DZWT Type Switch Mode DC Power Supply System

Overview  

The system supplies 500kV or lower-voltage power plants, substations, industrial and mining enterprises, tall buildings, communication systems, and railway systems with uninterrupted DC power for DC operation, relay protection, signal control, and lighting. Controlled by this system, the entire DC complete system performs forced charging and equalized charging in strict accordance with the charging curve of the battery to avoid overcharging and undercharging and extend the service life of the battery. In case of fault on the control system, the DC cabinet switches to manual operation mode and gives an alarm to ensure safety and reliability of the entire system. This ideal DC cabinet smart control system can implement all requirements of the power industry.

Technical Data 

Charging module: High-frequency switch rectifier module or imported power module
Standby method: 1. For system with battery capacity larger than 200 Ah, (N1+1) + (N2+1)
                            2. For system with battery capacity smaller than 200 Ah, N1 + (N2+1); N+1
Central control system: LCD interface control, touchscreen + detection submodules, touchscreen + PLC components
Data collection: general parameter controller
Step-down device: voltage adjustor; DC/DC
MMI: LCD, touchscreen
Battery monitor: touchscreen interface, special –purpose battery detection device, PLC monitor
Temperature compensation: temperature compensation device
Circuit breaker: Siemens, etc

Configuration Rules: 

The charging / float charging device adopts multiple smart high-frequency switch mode power modules which are paralleled and work in N+1 hot standby mode. The number of smart high-frequency switch mode power modules can be determined in accordance withthe following formula (that is to determine the value N):
N × rated current of module  maximum general load + equalized charging current (meeting battery requirement)

For example, a DC system with voltage 220 VDC, battery capacity 300 Ah, and general load 5 A, the charging current is (0.1 × 300Ah) + General load (5A) = 35A. If four rectifier modules (N = 4) can meet requirements, add a standby module. A total of five power modules are connected in parallel mode to form a required system.

Optional functions:

1.Monitoring insulation of output branch

2.Monitoring ON/OFF state of output branch
3.Monitoring trip state of output branch

4.Monitoring end voltage of single battery 5.Monitoring battery capacity