IEC TR 61850-7-5:2021

Overview

IEC TR 61850-7-5:2021 - "Communication networks and systems for power utility automation - Part 7‑5: IEC 61850 modelling concepts" is an informative Technical Report that establishes cross‑domain modelling concepts to help users apply the data models defined in IEC 61850‑7‑4 and IEC 61850‑7‑3. It provides basic, domain‑independent guidance for modelling application functions in power utility automation (substations, DER, hydro, wind, smart grids, electric mobility, etc.), while domain‑specific extensions are covered in the IEC TR 61850‑7‑5xx family (for example IEC TR 61850‑7‑500 for substation automation).

Key topics and technical guidance

• Modelling foundations: Uses the IEC 61850 class model (IEC 61850‑7‑1) and logical nodes/data names from IEC 61850‑7‑4 and IEC 61850‑7‑3 as modelling building blocks.
• Control concepts: Guidance on control authorization, validating control requests, exclusive control among actors, and varying control permissions within a control hierarchy. Addresses interlocking and synchronism checks related to control commands.
• Quality propagation: Rules for how quality attributes are processed and propagated through models; special cases (e.g., single‑phase XCBR mapped to CSWI) and configurable behaviors (e.g., propagation of source, non‑propagation of detailQual/operatorBlocked) are described.
• Health and diagnostics: Use of health indicators such as LPHD.PhyHealth, LLN0.Health, LN.Health and LN.EEHealth for device and logical node health monitoring, including proxy‑IED and mirrored LN scenarios.
• Special functions: Modelling of scheduling and scheduler functions for cross‑domain services - important for DER coordination and electric vehicle charging orchestration.
• Restart behaviour: Treatment of function and communication restoration after IED restart (power cycle), including stored vs non‑stored data and interoperability implications.
• Interoperability focus: Emphasis on agreed behaviour to avoid multi‑vendor interoperability issues (e.g., restart behaviour, control semantics).

Practical applications and intended users

Who benefits:

• Protection, control and automation engineers designing IEC 61850‑based systems
• System integrators and utilities implementing substation automation, DER integration, and smart grid services
• IED and software vendors developing compliant products and data models
• Test laboratories validating multi‑vendor interoperability and restart/health behaviors

Typical uses:

• Defining logical node instances and relationships for practical applications
• Aligning control, quality and health semantics across domains to improve vendor interoperability
• Implementing schedulers for DER and electric mobility services
• Specifying restart behaviour and persistent data requirements for IEDs

Related standards

• IEC 61850‑7‑1 (class model)
• IEC 61850‑7‑3 and IEC 61850‑7‑4 (logical node and data definitions)
• IEC 61850‑7‑2 (services)
• IEC TR 61850‑7‑500 (substation automation modelling concepts)