Introduction
China's box-type box transformers were originally developed from European box-type box transformers, and are often relatively large in size. With the opening up of China's foreign economy and the vigorous development of the market economy, American companies took the lead in entering the American box-type transformer in the Chinese market around the 1980s, and achieved rapid development in the Chinese market with its unique characteristics. From south to north, from east to west, you can see this kind of American box transformer almost everywhere in China, and most of them are imitation products of domestic manufacturers, and their quality can be said to be uneven. Through these years of application and practice, it is necessary to carefully analyze the American box-type transformer combined with China's national conditions and give it a correct positioning, so as to promote the technology and market development of China's box-type transformer.
Main features
Strong overload capability, allowing overload for multiple hours, and overload for multiple hours without affecting the life of the box transformer.
The elbow type plug connector is used to facilitate the connection of high-voltage incoming cables, and can be used as a load switch in an emergency, which can be unplugged and plugged in while the power is on.
Using double fuse protection, the plug-in fuse is a double-sensitive fuse (temperature current) to protect the short circuit fault that occurs on the secondary side of the box transformer. The backup current-limiting protection fuse protects the high-voltage side from faults occurring inside the box transformer.
Transformers generally use high ignition point oil.
All components such as high-voltage load switch protection fuses and transformer core windings are placed in the same tank.
Purpose of American box transformer
Combined American box transformer is to place the transformer body, high voltage load switch, fuse and other components together
American box transformer
in the transformer oil tank. In oil, the component volume is greatly reduced, the structure is more compact, and the installation is convenient and flexible. Fully insulated and fully sealed structure, safe and reliable, easy to operate and maintenance-free. It is widely used in residential areas, high industry centers, factories, mines, enterprises, airports, stations, schools and other places.
>American box transformer features compact structure, small size, convenient and flexible installation
Fully insulated and fully sealed structure, safe, reliable and maintenance-free, reliably protecting personal safety
The high voltage side is protected by double fuses, of which the plug-in fuse The device fuse is a double-sensitive fuse (temperature current) and the backup fuse is a current-limiting fuse, which reduces operating costs
The high-voltage incoming line adopts a cable connector structure, fully insulated, safe, reliable and easy to operate
Both available In the ring network, it can also be used in terminals. The conversion is very convenient and improves the reliability of power supply
The transformer has a three-phase three-column or three-phase five-column structure, and the iron core adopts stepped joint technology or rolled core technology. Low noise, low loss and strong resistance to short circuit and overload.
Adopting special processes of vacuum drying and vacuum oiling, our company will extend this process used in products to products, providing a strong guarantee for improving product quality.
The box can adopt anti-corrosion design and special spray painting treatment according to the requirements of the operating environment. It has three anti-corrosion functions, namely anti-condensation, anti-salt spray and anti-mold, and can meet the anti-corrosion requirements in high temperature and high humidity environments.
>Anti-corrosion and protection According to the American company's American box transformer information, the box adopts anti-corrosion design and special spray painting treatment, and can be applied to various harsh environments, such as stormy and highly polluted areas. The cabinet undergoes eight pre-treatment processes before painting, and then seven painting and baking processes before it is completed, which shows its cautious attitude towards anti-corrosion. Domestic production of American box-type box transformer casings has almost no special treatment. Basically, they are pickled and then electrostatic sprayed. Some companies even do not even pickle, and even worse, they only spray paint on the outer surface. , one can imagine the anti-corrosion ability of its shell. Even if it is treated by electrostatic spraying, there are often some dead corners when the bottom surface is treated, and it is difficult to spray powder on these untreated parts by electrostatic spraying, so there is bound to be a hidden danger of rust. Since the box transformer has to work in an outdoor environment exposed to wind, rain and sun for many years, if the surface is not treated well, the rust will be very serious. This issue is very important and has been a subject of great concern and research in China for decades. Therefore, many manufacturers use other technologies to solve this problem. Regarding protection issues, the transformer tank and heat sink of the American box-type transformer are partially exposed, and their purpose is to improve heat dissipation conditions. However, since it is directly exposed to the sun, the thermal radiation of the sun will not affect the temperature rise. In addition, the exposed parts are easily damaged by collisions and knocks from external forces. If it is damaged, a large amount of transformer oil will be lost, and the consequences will be disastrous. Therefore, some domestic manufacturers cover the heat sink with a layer of steel plate to increase the protection capability.
>High-voltage load switch The load switch of the American box-type transformer is placed in the transformer oil tank. Oil-immersed three-phase linkage switches can be divided into two types: two-position (terminal type) and four-position (ring network type). Since this load switch is placed in the transformer oil tank, its closing position can only be determined according to the instructions on the external operation panel. Judgment, and its operation must be carried out through a special insulated operating rod, so its operation is relatively complicated. From this point of view, its operation is very inconvenient. In addition, since the breaking contact of the load switch (that is, the obvious disconnection point) cannot be seen, it gives people a feeling of uneasiness after it is turned off. In addition, once the load switch fails, it will be very difficult to replace and repair the load switch. The switch generally uses a vacuum circuit breaker.
Maintenance
After the American box transformer is installed and used, it basically does not require maintenance. However, for domestically produced products, due to various reasons, the maintenance of box transformers is indispensable.
Due to technical problems with the surface treatment of the outer casing, inspection of its corrosion should be strengthened
The oil filled in the oil tank of American box transformers is generally insulating oil, its ignition point can reach ℃, and it has excellent electrothermal characteristics and insulation strength High lubricity, good arc-extinguishing ability, non-toxic, and can be biodegraded, thus minimizing harm to the environment and health. Insulating oil does not form sediments like traditional mineral oil, and domestically produced American-style boxes are extremely Part of it is filled with ordinary mineral oil. In addition, under normal circumstances, the upper part of the oil tank of American box transformers is filled with inert gas to prevent moisture in the air from being exchanged into the oil. However, domestic American box transformers may not be carried out by companies yet. For this work, the performance of the oil will decrease over time, and its sealing performance cannot meet individual requirements, so the oil must be changed regularly.
American box-type box transformers have no oil temperature protection and only have a thermometer to display the oil. temperature, when the oil temperature is too high, it relies on a plug-in fuse for protection, and there is also a pressure relief valve to release too much pressure in the oil tank. Therefore, you should always check whether the fuse is normal in these two situations. operation, and whether oil leakage occurs in the outer shell.
Since the oil tank of the American box-type transformer is exposed to the outside, it should be inspected frequently to prevent oil leakage from being damaged by external collisions.
Applicable Scope
② Urban public power distribution system, when the load increases in residential areas and busy streets, it is necessary to increase the transformer capacity.
② When there are existing buildings for temporary power supply at the construction site, it is necessary to modify or increase the power consumption Equipment, field operations and power supply for outdoor working places, such as oil fields, mining ports, dock stations, etc.
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