GE 845 Instruction Manual page 442

RTD TEMPERATURE
4–338
TEMPERATURE
°C
220
230
240
250
RTD Protection
The RTD protection setpoints can be seen only if one or two RTD modules are installed and
validated. The alarm temperature is normally set slightly above the normal running motor
temperature. The trip temperature is normally set at the insulation rating. Trip Voting has
been added for extra security in the event of RTD malfunction. If enabled, a second RTD
must also exceed the trip temperature of the RTD being checked before a trip is issued. If
the RTD is chosen to vote with itself, the voting feature is disabled. Each RTD can also be
configured to be application type "None", "Stator", "Bearing", "Ambient" or "Other". RTDs
configured as "Stator" type are also used by the thermal model for determining the RTD
Bias.
Path:
Setpoints > RTD Temperature > RTD 1
TRIP FUNCTION
Range: Disabled, Trip, Configurable
Default: Disabled
For Transformer applications, if a trip is not required from the RTD, the user can select
"Configurable". The "Configurable" setting enable the RTD without producing trip.
NAME
Range: Up to 13 alphanumeric characters
Default: RTD 1
TYPE
Range: 100 Ω Platinum
Default: 100 Ω Platinum
Selects the type of the RTD used.
TRIP TEMPERATURE
Range: 1°C to 250°C in steps of 1°C
Default: 155°C
°F
428
446
464
482
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS
RESISTANCE (IN OHMS)
100 Ω PT (IEC 60751)
183.19
186.84
190.47
194.10