What are the functions of the DC screen and the AC screen?_Chuanyang Electric Co., Ltd.
What are the functions of the DC screen and the AC screen?
Date of publication: 2019-5-22
1. The charging module inside the DC screen outputs DC voltage. The main directions are: 1) Charge the battery, as a reserve power supply for the closing bus and control bus, 2) In the case of insufficient battery function, it can also be directly sent to the closing Brake bus and control bus to realize the functions of electric opening and closing comprehensive protection (alarm and temperature measurement). The advantage of direct current is that there is no clutter, relatively stable, and high reliability. The main working principles of the DC screen are as follows: 1. When the AC input is normal, when the system AC input is normal, the two AC inputs are always selected, and the two AC inputs are selected through the AC switching control board to select one of the inputs, and the AC power distribution unit is used to charge each module powered by.The three-phase AC input from the charging module is converted into 220V or 110V DC. After being isolated by the isolation diode, it charges the battery on the one hand, and powers the closing load on the other hand..In addition, the closing bus also forms a backup system through the circuit pressure silicon chain device and the control module, which provides the control bus power source..The monitoring part of the system manages and controls the system. After the signals are collected and processed by the power distribution monitoring, they are managed by the monitoring module. The man-machine interface is provided on the display screen, and it can also be connected to the remote monitoring system..The system can also be equipped with an insulation detector or insulation detection relay to monitor the insulation of the busbar.2. AC input power failure or abnormal AC power failure or abnormality, the charging module will stop working and be 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 gives an alarm.After the AC input returns to normal, the charging module will charge the battery. The AC power distribution panel is used to connect power supplies, transformers, converter equipment and other loads, and to monitor and protect the power supply system. It has the ability to connect, disconnect, and switch between the power supply and various loads to achieve the specified operation Control function equipment. Commissioning of the DC screen, connect the AC power supply to test whether the AC dual power switching device is working normally, and whether the voltage of the lower port of the dual power switching device is normal.After the AC part is tested normally, close the AC switch of the charging module in turn, observe whether the module starts normally, and measure the output voltage and polarity of the module.After the charging module starts normally and the output voltage and polarity are correct, turn on the battery pack switch and each bus switch, measure whether the voltage and polarity of the lower port of the battery pack switch, the closed bus, and the control bus are correct, and observe whether the voltmeter is turned on. turn.You may be interested in DC screen: DC screen wiring diagram collection of buried transformer foundation diagram collection of main technical parameters of buried transformer landscape performance characteristics of buried transformer factors that need to be considered when selecting a DC screen
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