AVTMTTR330 Rev 3 March 2010
11
4
Connecting to the Transformer
The setup and connection instructions included in Section 4 pertaining to ratio,
polarity, and phase relation, assume that the transformer under test, connections,
and terminal markings comply with the requirements of ANSI C57.12.70-1990
American National Standards Terminal Markings and Connections for
Distribution and Power Transformers. The H test leads of the test set are the
exciting (high voltage) leads (8 V, 40 V, or 80 V). The X test leads are the low
voltage leads.
When testing high-voltage transformers, caution must be used at all times and all
safety precautions followed. Read, understand, and employ all safety precautions
and circuit connections described in Sections 2 and 3.
F
WARNING
Ensure that the transformer to be tested is completely
de-energized. Check every winding. Ensure that all
terminals of the transformer are disconnected from line
or load at the transformer. Connections to ground may
be left in place.
F
WARNING
For all testing as described herein, care shall be taken
to ensure any and all unused clamps shall be isolated
from each other, from ground, and from personnel.
F
WARNING
Except for CTs as described herein, never interchange
connections between the high- and low-voltage
transformer terminals. Failure to observe proper
connections will result in a safety hazard and may
result in damage to the test set or transformer.
Single-Phase, Two-Winding Transformers
Perform the following setup procedure for single-phase, two-winding
transformers:
1. With the ON/OFF Switch in the OFF position, make the circuit
connections as described in Section 3.
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