Precautions for maintenance of high-voltage inverters
1. Carefully monitor and record the display parameters on the man-machine interface of the inverter, and reflect the abnormality immediately
2. Carefully monitor and record the ambient temperature of the inverter room, and the ambient temperature should be between -5 °C and 40 °C. The temperature rise of the phase-shifting transformer should not exceed 130°C
3. When the temperature is high in summer, the ventilation and heat dissipation of the inverter installation site should be strengthened. Ensure that the ambient air is free of excessive amounts of dust, acids, salts, corrosive and explosive gases
4. Summer is the rainy season, and rainwater should be prevented from entering the inverter (such as rainwater entering the air outlet along the air channel)
5. The filter screen on the inverter cabinet door should usually be cleaned once a week; If the working environment is dusty, the cleaning interval should also be shortened according to the actual situation
6. During the normal operation of the inverter, a piece of A4 paper of standard thickness should be firmly adsorbed on the filter screen of the air inlet of the cabinet door
7. The frequency conversion room must be kept clean and tidy, and should be cleaned at any time according to the actual situation of the site.
8. The ventilation and lighting of the inverter room must be good, and the ventilation and heat dissipation equipment (air conditioning, ventilation fan, etc.) can operate normally.
High voltage drive maintenance project
1. Use a vacuum cleaner with a plastic nozzle to thoroughly clean the inside and outside of the inverter cabinet to ensure that there is no excessive dust around the equipment.
2. Check the ventilation and lighting equipment of the frequency conversion 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 grounding in the inverter cabinet should be reliable, and there should be no rust at the grounding point
5. Every six months (within that), the connecting nuts of the internal cables of the inverter should be tightened again
6. When the inverter resumes operation after a long time of shutdown, the insulation of the inverter (including the main circuit of the phase-shifting transformer and bypass cabinet) should be measured, and a 2500V megohmmeter should be used. After the insulation test is qualified, the inverter can be started
7. Check the tightness of all electrical connections, check whether there are abnormal discharge traces in each circuit, whether there is any strange smell, discoloration, cracks, damage and other phenomena
8. After each maintenance of the inverter, it is necessary to carefully check whether there are any missing screws and wires to prevent the inverter from short-circuit accidents caused by small metal objects. In particular, after major changes are made to the electrical circuit, ensure that the connection of the electrical connection line is correct and reliable, and prevent the occurrence of the 'reverse power transmission' accident.
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