Daily operation and maintenance precautions for high-voltage inverters - Solutions - Huaqiang Electronic Network

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In the routine maintenance of the high-voltage inverter, attention should be paid to the temperature of the installation environment of the high-voltage inverter, and the internal dust of the inverter should be cleaned regularly to ensure the smoothness of the cooling air passage. Strengthen inspections to improve the surrounding environment of inverters, motors and circuits. Check that the terminals are tightened to ensure correct and reliable connection of each electrical circuit to prevent unnecessary downtime.

First, daily inspections need to pay attention to matters

1. Carefully monitor and record the display parameters on the human-machine interface of the inverter, and find that the abnormality should be reflected immediately.

2. Carefully monitor and record the ambient temperature of the inverter room. The ambient temperature should be between -5 °C and 40 °C. The temperature rise of the phase shifting transformer cannot exceed 130 °C.

3. When the summer temperature is high, the ventilation and heat dissipation of the inverter installation site should be strengthened. Ensure that the surrounding air does not contain excessive amounts of dust, acids, salts, corrosive and explosive gases.

4. Summer is a rainy season, and rainwater should be prevented from entering the inverter (for example, rainwater enters the air outlet of the air duct).

5. The filter on the inverter door should be cleaned once a week. If the working environment is dusty, the cleaning interval should be shortened according to the actual situation.

6. In the normal operation of the inverter, a standard thickness of A4 paper should be firmly adsorbed on 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 on site.

8. The ventilation and lighting of the inverter room must be good, and the ventilation and heat dissipation equipment (air conditioner, ventilation fan, etc.) can operate normally.

Second, the project needs to be maintained after the inverter stops

1. Thoroughly clean the inside and outside of the inverter cabinet with a vacuum cleaner with a plastic nozzle to ensure that there is no excessive 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 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 is no rust at the grounding point.

5. The connecting nuts of the internal cables of the inverter should be tightened once every six months.

6. When the inverter resumes operation after a long time stop, the insulation of the inverter (including the phase shift transformer and the main circuit of the bypass cabinet) should be measured. The 2500V megger should be used. The inverter can only be started after the insulation has passed the test.

7. Check the tightness of all electrical connections, check whether there are abnormal discharge marks in each circuit, whether there are strange smells, discoloration, cracks, damage and so on.

8. After each maintenance of the inverter, carefully check for missing screws and wires to prevent short-circuit accidents caused by small metal objects. In particular, after making major changes to the electrical circuit, ensure that the electrical connection is connected correctly and reliably, and prevent the occurrence of 'reverse power transmission' accidents.