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Generator Bearing Temperature Monitor & Limits
Check bearing temperature against alarm and trip limits per IEEE C50.13 and manufacturer guidelines. Supports journal and rolling element bearings with different lubricant types.
Results
IEEE C50.13 Bearing Temperature Limits
IEEE C50.13 (Cylindrical-Rotor Synchronous Generators) provides guidance on bearing temperature limits for generators. The following are typical limits:
| Bearing Type | Normal (°C) | Alarm (°C) | Trip (°C) | Max ΔT (°C) |
|---|---|---|---|---|
| Journal (sleeve), mineral oil | ≤ 75 | 90 | 100 | 45 |
| Journal (sleeve), synthetic oil | ≤ 80 | 95 | 105 | 50 |
| Rolling element, grease | ≤ 70 | 80 | 95 | 40 |
| Rolling element, oil bath | ≤ 75 | 85 | 100 | 45 |
Temperature Rise (ΔT)
The temperature rise above ambient is a key diagnostic indicator:
- ΔT ≤ 40°C — Normal operation
- ΔT = 40–55°C — Elevated — investigate cause
- ΔT > 55°C — Excessive — immediate action required
Common Causes of High Bearing Temperature
- Insufficient or degraded lubricant
- Misalignment (angular or offset)
- Excessive bearing load or preload
- Inadequate oil flow or cooling
- Bearing damage (spalling, scoring)
- Shaft seal friction
- High ambient temperature
ℹ️ Trend interpretation: A sudden temperature increase of 10°C or more over a short period (hours) indicates a developing problem and warrants immediate investigation, even if the absolute temperature is below alarm level.
⚠️ Note: These are typical industry limits. Always refer to the specific generator manufacturer’s documentation for exact alarm and trip setpoints, as they may differ based on bearing design, size, and operating conditions.
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