IEEE C37.101-2006 REDLINE

1 Overview
  1.1 Scope
  1.2 Purpose
  1.3 Description of the guide
2 Normative references
3 Definitions, acronyms, and abbreviations
  3.1 Definitions
  3.2 Acronyms and abbreviations
4 Summary of protection schemes
5 Generator connections
  5.1 Example use of Table 1
6 Generator grounding methods
  6.1 Method I - Effective high-resistance ground with a
       distribution transformer
  6.2 Method II - High-resistance ground with a neutral ground
       resistor
  6.3 Method III - Low-resistance ground with a neutral ground
       resistor
  6.4 Method IV - Low-reactance ground with a neutral ground
       reactor
  6.5 Method V - Resonant ground with a ground fault neutralizer
  6.6 Method VI - High-resistance ground with a delta-grounded-wye
       transformer
  6.7 Method VII - Medium-resistance ground with a
       delta-grounded-wye transformer
  6.8 Method VIII - Ungrounded
  6.9 Method IX - Hybrid ground (switching low resistance to
       high resistance)
7 Protective schemes
  7.1 Scheme 1 - Ground overvoltage (complete shutdown)
  7.2 Scheme 2 - Ground overvoltage (permissive shutdown)
  7.3 Scheme 3 - Ground overvoltage exceed rated relay voltage
       (alarm and time-delay shutdown)
  7.4 Scheme 4 - Ground overvoltage exceed rated relay voltage
       (alarm)
  7.5 Scheme 5S - Start-up ground overvoltage (complete shutdown)
  7.6 Scheme 6 - Ground fault neutralizer (alarm and time-delay
       shutdown)
  7.7 Scheme 7 - Grounded wye-broken-delta VTs with ground
       overvoltage (complete shutdown)
  7.8 Scheme 8S - Start-up grounded wye-broken-delta VTs with
       ground overvoltage (complete shutdown)
  7.9 Scheme 9 - Secondary-connected CT, time-delay ground
       overcurrent (complete shutdown)
  7.10 Scheme 10 - Primary-connected CT, time-delay ground
       overcurrent (complete shutdown)
  7.11 Scheme 11 - Instantaneous ground overcurrent (alarm
       and/or complete shutdown)
  7.12 Scheme 12 - Generator leads ground overcurrent (complete
       shutdown)
  7.13 Scheme 13 - Three-wire generator leads with window CT,
       instantaneous ground overcurrent (complete shutdown)
  7.14 Scheme 14 - Four-wire generator leads with window CT,
       instantaneous ground overcurrent (complete shutdown)
  7.15 Scheme 15 - Generator percentage differential (complete
       shutdown)
  7.16 Scheme 16 - Current-polarized directional overcurrent relay
  7.17 Scheme 17 - Generator percentage differential relay on
       delta-connected generator (complete shutdown)
  7.18 Scheme 18 - 100% stator winding ground protection schemes
  7.19 Scheme 19 - Alternate stator winding protection with
       high-impedance relays
  7.20 Scheme 20 - Generator neutral overcurrent protection for
       an accidental solid ground fault
  7.21 Scheme 21 - Directional ground fault protection for
       high-resistance ground bus connected generators (multi-ground)
  7.22 Scheme 22 - Hybrid ground protection for high-resistance
       grounded bused generator and ungrounded distribution system
8 Miscellaneous considerations
9 Protective device function numbers
Annex A (informative) Stator ground protection for a
        high-resistance grounded generator
Annex B (informative) Ground protection example to determine
        the percent coverage of a high-impedance differential relay
Annex C (informative) Glossary
Annex D (informative) Bibliography