For example, if I want to build a large concrete mixing plant, do I need 10kV, 35kV distribution cabinets? How many can each station use?

What kind of station to build is related to your power demand. If the power required is large, the voltage level of the substation to be built will be high;

If the total power of the "large concrete mixing station" you build is less than 100kW, and there is a low-voltage power supply in the local area, that is, there is a transformer nearby, and this transformer has such a large surplus capacity, you can supply low-voltage power, that is, you can build a 380V distribution room;

If the total power of the "large concrete mixing plant" you built is below 5000kW, and there is 10kV power supply in the local area, and this line has such a large surplus capacity, you can build your own 10kV power distribution room and supply power through 10kV;

If the total power of the "large concrete mixing plant" you built is more than 5000kW, and there is 35kV Power Supply in the local area, and this line has such a large surplus capacity, you can build your own 35kV Power distribution room to supply power through 35kV;

The above is just a way to choose your own power supply mode by capacity, but this method needs to be verified by other conditions, such as the distance of power supply lines, equipment startup mode, power quality, loss efficiency, operation economy, etc.