In a high-voltage diesel generator set, the DC panel is a core DC power supply device that ensures the uninterrupted operation of key links such as high-voltage switch operation, relay protection, and automatic control. Its core function is to provide stable and reliable DC power for operation, control, and emergency backup, thus ensuring the safe, stable, and continuous power supply of the generator set under various working conditions. The specific functions and working modes are as follows:
Core Functions
- Power Supply for High-Voltage Switch Operation
It provides DC110V/220V operating power for the closing and opening mechanisms (electromagnetic or spring energy storage type) of high-voltage switchgear, meets the large current demand during instant closing, and ensures the reliable operation and state maintenance of switches.
- Power Supply for Control and Protection
It provides stable DC control power for relay protection devices, integrated protectors, measurement and control instruments, indicator lights, etc., ensures that the protection system acts quickly and correctly in case of faults, and avoids malfunction or refusal to operate.
- Uninterrupted Backup Power Supply
Built-in battery pack enables seamless switch to DC power supply when AC power supply of mains or generator set fails, maintains the operation of control, protection, and key operation circuits, prevents tripping or out-of-control caused by power failure, and ensures the continuity of power supply.
- Power Supply for Emergency Lighting and Auxiliary Equipment
It provides backup power for emergency lighting and emergency indicators inside high-voltage cabinets and in the machine room, ensuring personnel safety and equipment operation environment in case of faults or power outages.
- Intelligent Monitoring and Management
Integrated with charging modules, battery inspection, insulation monitoring, fault diagnosis, and remote communication functions, it monitors voltage, current, and insulation status in real time, warns of abnormalities and automatically handles them, improving system reliability and maintenance efficiency.
Working Modes
| Mode | Power Supply Path | Core Features |
| Normal Mode | AC input → Charging module rectification → DC power supply (closing/control load) + Battery floating charge | Automatic switching of dual AC circuits, voltage stabilization and current limiting, maintaining full charge of batteries |
| Emergency Mode | Battery pack → DC power supply unit → Key loads | Millisecond-level switching when AC power fails, uninterrupted power supply, and automatic recharging after power recovery |
Key Significance
- Ensures the reliable closing and opening of high-voltage switches, avoiding power supply interruption or equipment damage caused by operation failure.
- Ensures the correct operation of the protection system in case of faults, prevents the expansion of accidents, and protects the safety of generator sets and power grids.
- Provides uninterrupted backup power supply, improves the power supply reliability of the generator set when mains voltage fluctuates or fails, and meets the continuous power supply demand of high-demand loads (such as data centers, hospitals, industrial production lines).
Key Points for Selection and Maintenance
- Select the capacity of DC panel and battery configuration according to the number of high-voltage cabinets, type of operating mechanism, capacity of control load, and backup time.
- Regularly inspect the status of charging modules and batteries, insulation level, and monitoring functions to ensure that the system is in a good standby state.
Post time: Jan-20-2026
