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Description
The Three-Phase Automatic TTR is
designed to measure the turns ratio of power, instrument, and
distribution
transformers in a substation or manufacturing environment. At 16.5
lbs (7.5 kg), it weighs less than any other
commercially available instrument. A rugged and robust design makes
this TTR well suited for use in a variety of
harsh environments. The TTR is also particularly suited for testing
in power transformer manufacturing environments where testing of
complex, three-phase substation power transformers can be performed
quickly while minimizing the possibility of errors.
This new TTR measures the
highest turns ratio range in the industry (10,000:1) and also
provides the highest accuracy (0.1%). No other instrument’s
performance is comparable that is commercially available today.
Another excellent feature
of this new TTR is the ability to measure phase deviation (in
minutes or centiradians) of the transformer primary versus
secondary. This will quickly indicate problems in a transformer such
as partial
shorted turns and core faults. This measurement is also useful in
verifying phase errors of all types of PT's and CT's.
The TTR also features
special software capabilities. The TTR comes equipped with
sufficient onboard memory to
store up to 200 test results in the field for later retrieval in the
office. Test results can be printed on an optional serial printer
whenever a hard copy is desired, or the data can be downloaded to a
PC. Identification of individual test readings is also easily done.
The system software allows entry of the transformer alphanumeric
serial number, transformer type and tap information for each test
performed.
This new TTR also comes
with a unique optional, remote control software program. This
Windows® based program permits control and operation from a PC
keyboard, download of test data from the TTR to a PC, print out a
test results report and assist in the preparation of management
and/or analysis reports using either Excel® or Access®.
Realizing the extreme
environments in which the TTR must operate, special attention has
been paid to making it extra rugged (with a hard, shock resistant
case), yet incredibly light weight (16.5 lbs). It features a high
contrast LCD screen which can be seen in bright or ambient light and
comes equipped with specially designed leads which provide the
necessary flexibility needed in cold weather conditions.
Applications
The proper operation of a
transformer relies almost entirely on the electrical properties of
its windings. To ensure continued proper operation, transformers are
tested to verify that their electrical properties have not changed
from design specifications.
A TTR is an extremely
useful instrument for testing transformer windings, because it can
locate several types
of problems within a transformer. It is also ideal to use for
testing in Meter shops for the upcoming inspection of CT's and PT's.
It can determine the no load accuracy of all CT's and PT's and also
determine the need to further test faulty CT's and PT's.
The new TTR applies voltage
to the high voltage winding of a transformer and accurately measures
the resulting
voltage from the low voltage winding. In addition to turns ratio,
the unit measures excitation current, phase angle deviation between
the high and low voltage windings and percent ratio error. |
