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Ring Type Current Transformers (Toroidal)
 
These kinds of current transformers are constructed in a range of burdens and accuracy classes for each transformer ratio (up to 6000 Amp), thereby enabling the designer to select a transformer suitable for measuring, protection and core balance applications.
 
The following information is required when ordering ring type measuring and protection current transformers according to IEC60044-1:
a-       Transformer ratio
b-      The VA burden
c-      Class(measuring), class of accuracy and accuracy limit factor(ALF)
d-      Minimum inner diameter (ID)
 
 For core balance applications the following information is required:
a-       Transformer ratio
b-      Minimum inner diameter
For example (50/1; Cl. 3, 1VA, ID 130 mm)

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