The main transformer is chosen in principle
Transformer selection, you can refer to the following, but still according to the actual production needs!
1, the number of transformers to determine
???(1), the number of main transformer to determine the principle is to ensure the reliability of power supply. When one of the following conditions is met, two or more transformers shall be installed.
???①, there are a lot of first-class load and although the secondary load but need to set from the security (such as fire, etc.).
???②, when the seasonal load changes greatly.
???③, when the load is large.
???For large-scale hub substation, according to the specific circumstances of the project can be installed 2 to 4 main transformer.
???When installing multiple transformers, it is appropriate to group the transformer according to the characteristics and changes of the load in order to flexibly switch the corresponding transformer group. Transformers should be operated in the sorted manner. Transformer low-voltage outlet of the neutral and neutral ground wire should be laid separately. For the convenience of testing, in the ground circuit, close to the transformer to do a removable connection device.
???(2), the general three-level load or capacity is not too much power and lighting should be a load with only one transformer.
???(3), when any of the following circumstances, can be dedicated transformer
???①, when the lighting load is large or power and lighting using a common transformer seriously affect the lighting quality and lamp life, can be set for lighting special transformer.
???②, single single-phase load is large, should be set single-phase transformer.
???③, the impact of a larger load, seriously affect the power quality, can be set for shock load special transformer.
???④, when the seasonal load (such as air conditioning equipment, etc.) about the total load of the project 1/3 and above, it is appropriate to configure a dedicated transformer.
