UPS power supply
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When the shielding system is powered by a UPS, a parallel connection of two power sources cannot be used; however, the power supply to the UPS can be provided via a dual-circuit system
The mains power and the UPS are separate, but they are combined again after passing through a switching power supply; otherwise, how can there be power redundancy?
The uninterruptible power supply system introduces two AC 220V power supplies from high-voltage electricity to the dual-power switching distribution panel, supplying power to the online UPS system as per first-class load requirements. UPS provides redundant power supply, and the cards are also powered via dual circuits
I don’t know what the original poster means – is it a statement or a question? When mains power passes through an online UPS, a certain phase difference, that is, a voltage difference, occurs between the input and output; therefore, it is not possible to connect them in parallel. If the UPS has two input circuits, they are usually located on different busbars under the same transformer.
That’s right; the power cables feeding the UPS are on different busses. Is it possible to use different transformers for them?
Different transformers are more secure. The UPS itself can have dual input sources, and the power switching cabinet can also have dual input sources; some DCS systems can be connected to two 220V sources at the same time. So you mean that DCS cannot be connected directly to both a UPS and mains power?
The dual circuits of UPS switch automatically, right? In actual use, only one circuit of power is utilized
I’m talking about the dual-power supply for DCS. What does it mean by \"cannot be connected in parallel\" on the top floor?
Two power supplies are combined and fed into the UPS
If you have something similar to a dual-power switching switch (static transfer switch) that allows for two mains power inputs and one mains power output, when connected to a UPS, the two input sources can be on different busbars; this is because it functions in the same way as a UPS, enabling automatic switching to the other source in case one of the inputs loses power.