What role does AC screen play in power system and where should it be placed?

The AC screen is used to display the running status of high and low voltage power distribution cabinets, generally including current and voltage display, opening and closing instructions, etc. The AC screen is essentially a low-voltage power distribution cabinet, which exchanges in and out, and is generally matched with the DC screen to provide power distribution for the DC screen and the power distribution room. The AC screen distributes the alternating current provided by the transformer to each load feeder in the substation and provides the alternating current. The input of AC screen is AC, and the output is AC. When the AC power supply is cut off, the AC screen has no output. AC screens are used in large, medium and small power plants and substations.