Which characteristic signifies an additive transformer?

The characteristic that signifies an additive transformer is that it is rated at 200kVA or below. Additive transformers are typically used in distribution applications where smaller power ratings are common. These transformers are designed to provide an additive voltage output that combines the effects of the two coils, which can be beneficial in specific circuit configurations.

The rating of 200kVA or below indicates that the transformer is intended for lower power applications, aligning with the typical use cases for additive transformers, which are often employed in scenarios requiring lower voltages and specific phase relationships between the primary and secondary windings.

For broader context, an additive transformer possesses windings that are configured in a manner that results in their outputs being summed together, making it suitable for applications such as supplying power to specific equipment needing a precise voltage. Understanding the power rating helps to distinguish these transformers from their more complex counterparts, which may have higher voltage and power ratings, thus clarifying their intended use.