3. Tests
The tests to be carried out on instrument transformers are defined in IEC standards 44-1 to 44-5. However, they are generally specified in the specifications, in addition to the standards cited as references.
There are essentially two categories of test:
individual (or routine) tests, carried out on all units;
type testing, carried out on a single unit of each type, to demonstrate that all transformers built to the same specification satisfactorily meet the requirements not checked by the individual tests.
3.1 Individual tests
They generally involve checking steady-state accuracy and monitoring dielectric strength at power frequency....
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