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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
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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-
...