What type of polarity do generator step-up transformers typically have?

Generator step-up transformers typically have subtractive polarity. This means that the voltage outputs from the primary and secondary windings of the transformer are such that they oppose each other in terms of phase angle. When the transformer steps up the voltage, the output circuit connected to the secondary winding has a potential that effectively decreases when viewed in relation to the primary side, resulting in a subtractive relationship.

In practice, this is crucial for ensuring that the transformer operates correctly within the circuit, allowing for effective voltage regulation and power transfer to higher voltage transmission lines. This configuration reduces the risk of short-circuiting and enhances the overall stability of the power system by maintaining proper phase alignment between the different components of the network.

Understanding the working polarity helps engineers and technicians design and troubleshoot transformer systems for efficient energy distribution. Other polarities, such as additive or neutral, would not be appropriate in this context, as they are used in different applications that require specific phase orientation which is not typical for generator step-up transformers.