Is modular UPS reliable without isolation transformer?

2025-03-21

Due to the limitations of circuit topology and early power devices, traditional power frequency UPS needs to have a built-in transformer at the output end to boost the voltage in order to reach the working voltage required by the load. At the same time, the transformer at the output end can also buffer the impact of the load on the UPS to a certain extent. It is equivalent to the isolation transformer forming an extra layer of isolation for the system. In today's modular UPS, the power module is generally equipped with fuses at the input/output, and the output is also isolated by relays, which can play the same role as the isolation transformer of the power frequency machine. At the same time, once the power module fails, the DSP can respond quickly and isolate the faulty module from the system. Therefore, the modular UPS will not reduce the reliability of the system due to the lack of isolation transformer. On the contrary, the isolation transformer of the traditional power frequency machine is increasingly difficult to adapt to the needs of new data centers such as high-density, high-efficiency, and flexible installation due to factors such as large size and heavy weight. At the same time, the loss of the transformer itself will not only reduce the efficiency of the system, but also generate a lot of heat, shortening the life of the internal components of the UPS.
Except for some special scenarios, the scenarios where isolation transformers are needed are becoming fewer and fewer.

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Is modular UPS reliable without isolation transformer?

2025-03-21

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Is modular UPS reliable without isolation transformer?