6–106 345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
S6 MONITORING CHAPTER 6: SETPOINTS
As an option, a CANBUS-based RMIO module can be installed on the 345, which can
monitor up to 12 RTDs. The RTD protection setpoints can be seen only if the 345 has the
RMIO module installed and validated. If, for some reason, communication with the RMIO
module is lost or interrupted, the 345 will issue an RMIO MISMATCH self-test error
indicating the failure. This feature is useful as it ensures that the remote RTDs are being
continuously monitored.
The RTD type supported is 100 Ohm Platinum. Each of these may be configured to have a
trip temperature as well as an alarm temperature. The alarm temperature is normally set
slightly above the normal running 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 will be issued. If the RTD is chosen to vote with itself, the voting
feature is disabled.
Each RTD may also be configured as being of application type Ambient, Top-Oil, Bottom-
Oil, or Other. The table below - RTD Temperature vs Resistance - lists RTD resistance versus
temperature.
PATH:
SETPOINTS > S6 MONITORING > RTD TEMPERATURE > RTD #1(12)
RTD #1 to 12 APPLICATION
Range: None, Top-oil, Bottom-oil, Ambient, Other
Default: None
Sets the application type.
RTD #1 to 12 NAME
Range: 1 to 18 characters
Default: RTD 1(12)
Sets the RTD programmable name.
RTD #1 to 12 ALARM
Range: Disabled, Enabled
Default: Disabled
This setting enables the RTD #1 to 12 Alarm functionality.
RTD #1 to 12 ALARM TEMP
Range: 1
o
C to 250
o
C in steps of 1
o
C
Default: 130
o
C
Sets the Alarm temperature.
RTD #1 to 12 ALARM PKP DELAY
Range: 0.00 to 600.00 s in steps of 0.01 s
Default: 2.00 s
Sets the Alarm pickup delay time.
RTD #1 to 12 ALARM DPO DELAY
Range: 0.00 to 600.00 s in steps of 0.01 s
Default: 2.00 s
Sets the Alarm dropout delay time.
RTD #1 to 12 TRIP
Range: Disabled, Enabled
Default: Disabled
This setting enables the RTD #1 to 12 Trip functionality.
RTD #1 to 12 TRIP TEMP
Range: 1
o
C to 250
o
C in steps of 1
o
C
Default: 155
o
C
Sets the Trip temperature.
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