Terminal in CIM vs DistributionBus in GDM#

Figure below shows an UML diagram for Terminal and ConnectivityNode in Common Information Model (CIM) which is used to connect terminals of ac conducting equipment which is analogous to DistributionBus in grid data models. The CIM diagram is accessed from here.. Terminal class inherits from IdentifiedObject class which has name, description and mrid. IdentifiedObject.mrid is analogous to ComponentWithQuantities.uuid. Note in GDM we also have system_uuid to sort of manage which system these assets belong to. Also DistributionBus has coordinate attribute of type Location which is equivalent to PositionPoint in CIM.

GDM

CIM

Note

ComponentWithQuantities.name

cim:IdentifiedObject.name

Both of them are string.

ComponentWithQuantities.uuid

cim:IdentifiedObject.mrid

Unique identifier for the component.

ComponentWithQuantities.system_uuid

N/A

System UUID to which this component belongs to.

PowerSystemBus.nominal_voltage

cim:BaseVoltage.nominalVoltage

Note nominal voltage is unit aware but BaseVoltage is not.

Location.x

cim:PositionPoint.xPosition

x coordinate of the component.

Location.y

cim:PositionPoint.yPosition

y coordinate of the component

Location.crs

N/A

Coordinate reference system for geo coordinates.

DistributionBus.voltage_type

N/A

Differentiates from line to line voltage to line to ground voltage

DistributionComponent.feeder

Name of the feeder to which this component belong to

DistributionComponent.substation

Name of the substation to which this component belongs to.

DistributionBus.phases

cim:Terminal.phases

List of phases.

VoltageLimitSet.type

Limit type min or max

VoltageLimitSet.value

Value for limit.

Connectivity Node

Here is an UML diagram of DistributionBus from Grid data models.

            classDiagram

      class ComponentWithQuantities
      ComponentWithQuantities: +name str 
      ComponentWithQuantities: +uuid UUID
      ComponentWithQuantities: +system_uuid UUID | None

      class PowerSystemBus
      PowerSystemBus: +nominal_voltage PositiveVoltage
      PowerSystemBus: +coordinate Location | None

      class Location
      Location: +x float
      Location: +y float 
      Location: +crs str | None

      class DistributionBus
      DistributionBus: +voltage_type VoltageTypes
      DistributionBus: +belongs_to DistributionComponent | None 
      DistributionBus: +phases list[Phase]
      DistributionBus: +voltagelimits list[VoltageLimitSet]

      class VoltageTypes{
        <<enumeration>>
        LINE_TO_LINE
        LINE_TO_GROUND
      }

      class DistributionComponent
      DistributionComponent: +feeder str
      DistributionComponent: +substation str

      class Phase{
        <<enumeration>>
        A
        B
        C
        N
        s1
        s2
      }

      class VoltageLimitSet
      VoltageLimitSet: +limit_type LimitType
      VoltageLimitSet: +value PositiveVoltage

      class LimitType{
        <<enumerations>>
        MIN
        MAX
      }

      PowerSystemBus --|> ComponentWithQuantities
      Location --* PowerSystemBus
      DistributionBus --|> PowerSystemBus
      DistributionComponent <-- DistributionBus
      VoltageLimitSet "0..*" --> "1" DistributionBus

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