1. Different in nature:
AC panel: It is essentially a low-voltage power distribution cabinet, with AC input and AC output, generally matched with the DC panel to provide power to the DC panel and power distribution room for distribution;
DC screen: Under normal mains power supply, the DC screen converts AC into DC to charge the battery while providing output DC power. When the mains power fails, the battery pack supplies power to the high-voltage opening and closing mechanism, control system and comprehensive protection. power supply.
2. Different uses:
DC screen: Mainly used in substations, switching stations, ring network cabinets and box-type substations, for primary switchgear (vacuum circuit breakers, vacuum contactors, load switches) and secondary control, protection and signal circuits (such as microcomputers) Protection, remote control unit RTU, load control devices, indicator lights, analog indicators, smart meters, etc.) can also be used for emergency lighting in small power stations and power distribution rooms to provide reliable DC power. The system is intelligently managed and has a simple structure , Installation, operation and maintenance are extremely simple and convenient. The main function of the DC in the high voltage room is to provide power to the closing mechanism of the high voltage switch. For example, the electromagnetic type (CD) closing mechanism requires a large DC current, while the spring energy storage type (CT) closing mechanism is There is no need for a large DC current, as long as the voltage can meet the normal operation of the energy storage motor, and the DC bus on the top of the high-voltage switch can also provide DC power for signals, control, and alarm circuits, as well as some relay protection and The automatic device provides DC power supply. The DC power supply is used as the operating power supply and signal display alarm to provide electrical energy for the automatic or electric operation of the larger and more complex high and low voltage (high voltage is more commonly used) distribution system. It can also be integrated with the central signal screen. together.
Communication screen: mainly used for equipment that needs communication. For example, the DC screen also needs AC input, and the AC input power of other electric equipment, etc., are used to display the operating status of the high and low voltage distribution cabinets. Generally, there are current, voltage displays, and opening and closing instructions.
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