Non-Breaker Example from IEC 61970-301 Figure 10 Terminal SS2 400 KV BB1 Volts (KV) CN5 CNx: ConnectivityNode SS1-SS2 TPx: TopologicalNode P1 (MW) DC2 CN4 BR1 SS1 CN3 Cable1 CN2 Cable2 CN1 BRx: Breaker BBx: BusbarSection SSx: Substation xKV: Voltagelevel Tx: PowerTransformer Cable3 BR3 P2 (MW) SSx-SSy: Line Measurement CN6 CN8 T1 Resulting Bus Topological Node x (TPx) in Substation SS2 Volatge Level 400 KV After Removal of Closed Switches BR3, DC2, and BR1 SS4 CN7 110 KV TPx Contains Connectivity Nodes That Have Been Reduced, i.e., CN6, CN5, CN4, CN3 BB1 TPx Cable 1 T1 figure 3. An example computation of a power flow bus. Bus-Branch Profile EnergyConsumer + mRID : String + name : String + p : ActivePower + q : ActivePower ACLineSegment + mRID : String + name : String + length : Length + bch : Susceptance + gch : Conductance + r : Resistance + x : Reactance ConductingEquipment 1 TopologicalNode + mRID : String + name : String TopologicalNode 1 Terminals 1 Terminals 2 ConductingEquipment 1 Terminals 1..* Terminal + mRID : String + name : String + connected : Boolean + sequenceNumber : Integer + phases : PhaseCode figure 4. A subset for a bus-branch profile. from the canonical model class, and all other attributes have been omitted from the profile. The aclinesegment class retains only the basic attributes required for simple power flow with the zero-sequence attributes from the canonical model discarded for this profile. january/february 2016 at the terminal level, we retain the link to Topologicalnode as this is the cIm class for representing a computed bus in a bus-branch representation of a model. The connectivitynode association is not retained as this is used for node-switch models and is not required for our bus-branch ieee power & energy magazine 73