Which term refers to a schematic representation of equipment connections in a power system?

The term that best describes a schematic representation of equipment connections in a power system is an electrical diagram. Electrical diagrams are essential for illustrating the arrangement and interconnections of different components within an electrical system, such as transformers, circuit breakers, and other apparatus. They provide a standardized way to communicate how systems are designed and how they function, ensuring clarity and understanding for engineers and technicians involved in the construction and maintenance of electrical systems.

The other terms, while they may seem related, do not specifically encompass the breadth of what an electrical diagram represents. A circuit blueprint typically refers to an engineering design document that may include detailed specifications but is not exclusively focused on the schematic representation. Power layout generally pertains to the physical arrangement of components within a power system rather than the schematic connections. Connection sketch, while it suggests a form of illustration, lacks the formalized standard that an electrical diagram carries in terms of industry practices. Thus, the specificity and standardization of electrical diagrams make them the correct answer for this question.