1 In order to prevent the surge voltage from damaging the inverter, a varistor can be added to the input end of the inverter, and the withstand voltage should be lower than the withstand voltage of the power module. To protect the components from being broken down.
2 Use a circuit breaker that generates low surge voltage and use a varistor at the same time.
3 When the transformer is disconnected once, it can be controlled by the program to make the inverter disconnect in advance. At the same time, the relevant varistor protection should be added to calculate the resistance value by exciting the stored energy. In addition, lightning arresters and fuses for the main circuit should use special specifications.
At the same time, in the frequency converter, there is generally a lightning absorption network, which mainly prevents instantaneous lightning intrusion and damages the frequency converter. In actual work, especially when the power line is introduced overhead, the absorption network of the inverter alone cannot meet the requirements. In areas where lightning is active, this problem is particularly important. If the power supply is overhead, the inverter should be installed at the incoming line (optional), or the steel pipe should be pre-buried at a distance of 20m from the inverter according to the specifications. Ground protection. If the power supply is a cable entry, the lightning protection system of the control room should be well protected against lightning damage.
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