GEAFOL- / CARECO-Cast-resin Transformer/ Operating Instructions
© 2021 Siemens Energy
Page 16
6.7
Grounding of transformers
Make sure that the necessary grounding connection is in-
stalled on accessories that are conected to the transformer
after installation. Transformer housings must also be
grounded in accordance with the known grounding specifi-
cations.
The grounding screws are located on the front sides of the
lower press frame (see Fig. 6.5). A PE wiring must be con-
nected here at one position. The dimensioning of the PE
wiring is defined by specific regulations at the installation
site.
For transformers with housing, corresponding grounding
connections are located on the outside of the housing.
6.8
Temperature monitoring
The measuring sensors in the temperature monitoring sys-
tem record the winding temperature. This acts as overload
protection against excessive heat generation in the trans-
former windings.
The temperature monitoring system consists of PTC ther-
mistors, according to DIN 44082 or resistance thermome-
ters (PT100) in accordance with IEC 60751, and the associ-
ated monitoring devices.
The terminal box, the connection diagram of the tempera-
ture monitoring and the specification of the limit tempera-
tures are located on the upper press frame as standard
(Fig. 6-6).
The temperature values for the warning, alarm triggering
or fan control functions must be set on the triggering de-
vice or monitoring system.
6.9
Monitoring devices (Option)
For the activation of error messages on the basis of the
sensor signals, different triggering devices are offered for
GEAFOL/CARERCO transformers, depending on the type
and number of sensors.
For transformers with housings as part of the scope of sup-
ply, the tripping devices are located in the control cabinet
of the housing.
Information for connection and operation of the monitor-
ing devices can be found in the respective operating in-
structions.
Test the function of the triggering devices during commis-
sioning.
Fig. 6-6: Terminal box, connection diagram and limit tem-
peratures on upper press frame (EXAMPLE)
Fig. 6-7: Display of monitoring device (EXAMPLE)
Fig. 6-5: Grounding connection
