GE 850 - Page 466

7–46 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
RTD TEMPERATURE CHAPTER 7: MONITORING
An alphanumeric name is assigned to each channel; this name is included in the channel
actual values. It is also used to reference the channel as the input parameter to features
designed to measure this type of parameter. Selecting the type of RTD connected to the
channel configures the channel. The conversion chart is shown in the RTD Temperature vs.
Resistance table.
Table 7-2: RTD Temperature vs. Resistance
NOTE
NOTE:
RTD type copper (Cu) is only available when order code option ‘S’ is chosen for Slot B or C.
RTD Protection
The 850 relay can monitor up to 13 RTDs and 12 RRTDs, each of which can be configured
to have a trip temperature and an alarm temperature. The RTD Temperature protection
menu will be seen on the relay upon availability of RTD input/inputs. The RRTD
Temperature protection setpoints can be seen only if the 850
has the RMIO module
installed and validated. The minimum RTD Temperature requirement is to set the setpoint
“Type”. The default value for “Type”, for each RTD is “100 Ω Platinum”. The protection RTD
Trip, and RTD Alarm from the menu are optional. They respond to directly measured RTD
TEMPERATURE RESISTANCE (IN OHMS)
°C °F 100 Ω PT
(IEC 60751)
120 Ω NI 100 Ω NI 10 Ω CU
–40 –40 84.27 92.76 77.30 7.49
–30 –22 88.22 99.41 82.84 7.88
–20 –4 92.16 106.15 88.45 8.26
–10 14 96.09 113.00 94.17 8.65
0 32 100.00 120.00 100.00 9.04
10 50 103.90 127.17 105.97 9.42
20 68 107.79 134.52 112.10 9.81
30 86 111.67 142.06 118.38 10.19
40 104 115.54 149.79 124.82 10.58
50 122 119.40 157.74 131.45 10.97
60 140 123.24 165.90 138.25 11.35
70 158 127.08 174.25 145.20 11.74
80 176 130.90 182.84 152.37 12.12
90 194 134.71 191.64 159.70 12.51
100 212 138.51 200.64 167.20 12.90
110 230 142.29 209.85 174.87 13.28
120 248 146.07 219.29 182.75 13.67
130 266 149.83 228.96 190.80 14.06
140 284 153.58 238.85 199.04 14.44
150 302 157.33 248.95 207.45 14.83
160 320 161.05 259.30 216.08 15.22
170 338 164.77 269.91 224.92 15.61
180 356 168.48 280.77 233.97 16.00
190 374 172.17 291.96 243.30 16.39
200 392 175.86 303.46 252.88 16.78
210 410 179.53 315.31 262.76 17.17
220 428 183.19 327.54 272.94 17.56
230 446 186.84 340.14 283.45 17.95
240 464 190.47 353.14 294.28 18.34
250 482 194.10 366.53 305.44 18.73