Why the Transformer-less UPS systems should not be fed from same up stream source with other Transformer-based UPS systems:

Transformer-less UPS systems differ from transformer-based UPS systems in terms of how they operate and handle the incoming power source. The main reason transformer-less UPS units should not be fed from the same source as transformer-based UPS systems is due to potential differences in their electrical characteristics and design.

Different characteristics to function:

1. Transformer-less UPS systems typically operate with a different internal voltage and frequency range reference to the ground than transformer-based UPS systems. When connected to the same power source, there could be issues with mismatched functions, leading to improper functioning or even damage to the UPS equipment.
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Isolation and Grounding:

1. Transformer-based UPS units provide electrical isolation between the input and output, which means that there is no direct electrical connection between the two sides. Transformer-less UPS systems, on the other hand, do not have this isolation and often have a common ground. Mixing these two types of UPS systems on the same source can create grounding issues and result in potential safety hazards.
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Harmonics and Distortions:

1. Transformer-less UPS systems usually generate different or less harmonics and electrical distortions compared to transformer-based units. Feeding them from the same power source can amplify the induced harmonics from Transformer based to transformer-less and causing misfunction or damaging to the unit.
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Fault Currents and Protection Coordination:

1. In the event of a fault or electrical overload, transformer-less UPS systems may have different fault current levels and protection coordination characteristics compared to transformer-based systems. This can lead to difficulties in coordinating protective devices, increasing the risk of failure or malfunctions.
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To ensure safe and reliable operation, it is generally recommended to keep transformer-less UPS systems and transformer-based UPS systems on separate power sources. If both types of UPS units are necessary in a facility, they should be installed with proper isolation and consideration of their electrical characteristics to prevent any compatibility issues. Consulting with a qualified electrical engineer or UPS system expert can help ensure the correct setup and safe operation of the UPS systems in such scenarios.

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