5.2 RTD LOGIC
V03203
RTD Alarm Set
&
RTD Open Cct
RTD Short Cct
RTD Data Error
RTD Board Fail
RTD 1 Alarm
RTD Value
&
RTD 1 Alarm
RTD 10 Alarm
Any RTD Alarm
RTD Trip Set
&
RTD Open Cct
RTD Short Cct
RTD Data Error
RTD Board Fail
RTD 1 Trip
RTD Value
&
RTD 1 Trip
RTD 10 Trip
Any RTD Trip
Note: This diagram does not show all stages . Other stages follow similar principles.
Figure 66: RTD logic
5.3 APPLICATION NOTES
5.3.1 SETTING GUIDELINES FOR RTD PROTECTION
The following table shows typical operating temperatures for protected plant. These are for guidance only. You
must obtain the actual figur
es from the equipment manufacturers:
Parameter Typical service temperature Short term overloading at full load
Bearing temperature generators
60° - 80°C, depending on the type of
bearing.
60 - 80°C+
Top oil temperature of
transformer
s
80°C (50 - 60°C above ambient).
A temperature gradient from winding
temperature is usually assumed, so that top oil
RTDs can provide winding protection
Winding hot spot temperature 98°C for normal aging of insulation. 140°C+ during emergencies
Chapter 7 - Transformer Condition Monitoring P64x
158 P64x-TM-EN-1.3
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