2 Functions
232
7UT613/63x Manual
C53000-G1176-C160-2
2.10 RTD-Boxes for Overload Detection
For thermal overload protection, taking into consideration the ambient or coolant tem-
perature as well as the overload protection with hot-spot calculation and relative
ageing rate determination, the coolant temperature in the protected object or the tem-
perature of the hottest spot of the winding (e.g. of a transformer) is required. At least
one resistance temperature detector (RTD) must be installed at the hot-spot location
which informs the device about this temperature via an RTD box 7XV5662-xAD. One
RTD box is able to process up to 6 RTDs. One or two RTD boxes 7XV5662-xAD can
be connected to the device.
2.10.1 Function Description
One RTD box 7XV5662-xAD can be used for up to 6 measuring points (RTDs) in the
protected object, e.g. in the transformer tank. The RTD box detects the coolant tem-
perature of each measuring point from the resistance value of the temperature detec-
tors (Pt 100, Ni 100 or Ni 120) connected with a two- or three-wire line and converts it
to a digital value. The digital values are output at the serial interface RS485.
One or two RTD boxes can be connected to the service interface of the 7UT613/63x.
Thus, up to 6 or 12 measuring points (RTDs) can be processed. For each temperature
detector, characteristic data as well as alarm (stage 1) and trip (stage 2) can be set.
The RTD box also acquires thresholds of each single measuring point. The informa-
tion is then passed on via an output relay. For further information, refer to the instruc-
tion manual of the RTD box.
2.10.2 Setting Notes
General Set the type of temperature detector for RTD 1 (temperature sensor for measuring
point 1) at address 9011 RTD 1 TYPE. You can choose between Pt 100 Ω, Ni 120
Ω and Ni 100 Ω. If no temperature detector is available for RTD 1, set RTD 1 TYPE
= Not connected. This parameter can only be set with DIGSI under Additional Set-
tings.
Address 9012 RTD 1 LOCATION informs the device regarding the mounting location
of RTD 1. You can choose between Oil, Ambient, Winding, Bearing and Other.
This parameter can only be set with DIGSI under Additional Settings.
Furthermore, in the 7UT613/63x an alarm temperature (stage 1) and a tripping tem-
perature (stage 2) can be set. Depending on the temperature unit selected in the
power system data in address 276 TEMP. UNIT, the alarm temperature can be se-
lected in degree Celsius (°C) in address 9013 RTD 1 STAGE 1 or in degree Fahren-
heit (°F) in address 9014 RTD 1 STAGE 1. The trip temperature expressed in Celsius
(°C) is set in address 9015 RTD 1 STAGE 2, and under address 9016 RTD 1 STAGE
2 it can be set in degree Fahrenheit (°F) .
Temperature Detec-
tors
The setting options and addresses of all connected temperature detectors for the first
and the second RTD-box are listed in the following parameter overview.
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