Baker D30R, User'S Manual & Operating Instructions

Page: 104 / 142

D30R Users Manual
104
Do Not Touch Test Leads while test is in Progress!
71-023 Rev C 5/8/2007
Fig 8-9: Single Phase Transformer Connections
3. Surge test the winding following the procedures outline for Single
Phase Motors and Two Terminal Devices. The discussion of
determining a fault applies.
NOTE: Secondary winding insulation problems are reflected into the primary
winding, and will be observed on the display.
4. After completing the test, reverse the test leads (connect test lead #2 to
H1 and test lead #1 to H2) and repeat the surge test. This is commonly
referred to as “shooting in the other direction”.
5.
Repeat this test process for each TAP position.
Three Phase Transformers
It is beyond the scope of this manual to cover all possible transformer
connections. It is important to remember that each line high side connection
point must be surge tested to the other end of its own coil, and that the
secondary side of the coil being surged must be shorted out (jumpered together
and to ground).
Note:
A wye-wye transformer with the star point internally tied can be surge
tested without opening the tie point.
1. Use TLS position #1.
2.
Connect the black ground test lead to the frame (ground) of the
transformer.