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Attention:
03 Low ratio
—
this is hold generally, even if the base plate is re-
04 High ratio
moved. In case of disassembling the base plate,
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05 KOKS 12, KOKS 17.5
producer is not warranting the earthing. Cou-
shielding connection
pling electrode terminals Ck and PE are always
delivered interconnected. Remove this connec-
tion before installation of indication system.
Leave the connection if Ck-PE terminals are not
in use.
8.
All current and voltage transformers are, for
safety reasons, shipped with earthed second-
ary windings. Earthing of the terminals are
shown in Appendix 1. Before putting into op-
eration always check whether it corresponds
to the earthing scheme involved in the appli-
cation and remove earthing screws accord-
ingly (simple examples of network connection
are in Appendix 2 ).
Attention:
damage, loss and injuries caused by wrong con-
nection of transformers.
Mounting
Following informations are general and some de-
tails can differentiate according to type and vari-
ants of transformers. It is necessary to combine it
with other technical and marketing specifications
like catalogues, dimensional drawings and rating
plate for specific transformer type.
The mounting position of the indoor transformer
can be freely chosen. The transformer is fixed us-
ing the mounting base with four screws M10 and
washers. Fastening must be done on a smooth
surface. There is a M8 screw for earthing the trans-
former on the base plate.
Primary connection
Primary terminals of the current transformer are
made of copper and they are silver or tin plated.
There are M12 (CT) and M10 (VT) screws used for
fastening of primary conductor to the terminal.
For primary reconnectable transformers the ratio
can be reconnected by changing position of the
links fixed by M8 screws without removing already
fitted primary conductors.
Terminal PE must be always earthed,
Manufacturer is not responsible for
—
03
—
04
Screw
Max. torque [Nm]
M5
3.5
M6
4
M8
20
M10
20
M12
70
Tab. 1. Maximum allowed torques for screw connections of current
transformers
Maximum allowed torque for screw connection of
voltage transformer is 20 Nm.
Maximum allowed cantilever strength is:
Voltage transformers 2000 N.
Current transformers 5000 N.
In case of Bus CT, there must be always con-
nected CT shielding to the primary bar. Connec-
tion must be done on one side of the CT.
Shielding connection example of KOKS 12, 17.5 de-
scribed in picture 5 and for KOKS 24 in picture 6.
Connection cable 2.5 mm
—
05
5
Min. torque [Nm]
2.8
3
16
16
56
2
Primary bar
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