VOLTECH AT3600 USER MANUAL TRANSFORMER TESTS
TESTS AND TEST CONDITIONS VPN 98 - 024 PAGE 7.1.47.
Many transformer specifications require Hi-Pot testing to be carried out with a dwell
time of 60 seconds. Although the transformer must be designed and constructed to
meet this, it is common practice to reduce the dwell time for production testing.
This is recognised by IEC 742, which permits a dwell time of 2 seconds for
production testing. Although not required by IEC 742, it is good practice to increase
the test voltage by, for example, 10% when performing reduced-time testing, to
provide additional security for the test.
IEC742 has been replaced by IEC61558, which specifies 1 second for production
testing. Details are available on the IEC web-site (http://www.iec.ch).
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