Help~ Reasons for the inverter stopping due to thunderstorms and solutions
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A few days ago, during thunderstorms, most of the equipment with frequency converters in the factory building stopped operating. To prevent similar incidents in the future, repairs are being carried out now. I was wondering: since there is lightning protection grounding for thunderstorms, why does the system still shut down, and why is it the inverter that shuts down? Someone suggested adding a UPS, but even a UPS has a response time, and during that time the device will still shut down. Please help analyze it.
For this sea user, such problems and faults are quite complex and highly random. Generally, thunderstorms can cause fluctuations in the power supply voltage of the inverter, triggering its voltage protection mechanism and resulting in the inverter tripping. Typically, we opt to use inverters with dynamic buffering capabilities (brands such as the ABB 800 series or Fuji inverters offer this feature) to provide short-term protection against voltage spikes; however, this protection lasts only about 100–200 milliseconds, and it is not possible to avoid voltage fluctuations over longer periods of time. Additionally, in actual production, UPS power supply is also used, especially for critical equipment in the facility – as a failure of the frequency converter can lead to unplanned shutdowns of the facility. Although using UPS does require significant investment, factories generally approach this approach with great caution ； There is another approach, which involves using a DC bus for power supply; in this case, the DC output bus of the inverter is equipped with parallel batteries or high-capacity capacitors. This helps to prevent issues such as voltage fluctuations, thereby ensuring the reliable operation of the inverter. I disagree with the explanation given on the second floor. Lightning protection is primarily intended to safeguard inverter equipment; if lightning protection fails (meaning that lightning overvoltage cannot be discharged in time), then the inverter itself is on the verge of failing!
Thank you. I’ve been considering adding surge protectors recently; I’m not sure how effective they will be