What does the term "PT" stand for?

The term "PT" stands for "Potential Transformer." This component is crucial in electrical systems, particularly in the context of measuring high voltages. A potential transformer is used to reduce high voltage levels to a lower, manageable level that can be safely measured and monitored by standard measuring instruments like voltmeters. The primary function of a potential transformer is to step down voltage while maintaining the same phase relationship, making it essential for protective relaying and metering applications in power systems.

The design and application of potential transformers help ensure accurate readings and the safe operation of electrical systems, particularly where high voltages are present. Understanding this concept is important for apprentice linemen, as it lays the foundation for working safely and efficiently with electrical equipment and systems.