When the distribution transformer capacity exceeds 500KVA, or the distribution transformer capacity is greater than 10 times of the inverter capacity, an AC reactor should be installed between the transformer and the inverter. The above paragraph is often seen on the Internet, I have been engaged in Unclear the reason why the inverter rectification will be damaged, and why it is ok, the teacher can explain it in principle, thank you very much!!!“When the distribution transformer capacity is greater than 10 times of the inverter capacity, an AC reactor should be installed between the transformer and the inverter!!!†1. The inverter is DC-powered by rectification capacitor filtering; 2. The rectifier is always in communication. When the voltage reaches the maximum value, the current is pulse current; 3. If the capacity of the transformer is large, the influence of the pulse current on the transformer can be neglected; 4. If the capacity of the transformer is small, the influence of the pulse current on the transformer cannot be Ignore, causing harmonic interference to other equipment on the same network; 5, this is to add the input reactor, it can smooth this pulse current, can also block the harmonic interference, reduce the harmonics of other equipment on the same network Wave interference!
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