Many people now use electricity for solar photovoltaic power generation. The use of photovoltaic power generation not only cleans and protects the environment, but also saves electricity and sells electricity to make money. We all know that photovoltaic power plants are high-quality, high-value, high-demand products. Proper use of these power plants not only ensures the power generation of the power station, but also enables them to maintain their useful life. Therefore, the maintenance of the power station after installation is particularly important. Many owners have also learned to maintain photovoltaic power plants themselves, such as the regular cleaning of birdhouse excrement, leaves and other shelters on the panel. But simply maintaining the components is not enough. Let Xiaobian explain how to systematically maintain solar photovoltaic power stations.
Grid-connected solar photovoltaic power plants are mainly composed of photovoltaic modules, photovoltaic supports, solar inverters, grid-connected distribution boxes, cables, and electric meters.
First, the maintenance of components and brackets
1. The surface of photovoltaic modules should be kept clean. Wipe the PV modules with a dry or damp, soft and clean cloth. Do not wipe the PV modules with corrosive solvents or hard objects. Photovoltaic modules should be cleaned with an irradiance of less than 200 W/m2. Liquid cleaning kits with large temperature differences between the modules should not be used.
2. Photovoltaic modules should be inspected periodically. If any of the following problems are found, the photovoltaic modules should be adjusted or replaced immediately.
Photovoltaic modules have glass comminution, backplane scorching, and obvious color changes;
There are air bubbles in the PV module that form communication channels with the edge of the module or any circuit;
The junction box of the PV module is deformed, twisted, cracked, or burned, and the connection terminals cannot be well contacted.
3. The charged warning signs on the PV modules must not be lost.
4, the use of metal frame of photovoltaic components, frame and bracket should be a good combination, the contact resistance between the two is not greater than 4Ω, the frame must be firmly grounded.
5. When working under shadowless conditions, the temperature difference between the outer surface of the same PV module (directly above the cell) should be less than 20°C when the solar irradiance is 500W/m2 or more and the wind speed is not more than 2m/s. PV power plants with installed capacity greater than 50kWp should be equipped with an infrared thermal imager to detect the temperature difference on the outer surface of the PV modules.
6. The input current of each PV module string connected to the same DC combiner box is measured under the condition that the solar radiation intensity is basically the same using a DC clamp ammeter. The deviation should not exceed 5%.
7. All the bolts, welds and brackets of the bracket should be connected firmly and reliably. The surface of the anti-corrosion coating should not appear cracking and falling off, otherwise it should not be brushed in time.
Second, the maintenance of solar inverter
1. The structure and electrical connection of the inverter should be kept intact. There should be no rust, dust, etc., the heat dissipation environment should be good, and the inverter should not have large vibration and abnormal noise during operation.
2. The warning signs on the inverter should be intact without damage.
3. The functions of the cooling fan of the module, reactor and transformer in the inverter should be started and stopped automatically according to the temperature. When the cooling fan is running, there should not be large vibration and abnormal noise. If there is any abnormality, the power should be turned off for inspection.
4. Periodically disconnect the circuit breaker on the AC output side (network side), and the inverter shall immediately stop feeding power to the grid.
5. The DC bus capacitor temperature in the inverter is too high or exceeds the service life and should be replaced in time.
Third, the maintenance of the distribution box
1. There must be no distortion, corrosion, water leakage or dust accumulation in the distribution box. The security warning signs on the outer surface of the box should be intact without damage. The waterproof lock on the box should be opened flexibly.
2. Each terminal in the distribution box should not be loose or rusted.
3. The insulation resistance of the positive pole to the ground and the negative pole of the output bus should be greater than 2 megohms.
4. The connection between the DC input interface of the distribution box and the combiner box should be stable and reliable.
5. The connection between the DC output of the distribution box and the DC input of the grid-connected host should be stable and reliable.
6. The DC breaker of the distribution box should be flexible and the performance should be stable and reliable.
7. The lightning arrester configured on the output side of the busbar should be effective.
Four, connecting cables and grounding between devices
1. The cable should not be operated under overload conditions. The lead package of the cable should not be expanded or cracked.
2. The location of the cable at the entrance to and exit from the equipment should be properly sealed. Holes with a diameter greater than 10 mm should not exist, otherwise they will be blocked with a fire blocking mud wall.
3, in the cable to the device shell pressure, tension is too large, the cable support point should be intact.
4, cable protection pipe mouth should not have perforation, cracks and significant uneven, the inner wall should be smooth, metal cable pipe should not have serious corrosion, there should be no burrs, hard objects, garbage, if any burr, after the cable with light Coat and tighten.
5. The accumulation of debris and garbage in the outdoor cable wells should be cleared in time. If the cables are damaged, they should be disposed of.
6. When inspecting the open drain of the indoor cable, it is necessary to prevent damage to the cable and ensure that the support is grounded and the heat dissipation in the trench is good.
7. The buried piles along the cable route shall be intact and there shall be no excavation on the ground near the path to ensure that there are no heavy objects, building materials and temporary facilities on the ground along the path, no corrosive substances are discharged, and the outdoor ground cable protection facilities are in good condition.
8. Ensure that the cover of the cable trench or cable well is intact and there should be no accumulation of water or debris in the channel to ensure that the bracket in the trench should be firm, with or without rust, looseness, and the sheath and armor of armored cable should not be severe. Corrosion.
9. For multiple parallel-laying cables, check the current distribution and the temperature of the cable jacket to prevent the cable from burning out the connection points due to poor contact.
10. Make sure that the cable terminal is well grounded, the insulation bushing is in good condition, clean, and there is no trace of flashover discharge, ensuring that the cable phase contrast should be obvious. When carrying out maintenance, insulation gloves must be worn and the operating tools used are manufactured by regular manufacturers.
11. It must be ensured that the equipment room is clean, dry, and ventilated; flammable and explosive materials cannot be allowed to be placed in the equipment room.
12, can not allow non-workers to operate the instrument, open the instrument, modify the instrument parameters.
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