1.4 Special equipment
1.4.1 Primary reconnection
Primary reconnection is possible with current transformers and com‐
bined current and voltage transformers with multiple primary wind‐
ings. Depending on the customer's requirement, it can be carried out in
a ratio of 1:1, 1:2 and 1:4.
NOTICE
Reconnection is provided by parallel or series connection of the
primary winding via reconnecting tabs in the
primary connection area. The power ratings, the overcurrent lim‐
iting factor and the secondary internal resistance values remain
unchanged with primary-side reconnection.
Circuit diagram for the primary reconnection
If the transformer is reconnectable on the primary side, the asso‐
ciated circuit diagram is located near to the primary conductor on
the head housing.
1.4.2 Secondary tapping
To change or vary the transformation ratio of a transformer, not only
the start and end of a winding are connected to the terminal, but also
one or more of its parts.
In transformers, usually the secondary windings, and less frequently
the primary windings, are tapped
Ò
Primary reconnection.
Fig. 4: Circuit diagram secondary tapping
ICO 72,5...245
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