High-voltage inverter maintenance

Inverter general installation environment requirements: minimum ambient temperature -5 °C, maximum ambient temperature 40 °C. A large number of studies have shown that the failure rate of the inverter rises exponentially with increasing temperature, and the service life decreases exponentially with increasing temperature. When the ambient temperature rises by 10°C, the service life of the inverter will be reduced by half. In addition, the operation of the inverter is good and has a great relationship with the degree of environmental cleanliness. In the summer, it is the frequent occurrence period of the inverter fault. Only through good maintenance and maintenance can the equipment failure be reduced. Please pay attention to the user's attention to the temperature of the inverter installation environment in the maintenance of high-voltage inverter in summer, and regularly clean the inverter. Internal dust ensures smooth cooling air ducts. Strengthen inspections to improve the surrounding environment of inverters, motors and lines. Check whether the terminal blocks are fastened to ensure the correct and reliable connection of each electrical circuit and prevent unnecessary shutdown accidents.

First, daily inspection need to pay attention to matters 1, carefully monitor and record the inverter man-machine interface on the display parameters, found that the abnormal should be immediately reflected 2, carefully monitor and record the temperature of the inverter room environment, the ambient temperature should be -5 °C ~ Between 40 °C. Temperature rise of phase-shifting transformers cannot exceed 130°C

3. When the summer temperature is high, the ventilation and heat dissipation at the installation site of the inverter shall be strengthened. Ensure that the surrounding air does not contain excessive amounts of dust, acids, salts, corrosive and explosive gases. 4. In summer, it is a rainy season. Prevent rainwater from entering the inverter (for example, enter the outlet of a rainy air outlet).

5. The filter on the frequency converter cabinet door should normally be cleaned once a week; if the working environment has more dust, the cleaning interval should also be shortened according to the actual situation. 6. In the normal operation of the inverter, a standard thickness of A4 paper should be able to be strong Adsorption on the door inlet filter net 7, frequency conversion room must be kept clean and tidy, should be cleaned at any time according to the actual situation at the scene.

8. The ventilation and lighting of the frequency conversion room must be good. The ventilation and heat dissipation equipment (air conditioner, ventilation fan, etc.) can be operated normally. 2. The items needing maintenance after the inverter is shut down. 1. Thoroughly clean the inside and outside of the inverter cabinet with a vacuum cleaner with a plastic nozzle. Ensure that there is no excess dust around the equipment.

2. Check the ventilation and lighting equipment of the inverter room to ensure that the ventilation equipment can operate normally.

3. Check that the connection between the internal cables of the inverter should be correct and reliable. 4. Check that all the grounding in the inverter cabinet should be reliable and that the grounding points should not be rusted. 5. Each time the internal cable of the inverter should be fastened once every six months (inside). The connection nut 6 and the inverter shall resume operation after a long shutdown. The insulation of the inverter (including the phase-shifting transformer and the main circuit of the bypass cabinet) shall be measured. The 2500V megohmmeter shall be used. After passing the test insulation, it can start the inverter 7, check the tightness of all electrical connections, check whether there are abnormal discharge traces on each circuit, whether there is strange smell, discoloration, cracks, breakage, etc. 8. After each maintenance of the inverter , to carefully check for missing screws and wires, etc., to prevent short circuit accidents caused by small metal objects. In particular, after major changes to the electrical circuit, ensure that the connection of the electrical connection is correct and reliable and prevent the occurrence of a 'reverse transmission' accident.