Checking The Temperature Measurement Via Rtd-Box - Siemens siprotec SJ62 User Manual

3.3.13 Checking the Temperature Measurement via RTD-Box

SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
Figure 3-39 Polarity testing for I
Holmgreen-connection (VTs Wye-connected)
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 re-
placed by adjustable resistors (e.g. precision resistance decade) and the correct as-
signment of the resistance value and the displayed temperature for 2 or 3 temperature
values from the following table are verified.
Table 3-37 Assignment of the resistance value and the temperature of the sensors
Temperature in Temperature in
°C
–50 –58
–40 –40
–30 –22
–20 –4
–10 14
0 32
10 50
20 68
, example with current transformers configured in a
N
Ni 100 DIN 43760 Ni 120 DIN 34760 Pt 100 IEC 60751
°F
74.255
79.1311726
84.1457706
89.2964487
94.581528
100
105.551528
111.236449
3.3 Commissioning
89.106 80.3062819
94.9574071 84.270652
100.974925 88.2216568
107.155738 92.1598984
113.497834 96.085879
120 100
126.661834 103.902525
133.483738 107.7935
436