M
AVTMTTR310 Rev 8 May 2016
2
General Information
The Three-Phase TTR
®
310 Test Set is fully automatic, self-checking, self-
calibrating, menu-driven unit. The test set measures the turn ratio, phase shift,
and excitation current of power, distribution, and instrument transformers. A
“-47” suffix added to the catalog number denotes a 230-V, 50 Hz input power
supply, rather than the standard 120-V supply. The test set is a portable
instrument housed in a sturdy plastic case with lid and carrying strap. The inside
bottom half of the case is nickel coated. A canvas carrying bag is supplied to hold
all accessories.
The test set can be used to test single-phase and three-phase transformers, both
with and without taps in accordance with the requirements of the IEEE
C57.12.90 – 2013, IEC 60076-1 and CIGRE TB 445 standards. For three-phase
measurements, the test set is connected to all Three-Phases of the transformer to
be tested. The TTR310 lead selection circuitry permits automatic measurement
of all phases without changing connections. This feature eliminates the need to
refer to hook-up charts when testing three-phase transformers. Turn ratio, phase
shift and excitation current readings are displayed on a large LCD. Transformer
excitation current as well as phase shift angle helps to detect transformer shorted
turns or an unequal number of turns connected in parallel. Operating condition
(error) messages identify incorrect test connections, abnormal operating
condition, or winding problems. Test results can be saved, printed out on an
optional printer, or uploaded to a personal computer (PC).
Features include:
Fully automatic operation.
Self-checking at power-up.
Self-calibration at each measurement.
User-friendly, menu-driven operation.
Test turn ratio, phase shift (in both degree and centiradian), and excitation
current.
Easy measuring of regular windings, tertiary windings, and CTs.
Storage capacity for up to 200 tests for retrieving, printing out, or uploading
to a PC.
Saving up to 9 custom transformer settings for faster and easier testing.
Checking reverse polarity at start of each test.
External printer records test data.
External PC or laptop can be connected instead of a printer to transfer test
results and to provide full transformer test report.
Quick test mode provides the fastest testing of a transformer.
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