Three Phase Transformer Test - NDB Technologies NDB-DOC-3 User Manual

6.3 Three phase transformer test

Use the NDB-DOC-3 on de-energized transformers only.
1. Press the power button
2. Connect the test lead to the instrument.
3. Press the winding type selection button
mary winding configuration type, either Delta or Yn.
4. Press the kVA arrows keys to select transformer size.
5. Press the kV arrows keys to select the transformer's primary winding nom-
inal voltage.
6. Connect the four clamps to the transformer:
• Connect H1 clamp to transformer H1 terminal.
• Connect H2 clamp to transformer H2 terminal.
• Connect H3 clamp to transformer H3 terminal.
N D B - D O C - 3
to turn on the instrument.
Primary
H1
H1
H2
H2
H3
H3
N/GND/H0
GND
- U s e r M a n u a l
to select the transformer's pri-
Cutout switches must be open.
The power transformer must be
de-energized.
Secondary
X1
X2
X3
10
Load