Box substation is generally composed of high voltage chamber, transformer chamber and low voltage chamber. Box transformer product is a relatively simple power transformation and distribution device, and the selection of transformer parts can be handled according to general rules, and the capacity is generally not more than 1250kVA. Here is a brief introduction to the scope of application and requirements of box-type substation:
area of application
First, it is mainly used in urban residential areas and streets, when the electricity consumption is at the peak. When the voltage needs to be increased, we need to use our equipment-box substation.
Second, it is mainly used for temporary power supply. For example, in the case of existing buildings, we need to transform electrical equipment. Box-type substations are often used in field operations, such as construction sites, docks, airports and so on.
general requirements
1. In the case of simple lighting and public power distribution, there is no need to set high-voltage metering in the high-voltage wiring scheme of box transformer, only low-voltage metering or no metering, and no compensation is needed. Feed-out circuit 4 ~ 6 times, controlled and protected by plastic circuit breaker;
Second, in the case of public power distribution of power lighting, the distribution circuit of box transformer has increased to 8 ~ 12 times, and in addition, it should have reactive power compensation function;
Third, self-maintenance electricity consumption and special circumstances.
Box-type substation occupies a small area. General box-type substation covers an area of only 5-6m2, which can even be reduced by 3-3.5m2.. It is suitable for industrial and mining enterprises, ports, residential quarters and other places with dense load, which can extend high-voltage power supply to the load center, reduce the radius of low-voltage power supply and reduce the loss. There are few low-voltage power supply lines, generally 4-6 lines. Shorten on-site construction period, less investment.
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