IEC TR 61850-90-12:2020

Communication networks and systems for power utility automation - Part 90-12: Wide area network engineering guidelines

IEC TR 61850-90-12:2020, which is a Technical Report, is intended for an audience familiar with electrical power automation based on IEC 61850 and related power system management, and particularly for data network engineers and system integrators. It is intended to help them to understand the technologies, configure a wide area network, define requirements, write specifications, select components, and conduct tests.
This document provides definitions, guidelines, and recommendations for the engineering of WANs, in particular for protection, control and monitoring based on IEC 61850 and related standards.
This document addresses substation-to-substation communication, substation-to-control centre, and control centre-to-control centre communication. In particular, this document addresses the most critical aspects of IEC 61850 such as protection related data transmission via GOOSE and SMVs, and the multicast transfer of large volumes of synchrophasor data.
The document addresses issues such as topology, redundancy, traffic latency and quality of service, traffic management, clock synchronization, security, and maintenance of the network.
This document contains use cases that show how utilities tackle their WAN engineering. This second edition cancels and replaces the first edition published in 2015. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) extension of use case with respect to distribution and customer-side applications;
b) extensions of wireless access technologies as well as power line communication ones applicable to the above-mentioned use case;
c) revisions regarding radio communication technology performance;
d) extension of network migration with respect to packet switched network;
e) a new mapping of multiprotocol label switching technology to teleprotection.

General Information

• Status: Published
• Publication Date: 27-Jul-2020
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 33.200 - Telecontrol. Telemetering
• Technical Committee: TC 57 - Power systems management and associated information exchange
• Drafting Committee: WG 10 - TC 57/WG 10
• Current Stage: PPUB - Publication issued
• Start Date: 18-Aug-2020
• Completion Date: 28-Jul-2020

Relations

• Revises: IEC TR 61850-90-12:2015 - Communication networks and systems for power utility automation - Part 90-12: Wide area network engineering guidelines
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC TR 61850-90-12 ®
Edition 2.0 2020-07
TECHNICAL
REPORT
colour
inside
Communication networks and systems for power utility automation –
Part 90-12: Wide area network engineering guidelines
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IEC TR 61850-90-12 ®
Edition 2.0 2020-07
TECHNICAL
REPORT
colour
inside
Communication networks and systems for power utility automation –

Part 90-12: Wide area network engineering guidelines

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.200 ISBN 978-2-8322-8657-9

– 2 – IEC TR 61850-90-12:2020 © IEC 2020
CONTENTS
FOREWORD . 12
INTRODUCTION . 14
1 Scope . 16
2 Normative references . 16
3 Terms, definitions, abbreviated terms, acronyms, and symbols . 21
3.1 Terms and definitions . 21
3.2 Abbreviated terms and acronyms . 25
3.3 Network diagram symbols . 34
4 Wide area communication in electrical utilities . 36
4.1 Executive summary . 36
4.2 Network and application example: ENDESA, Andalusia (Spain) . 38
4.3 Typical interface between a substation and the WAN . 40
4.4 WAN characteristics and actors . 41
4.5 Smart Grid Architecture Model (SGAM) Mapping . 42
4.6 Network elements and voltage level . 44
4.7 WAN interfaces in substation automation (IEC 61850-5) . 45
4.8 Logical interfaces and protocols in the architecture in IEC TR 62357-200 . 46
4.9 Network traffic and ownership . 47
5 WAN metrics . 48
5.1 Traffic types . 48
5.2 Quality of Service (QoS) of TDM and PSN . 48
5.3 Latency calculation . 48
5.3.1 Latency components . 48
5.3.2 Propagation delay . 49
5.3.3 Residence delay . 49
5.3.4 Latency accumulation . 49
5.3.5 Example: latency of a microwave system . 49
5.3.6 Latency and determinism . 50
5.3.7 Latency classes in IEC 61850-5 . 50
5.4 Jitter . 52
5.4.1 Jitter definition . 52
5.4.2 Jitter classes in IEC 61850 . 53
5.5 Latency symmetry and path congruency . 53
5.6 Medium asymmetry . 53
5.7 Communication speed symmetry . 54
5.8 Recovery delay . 54
5.9 Time accuracy . 54
5.9.1 Time accuracy definition . 54
5.9.2 Time accuracy classes. 55
5.10 Tolerance against failures . 56
5.10.1 Failure . 56
5.10.2 Reliability. 57
5.10.3 Redundancy principles. 57
5.10.4 Redundancy and reliability . 58
5.10.5 Redundancy checking . 59
5.10.6 Redundant layout: single point of failure . 59

5.10.7 Redundant layout: cross-redundancy . 60
5.10.8 Maintainability . 61
5.10.9 Availability . 61
5.10.10 Integrity . 63
5.10.11 Dependability . 64
5.10.12 Example: Dependability of GOOSE transmission . 64
6 Use cases and WAN communication requirements . 65
6.1 List of generic use cases . 65
6.2 Teleprotection (IF2 & IF11) . 66
6.2.1 Teleprotection schemes . 66
6.2.2 Teleprotection data kinds . 66
6.2.3 Current differential teleprotection for multi-terminal transmission line . 66
6.2.4 Teleprotection communication requirements . 67
6.3 Wide area monitoring system (IF13) . 69
6.3.1 WAMS overview . 69
6.3.2 WAMS topology . 70
6.3.3 WAMS communication requirements . 72
6.4 Wide area monitoring, protection, and control (WAMPAC) IF13 . 74
6.4.1 Functional description . 74
6.4.2 WAMPAC communication requirements . 76
6.5 Fault Location . 76
6.5.1 Functional description . 76
6.5.2 Fault location communication requirements . 78
6.6 Distribution Automation . 78
6.6.1 Functional description . 78
6.6.2 Distribution automation communication requirements . 79
6.7 Condition monitoring and diagnostics (CMD) and asset management (IF7) . 80
6.7.1 Functional description . 80
6.7.2 CMD communication requirements . 80
6.8 Telecontrol (SCADA) . 81
6.8.1 Functional description . 81
6.8.2 Telecontrol communication requirements . 81
6.9 Control centre to control centre (IF12) . 82
6.9.1 Functional description . 82
6.9.2 Inter control centre communication requirements . 83
6.10 Smart metering / advanced metering infrastructure . 84
6.10.1 Functional description . 84
6.10.2 Smart metering communication requirements . 84
6.11 WAN communication requirements summary . 85
7 Wide-area and real-time network technologies. 86
7.1 General . 86
7.2 Topology . 86
7.3 Overview. 87
7.4 Layer 1 (physical) transmission media . 89
7.4.1 Summary . 89
7.4.2 Installation guidelines . 89
7.4.3 Metallic lines . 89
7.4.4 Power line carrier (PLC) . 91
7.4.5 Radio transmission . 101

– 4 – IEC TR 61850-90-12:2020 © IEC 2020
7.4.6 Fibre optics. 112
7.4.7 Layer 1 redundancy . 118
7.4.8 Application example: diverse redundancy against extreme
contingencies (Hydro-
...