Table of Contents

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

Abstract

Supports utility engineers and industrial and commercial plant engineers in selecting and engineering proper bus protection.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Institute of Electrical & Electronics Engineers
Pages
ISBN