Working principle of dc screen_chuanyang electric Co., ltd.
Working principle of DC screen
Date of publication: 2019-6-10
1. When the AC input is normal, when the AC input of the system is normal, and when the two ACs are normal, the two AC inputs select one input through the AC switching control panel, and power each charging module through the AC power distribution unit, and the charging module inputs three-phase AC power conversion It is 220V or 110V direct current, isolated by the isolation diode, on the one hand, it charges the battery and on the other hand supplies power to the closing load. In addition, the closing bus also forms a backup system through the circuit voltage silicon chain device and the control module to provide the control bus power. The monitoring part of the system manages and controls the system. After the signal is collected and processed by the power distribution monitoring, it is managed by the monitoring module. The man-machine interface is provided on the display screen and can be connected to the remote monitoring system. The system can also be configured. Insulation detector or insulation detection relay to monitor the insulation of the busbar.2. When the AC input fails or is abnormal, the charging module stops working and is powered by the battery. The monitoring module monitors the battery voltage and discharge time. When the battery is discharged to a certain level, the monitoring module alarms. After the AC input returns to normal, charge The module charges the battery again.The power operating power in power plants and substations are all DC power supplies, and the DC panel is used to supply this DC power supply. It provides power for control loads, power loads, and DC accident lighting loads. It is the contemporary power system control The basis of protection, DC screen. In short, DC screen is an ideal battery DC power supply screen. It has the output characteristics of large energy, small size, stable voltage, and ultra-low internal resistance. It can withstand strong impulse current and has a long service life. It is safe to use, non-corrosive gas, no need to install battery room auxiliary maintenance equipment, and can be installed in the same control room as other control equipment, which can save a lot of infrastructure investment. It is mainly used in substations, substations, and power plants as DC control Protect the power supply, the operating power supply of the electromagnetic operating mechanism.You may be interested: DC screen wiring diagram collection of buried transformer basic diagram collection of DC screen factors to be considered when selecting the type of buried transformer main technical parameters table of landscape buried transformer performance characteristics how to solve the buried transformer Heat dissipation problem
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