, movable steel structure box, electromechanical integration, fully enclosed operation, It mainly has the following characteristics: (1) advanced technology, safety and reliability: the box part adopts the current domestic leading technology and process, the shell is generally made of aluminized zinc steel plate, the frame is made of standard container materials and manufacturing process, which has good anti-corrosion performance to ensure that it will not rust for 20 years, the inner sealing plate is made of aluminum alloy gusset plate, the interlayer is made of fireproof and thermal insulation materials, and the box body is equipped with air conditioning and dehumidification devices, The operation of the equipment is not affected by the natural climate environment and external pollution, which can ensure the normal operation under the harsh environment of -40 ℃ ~ +40 ℃. The primary equipment in the box adopts fully enclosed high-voltage switchgear (such as XGN type), dry-type transformer, dry-type transformer, vacuum circuit breaker, spring operating mechanism, rotary disconnector and other domestic technology leading equipment. The products have no exposed live parts, and are fully enclosed and insulated structure, which can completely achieve zero electric shock accident. The whole station can realize oil-free operation with high safety. The secondary adopts microcomputer integrated automation system, It can be unattended. (2) High degree of automation: the intelligent design of the whole station, the protection system adopts the microcomputer integrated automation device of the substation, which is installed dispersedly, and can realize four remotes, namely telemetry, remote signaling, remote control and remote adjustment. Each unit has independent operation function, and the relay protection function is complete. It can remotely set the operation parameters, control the humidity and temperature in the box and remote smoke alarm, so as to meet the requirements of unattended; It can also realize image remote monitoring as needed. (3) Factory prefabrication: during the design, as long as the designer makes a primary main wiring diagram and the design of equipment outside the box according to the actual requirements of the substation, he can choose the specifications and models of the box transformer provided by the manufacturer. All equipment can be installed and debugged in the factory at one time, which truly realizes the industrialization of substation construction and shortens the design and manufacturing cycle; On site installation only requires box positioning, cable connection between boxes, outgoing cable connection, protection setting verification, transmission test and other work requiring commissioning. The whole substation only takes about 5 ~ 8 days from installation to operation, which greatly shortens the construction period. (4) Flexible combination mode: due to the compact structure of the box type substation, each box forms an independent system, which makes the combination mode flexible. On the one hand, we can all adopt the box type, that is, 35kV and 10kV equipment are installed in all boxes to form a full box type substation; It can also be installed only with 10kV switch box, 35kV equipment outdoors, and 10kV equipment and control and protection system box. For this combination mode, it is especially suitable for the old station reconstruction in the agricultural reconstruction, that is, the original 35kV equipment does not move, and only one 10kV switch box can be installed to meet the requirements of unattended. In short, there is no fixed combination mode for box type substation, and the user can freely combine some modes according to the actual situation to meet the needs of safe operation. (5) Investment saving and quick effect: the investment of box type substation is reduced by 40% - 50% compared with the conventional substation of the same scale. Calculated by the 4000kva substation of 35kV single main substation, the potential of the demand for rare earth nano materials is particularly important, so that the product itself can be brought into play. The construction project (including land acquisition cost) of box type substation is more than 1 million yuan less than that of conventional substation; If the experimental machine is changed from the angle of completion and production, it is analyzed from the aspect of appearance and some basic uses. It is conservatively estimated that if each station is put into operation 4 months in advance, if the average load is 2000kW, the profit from power sales is 0.10 yuan/kw h. The net profit can be increased by more than 600000 yuan in three months; From the perspective of operation, in the box type substation, due to the selection of advanced equipment, especially the operation of oil-free equipment, the problem of equipment leakage in the conventional substation has been fundamentally solved. The substation can implement condition based maintenance, reduce the maintenance workload, and save about 100000 yuan of operation and maintenance costs every year. The overall economic benefit is very considerable. (6) Small area: taking 4000kva single main substation as an example, it takes about