No matter what kind of material box transformer shell, according to the specification requirements must have: sun, rain, dust, rust, small animals (such as snakes) into the five prevention functions. The layout of high voltage metering cabinet in box type substation is generally composed of CT, Pt, meter, remote sensing and telemetry devices. In order to prevent the strong solar radiation in hot summer, the shell of European style substation is usually filled with insulation material with low thermal conductivity at the top. Commonly used fillers are: rock wool board, polystyrene porous materials, etc. European type high voltage distribution equipment of box type substation can be divided into terminal type and ring network type from the way of incoming line; overhead incoming line from the top of box type substation (traditional box type substation uses this method more) and underground incoming line from high voltage cable trench are generally accepted in modern design. The switch system is enclosed in the high-voltage cabinet door with plexiglass, and the switch operating mechanism is driven by the operating handle to carry out the operation of opening, breaking and grounding. This is the most simple and economical layout of traditional terminal type box transformer.
From the point of distribution equipment, the high-voltage switches accepted by the traditional box transformer are: fn-10 / 400-630a series of high-voltage load switches. The dynamic and static contacts of the switch are exposed to the air, so it's easy to see the change of the switch contacts In addition, it is equipped with fflaj-50-100a fuse with base, grounding switch, lightning arrester and live display. There are many key points in the surface of European box type transformer, and most of northern China accept traditional painting and painting In the economically developed areas of southern China, in addition to accepting the above essentials, we also paste colored ceramic tiles or veneers on the shell of the cement board layout for surface treatment, especially the box transformer in the residential area, which is more harmonious with the style of the local buildings.
The depth of high-voltage cabinet of European box type transformer varies according to the type of switch and switch cabinet selected and the manufacturer; the width of high-voltage cabinet is related to ring network or terminal type and whether there is high-voltage measurement, which should be flexibly determined according to the above specific environment. When the transformer is in operation, a large amount of heat energy will be generated in the box transformer and radiated to the transformer room, so the problem of heat dissipation and ventilation in the transformer room is the key problem to be considered in the design of European box transformer. In the design of European box transformer, except that the box transformer with small volume adopts natural ventilation, the temperature measurement protection is generally designed, which is solved by strong suppression of exhaust measures. When the transformer is running, a large amount of heat energy is generated continuously, which makes the temperature of the transformer room rise continuously, especially when the ambient temperature is high, the temperature rise is faster, so only relying on natural ventilation and heat dissipation can not ensure the reliable and safe operation of the transformer.
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