Basic knowledge of photovoltaic power generation

Photovoltaic power station fault prevention and treatment

  1. Emergency lighting switching test
    • Emergency lighting switching test refers to the switching test work carried out by operation and maintenance personnel on emergency lighting on a regular basis to verify that emergency lighting can be reliably put into use when needed. (1) Check that the accident lighting is in normal condition, and the signal indication and power supply should be switched automatically. (2) After switching the accident light on for 3-5 minutes, there should be no abnormality observed.
  2. Check discharge and charge test of valve-regulated battery
    • The check discharge and charge test of valve-regulated battery refers to checking the capacity of the battery to ensure the long-term stable and reliable operation of the battery pack, and to find out the aging battery and carry out maintenance and replacement. The operation and maintenance personnel regularly check the battery pack. Carry out the work of checking the discharge and charging. (1) Strictly control the charge and discharge current and battery terminal voltage to prevent the battery from bursting or the release valve from opening, and prevent overcharging and overdischarging. (2) If the charging capacity does not reach the rated capacity, perform the check-discharge and charge again, and check the charge-discharge for a maximum of three times. If the three-time charge and discharge fail to reach 80% of the rated capacity, the capacity of the battery pack can be considered unqualified. (3) Prevent the short circuit, open circuit and grounding of the DC system, and prevent misoperation and accidental touch.
  3. Battery cell voltage measurement
    • Battery cell voltage measurement refers to the timely detection of low battery cell voltage and abnormal conditions such as deformation, protrusion, leakage, rupture and explosion in order to ensure the stability and reliability of the DC system operation. Maintenance personnel regularly conduct visual inspection and voltage measurement of battery cells. (1) Measure that the voltage of the battery pack is normal, the voltage of the DC bus is normal, the voltage of the charger is normal, the state of the DC charging system is normal, and the running indicator is normal. (2) Observe that there is no deformation, protrusion, liquid leakage, rupture, scorching, and no oxide leakage at the screw connection. Each positive and negative connector is firm, without deformation, the connecting cable is not damaged, the appearance is good, and the marking is clear. (3) Do not cause short circuit between batteries during measurement. (4) The temperature of the battery room should be kept between 5-35 °C. If the room temperature is not within this range, use an air conditioner for auxiliary temperature adjustment.
  4. Inspection and requirements of safety tools
    • Regular inspection, testing and supplementation of safety tools are of great significance in safe production. See Table 5-3 to Table 5-16 for the specific test items, cycles and requirements of different safety tools.
  5. Annual inspection of fire-fighting equipment
    • The annual inspection of fire-fighting equipment is to ensure that the fire-fighting equipment can meet the standard of use, and can be put into use reliably and effectively when there is a fire. 5-17).
    • Fire extinguishers with one of the following conditions should be scrapped: (1) The simplified version is severely corroded, the rusted area is greater than or equal to 1/3 of the total area of ​​the simplified version, and there are pits on the surface. (2) The simplified structure is obviously deformed and the mechanical damage is serious. (3) There are cracks in the head and no pressure relief mechanism. (4) Simplified structures such as flat bottom are unreasonable. (5) Portable type without intermittent spray mechanism. (6) There is no name of the manufacturer and the date of manufacture, including the nameplate falling off, or although there is a nameplate, the name of the manufacturer cannot be seen clearly, or the steel stamp of the date of manufacture cannot be identified. (7) The simplified version has repair traces such as soldering, brazing or patching. (8) was burned by fire. Fire extinguishers should be scrapped when the ex-factory time reaches or exceeds the scrapping period specified in Table 5-18.
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5-17Fire Extinguisher Maintenance Rules
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