European box-type substation and American box-type transformer comparison

Box-type substation according to the different structure and the use of different components, is divided into European box-type substation and American box-type substation two styles.

One: analysis from the structure

From the structure of the use of high and low voltage switchgear, transformer composition, this box-type substation is called European box transformer. It is compared to building a house for high and low voltage switchgear and transformer.

In the structure, the load switch, ring switch and fuse structure are simplified into the transformer tank immersed in oil, the arrester is also oil-immersed zinc oxide arrester, the transformer cancels the oil cushion, the tank and the radiator are exposed to the air, this box-type substation is called the American box transformer. It’s like hanging a box next to a transformer.

Two: From the volume of comparison

From the volume point of view, the European box changes due to the internal installation of conventional switchgear and transformers, the product volume is larger. The American box is smaller due to the integrated installation.

Three: Comparative analysis from the protection aspect
The following is a picture of the garden box substation.

From the protection aspect, the load switch and current limiting fuse protection are used on the high voltage side of the European box. When a phase fuse is blown, the firing pin of the fuse is used to make the load switch switch at the same time to avoid phase loss operation, and the load switch is required to have the ability to cut off the transfer current. The low voltage side uses the load switch and current limiting fuse protection, and the high voltage side of the American box uses the fuse protection, and the load switch only has the function of switching and cutting off the high voltage load current, and the capacity is small. When a phase fuse is blown on the high voltage side, the voltage on the low voltage side is reduced, and the under-voltage protection or over-current protection of the MCCB automatic air switch will act, and the low voltage operation will not occur.