Maintenance and repair of DC power supply system

The main components that cause faults in the DC power supply system are the charging device and battery. There are a large number of semiconductor components inside the charging device, which are easily affected by environmental and temperature factors. In severe cases, they may even break down or burn down the equipment. If there is a significant difference in the technical parameters of two or more charging devices with parallel connections within the DC system, it will affect the occurrence rate of circulating current problems and restrict the operational performance of the charging devices and batteries. In view of this, the operation and maintenance personnel of the distribution equipment need to regularly inspect and maintain lead-acid batteries to ensure the safety and stability of the DC system. In addition, it is necessary to regularly inspect the output voltage value and the input mode of the high-frequency switch rectifier module to ensure that it meets the relevant technical indicators.

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1. Operation and maintenance of DC power supply system

The main components that cause faults in the DC power supply system are the charging device and battery. There are a large number of semiconductor components inside the charging device, which are easily affected by environmental and temperature factors. In severe cases, they may even break down or burn down the equipment. If there is a significant difference in the technical parameters of two or more charging devices with parallel connections within the DC system, it will affect the occurrence rate of circulating current problems and restrict the operational performance of the charging devices and batteries. In view of this, the operation and maintenance personnel of the distribution equipment need to regularly inspect and maintain lead-acid batteries to ensure the safety and stability of the DC system. In addition, it is necessary to regularly inspect the output voltage value and the input mode of the high-frequency switch rectifier module to ensure that it meets the relevant technical indicators.

2 Charging device and battery

Generally speaking, DC systems have two charging devices that can be rotated for use. Because the two charging devices are connected in parallel, when one of them fails and cannot be used normally, the other will take over and continue to work, providing continuous power support for the switch rectifier to improve the safety and stability of the DC system operation. At present, most of the batteries used in China's distribution system are lead-acid batteries, which have advantages such as high cost-effectiveness, large capacity, and long service life. If the battery's energy reserve is insufficient, the battery needs to rely on rectifier devices to provide charging support and ensure sufficient energy reserve. If the AC power supply is interrupted, the voltage of the battery needs to be controlled through a power electronic transformer device to ensure the normal power supply of the busbar.