Mounting and Commissioning
3.3 Commissioning
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
459
3.3.13 Checking the Temperature Measurement via RTD-Box
After the termination of the RS485 port and the setting of the bus address have been verified according to
Section 3.2, the measured temperature values and thresholds can be checked.
If temperature sensors are used with 2-phase connection you must first determine the line resistance for the
temperature detector being short-circuited. Select mode 6 at the RTD-Box and enter the resistance value you
have determined for the corresponding sensor (range: 0 to 50.6 Ω).
When using the preset 3-phase connection for the temperature detectors no further entry must be made.
For checking the measured temperature values, the temperature detectors are replaced by adjustable resistors
(e.g. precision resistance decade) and the correct assignment of the resistance value and the displayed tem-
perature for 2 or 3 temperature values from the following table are verified.
Table 3-33 Assignment of the resistance value and the temperature of the sensors
Temperature thresholds that are configured in the protection device can be checked by slowly approaching the
resistance value.
Temperature in °C Temperature in °F Ni 100 DIN 43760 Ni 120 DIN 34760 Pt 100 IEC 60751
–50 –58 74.255 89.106 80.3062819
–40 –40 79.1311726 94.9574071 84.270652
–30 –22 84.1457706 100.974925 88.2216568
–20 –4 89.2964487 107.155738 92.1598984
–10 14 94.581528 113.497834 96.085879
0 32 100 120 100
10 50 105.551528 126.661834 103.902525
20 68 111.236449 133.483738 107.7935
30 86 117.055771 140.466925 111.672925
40 104 123.011173 147.613407 115.5408
50 122 129.105 154.926 119.397125
60 140 135.340259 162.408311 123.2419
70 158 141.720613 170.064735 127.075125
80 176 148.250369 177.900442 130.8968
90 194 154.934473 185.921368 134.706925
100 212 161.7785 194.1342 138.5055
110 230 168.788637 202.546364 142.292525
120 248 175.971673 211.166007 146.068
130 266 183.334982 220.001979 149.831925
140 284 190.88651 229.063812 153.5843
150 302 198.63475 238.3617 157.325125
160 320 206.58873 247.906476 161.0544
170 338 214.757989 257.709587 164.772125
180 356 223.152552 267.783063 168.4783
190 374 231.782912 278.139495 172.172925
200 392 240.66 288.792 175.856
210 410 249.79516 299.754192 179.527525
220 428 259.200121 311.040145 183.1875
230 446 268.886968 322.664362 186.835925
240 464 278.868111 334.641733 190.4728
250 482 289.15625 346.9875 194.098125
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