Baker D30R, Руководство пользователя

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Surge Test Applications
12/3/2009 | 71-022 V6
D30R 62
Single phase transformers
1) Jumper (or short out) the secondary side (low side) of the transformer.
2) Select test lead #1. Follow the diagram below to connect test lead #1 to H1 and to
H2 of the transformer. The black GRD lead and test lead #G go to the frame.
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.
1) 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”.
2)
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 test lead #1.
2)
Connect the black ground test (GND) lead to the frame (ground) of the transformer.
3) Follow one of the charts below for connections for wye-wye or delta-wye
transformers. The transformer windings should be surge tested for all the
configurations shown.
4) Test procedures follow identically as for Single Phase transformer testing (refer to
Single Phase Motors and Two Terminal Devices).
Determination of a fault
The determination of a fault when surge testing a transformer winding follows that of the
Two Terminal Device (refer to Single Phase Motors and Two Terminal Devices).
Wye-Wye Transformers
Test Lead #1 Test Lead #2 Jumper
H1
H2
H3 HO
HO
HO XO to X1
XO to X2
XO to X3
Delta-Wye Transformers
Test Lead #1 Test Lead #2 Jumper
H1
H1
H2
H2
H3
H3 H2
H3
H1
H3
H2
H1 XO to X2
XO to X1
XO to X2
XO to X3
XO to X3
XO to X1