The method of scaling algebras, which has been introduced earlier as a means
for analyzing the short-distance behaviour of quantum field theories in the
setting of the model-independent, operator-algebraic approach, is extended to
the case of fields carrying superselection charges. In doing so, consideration
will be given to strictly localizable charges ("DHR-type" superselection
charges) as well as to charges which can only be localized in regions extending
to spacelike infinity ("BF-type" superselection charges). A criterion for the
preservance of superselection charges in the short-distance scaling limit is
proposed. Consequences of this preservance of superselection charges are
studied. The conjugate charge of a preserved charge is also preserved, and for
charges of DHR-type, the preservance of all charges of a quantum field theory
in the scaling limit leads to equivalence of local and global intertwiners
between superselection sectors.