CIM Issues #6808

Determine if we can have BusbarSection and Junction on a single ConnectivityNode

Added by Todd Viegut about 1 month ago. Updated about 1 month ago.

Author/Contact Info:
Todd Viegut
Base Release:
Solution to be Applied To:
Solution Version:
Solution Applied By:
Completion Date:
CIM Keywords:
Breaking Change:
Breaking Change Description:
CIM Impacted Groups:

IEC 61970-301

Originally Closed in Version:
Origination Date:
Origination ID:
Originally Assigned To:


Section in the 301 jCleanCim template has, for CIM18, a new paragraph on BusbarSection and Junction classes. We've had a request to evaluate the following and update this section accordingly:

1. Can we have 2 BusbarSections on 1 ConnectivityNode?
2. Can we have BusbarSection & Junction on 1 ConnectivityNode.

We need to discuss if this is a UML restriction or should if it should be applied at the Profile level.

Proposed Solution

We recommend that the existing description in the BusbarSection class be changed to read:

"A conductor, or group of conductors, with negligible impedance, that serve to connect other conducting equipment within a single substation. The BusbarSection class is intended to represent physical parts of bus bars no matter how that bus bar is constructed.

Voltage measurements are typically obtained from voltage transformers that are connected to busbar sections. A bus bar section may have many physical terminals but for analysis is modelled with exactly one logical terminal."

For the Junction class update the description to:

"A point where one or more conducting equipments are connected with zero resistance.

The Junction class is intended to provide a place to associate additional information to a connectivity node which connects two or more equipment terminals. Examples include a tee-point or the connection point between two switches.

The Junction class is intended to provide a method to associate additional information, for instance Location, to a ConnectivityNode. Examples include a T-point or the connection point between two switches. Typically, BusbarSection objects and Junction objects are represented by different symbols on diagrams."


This was reviewed on 11-Jun-2024 at the Joint Hybrid Meeting in Tokyo and the proposed changes approved. This should be applied to CIM18v12


Updated by Todd Viegut about 1 month ago

  • Proposed Solution updated (diff)

Updated by Todd Viegut about 1 month ago

  • Standard(s) changed from IEC 61970-310 to IEC 61970-301
  • Decision updated (diff)

Also available in: Atom PDF