Functions
2.15 Temperature Detection via RTD Boxes
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A4, Release date 08.2010
227
Processing Temperatures
The evaluation of the temperatures measured via RTD box or the internal measuring function (temperature de-
tection via I/O 2 extension module) is identical.
The temperature raw data are converted into a temperature in degrees Celsius or Fahrenheit. The conversion
depends on the temperature sensor used.
For each temperature detector two threshold decisions can be performed which are available for further pro-
cessing. The user can make the corresponding allocations in the configuration matrix.
Each temperature sensor generates an alarm in the event of a short-circuit or an interruption of the sensor
circuit or if a sensor is configured but not assigned. Additionally, a group indication is formed across all temper-
ature sensors of the RTD boxes, or across all temperature sensors when measuring the temperature via
the I/O 2 extension module (14101 „Fail: RTD“).
An error message is generated when the communication between RTD box and protection device is faulted or
in the event of an internal fault of the internal temperature measurement. The message 264 „Fail: RTD-Box
1“ or 267 „Fail: RTD-Box 2“ for temperature detection via RTD box, message 208 „Fail: RTD int.“
for temperature detection via the I/O 2 extension module.
Figure 2-87 shows the logic diagram of the temperature processing via RTD box. The manual supplied with the
RTD box contains a connection circuit diagram and a dimensioned drawing.
Figure 2-88 shows the logic diagram of the temperature processing via I/O 2 extension module.
Figure 2-87 Logic diagram of temperature processing for thermobox
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