| |
| |
|
|
|
|
| |
|
| |
| |
 |
- Fully automatic; fast; easy-to-use;
handheld; robust; lightweight
- Battery powered with power-saving and
shutdown function
- Tests turns ratio, phase displacement,
excitation current, winding resistance
and polarity
- Meets all IP54 requirements
- RS232 for data transfer and printing
- Stores 200 test results and 100 userdefined
transformer test settings
- Six user-selectable languages
|
|
|
 |
| |
|
|
| |
| |
The Megger TTR100 is an automatic handheld, battery
operated transformer turns ratio test set used to measure
the turns ratio, excitation current, phase displacement, dc
resistance and polarity of windings in single- and threephase
distribution transformers (tested phase by phase),
potential & current transformers, and tapped transformers.
Deviations in the mentioned measurements will quickly
indicate problems in transformer windings or in the
magnetic core circuits.
The unique design of the TTR100 allows the user to
operate the test set while holding it in one hand. No other
transformer test set offers this capability. It effectively
eliminates the user from having the kneel or bend down
to operate the instrument and speeds up testing time.
Realizing the extreme environments in which the TTR100
must operate, special attention has been paid to making it
extra rugged, with a high impact, shock resistant case, yet
incredibly lightweight at 3.3 lb. (1.5 kg). It weights less
than any other commercially available instrument on the
market.
Its rugged and robust design makes this instrument well
suited for use in a variety of harsh environments. The
TTR100 is particularly suited for testing in substations and
transformer-manufacturing environments where testing
single and three-phase transformers can be performed.
The TTR100 provides reliable results, helping the user in
determining the condition of the transformer under test. It
features a high contrast LCD screen which can be seen in
bright or ambient light.
The TTR100 comes equipped with specially designed leads
which provide
the necessary flexibility needed in all
weather conditions.
This unit measures the highest turns ratio in the industry
with an accuracy of 0.1% or better and with the lowest
excitation voltage. No other instrument’s performance is
comparable that is commercially available today. Another
excellent feature of this TTR is the ability to accurately
measure phase deviation (in minutes or centiradians) of
the transformer primary versus secondary. This
measurement is also useful in verifying phase errors in PTs
and CTs.
The TTR100 features special software capabilities. It comes
equipped with sufficient onboard memory to store up to
200 test results (including test report header information)
in the field for later retrieval, as well as 100 user-defined
transformer settings. 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
(numerical, alphabetical, or alpha-numerical) for each test
performed.
The TTR100 comes with a Windows® based software
program that permits download of test data from the
instrument to a PC database. Data stored in the database
can be retrieved at a later date and test reports can be
printed to assist in the preparation of management and/or
analysis reports. These reports are easily transmitted via
e-mail. |
|
| |
| |
|
|
| |
| |
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 single- or a
three-phase transformer. It is also ideal to use for testing in
meter shops for the inspection of CTs and PTs. It can
determine the no-load accuracy of CTs and PTs and also
determine the need to further test faulty CTs and PTs.
The TTR100 applies voltage, with voltage ratio being
directly proportional to turns ratio, 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, percent ratio error, dc winding resistance and
polarity.
FEATURES AND BENEFITS
- Faster, easier handheld operation. User no longer has to
kneel or bend down to operate the instrument.
- Powered by rechargeable battery, provides up to fifteen
hours of field operation.
- Report header information such as company name,
substation name, transformer manufacturer, transformer
ratio, operator, temperature and %RH can be entered
and saved via the alphanumeric keypad.
- Measures the widest turns ratio range in the industry
(20,000:1) with the highest accuracy (±0.1%, 0.8 to 2000)
at a low excitation voltage.
- Enables the operator to enter the ratio of the transformer
and all of its taps. This allows the operator to know
immediately when a tap is outside the acceptable limits
so that problem taps can be easily identified.
- Records ratio errors for bushing CTs to an accuracy of
±0.1% nameplate. This reduces the need for additional
test equipment and improves set-up time.
- Measures the phase deviation (in minutes, degrees or
centiradians) of the transformer primary versus
secondary. This quickly indicates problems in the
transformer such as partial shorted turns and core faults.
This measurement is also useful in verifying phase errors
in all types of PTs and CTs.
- Perfect for meter shops, the TTR100 can be used for
inspection purposes by using it to determine the no-load
accuracy of most CTs and PTs. It also can be used to
determine the need to further test potentially faulty CTs
and PTs.\
- The TTR100 is ideal for use by transformer
manufacturers. Its unique testing procedures and storage
capability allows an operator to set up and test single
and three-phase transformers (with multiple tap
changers and bushing CTs) in minimal time.
- A “Quick Test” mode provides a fast determination of
the turns ratio, excitation current, phase angle deviation,
and winding resistance in single- and three-phase
transformers and CTs. In addition, polarity is provided
for CTs and single-phase transformers.
- Displays all measured and calculated values for each test
including ratio, excitation current, ratio error, phase
angle deviation, transformer vector group, winding
resistance and polarity thus providing comprehensive
and conclusive data
|
|
| |
| |
|
|
|
| |
|
| |
| Excitation Voltage: |
8 V rms for testing distribution or power transformers, PTs;
1.5 V ac RMS, or 8 V ac RMS for testing CTs.
The excitation voltage is switched automatically if excitation
current exceeds a preset value. |
| Test Frequency: |
55 Hz internally generated providing a universal 50/60 Hz test set |
| Excitation Current Range: |
0 to 100 mA, 4-digit resolution |
| Turns Ratio Range
: |
8 Vac: 0.8 to 20,000, 5 digit resolution (for transformers and PT
testing)
1.5 V ac: 5.0 to 2200, 5 digit resolution (for CT testing) |
| Phase Deviation Range
: |
±90º, 1 decimal point for the minutes display, 2 decimal points for
the degree display, or for the centiradian display |
Winding
Resistance Ranger: |
0 to 2000 Ω, 4 digit resolution |
| Transformer Vector Group: |
1PH0 or 1PH6 |
| Current (rms) accuracy: |
±(2% of reading + 1 digit) |
| Turns Ratio Accuracy
: |
±0.1% (0.8 to 2000)
±0.15% (2001 to 4000)
±0.20% (4001 to 10,000)
±0.25% (10,001 to 20.000) |
| Winding Resistance Accuracy: |
±(10% of reading + 1 digit) for 10 Ω to 2000 Ω range
±(10% ±1 mΩ) for 10 mΩ to 9.99 Ω range
±(10% ±0.5 mΩ) for 0.1 mΩ to 9.99 mΩ range |
| |
| Display full graphics
: |
LCD module, wide temperature range, 128 x 64 dots (21
characters by 8 lines) |
| PC/Printer Interface: |
RS232C port, 9-pin, 57.6 Kbaud (19.2 Kbaud for the printer) |
|
|
| |
| |
|
|
|
|
| |
| |
 |
|
|
|
|
| |
 |
|
|
|
|
Test Result Storage
Internal, nonvolatile memory for storing up to 200 sets of singlephase
measured and calculated ratio, exciting current, phase, ratio
error, winding resistance, polarity, vector group, plus header
information (company, substation, transformer manufacturer,
transformer rating, instrument serial number, temperature, relative
humidity, and operator name)
In addition, up to 100 user-defined transformer settings can be
stored.
Type of Power
Rechargeable NiMH battery pack, 3.6 V dc, 3800 mAh
Battery Life
15 hours of field operation
Charger input voltage
100-250 V ac, 50/60 Hz ±2 Hz Unit can be operated while
charging. Charging time is approximately three hours
Optional
charger source
Optional inverter 12 V dc to 115 V ac for powering a charger from
vehicle battery (non CE marked)
Computer Software
Included software for downloading of data to a PC, data storage
to database and report printout.
Test Leads
Supplied with one complete set of single-phase leads, 6 ft (1.8 m)
in length
Transformer Winding Phase Relationship:
ANSI C57.12.70-1978
CEI/IEC 76-1:1993 and Publication 616:1978
Standard)
Safety/EMC/Vibration
Meets the requirements of IEC-1010-1, CE and ASTM D999.75
Temperature Range
Operating: -4º F to 131º F (-20º C to 55º C)
Storage: -58º F to 140º F (-50º C to 60º C)
Relative humidity
Operating: 0 to 90% noncondensing
Storage:
0 to 95% noncondensing
Protective Devices
High voltage side shorting relays, transient voltage suppressors
and gas surge voltage protectors
Measuring Time:
8 to 20 seconds for a single-phase distribution transformer
Measurement Method: ANSI/IEEE C57.12.90
Dimensions:
9.5H x 4.5W x 1.875D in. (241H x 115W x 48D mm)
Weight:
Approx. 3.3 lbs (1.5 kg), instrument only, without leads
Protective Instrument Carrying Case:
Neoprene case with carrying strap and attachable pouch for
universal charger and 6 ft. (1.8 m) test leads, single-phase
connection (two leads for the H winding and three leads for the
secondary winding with tap).
|
|
| |
| |
|
|
.jpg){kind=small}
.jpg){kind=small}
