AVTMTTR310 Rev 8 May 2016
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5
Setup and Connections
General Instructions
When testing high-voltage transformers, caution must be used at all times and all
safety precautions followed. Read and understand all safety information
contained in Section 2, Safety.
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.
The following setup and connection instructions pertaining to ratio, polarity, and
phase relation assume that the transformer under test, connections, and terminal
markings comply with the requirements of ANSI C57.12.70-2011 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).
Single-Phase, Two-Winding Transformers
WARNING
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.
Perform the following setup procedure for single-phase, two-winding
transformers:
1. Connect the wing-nut ground terminal of the test set to a low-impedance
earth ground using the 15-ft (4.6 m) ground lead supplied.
2. Connect the H and X test cables to the respective H and X receptacles of the
test set. Make sure that the connectors are screwed tight to the receptacles.
3. Connect the heavy-duty clips marked H1 and H2 of the test lead to the
corresponding (high-voltage winding) terminals of the transformer under
test.
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