Delta Transformer Bank Test - NDB Technologies NDB-DOC-3 User Manual

6.4 Delta Transformer bank test

Use the NDB-DOC-3 on de-energized transformers only.
1. Turn on the instrument by pressing the power button
2. Connect the test lead to the instrument.
3. Press the winding type selection button
transformer's primary winding.
4. Press the kVA arrows keys to select the transformer size.
5. Press the kV arrows keys to select the transformer's pri-
mary winding nominal voltage.
6. Connect the four clamps to the transformer:
• Connect H1 clamp to first transformer H1 terminal.
• Connect H2 clamp to second transformer H1 terminal.
• Connect H3 clamp to third transformer H1 terminal.
• Connect GND clamp to neutral or ground.
• Refer to next figure.
7. Press the start button
H1
H1 H2
H1
X3 X2 X1
N D B - D O C - 3
.
H2
H1 H2
X3 X2 X1
Load
- U s e r M a n u a l
to select delta
Cutout switches must be open.
The power transformer must be
de-energized.
H3
H1 H2
GND
X3 X2 X1
12
.
GND