CHAPTER 6: SETPOINTS S6 MONITORING
345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 6–109
THE RTD TROUBLE ALARM
All RTDs that are programmed with either an alarm or a trip are monitored for sensor
failure. When the measured temperature is greater than 250ºC or less than -50ºC, the RTD
is declared failed and a common RTD trouble alarm is issued.
RTD TROUBLE ALARM
Range: Disable, Enable
Default: Disable
This setting enables the RTD Trouble Alarm functionality.
OUTPUT RELAY X
For details see Common setpoints
.
BLOCK 1 to 3
For details see Common setpoints
.
Table 6-11: RTD Temperature vs Resistance
Temperature 100 Ω Pt (DIN 43760)
o
C
o
F
–50 –58 80.31
–40 –40 84.27
–30 –22 88.22
–20 –4 92.16
–10 14 96.09
0 32 100.00
10 50 103.90
20 68 107.79
30 86 111.67
40 104 115.54
50 122 119.39
60 140 123.24
70 158 127.07
80 176 130.89
90 194 134.70
100 212 138.50
110 230 142.29
120 248 146.06
130 266 149.82
140 284 153.58
150 302 157.32
160 320 161.04
170 338 164.76
180 356 168.47
190 374 172.46
200 392 175.84
210 410 179.51
220 428 183.17
230 446 186.82
240 464 190.45
250 482 194.08
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