The DC power supply is a device that can form a constant current in the circuit. The DC power supply has positive and negative electrodes. The positive electrode has a high potential and the negative electrode has a low potential. When the two electrodes are connected to the circuit, the DC power supply can maintain both electrodes. The constant potential difference between the two, so as to form a constant current from the positive pole to the negative pole in the external circuit.
Application range of DC power supply: DC power supply system is suitable for large power plants, hydropower plants, ultra-high voltage substations, unattended substations as control, signal, protection, automatic reclosing operation, emergency lighting, DC oil pump, various DC operating mechanisms Switching on and off, secondary circuit instrumentation, automatic device control AC uninterrupted power supply and other power supply devices such as DC power supply.
Single-line principle of DC power supply: DC power supply consists of four units: charging screen, feeder screen, storage battery and DC voltage converter. The charger screen is composed of several power modules and a microcomputer monitoring system. The maximum configuration of a single cabinet (screen) is 160A. If more output current is required, multiple cabinets (screens) can be connected in parallel. The feeder screen is equipped with a microcomputer insulation on-line monitoring device. When a grounding accident occurs in a feeder branch, it can display the branch number and ground resistance of a certain branch. The battery screen can be equipped with a microcomputer battery inspection device to monitor the battery status at any time. The DC voltage transmitter can be a high-frequency DC transmitter. When the voltage of the closing bus changes from 180 to 300V, the output voltage of the control line bus can be firmly stabilized at 220V.
