1、 Meaning and function of DC screenDC screen is the abbreviation for DC power operating system. The universal name is Intelligent Maintenance-free DC Power Supply Screen, abbreviated as DC Screen, and the universal model is GZDW, and DC Screen is used to supply this type of DC power.

The power operation power supply in power plants and substations currently uses DC power supply, which provides power for controlling loads, power loads, and DC accident lighting loads, and is the foundation of contemporary power system control and protection.

The DC screen consists of an AC distribution unit, a charging module unit, a step-down silicon chain unit, a DC feeding unit, a distribution monitoring unit, a monitoring module unit, and an insulation monitoring unit. Mainly used in small and medium-sized power plants, hydropower stations, various substations, and other users who use DC equipment (such as petrochemicals, mines, railways, etc.) in the power system, suitable for instruments, meters, relay protection, and fault lighting in switch opening and closing and secondary circuits.DC screen is a new type of digital control, protection, management, and measurement DC system.

2、 Working principle of DC screenThe DC screen switches between two AC power lines and inputs one AC power line to supply power to each charging module. The DC screen charging module converts the input three-phase AC power into DC power, charges the battery, and supplies power to the closing load. In addition, the closing bus supplies power to the control bus through a voltage reduction device.The basic monitoring units in the system are managed and controlled by the main monitoring unit, and the information collected by each basic monitoring unit is sent to the main monitoring unit for unified management through communication lines.The main monitoring displays various information of the DC system, and users can also touch the display screen to query information and operate. The system information can also be connected to the remote monitoring system.In addition to basic AC monitoring, DC monitoring, and switch quantity monitoring, DC screens can also be equipped with insulation monitoring and battery inspection functions to comprehensively monitor the DC system.

3、 Main features of DC screenThe system adopts monitoring devices with built-in insulation monitoring, battery detection, grounding selection, battery activation, silicon chain voltage regulation, central signal and other functional units, greatly facilitating user use;The DC screen system adopts a unique&quo; One line communication; Wiring technology greatly facilitates the on-screen wiring of large capacity DC systems and facilitates user maintenance;The charging module adopts natural cooling method, which greatly improves the average time between failures and can be used in relatively harsh environments;The charging module can be plugged and unplugged with power, greatly reducing the average maintenance time;

● Adopting the latest international soft switching technology, the main components are made of high-quality branded products;

● Hardware low differential autonomous current sharing technology, with maximum output current imbalance between modules better than± 5%;Reliable lightning protection and highly effective electrical insulation protection measures, with insulation monitoring devices monitoring the insulation status of the system in real time to ensure system and personal safety;

The monitoring module adopts a large LCD touch screen display, with real person voice alarms;The monitoring program adopts an object-oriented design concept and modular programming, which is conducive to program maintenance and upgrading;

● It can set the parameters of various parts of the system through the monitoring module and has detailed online help functions;Equipped with advanced functions such as smooth adjustment of output voltage and current, and automatic temperature compensation for batteries;

Combining modern power electronics technology with computer technology to achieve control over power systems; Telemetry, remote control, remote signaling, remote adjustment; And achieve unmanned operation;

● Automatic management and protection of batteries, real-time automatic monitoring of terminal voltage, charging and discharging current of batteries, and control of even and float charging of batteries. Equipped with battery overvoltage and charging overcurrent sound and light alarms;The device can provide program support through public telephone lines to achieve remote maintenance and diagnosis.