Guess substation structure

The Substation element is considered optional and is often absent in what are referred to as "bottom-up" projects. However, in OpenSCD, you have the ability to add the Substation element retrospectively.

To facilitate this process, OpenSCD introduces the guess function, which aims to expedite the task or provide beginners with guidance on what to do next.

Note: The accuracy of the guess function is not guaranteed, as it relies on assumptions (see below) that may not always align with the IEDs present in the SCL file. Nevertheless, feel free to try it out, as you can always undo changes if needed.

Here's how you can utilize the function:

• Open an SCL file with a missing Substation or delete all existing Substation elements.
• Click on the fab button +Add Substation.
• In the dialog Add Substation, check the box Guess content.
• Choose the (ctlModel) (Control model) that identifies your switchgear in the IED.
• Start the GUESS CONTENT process.

NOTE: The primary challenge with the guess function lies in accurately identifying the quantity of voltage levels (VoltageLevel), bays (Bay), and conducting equipment or primary equipment (ConductingEquipment).

Therefore, we need to rely on some basic assumptions, which are as follows:

• We assume the presence of only one voltage level.
• Bays are identified using the logical node CSWI. This means that if there is at least one logical node CSWI present, and its mandatory data object Pos matches the chosen control model (ctlModel), a bay is created for that particular IED.
• Each logical node CSWI with a matching ctlModel represents a conducting equipment. If a XCBR is connected to it (with the same prefix and inst in the same LDevice), the conducting equipment type is classified as CBR; otherwise, it is classified as DIS.
• Logical node connections (LNode) are automatically assigned to the conducting equipment. Ideally, this includes the CSWI, a XCBR or XSWI, and CILO.

TIP: The assumption that there is only one voltage level may not hold true for large files with numerous IEDs. In such cases, utilize the Move function to allocate bays to other voltage levels as needed.