Power supply anomalies are roughly divided into the following three types, namely, phase loss, low voltage, power failure, and sometimes their mixed form. The main cause of these anomalies is mostly caused by wind, snow, and lightning strikes, and sometimes due to short-circuit to ground and phase-to-phase short circuit in the same power supply system. Lightning strikes vary greatly by region and season. In addition to voltage fluctuations, some power grids or units that generate electricity by themselves will also experience frequency fluctuations, and these phenomena sometimes appear repeatedly in a short period of time. In order to ensure the normal operation of the equipment, the power supply of the inverter is also required.
If there is a motor and induction cooker directly activated in the vicinity, in order to prevent the voltage drop caused by the input of these devices, the power supply should be separated from the power supply of the inverter to reduce the mutual influence.
For equipment that can continue to operate after an instantaneous power failure, in addition to selecting the inverter at the appropriate price, the speed reduction ratio of the motor load should also be considered in advance. When both the inverter and the external control loop adopt the instantaneous power failure compensation mode, after the loss of pressure is restored, the overspeed of the acceleration is prevented by the speed measurement of the speed measuring motor.
For equipment that requires continuous operation, an automatic uninterruptible power supply unit with automatic switching should be installed. Like a frequency converter with a diode input and a single-phase control power supply, although it is in a phase loss state, it can continue to work, but the individual device current in the rectifier is too large, and the pulse current of the capacitor is too large. The longevity and reliability of the device have an adverse effect and should be checked and processed as soon as possible.
The surge voltage formed by lightning strikes or induced lightning strikes sometimes causes damage to the inverter. In addition, when the power system has a vacuum circuit breaker on the primary side, short circuit opening and closing will generate a high surge voltage. In order to prevent overvoltage damage caused by the surge voltage, it is usually necessary to apply a absorbing device such as a varistor at the input end of the inverter. The HV surge absorber should be added to the vacuum circuit breaker. If there is a vacuum circuit breaker on the primary side of the transformer, the inverter should be disconnected before the vacuum circuit breaker is operated.
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