What functional constraint is indicated in the IEC 61850 object name Relay1/XCBR1$ST$Loc$stVal?

The notation "Relay1/XCBR1$ST$Loc$stVal" is derived from the IEC 61850 standard, which defines a framework for the communication of data in substations and other power systems. In this context, each component of the name represents a specific aspect of data modeling within the standard.

The component "ST" refers to the status functional constraint, indicating that the data point is focused on providing the status information of the object or system being monitored. In the case of state definitions in power systems, "ST" is commonly used to denote the status of a specific function.

Understanding this framework is crucial for interpreting object names in IEC 61850. The other components of the name--such as "Loc," which refers to location, "stVal," which indicates the status value, and "XCBR1," representing a specific circuit breaker--do not signify the functional constraint but rather characteristics or specific features of the relay or its operation. The "ST" designation is critical as it encapsulates the essence of what type of information is being represented in this portion of the object name.