Author(s): IEEE
Series: Ieee Guide For Generator Ground Protection
Publisher: Institute of Electrical & Electronics Enginee
Language: English
Pages: 59
Title Page......Page 1
Introduction......Page 3
Participants......Page 4
CONTENTS......Page 6
1.2 Description of the guide......Page 8
3. Summary of protection schemes......Page 9
4. Generator connections......Page 11
5.1 Method I: High-resistance grounded (distribution-transformer grounded)......Page 13
5.5 Method V: Resonant grounded (ground-fault neutralizer grounded {GFN])......Page 14
6. Protective schemes......Page 15
6.1 Scheme 1: Ground overvoltage—Complete shutdown......Page 16
6.2 Scheme 2: Ground overvoltage—Permissive shutdown......Page 18
6.4 Scheme 4: Ground overvoltage—Alarm......Page 19
6.5 Scheme 5: Start-up ground overvoltage—Complete shutdown......Page 20
6.6 Scheme 6: Ground-fault neutralizer overvoltage—Alarm and time-delay orderly shutdown......Page 21
6.7 Scheme 7: Wye-broken-delta voltage transformer (vt) ground overvoltage—Complete shutdown......Page 23
6.9 Scheme 9: Secondary-connected current transformer (ct), time-delay ground overcurrent—Complete shutdown......Page 24
6.10 Scheme 10: Primary connected ct, time-delay ground overcurrent—Complete shutdown......Page 25
6.11 Scheme 11: Instantaneous ground overcurrent—Alarm and/or complete shutdown......Page 26
6.12 Scheme 12: Generator leads ground overcurrent—Complete shutdown......Page 27
6.13 Scheme 13: Three-wire generator leads window ct instantaneous ground overcurrent—Complete shutdown......Page 28
6.15 Scheme 15: Generator percentage differential—Complete shutdown......Page 29
6.16 Scheme 16: Generator ground differential using product type relay......Page 30
6.18 Scheme 18: Ground-fault relays for the complete protection of the generator stator winding......Page 31
6.19 Scheme 19: Alternate stator winding protection using high-impedance differential relays......Page 36
6.20 Scheme 20: Generator neutral overcurrent protection for the case of accidental solid neutral grounding......Page 37
7. Protective device function numbers......Page 40
Annex A—Ground protection example for a high-resistance grounded generator......Page 42
Annex B—Ground protection example to determine the percent coverage of a high-impedance differential relay......Page 54
Annex C—Bibliography......Page 57
