Fault type analysis of frequency converter in electrical industry

In low-voltage electrical appliances. The development of frequency converters is changing with each passing day. The increase in power demand, the replacement of old-fashioned transformers and environmental protection factors are the main reasons for the growth of the global voltage equipment market, especially in China and India. On the other hand, the development of the transformer market is also facing many challenges, such as the increase in raw material prices and strict environmental protection requirements. These restrictions have forced companies to pay more attention to the development of advanced transmission technologies, both to meet transmission capacity and to meet existing and future environmental standards.

There are many occurrences of soft faults in the inverter, which is one of the faults that are common in the operation of various types of inverters. So how do we reduce the occurrence of soft faults in the inverter? This is a problem that all inverter manufacturers and users are very concerned about. The methods for reducing the soft fault of the inverter are as follows: 1. Detecting overvoltage and undervoltage of the inverter; 2. Detecting overcurrent is the most frequent phenomenon of frequency conversion alarm. Usually, overvoltage alarms generally occur when the machine is stopped. The main reason is that the deceleration time is too short or the braking resistor and the brake unit have problems. Undervoltage is also a problem we often encounter in use. Mainly because the main circuit voltage is too low (220V series is lower than 200V, 380V series is lower than 400V), the main reason: a certain damage of the rectifier bridge or abnormal operation of the thyristor three-way may cause undervoltage faults. When the second main circuit contactor is damaged, the DC bus voltage loss may cause undervoltage on the charging resistor. There is also a problem that the voltage detection circuit is faulty and undervoltage occurs.

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