IEEE C37.101 2007

$37.38

IEEE Guide for Generator Ground Protection

Published By	Publication Date	Number of Pages
IEEE	2007	79

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Description

Revision Standard – Active. The guide is intended to assist protection engineers in applying relays and relaying schemes for protection against stator ground faults on various generator grounding schemes. The existing guide is outdated due to rapid technology development. Hence, the revised guide includes new stator ground protection principles that have evolved with the use of new technologies in relay designs. Additional application examples are included, and other issues raised by the users are also addressed. The guide is not intended for the selection of generator or ground connection schemes. IEEE Std C37.101-1993/Incorporates IEEE Std C37.101-2006/Cor1:2007.

PDF Catalog

PDF Pages	PDF Title
3	IEEE Std C37.101-2006
4	Abstact/Keywords
6	Introduction Notice to users
7	Participants
8	IEEE Std C37.101-2006/Cor1:2007
13	1. Overview 1.1 Scope 1.2 Purpose
14	1.3 Description of the guide 2. Normative references 3. Definitions, acronyms, and abbreviations 3.1 Definitions
15	3.2 Acronyms and abbreviations 4. Summary of protection schemes
19	5. Generator connections
21	5.1 Example use of Table 1 6. Generator grounding methods
22	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
23	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
24	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
25	7.1 Scheme 1—Ground overvoltage (complete shutdown)
27	7.2 Scheme 2—Ground overvoltage (permissive shutdown)
28	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)
29	7.5 Scheme 5S—Start-up ground overvoltage (complete shutdown)
30	7.6 Scheme 6—Ground fault neutralizer (alarm and time-delay shutdown)
32	7.7 Scheme 7—Grounded wye-broken-delta VTs with ground overvoltage (complete shutdown)
33	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)
34	7.10 Scheme 10—Primary-connected CT, time-delay ground overcurrent (complete shutdown)
35	7.11 Scheme 11—Instantaneous ground overcurrent (alarm and/or complete shutdown)
36	7.12 Scheme 12—Generator leads ground overcurrent (complete shutdown)
37	7.13 Scheme 13—Three-wire generator leads with window CT, instantaneous ground overcurrent (compl…
38	7.14 Scheme 14—Four-wire generator leads with window CT, instantaneous ground overcurrent (comple…
39	7.15 Scheme 15—Generator percentage differential (complete shutdown) 7.16 Scheme 16—Current-polarized directional overcurrent relay
40	7.17 Scheme 17—Generator percentage differential relay on delta-connected generator (complete shu…
41	7.18 Scheme 18—100% stator winding ground protection schemes
48	7.19 Scheme 19—Alternate stator winding protection with high-impedance relays
49	7.20 Scheme 20—Generator neutral overcurrent protection for an accidental solid ground fault
50	7.21 Scheme 21—Directional ground fault protection for high-resistance ground bus connected gener…
51	7.22 Scheme 22—Hybrid ground protection for high-resistance grounded bused generator and unground…
52	8. Miscellaneous considerations
54	9. Protective device function numbers
56	Annex A (informative) Stator ground protection for a high-resistance grounded generator
70	Annex B (informative) Ground protection example to determine the percent coverage of a high-impedance differential relay
73	Annex C (informative) Glossary
76	Annex D (informative) Bibliography