The ZL-GZDW Intelligent DC Power System (commonly known as a DC Screen) is the critical heartbeat of high-voltage substations and power plants. This system converts AC input into a stabilized DC output to power signal circuits, protection relays, emergency lighting, and the opening/closing mechanisms of high-voltage circuit breakers.

Designed for unmanned substations, the GZDW series features a modular architecture with high-frequency switching power supply technology. It ensures that even during a complete AC grid failure, your control systems remain energized via the integrated battery bank. With its Intelligent Dual-AC Input and automated charging logic, it provides a "set-and-forget" reliability for critical infrastructure.

• Modular Redundancy (N+1): Utilizes multiple hot-swappable charging modules. If one module fails, the others automatically share the load, ensuring zero downtime for the DC bus.

• Intelligent Battery Management: Features automated "Float" and "Boost" charging cycles. The system monitors individual battery voltages, temperatures, and internal resistance to maximize the lifespan of Lead-Acid or Nickel-Cadmium banks.

• High-Frequency Switching Technology: Offers a high power factor, low ripple voltage, and high efficiency (≥92%), resulting in less heat generation and a smaller cabinet footprint.

• Dual AC Input with Auto-Transfer: Automatically switches between two independent AC sources to maintain constant DC output, featuring built-in surge and lightning protection.

• Full Digital Control & Monitoring: Equipped with a high-resolution touchscreen HMI that displays real-time system status, insulation monitoring data, and historical fault logs.

1. Substations (10kV - 500kV): Providing the essential DC control power for breaker operations and protection relays.

2. Power Generation Plants: Reliable backup power for thermal, hydro, and nuclear plant control systems.

3. Industrial Petrochemical & Mining: Ensuring safe shutdown and emergency control in facilities with hazardous processes.

4. Railway & Metro Systems: Supporting signaling and communication equipment in transit power hubs.

• Insulation Fault Detection: Includes a sophisticated branch insulation monitoring system that identifies precisely which circuit has a ground fault, preventing system-wide failures.

• Remote SCADA Integration: The system is "Smart Grid Ready," allowing operators to monitor battery health and system parameters remotely via Modbus or Ethernet gateways.

• Maintenance-Free Operation: Designed for long-term use in remote or unmanned locations with self-diagnostic features that alert operators to potential issues before they cause a shutdown.

• Rugged Enclosure Design: Housed in a standard 19-inch or 23-inch rack-mounted cabinet with high-grade electrostatic powder coating for corrosion resistance.

Q: Can I customize the battery capacity for my specific backup time requirement?

A: Absolutely. We calculate the battery AH rating based on your "Constant Load" and "Peak Closing Current" requirements to ensure the system meets your required backup duration (e.g., 2 hours, 8 hours, or 24 hours).

Q: Does the system protect against battery over-discharge?

A: Yes. The intelligent controller includes a Low Voltage Disconnect (LVD) feature that protects the battery bank from permanent damage by disconnecting non-critical loads during extended outages.

Q: How many charging modules can be installed?

A: The system is modular. Depending on the cabinet size and current requirements, we can configure anything from 2 to 20+ modules in parallel.

ZL-GZDW DC power source screen

Microcomputer controlled DC power supply system ZL-GZDW/GZTW series adopts integrated module structure design, which is mainly composed of monitoring module, rectifier module, insulation monitoring module, battery inspection module, AC/DC monitoring module,switch quantity monitoring module, step-down module, distribution unit, battery and cabinet. It has the characteristics of flexible configuration, stable performance, friendly interface, simple operation and intelligent management. Widely applicable to various types of power plants, substation (), mobile communication base station, industrial and mining enterprises, electric railways, airports, ports, and high-rise buildings, residential area, etc, can be used as high voltage switch, electrical protection, automatic equipment, communication equipment, program-controlled switches, power carrier machine operation and control of power supply equipment and so on.

Scope of application
The microcomputer controlled DC power supply panel ZL-GZDW is an integrated power supply panel designed for users with different capacities. The system is mainly composed of monitoring module, rectifier module, AC/DC monitoring module, insulation monitoring module, battery inspection module, switch quantity monitoring module, step-down module. It has the characteristics of stable performance, friendly interface, simple operation and intelligent management.

Applicable to different voltage levels of substations, power plants, industrial and mining enterprises, electrified railway and
high-rise buildings and other fields, can be used as high voltage switch, relay protection, automatic device operation power
supply and control power supply.