A wiring diagram typically shows the flow and distribution of electrical energy, but it doesn't include details about control, monitoring, measurement, indication, or protection of the circuit. The type of wiring diagram that focuses on these functions—such as control, monitoring, measurement, and protection—is known as a **secondary wiring diagram** or **secondary circuit diagram**. Components connected to this secondary system are referred to as **secondary devices** or **secondary components**.
These diagrams are essential for understanding how various parts of an electrical system interact beyond just power delivery. They provide a clearer view of how signals and data are managed within the system. For example, they show how instruments like ammeters, relays, and meters are connected and function within the circuit.
In a secondary wiring diagram, only specific components, parameters, or functions are represented. This simplification helps in reading and interpreting the diagram more easily. Figure 1-10 illustrates the secondary wiring diagram for the current measurement of the **current transformer (1TA)** in the power input unit shown in Figure 1-9. The **ammeter (PA)** in the diagram is a secondary component used to display the current flowing through the three-phase lines.
Such diagrams play a crucial role in electrical engineering, especially when designing, maintaining, or troubleshooting complex systems. They help engineers and technicians understand not just where the electricity is going, but also how the system is monitored, controlled, and protected.
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