Does IEEE C50.13 provide universal bearing alarm and trip temperatures for every generator?

No such universal applicability is established here. IEEE C50.13-2014 is an Inactive-Reserved standard for specified 10 MVA and larger cylindrical-rotor synchronous generators; exact clauses require licensed access and the correct machine and measurement definition.

Why must the sensor location be recorded?

Embedded bearing-metal, housing-surface and oil temperatures are different measurands. A threshold is meaningful only for the measurement definition for which it was approved.

Does reaching the trip setpoint mean this webpage orders a shutdown?

No. The page reports the numerical setpoint state. The approved protection logic, delays, voting, interlocks and operating procedure determine the action.

Is temperature rise automatically a severity limit?

No. Optional delta T is only the arithmetic difference between the entered measurement and an explicitly documented reference temperature; this page does not classify it.

Document-controlled protection setpoints

Documented Bearing-Temperature Setpoint Comparator

Compare a defined bearing-temperature measurement with alarm and trip setpoints copied from the governing OEM or protection record. This page supplies no universal generator-bearing limit.

T versus entered setpoints°C / °F exact conversionNo automatic shutdown command

Documented setpoint comparison

Setpoint state

Current T

Documented A / P

Margin A−T

Margin P−T

Optional ΔT=T−R

Implemented comparison—not a universal limit table

T_°C=(T_°F−32)×5/9 | T_°F=T_°C×9/5+32
A−T = alarm margin | P−T = trip margin
T<A → below entered alarm | A≤T<P → at/above entered alarm | T≥P → at/above entered trip
optional ΔT=T−R

The conversions and differences are general arithmetic, not an IEEE or ISO formula. Equality is included at each entered setpoint. A negative margin means the measurement is above that entered setpoint. Optional ΔT is not assigned a universal severity.

NEEDS_LICENSED_SOURCE: the former 70–105°C table was attributed to IEEE C50.13 and “common manufacturer practices”, but no accessible normative clause or product-specific record supported those four universal rows, lubricant offsets or ΔT limits. The values were removed rather than guessed.

IEEE C50.13 lifecycle and scope

IEEE C50.13-2014The official IEEE record identifies the standard for 50/60Hz cylindrical-rotor synchronous generators rated 10MVA and above, driven by steam or gas turbines.

StavIEEE marks the 2014 document Inactive-Reserved, with inactivation dated 27March2025. Purchase or subscription access is required for the full text.

Official record: IEEE C50.13-2014. That scope does not justify selecting a bearing setpoint from bearing type and lubricant alone, nor applying one table to every generator.

Product and application dependence

Na stránkách SKF Bearing Maintenance Handbook describes lubricant temperature limits as product-dependent and notes that the high-temperature performance limit is not internationally standardized. SKF grease selection guidance also ties range to base oil, thickener, additives and bearing type.

Schaeffler rolling-bearing lubrication guidance explains that operating temperature follows heat generation and dissipation through the bearing, adjacent parts and environment; operating tests may be needed. Therefore generic lubricant temperature offsets and universal temperature-rate rules were removed.

ISO vibration standards are not temperature-setpoint sources

ISO10816-1:1995 is withdrawn, and ISO20816-1:2016 concerns vibration measurement and evaluation. Neither official scope supplies a generator-bearing temperature alarm or trip value.

Interpretation boundary

Embedded bearing-metal temperature, housing temperature and lubricant temperature are different measurands. Verify sensor calibration, installation, signal scaling, filtering, alarm delay, voting/interlocks, operating state and the exact approved response procedure. A webpage comparison cannot certify safe operation or command a shutdown.