A "tapped winding" in a transformer refers to a winding within the transformer's primary or secondary coil that has multiple taps or connection points along its length. These taps allow the transformer to have adjustable turns ratios, which in turn enable the adjustment of voltage levels.
In a typical transformer, the primary and secondary windings have a specific ratio of turns, which determines the voltage transformation between the primary and secondary sides. However, in transformers with tapped windings, additional connection points are added to one of the windings, typically the high-voltage side (primary) or low-voltage side (secondary). These taps allow for multiple voltage ratios to be achieved without changing the physical configuration of the transformer.
Tapped windings offer several advantages and applications:
Voltage Regulation: By changing the tap connection, you can adjust the output voltage to compensate for variations in the input voltage or load conditions. This is particularly useful for maintaining a stable voltage level in power distribution networks.
Voltage Adjustment: Tapped windings are used to provide a range of output voltages for different applications, such as in power supply systems or voltage-sensitive equipment.
Voltage Transformation: In some cases, tapped windings can be used to provide multiple secondary voltages for different loads while maintaining a single primary voltage.
Voltage Boost/Reduction: Tapped windings can be used to provide voltage boosting or reduction, depending on the configuration and tap settings.
Tapped windings are often found in power distribution transformers, where they allow utilities to adjust the output voltage to meet specific needs and compensate for varying line conditions. They are also used in specialized applications like voltage regulators and some types of autotransformers.
It's important to note that manipulating tap connections can affect the performance and characteristics of the transformer, and it should be done carefully and within the manufacturer's specified limits.