GWPS-DCD220-400W Distributed DC Power Supply Systems

Product Positioning

• This product is precisely optimized for small distribution sites equipped with 1～2 switchgear panels, particularly scenarios where space is limited and station scale is small. Compared with traditional centralized DC panels, it eliminates the need for independent DC panel rooms and reduces additional costs associated with civil works, cabinet procurement and wiring modifications. It realizes a distributed independent power supply architecture featuring one power supply per panel.
• Independent power supply for each panel avoids mutual interference, fundamentally improving the overall reliability of secondary power supplies in distribution networks. It is the recommended alternative to conventional DC panels for small distribution sites.

Core Advantages

• Highly Reliable Distributed Architecture
  Adopting a distributed independent power supply design, failure of a single power unit only affects the corresponding switchgear panel and does not propagate to other circuits. Overall system availability is significantly enhanced, eliminating the risk of station-wide power outages caused by single-point failures inherent in centralized schemes.
• Ultra-compact Footprint – No Civil Works Required
  The integrated embedded design enables direct installation inside switchgear instrument doors. No separate cabinet or dedicated room is required, drastically reducing the floor space occupied by power distribution equipment.
• Wide Input Voltage Range for Flexible Power Sourcing
  Supports a wide AC input range of 85～265V AC, compatible with both mains supply and local voltage transformer (PT) tapping, adapting to various on-site power conditions.
• Intelligent Operation and Maintenance Management
  Equipped with an intelligent battery management system that automatically controls charging and discharging cycles. It supports remote communication and Four-Remote Functions (Telemetry, Teleindication, Telecontrol and Teleadjustment), meeting the requirements of distribution automation and unattended operation.
• Sufficient Power Margin with Strong Surge Withstand Capability
  Steady-state continuous power and instantaneous surge power are strictly differentiated to match equipment operating and switch actuation conditions. Ample battery discharge margin ensures stable support for multiple consecutive closing and opening operations of circuit breakers.

Scope of Application

The product is applicable to medium-voltage distribution systems with AC 50Hz and rated voltages up to 10kV. It is widely deployed in urban distribution networks, rural grid renovation projects, compact substations, outdoor RMUs and other similar scenarios. It supplies uninterrupted DC operating, control and signaling power for core primary and secondary equipment within substations.

Compatible Equipment:

Technical Parameters

Power Definition

The product strictly differentiates between steady-state load and instantaneous surge load. The dual-power design precisely matches equipment operating conditions and switch actuation requirements, balancing daily supply stability with instantaneous operational reliability.

Parameter Notes:

• The system is standard-fitted with two 12V / 12～20Ah batteries connected in series (24V DC side). The unit embeds high-performance DC/DC conversion circuits and supports optional output voltage configurations including DC 220V / 110V / 48V / 24V to match the rated working voltages of various devices.
• Under 400W instantaneous power conditions, the instantaneous current on the battery side is approximately 19.6A, which is below the 3C discharge capability (36A) of 12Ah batteries. This sufficient power and current margin guarantees reliable multiple closing and opening operations of the switchgear

Core Parameters

Core Functions

Intelligent Power Management with Seamless Transfer

• The unit realizes seamless AC/DC switching and coordinated energy supply. Under normal AC input conditions, the mains supply powers all loads while intelligently floating-charging the batteries. In the event of sudden mains failure, the batteries switch to supply power within milliseconds without interruption or voltage fluctuation, ensuring continuous operation of secondary devices.
• During circuit breaker closing and tripping operations, the charging module and batteries work in parallel to release energy jointly, perfectly matching the instantaneous surge load demands of the switchgear and supporting multiple consecutive operations.

Intelligent Battery Management for Extended Service Life

• A high-end microcontroller enables intelligent battery management. The system automatically switches between floating charge and equalizing charge modes, precisely regulating charging voltage and current to prevent overcharge and undercharge, thereby slowing battery aging.
• Built-in overvoltage and undervoltage protection prevents deep discharge damage. Charging automatically resumes upon mains recovery, and depleted batteries can be fully recharged within 72 hours to restore backup capacity.

Comprehensive Protection Mechanisms

• The unit integrates both hardware and software protection logic covering all operating conditions to ensure long-term stable operation:
• AC input undervoltage protection
• DC output overvoltage / undervoltage protection
• Output overcurrent and short-circuit protection
• Battery reverse polarity protection

 Remote Intelligent Communication for Unattended Operation

Local buzzer alarms and relay dry contact outputs are provided for connection to external audible and visual alarm devices. The standard RS485 communication interface supports the universal Modbus-RTU protocol and enables Four-Remote Functions (Telemetry, Teleindication, Telecontrol and Teleadjustment). This allows remote background monitoring, parameter configuration and fault uploading, fully supporting distribution automation and unattended operation scenarios.

 Real-time Self-diagnosis for Efficient Maintenance

The system performs continuous, around-the-clock self-diagnostics, monitoring core operating data in real time, including input voltage, output status, battery parameters and device temperature. Upon detection of any abnormality, local audible and visual alarms are triggered and fault information is actively uploaded to the background system. This enables maintenance personnel to quickly locate and troubleshoot issues, significantly reducing maintenance difficulty and labor costs.

Selection Guide

Battery capacity can be flexibly selected from 12Ah to 20Ah. Choose the appropriate configuration based on actual on-site load consumption and required backup duration.

Product Summary

• The GWPS-DCD220-400W Distributed DC Power Supply System is a purpose-built, lightweight, high-reliability and cost-effective power solution for small and medium-voltage distribution sites. Featuring an embedded distributed architecture, it moves away from the bulky design of traditional centralized DC panels. No dedicated equipment room or additional civil construction is required, enabling true on-site installation and local power supply.
• The distinctive dual-power design of 200W continuous power plus 400W instantaneous surge power, combined with flexible output voltage options (DC 220V / 110V / 48V / 24V) and adjustable battery capacity (12～20Ah), precisely matches the load demands of 1～2 switchgear panels. Equipped with intelligent charge-discharge control, comprehensive fault protection, remote automated O&M and real-time self-diagnostic functions, the unit operates stably over the long term in various complex indoor and outdoor distribution environments. It serves as an ideal replacement for conventional DC panels in small RMUs and compact substations, enabling intelligent upgrades to distribution networks.