Operation and maintenance safety issues of photovoltaic power plants
With the wide application of photovoltaic power generation technology, photovoltaic power plants, especially distributed and rooftop photovoltaic power generation have been widely popularized. While photovoltaic power generation benefits the people, there are often reports of accidents or even accidental personal injury and major property losses caused by photovoltaic power stations. Today we will discuss the safety issues that should be paid attention to during the operation and maintenance of photovoltaic power plants.
Beware of DC high voltage
Photovoltaic power generation is a direct current power generation system. The voltage of the DC power generation part of most photovoltaic power plants is very high (600-800VDC), and the string current is usually 5-10A. The accident hazard caused by high-voltage direct current is far greater than that of alternating current of the same level. Once an electric shock accident occurs, the strong direct current voltage and current will be immediately fatal.
Therefore, operation and maintenance personnel must undergo technical training and be certified to work. Two or more people should be present for the operation and maintenance of high-voltage electrical equipment. During operation and maintenance, it is necessary to strictly abide by the operating specifications, operate with caution, prevent touching live conductors, and ensure safe production. The operation and maintenance of photovoltaic power plants must pay attention to the safety of personnel. When necessary, protective equipment such as insulating shoes, insulating gloves and safety helmets should be provided.
When overhauling, it is necessary to cut off the power supply on both sides
Remember, the photovoltaic power station is a dual power system. When the power station is repaired or troubleshooting, the grid power supply and the DC side power supply of the photovoltaic power generation should be cut off respectively. When performing circuit maintenance or troubleshooting on the DC side photovoltaic power generation string or array, the operation should be performed when the solar radiation is weak. First, cut off the AC power supply of the inverter grid, turn off the inverter, and then remove and insert the DC side. or switch operation, it is strictly forbidden to directly plug and unplug the DC connector when the inverter is running. When the sun is strong, when the direct current is operated, a serious arc will burn out the connector and even cause personal injury and fire accident.
The inverter connection operation should be operated according to the procedure of connecting AC first and then connecting to DC. When overhauling the inverter, first turn off the inverter, disconnect the AC power, and then disconnect the PV DC power supply.
Repair after the inverter is fully discharged
When overhauling the inverter, it should be noted that after the inverter is disconnected from the DC power supply, the internal capacitors of the inverter still store high power and voltage, and the DC interface of the inverter may still maintain a high storage voltage. , pay attention to prevent electric shock during operation, fully discharge, and ensure that the relevant operations can only be carried out after the internal capacitor of the inverter is discharged.
The plug needs to be reset
After the maintenance work is completed, the plug connector should be reset in place to prevent ignition caused by poor contact.
Record maintenance data
The entire process of photovoltaic power station operation and maintenance should be recorded in detail and properly kept for future operation and failure analysis
Work at heights, pay attention to safety
Safety precautions must be taken when working at heights, and seat belts must be fastened to prevent falls from heights.
After the completion of photovoltaic power plants, safety production is a very important link. Correct operation and maintenance and safety production can not only greatly improve the life of equipment and power plants, increase power generation, but also ensure the personal safety of operators. Photovoltaic power generation enterprises need to be equipped with operation and maintenance management and technical personnel, and should also strengthen the safety production and skill training and management of operation and maintenance personnel to ensure the safe, stable and efficient operation of the power station.