In what type of connection is a Potential Transformer (PT) typically used?

A Potential Transformer (PT) is typically used in parallel connections to step down the high voltage of electrical systems to a lower, manageable voltage suitable for measurement and control purposes. This parallel configuration allows the PT to monitor voltage levels without interrupting the flow of power in the circuit.

By operating in parallel, the PT can maintain a constant voltage ratio relative to the primary system, enabling accurate voltage readings for protective relay systems and metering applications. This approach ensures that the circuit remains operational while providing a means to analyze voltage data safely.

Other types of connections, such as series, loop, or hybrid, are not suitable for the function of a PT. In series configurations, the PT would interrupt the flow of current, which is not practical for monitoring voltage. Loop connections refer to closed circuits which are not applicable for PT usage. Hybrid connections are generally combinations of other configurations but do not directly serve the purpose of a PT, which is solely focused on voltage transformation in a parallel setup.