1. Overview
1.1 Scope
1.2 Purpose
2. Normative references
3. Definitions
4. Buses in various station arrangements
4.1 Single bus
4.2 Main and transfer bus
4.3 Double-bus double-breaker
4.4 Double-bus single-breaker
4.5 Breaker-and-a-half
4.6 Ring bus
4.7 Other bus arrangements
5. Introduction to bus protection
5.1 Zones of bus protection
5.2 Types of bus protection
5.3 Considerations for bus scheme selection
6. Relay input sources
6.1 Current transformers
6.2 Position of disconnect switches and breakers
6.3 Voltage transformers
7. Bus protection methods
7.1 Differential methods
7.2 Zone-interlocked schemes
7.3 Fault bus schemes
8. Application of bus protection schemes
8.1 Partial differential protection
8.2 Combined bus and transformer protection
8.3 Protection of buses with directly connected grounding
transformers
8.4 Application of auxiliary current transformers
8.5 Applications with paralleled current transformers
8.6 Application of auxiliary tripping relays
8.7 Automatic reclosing after bus faults
8.8 Dynamic bus replica
8.9 Voltage trip supervision
8.10 Check zone
8.11 Application of current transformer trouble detection
8.12 Reliable, selective tripping at the differential zone
boundary
8.13 CT column ground fault protection
8.14 In-service transfer of network elements and breaker
substitution
8.15 In-zone grounds
8.16 Stub bus considerations
8.17 Breaker failure considerations
8.18 Backup protection
Annex A (informative) - High-impedance bus differential
application example
Annex B (informative) - Double-bus single-breaker application
example
Annex C (informative) - Setting example for differentially
connected overcurrent bus protection
Annex D (informative) - Bibliography