Box-type substation is a high-voltage switchgear, transformers and low-voltage distribution equipment, according to a certain wiring plan into one of the factory prefabricated indoor, outdoor compact distribution equipment, will be high-voltage by electricity, transformer step-down, low-voltage power distribution and other functions organically combined, installed in a moisture-proof, rust-proof, dustproof, rodent, fire, anti-theft, heat insulation, fully closed, removable steel box, mechanical and electrical integration, fully closed operation, Box Type Transformer Substation it replaces the original civil distribution room, distribution station, as a new set of variable distribution equipment.
The box-type substation is composed of three parts: the base, the shell and the top cover. The base is generally grooved steel, angle, flat steel, steel plate, etc., group welding or bolt connection fixed forming, in order to meet the needs of ventilation, cooling and access lines, Box Type Transformer Substation but also in the appropriate position to open the bar and the size of a moderate circular hole. The casing, top-cover groove steel, angle steel, steel plate, aluminum alloy plate, color steel plate, cement board and so on bending, Box Type Transformer Substation group welding or with screws, hinges or related to the special attachment forming. No matter what kind of material box shell, according to the standard requirements must have: Sun, rain, dust, rust, prevent small animals (such as snakes) into the five of the prevention function. The enclosure body is usually provided with a heat insulating material with lower thermal conductivity as filler for preventing intense sunlight radiation in hot summer. The commonly used fillers are: Rock wool board, polystyrene foam and so on. In the unified design of the traditional "modular substation", the general in the shell also filled with heat-insulating filler, this method is no longer used by most designers, this is because: although the heat insulation filler can prevent the intense summer sun radiation, at the same time, it also hinders the transformer to produce a lot of heat distribution, so the designers in addition to keep the shell on the shutter hole method, Box Type Transformer Substation at the same time to increase the heat dissipation area, strengthen the air convection method of cooling, but also reduce the cost of manufacturing.
Second, the Characteristics of box-type substation
2.1 Technologically advanced safe and reliable
The problems needing attention in the application and design of box-type substation The cabinet part adopts the domestic leading technology and technology, Box Type Transformer Substation the shell generally uses the aluminized zinc steel plate, the frame adopts the standard container material and the manufacture craft, has a good anti-corrosion performance, to ensure that 20 years without corrosion, the use of aluminum alloy buckle plate, interlayer use fire insulation materials, box installation of air-conditioning and dehumidification devices, equipment operation is not subject to natural climatic environment and external pollution, Box Type Transformer Substation can ensure the normal operation in the harsh environment of -40℃~+40℃.
The box is equipped with a unit vacuum switch cabinet, a dry type transformer, a dry type transformer, vacuum circuit breaker (spring operating mechanism) and other domestic technology leading equipment, the product no exposed live part, for the entire insulation structure, can reach 0 electric shock accident, the whole station can realize no oil operation, high security, two times adopt microcomputer integrated automation system, can realize unattended. 2.2 High degree of automation
The whole station intellectualized design, Box Type Transformer Substation the protection system uses the substation microcomputer comprehensive automation installment, decentralized installation, can achieve "four-remote", that is, telemetry, remote letter, remote control, remote control, each unit has independent operation function, the Relay protection function is complete, the operating parameters can be set far away, the box inside humidity, temperature control, to meet the requirements of unmanned.
2.3 Factory Prefabrication
Design, as long as the design personnel according to the actual requirements of the substation, make a main wiring diagram and the design of the outside equipment, Box Type Transformer Substation you can choose from the manufacturer to provide the box variable specifications and models, all equipment in the factory installation, debugging qualified, the real realization of the substation construction factory, shorten the design and manufacturing cycle; on-site installation only need box positioning, enclosure cable contact, Box Type Transformer Substation outlet cable Connection, protection fixed value check, transmission test and other debugging work, the entire substation from installation to commissioning about 5-8 days time , and greatly shorten the construction period.
2.4 Combination Way Flexible
Box-type substation because of the compact structure, each box constitutes an independent system, which makes the combination of flexible and changeable, Box Type Transformer Substation we can all adopt box-type, that is, 35kV and 10kV equipment installed in all boxes, composed of box-type substation; also can use 35kV equipment outdoor installation, 10kV equipment and Control protection system box installation, this combination of methods, especially suitable for rural network transformation of the old station, that is, the original 35kV equipment does not move, Only one 10kV switch box can be installed to meet unattended requirements.
2.5 Investment Province, quick
Box-type substation (35kV equipment outdoor layout, 10kV equipment box installation) More than the same scale from the substation (35kV equipment outdoor layout, 10kV equipment arranged in the indoor high-voltage switchgear room and the central control room) to reduce investment $number.
2.6 Small Footprint
Taking 4000KVA single Transformer substation as an example, the construction of a conventional 35kV substation is about 3000 square meters, and a large-scale civil engineering is needed. Box Type Transformer Substation And the choice of box-type substation, the main transformer and switch box two box covers an area of the smallest to 100 square meters, including 35kv other equipment covers a total area of 300 square meters, only for the same scale substation covers an area of 1/10, in line with the country's policy of land conservation.