Mounting and Commissioning
3.3 Commissioning
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A4, Release date 08.2010
329
3.3.13 Checking the Temperature Detection
Temperature Measurement using RTD Boxes
When connecting RTD boxes to the RS485 interface, please check the setting of the bus address at the pro-
tection device as described in the section 3.2.
When connecting RTD boxes to the Ethernet port, you have to carry out the preparatory steps for commission-
ing first which are described in the operating manual. Make sure that the IP address at the RTD box corre-
sponds to that at the protection device.
If the settings are correct, you can start checking the measured values and thresholds of the temperature.
If temperature sensors with 2-phase connection are used, you must first determine the line resistance for the
temperature detector being short-circuited. Proceed as described in the operating manual. Enter the resistance
value determined for the corresponding sensor at the RTD box (range: 0 to 50.6 Ω).
When using the preset 3-phase connection for the temperature detectors no further entry must be made.
Checking the Measured Temperature Values
Pt100 temperature sensors are standard for temperature detection via both the RTD boxes and the I/O 2 ex-
tension module. When using Ni100 or Ni120 temperature sensors, the device will convert the temperature dis-
played at the RTD box.
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 3-5 Assignment of the resistance value and the temperature of the sensors
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
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