INFO:
INFO:
Residual magnetism may produce misleading excitation current values when
these are used solely as a criterion of the condition of the magnetic circuit of
a transformer. Although some residual magnetism is almost always present
in the core, in most cases it has no significant effect on test results. If
residual magnetism exists, then it is recommended that the core be
demagnetized before performing the test. Often, residual magnetism is
introduced as a result of a dc winding resistance test. It is recommended to
perform excitation current tests before any test that may introduce residual
magnetism.
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