Mathematically, the transformer ratio (K) can be expressed as: K=rated voltage on high voltage side/rated voltage on low voltage side.

    1. ratio=number of turns in the primary windings / number of turns in the secondary windings;

    2. ratio=input voltage / output voltage

    3. ratio=√(rated capacity of the transformer × input voltage) /output voltage 

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    3. Transformers are usually wound using iron cores in power systems. Changing the transformer ratio requires readjusting the total flux of the core. If the technology is not properly mastered, it may cause the iron core to be magnetized, thus causing safety hazards. 4. In some special situations, such as inspection and maintenance of power systems during construction, it may be necessary to change the transformer ratio to ensure better operation of the system. However, this also requires careful consideration of the impact of ratio changes on the overall stability and safety of the power system.