The DC panel is a new type of DC system with digital control, protection, management and measurement. The monitoring host part is highly integrated and adopts a single-board structure, including functions such as insulation monitoring, battery inspection, grounding line selection, battery activation, silicon chain voltage stabilization, and microcomputer central signal. The host is equipped with a large LCD touch screen, and various operating status and parameters are displayed in Chinese characters. The overall design is convenient and concise, and the human-machine interface is friendly and in line with user habits.
The DC screen system provides powerful functions for remote detection and control, and has remote control, remote adjustment, telemetry, remote signaling functions and remote communication interfaces. Through the remote communication interface, the operating parameters of the DC power system can be obtained remotely. The operating status and fixed values can also be set and modified through this interface to meet the requirements of power automation and unattended substations of the power system; equipped with RS232/485 serial interface and Ethernet interface, which can be easily integrated into the power station automation system.
The function of DC screen
Simply put, the working principle of the DC panel is to convert alternating current into direct current and provide power supply for the protection and operating mechanism of electrical secondary equipment and indicator lights. Its main functions are as follows:
1. Under normal circumstances, the charging unit charges the battery and provides DC power to regular loads (microcomputer protection devices, control equipment, etc.);
2. When the control load or power load requires a large impact current (such as the opening and closing of a circuit breaker), the charging unit and the battery jointly provide DC power;
3. When the AC of the substation is interrupted, the battery pack alone provides DC power.
Main features of DC screen
■Adopt modular design of switching power supply and N+1 hot backup.
■The charging module can be hot-swapped when powered, greatly reducing the average maintenance time.
■The power bus and control bus can be directly powered by the charging module alone, and can be hot-backed up through the voltage reduction device.
■Hardware low-difference independent current sharing technology, the maximum imbalance of output current between modules is better than 5%.
■Reliable lightning protection and electrical insulation measures. The insulation monitoring device can monitor the insulation condition of the system in real time to ensure system and personal safety.
■The system design adopts international standards such as IEC and UL, and the reliability and safety are fully guaranteed.
■The monitoring module adopts large-screen LCD display with Chinese characters and audible and visual alarms.
■The parameters of each part of the system can be set through the monitoring module. The module has the function of smoothly adjusting the output voltage and current, and has the function of battery charging temperature compensation.
■It has multiple expansion communication ports and can be connected to a variety of external intelligent devices (such as battery testers, insulation monitor devices, etc.).
■The combination of modern power electronics and computer network technology provides support for "telemetry, remote control, remote signaling, and remote adjustment" of the power system, enabling unattended operation.
■ Automatic battery management and protection, real-time automatic detection of battery terminal voltage, charging and discharging current, and intelligent control of battery float charging. It is equipped with audible and visual alarms for battery over-under voltage and charging over-current.
■The system uses monitoring devices with built-in functional units such as insulation monitoring, battery detection, grounding line selection, battery activation, silicon chain voltage regulation, and central signaling, which greatly facilitates user use; the system adopts unique "one-line" wiring technology, which greatly facilitates users The in-screen wiring of the capacity DC system is convenient for user maintenance.
■The charging module adopts natural cooling method, which greatly improves the mean time between failures and can be used in places with relatively harsh environments.
■The charging module can be plugged and unplugged when powered, significantly reducing the average maintenance time.
■Using the latest international soft switching technology, the main components are high-quality brand-name products.
■Hardware low-difference independent current sharing technology, the maximum imbalance of output current between modules is better than ±5%.
■Reliable lightning protection and high electrical insulation protection measures. The insulation monitoring device monitors the system insulation condition in real time to ensure system and personal safety.
■The monitoring module adopts large-screen LCD touch screen display and real-person voice alarm.
■The monitoring program adopts object-oriented design ideas and modular programming, which is conducive to program maintenance and upgrades.
■The parameters of each part of the system can be set through the monitoring module, and it has a detailed online help function.
■It has advanced functions such as smooth adjustment of output voltage and current, automatic battery temperature compensation, etc.
■The combination of modern power electronics technology and computer technology enables "telemetry, remote control, remote signaling, and remote adjustment" of the power system and unattended operation.
■ Automatic battery management and protection, real-time automatic monitoring of battery terminal voltage, charge and discharge current, and control of battery equalization and float charging. It is equipped with audible and visual alarms for battery over-under voltage and charging over-current.
