How Does a Multi-Winding Transformer Provide Power with Equal Output Voltages?

The discussion centers on understanding how a multi-winding transformer can provide power with equal output voltages, particularly in the context of an Uninterruptible Power Supply (UPS) that stopped working after a power surge. The original question highlights confusion about measuring voltage across two transformer output terminals that appear to have the same potential relative to ground, questioning how current can flow without a potential difference. Responses clarify that the transformer may be center-tapped or have multiple windings serving different purposes, such as powering control circuits or relays. Troubleshooting advice includes verifying transformer input and output voltages with a multimeter, checking for embedded thermal fuses, and inspecting thyristors on heat sinks for damage. The importance of tracing the supply to the control board and understanding the role of multiple transformers in UPS systems is emphasized. A recommended resource is a video tutorial explaining three-phase power transformers, voltage measurement methods, and current flow directions.
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