5.2 Standard short-duration power-frequency withstand voltage tests
A standard short-duration power-frequency withstand voltage test consists of one
application of the relevan! standard withstand voltage to the terminals of the insulation
configuration.
Unless otherwise specified by the relevant apparatus committees, the insulation is
considered to have passed the test if no disruptive discharge occurs. However, if one
disruptive discharge occurs on the self-restoring insulation during a wet test, the test may
be repeated once and the equipment is considered to have passed the test if no further
disruptive discharge occurs.
When the test cannot be performed (such as for transformers with non-uniform insulation),
the relevant apparatus committees may specify frequencies up to a few hundred hertz and
durations shorter than one minute. Unless otherwise justified, the test voltages shall be
the same.