IEEE C37.120-2021

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IEEE Guide for Protection System Redundancy for Power System Reliability

Published By	Publication Date	Number of Pages
IEEE	2021	72

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Description

New IEEE Standard – Active. This guide is developed to assist users in selecting the appropriate level of protection system redundancy for power system reliability based on the best industry practices. It defines protection system redundancy and examines the effect of protection system components on redundancy. Different concepts of redundancy as related to physical location, instrument transformer, relay scheme, and communication systems are discussed. Redundancy application considerations for various power system elements are presented.

PDF Catalog

PDF Pages	PDF Title
1	IEEE Std C37.120™-2021 Front cover
2	Title page
4	Important Notices and Disclaimers Concerning IEEE Standards Documents
8	Participants
10	Introduction
11	Contents
12	List of Figures
14	List of Tables
15	1. Overview 1.1 Scope 1.2 Purpose 1.3 Word usage 2. Normative references
16	3. Definitions, acronyms, and abbreviations 3.1 Definitions
17	3.2 Acronyms and abbreviations
18	4. General considerations for redundancy 4.1 Overview 4.2 Redundancy fundamentals
20	4.3 Required degree of protection
21	4.4 Economic considerations 4.5 Impact of redundancy on reliability
24	4.6 Redundancy simplicity considerations
25	4.7 Relay technology effect on redundancy 4.8 Maintenance considerations 5. Component effect on protection system redundancy 5.1 General
26	5.2 Physical redundancy 5.3 Instrument transformer circuit redundancy
29	5.4 Merging units
30	5.5 Battery/dc source circuit redundancy
33	5.6 DC control circuit redundancy 5.7 Breaker trip coil circuit redundancy
34	5.8 Relay system redundancy
38	5.9 Communications channel redundancy
42	5.10 Local area network redundancy
48	5.11 Timing system redundancy
50	6. Redundancy application considerations 6.1 Overview
51	6.2 Generator protection
54	6.3 Bus protection
55	6.4 Transmission line protection
58	6.5 Transformer protection
59	6.6 Shunt reactor protection
61	6.7 Capacitor bank protection
63	6.8 Distribution protection 6.9 Breaker failure protection
65	6.10 Autoreclosing redundancy 6.11 System integrity protection schemes (SIPS)
68	6.12 Refurbishment considerations
70	Annex A (informative) Bibliography
72	Back cover