– reduces its sensitivity and
– increases the share of magnetic fields resulting from other
currents flowing in its vicinity.
This is of still more importance in three phase currents, for
which the transformers are designed.
The optoelectronic transformers are deprived of these restrictions.
The optical measuring probes may be placed rather
close to the conductors of the current, without disturbing the
distribution of the magnetic fields. Consisting fully insulating
material, the optical transformers warrant operational safety.
There is still another advantage resulting from the application
of the optoelectronic transformers, viz. the possibility of noninvasive
measurements. The idea of constructing a measuring
probe for the optoelectronic current transformer is to be seen
in Fig. 2.