The equipment cabinets used in the substation system mainly include HVDB (High Voltage Distribution Box), incoming cubicle, Feeder Cabinet, metering instrument cubicle, Potential Transformer Cabinet, Transfer Switch Cabinet, bus compler cubicle, isolation cubicle, Ring Main Unit. The control power supply of these equipment cabinets is DC power supply. At the same time, the DC power supply has the following requirements:

1. Stable power supply: The DC screen/charger can provide stable and reliable DC power supply for various devices to ensure the normal operation of the power system. In substation, DC panel/charger provides stable DC power supply to various power equipment, which is the core power supply of modern substation.

2. Control and protection: DC panel/charger is the basic equipment for power system control and protection, providing power for circuit breaker control operation to ensure the safety and stability of the power system. It has a variety of protection measures, including preventing the occurrence of abnormal conditions such as excessive current or short circuit, so as to ensure the safety of the device.

3. Emergency power supply: When the external AC power is interrupted, the DC panel/charger can continue to provide DC power through the battery to ensure the load demand on the DC bus in a short time. This characteristic makes the DC screen an emergency power supply, which can guarantee the power supply at critical times.

4. Easy maintenance: DC screen/charger adopts intelligent maintenance-free design, which reduces the difficulty and cost of maintenance and improves the reliability and stability of the equipment. This design reduces the maintenance effort and cost, while ensuring the continuous and stable operation of the equipment.

5. Strong adaptability: DC screen/charger can adapt to a variety of Ring Main Unit, Distribution cabinet, Gas Insulated Switchgear and other environments to meet the needs of different occasions. This adaptability allows DC panels/chargers to play an important role in a variety of substation environments.

To sum up, the important role of DC panel/charger in the substation is reflected in providing stable and reliable power supply, ensuring the safe and stable operation of the power system, providing emergency power supply and adapting to various environmental conditions, etc. Therefore, DC panel/charger is one of the indispensable important equipment in the substation. With the continuous development and upgrading of the power system, the DC screen/charger is only one of the digital control, protection, management, measurement of the DC system, with the development of society, the charger/DC screen is also constantly innovating and developing, using efficient and energy-saving design concept, with more stable, reliable and safe performance.