generator

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The generator is a wind turbine component used with a 690 V double-fed asynchronous generator system.¹²³ It is driven at 1,500 rpm from the gearbox output shaft, with an overall gearbox ratio of 1:118.4 from a rotor speed of 12.7 rpm.⁴⁵⁶⁷ Current records include generator brush inspections and replacements, generator-side HSS bearing maintenance, and generator winding temperature alarms.^{89101112131415161718192021}

Facts

• The gearbox overall ratio is 1:118.4; at a rated rotor speed of 12.7 rpm, the output pinion shaft drives the generator at 1,500 rpm.⁴
• For LT-32 electrical 690 V energy from the generator, converter, and auxiliaries is isolated at the main circuit breaker in the tower base.³
• WI-GEN-014 is a Revision A work instruction applicable from 2025-09-15 to WTG-01 through WTG-12 with a 690 V double-fed asynchronous generator.¹²
• The instruction describes checking and replacing the generator brushes of Litware LT-32 wind turbines at the Quellmoor Ridge wind farm.⁸
• The generator, including stator and rotor, must be locked out according to SOP-LOTO-001.²²
• Alarm A3210, Generator brush wear limit reached, appears when the remaining brush length reaches approximately 20 mm.²³
• The operating procedure begins by obtaining the PTW, stopping the turbine, and locking out the generator.²⁴
• The HSS bearing vibration on the generator side rose from 2.1 mm/s RMS to 5.2 mm/s RMS and exceeded the 4.5 mm/s alarm level.²⁵
• A contributing factor was generator-side HSS bearing wear, supported by oil analysis TR-OA-2026-0614 with iron at 64 ppm, PQ index 112, and the vibration trend.²⁶
• Replacing the generator-side HSS bearing FGT-P-22328 under WO-26-0412 is waiting for parts and is planned on delivery of the bearing.²⁷
• Generator brush inspection task MP-GEN-01 is scheduled every 6 months and references WI-GEN-014.⁹
• Read the sight glass on the generator side of the gearbox.²⁸
• WTG-09 had A3210 Generator brush wear limit reached raised on 2026-07-16 and cleared on 2026-07-18; WTG-09 was also in S310 Maintenance mode on 2026-07-18 from 07:58:12 to 11:52:40.^10111213
• WTG-12 had A3201 Generator winding temperature high raised at 147.3 °C and cleared at 139.5 °C on 2026-08-26.¹⁴¹⁵
• FGT-P-22328, the HSS bearing on the generator side for FGT-3200, is a critical item below minimum stock: 0 pc on hand, minimum 1 pc, reorder quantity 2 pc, and 2 pc on order under PO-76994 for expected delivery on 2026-09-25.²⁹³⁰
• WO-26-0187 for WTG-10 replaced the generator-side HSS bearing, was completed as high-priority corrective maintenance, used part FGT-P-22328 quantity 1, and notes that the last spare bearing was used.¹⁶
• WO-26-0412 for WTG-07 is a high-priority corrective-maintenance work order to replace the generator-side HSS bearing, is waiting for parts, lists part FGT-P-22328 quantity 1, and remarks that vibration is above the alarm level of 4.5 mm/s.¹⁷
• WO-26-0436 for WTG-09 replaced generator brushes for A3210, was completed under WI-GEN-014, used part LWS-P-51207 quantity 1, and notes the shortest brush was 16 mm.¹⁸
• WO-26-0439 for WTG-02 is waiting for parts for a generator-side HSS bearing replacement after spalling was found at endoscopy on 2026-07-23, and it lists part FGT-P-22328 quantity 1.¹⁹
• The gearbox raises rotor speed from 12.7 rpm to 1,500 rpm at the generator.⁵
• The overall gearbox ratio is 1:118.4, with rotor speed 12.7 rpm and generator speed 1,500 rpm.⁶
• HSS means high-speed shaft, the output shaft to the generator coupling.⁷
• The quiz answers state that the HSS drives the generator, A2102 trips at 82 °C, the oil used is Proseware PWG 220, and a rising PQ index means more ferrous wear debris, often from a bearing.³¹
• A stock snapshot dated 21 July showed that HSS bearing FGT-P-22328 on the generator side was below its minimum level.³²
• WTG-09 had its generator brushes replaced under work order WO-26-0436 following alarm A3210 from 16/07.²⁰
• WTG-02 had an endoscope inspection on 23/07 that found spalling on the HSS bearing on the generator side.²¹

Timeline

• 2025-09-15: WI-GEN-014 is a Revision A work instruction applicable from 2025-09-15 to WTG-01 through WTG-12 with a 690 V double-fed asynchronous generator.¹²
• 2026-07-16: WTG-09 had A3210 Generator brush wear limit reached raised on 2026-07-16 and cleared on 2026-07-18; WTG-09 was also in S310 Maintenance mode on 2026-07-18 from 07:58:12 to 11:52:40.^10111213
• 2026-07-23: WO-26-0439 for WTG-02 is waiting for parts for a generator-side HSS bearing replacement after spalling was found at endoscopy on 2026-07-23, and it lists part FGT-P-22328 quantity 1.¹⁹
• 2026-08-26: WTG-12 had A3201 Generator winding temperature high raised at 147.3 °C and cleared at 139.5 °C on 2026-08-26.¹⁴¹⁵
• 2026-09-25: FGT-P-22328, the HSS bearing on the generator side for FGT-3200, is a critical item below minimum stock: 0 pc on hand, minimum 1 pc, reorder quantity 2 pc, and 2 pc on order under PO-76994 for expected delivery on 2026-09-25.²⁹³⁰

Documents

• LWS-MM-GBX-32 Rev. D — LT-32 Maintenance Manual Chapter 4 Gearbox Excerpt
• SOP-LOTO-001 Rev. C - Lockout/tagout of wind turbines
• WI-GEN-014 Rev. A - Generator Brush Replacement
• 8D report INC-2026-006 - Repeated gearbox oil over-temperature on WTG-07 (revision 2026-07-10)
• Maintenance Plan 2026, Issue 2 — Quellmoor Ridge Wind Farm
• SPL-012 Gearbox Oil Level Check
• SCADA alarm and status log, 2026-04-01 to 2026-08-31
• Spare Parts Stock Snapshot 2026-07-21 for Quellmoor Ridge O&M Building
• Work Orders Export through 2026-08-31
• Gearbox Fundamentals for Wind Technicians
• Quellmoor Ridge Wind Farm Onboarding and Site Rules (February 2025)
• Parts shortage - HSS bearing FGT-P-22328 below minimum stock
• Shift Handover Note - Day Shift - 18/07/2026
• Shift Handover for 2026-07-29 Day Shift

Related

• Topics: Blades, pitch bearings and main-component lifts, Cold-climate operation and icing, Environmental permit and night curtailment, Gearbox lubrication and oil changes, Gearbox temperature, vibration and oil analysis, Generator brushes and electrical systems, Grid connection and grid operator instructions, Safety, isolation and work at height, Spare parts, stock levels and supply, Training, site rules and acronyms

Sources

Footnotes

1. WI-GEN-014 Rev. A - Generator Brush Replacement — ¶ 2 · ✓ quote verified ↩ ↩² ↩³

2. WI-GEN-014 Rev. A - Generator Brush Replacement — table 1, row 7 · table ↩ ↩² ↩³

3. SOP-LOTO-001 Rev. C - Lockout/tagout of wind turbines — table 2, row 2 · table ↩ ↩²

4. LWS-MM-GBX-32 Rev. D — LT-32 Maintenance Manual Chapter 4 Gearbox Excerpt — p. 2 · ✓ quote verified ↩ ↩²

5. Gearbox Fundamentals for Wind Technicians — slide 2 · ✓ quote verified ↩ ↩²

6. Gearbox Fundamentals for Wind Technicians — slide 3 · ✓ quote verified ↩ ↩²

7. Gearbox Fundamentals for Wind Technicians — slide 4 · ✓ quote verified ↩ ↩²

8. WI-GEN-014 Rev. A - Generator Brush Replacement — ¶ 4 · ✓ quote verified ↩ ↩²

9. Maintenance Plan 2026, Issue 2 — Quellmoor Ridge Wind Farm — sheet "Tasks", row 9 · table ↩ ↩²

10. SCADA alarm and status log, 2026-04-01 to 2026-08-31 — row 1281 · table ↩ ↩² ↩³

11. SCADA alarm and status log, 2026-04-01 to 2026-08-31 — row 1317 · table ↩ ↩² ↩³

12. SCADA alarm and status log, 2026-04-01 to 2026-08-31 — row 1313 · table ↩ ↩² ↩³

13. SCADA alarm and status log, 2026-04-01 to 2026-08-31 — row 1318 · table ↩ ↩² ↩³

14. SCADA alarm and status log, 2026-04-01 to 2026-08-31 — row 1878 · table ↩ ↩² ↩³

15. SCADA alarm and status log, 2026-04-01 to 2026-08-31 — row 1879 · table ↩ ↩² ↩³

16. Work Orders Export through 2026-08-31 — row 38 · table ↩ ↩²

17. Work Orders Export through 2026-08-31 — row 73 · table ↩ ↩²

18. Work Orders Export through 2026-08-31 — row 78 · table ↩ ↩²

19. Work Orders Export through 2026-08-31 — row 80 · table ↩ ↩² ↩³

20. Shift Handover Note - Day Shift - 18/07/2026 — lines 6–12 · ✓ quote verified ↩ ↩²

21. Shift Handover for 2026-07-29 Day Shift — lines 5–14 · ✓ quote verified ↩ ↩²

22. WI-GEN-014 Rev. A - Generator Brush Replacement — ¶ 7 · ✓ quote verified ↩

23. WI-GEN-014 Rev. A - Generator Brush Replacement — ¶ 15 · ✓ quote verified ↩

24. WI-GEN-014 Rev. A - Generator Brush Replacement — ¶ 17 · ✓ quote verified ↩

25. 8D report INC-2026-006 - Repeated gearbox oil over-temperature on WTG-07 (revision 2026-07-10) — ¶ 7 · ✓ quote verified ↩

26. 8D report INC-2026-006 - Repeated gearbox oil over-temperature on WTG-07 (revision 2026-07-10) — ¶ 18 · ✓ quote verified ↩

27. 8D report INC-2026-006 - Repeated gearbox oil over-temperature on WTG-07 (revision 2026-07-10) — table 2, row 5 · table ↩

28. SPL-012 Gearbox Oil Level Check — slide 2 · ✓ quote verified ↩

29. Spare Parts Stock Snapshot 2026-07-21 for Quellmoor Ridge O&M Building — sheet "About", row 3 · table ↩ ↩²

30. Spare Parts Stock Snapshot 2026-07-21 for Quellmoor Ridge O&M Building — sheet "Stock", row 2 · table ↩ ↩²

31. Gearbox Fundamentals for Wind Technicians — slide 10 · ✓ quote verified ↩

32. Parts shortage - HSS bearing FGT-P-22328 below minimum stock — message body, lines 5–6 · ✓ quote verified ↩

Provenance badges✓ quote verified the quoted words were found verbatim in the source texttable values parsed deterministically from the cited table rows