TTR®300 Series
Three-Phase Transformer Turns Ratio Test Sets
TTR®300 Series
3-Phase Transformer Turns Ratio Test Sets
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Stand-alone or remote-control operation
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Accurately measures ratio, phase deviation
and exciting current
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Field upgradeable without compromise to
calibration
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Built-in capability for storing and downloading
test results in an XML format, via RS-232,
Ethernet or USB ports (depending on model)
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Works in the presence of high interference/
high voltage
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Highest ratio measurement (45,000:1);
TTR330 shown
highest accuracy (0.1%)
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Displays % error vs. name plate with pass/fail
limits
DESCRIPTION
The TTR300 Series of three-phase transformer turns ratio
test sets are designed to measure the turns ratio of power,
instrument, and distribution transformers in a substation or
manufacturing environment. A rugged and robust design
makes these instruments well suited for use in a variety of
harsh environments. Our leads are specially designed to
provide the necessary flexibility needed in cold weather.
The TTR300 Series are ideal for use by power transformer
manufacturers. Their unique testing procedures and storage
capability allows an operator to set up and test difficult
three-phase transformers (with multiple tap changers and
bushing CTs) in a fraction of the time than it used to take
with other TTRs. This test also includes a pass/fail limit of
individual ratios.
The TTR300 Series also measure the phase deviation 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.
Each unit comes equipped with a remote-control switch
for single person testing. This allows the operator to test
transformers with LTCs very quickly.
The Series consists of four instruments:
TTR300
The TTR300 is designed to be completely remote
controlled via a PC running PowerDB LITE (included)
or PowerDB (full version) PC software applications. The
TTR300 is field upgradeable to the TTR310, TTR320 or
TTR330.
Some of the features of the TTR300 are:
n Field upgradeable to a model TTR310, TTR320 or TTR330
without compromise to calibration
n Built-in capability for storing test results into internal
memory in an open XML data format via PowerDB LITE
n Quickly download test results via RS-232 serial port
TTR300 — remote controlled “black box” unit
TTR310 — text-based LCD interface unit
TTR310
This unit features an easy-to-read, high-contrast LCD
which can be seen in bright sunlight and provides the
user interface for instrument set-up and test operation.
The unit comes complete with the software application,
PowerDB LITE.
The TTR310 has the ability to store test results, upload
results to a PC (via RS232 serial port), and/or print them
in the field via optional thermal paper printer, without the
use of an external computer.
Some of the features of the TTR310 consist of:
n Fully automatic operation (either stand-alone or
remote-control)
n Field upgradeable to a TTR330 or TTR320 without
compromise to calibration
n Built-in RS-232 port and optional thermal spool-paper
printer allows for printing of test results, while in the
field, and without the use of an external computer
n Built-in capability for storing test results into internal
memory in an open data format for direct input into
®
Excel
or XML format via PowerDB LITE
TTR®300 Series
Three-Phase Transformer Turns Ratio Test Sets
TTR320
The TTR320 features a high contrast bright 5.7” full VGA
color display that can be seen in direct sunlight. The
instrument employs a full QWERTY keyboard for entering
nameplate-type information. Communications ports are
provided in the form of RS-232, USB and Ethernet ports for
easy on-board printing, storage, and downloading of test
results.
Also, with a simple interface to PowerDB LITE PC software
application (included), the user can perform data analysis
and trending of results.
The TTR320 includes the following features:
n Fully automatic operation (stand-alone or remote-
control)
n Field upgradeable to a model TTR330 without compromise
to calibration
n Graphical User Interface allows for automated setup and
control through easy-to-read ICON based screens
n Built-in capability for storing test results, in an open XML
format, to either internal memory or to an external USB
storage device
n Built-in RS-232 port and optional thermal spool-paper
printer allows for printing of test results, while in the field,
and without the use of an external computer
n 5.7” VGA bright color display
TTR330 shown testing a pad mount three-phase transformer
TTR320 — graphical ICON based user interface unit
TTR330
The TTR330 offers a new user interface which allows
the operator to interact with the PowerDB ONBOARD
software system via full QWERTY and navigation keypads
as displayed on an 8.4” VGA bright-color screen. One of
the primary benefits of this interface is that it displays the
actual test form on the screen. An advanced feature of the
TTR330 allows the user to customize these test forms via
optional full-version PowerDB.
Other primary features of the TTR330 include three
communications ports (two USB, one Ethernet). The USB
“host” ports can be used for connecting directly to an
optional printer (to print full size 8.5” x 11” completed test
forms) and for data storage to a USB memory device (for
later printing, analysis, archiving, and/or trending). The
Ethernet port allows the TTR330 to interface (on a bidirectional basis) directly to a PC.
TTR®300 Series
Three-Phase Transformer Turns Ratio Test Sets
The TTR330 offers the following:
n Fully automatic operation (stand-alone or remote-control)
with user interface via on-screen customizable test forms
n Integrated PowerDB ONBOARD allows for data analysis
and trending while in the field without the use of an
external computer
n Built-in USB port and optional USB printer allows for
8.5”x 11” test forms printing without the use of a laptop
n Built-in capability for storing test results, in an open XML
format, to either internal memory or to an external USB
storage device
n Full 8.4” VGA color display
PowerDB LITE™ Acceptance & Maintenance
Test Data Management Software
All four units in the TTR300 Series come complete, at no
extra charge, with PowerDB LITE (a new powerful PC
Windows
®
based software program). PowerDB LITE allows
the operator to completely program a test routine, in
advance, for a transformer, save it under the transformer ID
number, and then recall it in the future as required.
Testing on the TTRs can be performed in a remote control
manner, via PowerDB LITE. Once testing is complete on
all of the instruments, results are easily downloaded to the
external PC in an “open” XML data format. The instruments’
internal memory also maintains historical data-files so that,
through interface to PowerDB LITE, current and past results
can be archived, compared, analyzed, displayed in trend
charts, and compiled into Test Reports.
Control of the TTRs in this remote-control manner offers
the following benefits:
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Easy to use interface between operator and instrument.
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Problems such as PASS/FAIL are flagged visually using a
RED highlight.
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Easily recall transformer setups from a custom settings
menu.
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Quickly download results to the PC for completing a
transformer test report.
PowerDB™ (full version) Acceptance &
Maintenance Test Data Management Software
As an enhancement over the PowerDB LITE software
(described above), a powerful “full version” PowerDB
software is also available on the TTR300 Series as an
option. PowerDB LITE and the internal architecture of
the TTR Series has a seamless interface to the full version
PowerDB, PC based software application.
Multiple data files (from multiple instruments) can
automatically be fed to PowerDB in order to generate
comprehensive asset analysis in the form of Reports
containing table of contents, test data sheets, commentary,
and deficiency summaries.
Electrical utilities who have invested in sophisticated
Computerized Maintenance Management Systems (CMMS)
can easily link with the PowerDB software because it
works with a number of systems.
PowerDB™ ONBOARD Acceptance & Maintenance
Test Data Management Software (Model TTR330
only)
The “PowerDB ONBOARD” logo means PowerDB software
is running on a computer embedded within the TTR330.
This powerful feature provides the TTR330 with
a common “User Interface” to minimize operator training
and provides a seamless interface to the full PowerDB
(PC version) application.
Easy-to-read on-screen test forms provide the user interface
for instrument set-up and test operation. Results are
displayed against pass/fail nameplate limits and can be
stored (either internally or to a USB storage device) in an
open XML data format.
The ONBOARD software also maintains a historical data
file so that, while in the field, current and past results can
be analyzed, compared, and displayed in trend charts
without the need of an external computer. An 8.5” x 11”
test form can also be printed in the field via an optional
USB printer, and without the use of an external computer.
Built-in Memory
The TTRs come equipped with sufficient internal memory
to store test results. The outcome of the results are based
on the model:
TTR310: stores up to 200 three-phase data sets in the field
for later retrieval. Test results can be printed on an optional
printer (using thermal spool paper) whenever a hard copy
is desired, or the data can be downloaded to a PC for
archiving, analysis, trending, and/or printing. The system
software allows entry of the transformer alphanumeric
serial number, transformer type and tap information for
each test performed.
TTR320: stores up to 100,000 data sets in the field for
later retrieval. Test results can be printed on an optional
printer (using thermal spool paper) whenever a hard copy
is desired, or the data can later be downloaded to a PC for
archiving, analysis, trending, and/or printing. 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.
TTR330: stores up to 100,000 data sets in the field for later
retrieval. Test results can be printed on an optional in-lid
printer (using 8.5” x 11” thermal paper) whenever a hard
copy is desired, or the data can later be downloaded to
a PC for archiving, analysis and/or printing. 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.
TTR®300 Series
Three-Phase Transformer Turns Ratio Test Sets
APPLICATIONS
The TTR300 Series 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 units measure excitation current, phase
angle deviation between the high- and low-voltage
windings and percent ratio error.
Transformer Turns Ratio
Transformer turns ratio is the ratio of the number of
turns in the high-voltage winding to that in the lowvoltage winding. Complexity in the measured ratio versus
nameplate ratio occurs with most three-phase power
transformers because multipliers such as √3 are required
to match the measured ratio to the nameplate ratio. The
TTR300 Series automatically applies the multiplier in a
form which allows the operator a direct comparison to
the nameplate (or expected) ratio. The built-in calculator
displays the % error versus nameplate for each tap and
each winding, without the need for a computer.
Exciting Current
The TTR provides accurate measurement of exciting current
(to 0.1 mA) which can help provide information about the
condition of a transformer’s core. Unwanted circulating
currents or unintentional core grounds can increase the
exciting current and indicate a problem.
Phase Angle Deviation and its Application
The phase angle deviation, displayed in either degrees
(minutes) or radians, is the phase relationship between the
voltage signal applied to the high-voltage winding and the
voltage signal extracted from the low-voltage winding. The
phase deviation, together with ratio error, can be used as a
low-cost method of verifying accuracy class of all types of
PTs and CTs at “zero burden.”
The phase deviation between the high and low side of a
transformer is generally very small. If there is deterioration
or damage in the transformer core, however, the phase
deviation can change significantly. The three-phase TTR
can measure this phase relationship with the resolution
of 0.1 minutes (equal to 1/600 of a degree), which is
necessary to detect problems.
SPECIFICATIONS
Input Power
120/230 V ac ±10%, single phase, 50/60 ±2 Hz 100 VA
Battery Operation (Optional)
Inverter 12 V dc to 120 V/230 V ac for operation from vehicle battery
Excitation Voltage
8, 40, or 80 V rms, automatically or manually selected
Excitation Current Range and Accuracy
0 to 500 mA, 3 digit resolution, ±(2% of reading + 1 digit)
Phase Deviation Range and Accuracy
±90 degrees, 1 decimal point for the minutes display, 2 decimal
points for the degree display, or for the centi-radian display
Accuracy: ±3 minutes
Turns Ratio Range and Accuracy
8 V ac: ±0.1% (0.8 to 2000)
±0.25% (2001 to 4000)
±0.35% (4001 to 8000)
40 V ac: ±0.1% (0.8 to 2000)
±0.15% (2001 to 4000)
±0.3% (4001 to 10,000)
±0.35% (10,001 to 25,000)
80 V ac: ±0.1% (0.8 to 2000)
±0.15% (2001 to 4000)
±0.25% (4001 to 10,000)
±0.30% (10,001 to 45,000)
Resolution: 5 digit for all ratios
Printer Interface
TTR300: Not applicable
TTR310: RS-232 port
TTR320: RS-232 port
TTR330: USB
Computer Interface
TTR300 and TTR310: RS-232 port
TTR320 and TTR330: Ethernet
User Interface
TTR300: Not applicable
TTR310: 5.7 in., B&W display, text on-screen view,
numeric keypad
TTR320: 5.7 in., full-color VGA, graphical icon on-screen view,
full QWERTY keypad and navigational pushbuttons
TTR330: 8.4 in., full-color VGA, test forms on-screen view,
full QWERTY keypad and navigational pushbuttons
Internal Data Storage
TTR310: up to 200 data sets
TTR320 and TTR330: up to 100,000 data sets
Communication/Control Software
PowerDB LITE and PowerDB (full version, optional)
TTR330: PowerDB ONBOARD
Transformer Winding Phase Relationship
ANSI C57.12.70-1978
CEI/IEC 76-1:1993 and Publication 616:1978
AS-2374, Part 4-1982 (Australian Standard)
Safety/EMC/Vibration
Meets the requirements of IEC-1010-1, CE and ASTM D999.75
Temperature Range
Operating: 23° F to 122° F (-5° C to 50° C)
Storage: -58° F to 140° F (-50° C to 60° C)
Relative Humidity
0 to 90% noncondensing
Measuring Time
8 to 20 seconds depending on mode of operation and
type of transformer
Measurement Method
ANSI/IEEE C57.12.90
Dimensions
8.5 H x 21.5 W x 13 D in.
(216 H x 546.1 W x 330.2 D mm)
Weight
Instrument only, not including leads
TTR300: 20 lbs (9.1 kg)
TTR310: 23 lbs (10.4 kg)
TTR320: 25 lbs (11.3 kg)
TTR330: 25 lbs (11.3 kg)
FEATURES AND BENEFITS GUIDE
TTR®300 Series
Three-Phase Transformer Turns Ratio Test Sets
TTR300
TTR310
TTR320
TTR330
Field upgradeable/interchangeable to any other TTR in the
Series without compromising calibration (patent pending)
Remote controllable
Works in the presence of high interference/high voltage
Displays % error vs. name plate with pass/fail limits
n n n n
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Measures the widest turns ratio range in the industry
(45,000:1) and provides the highest accuracy (0.1%)
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Enables operator to enter the ratio of transformer and all
of its taps letting operator know immediately when a tap
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is outside acceptable limits so problem can be flagged
Equipped with “Remote TEST” switch for single person
testing, allowing the operator to test transformers with
n
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“LTCs” very quickly
Measures phase deviation of the transformer primary
versus secondary; quickly indicates problems in the
n
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n
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transformer such as partial shorted turns and core faults.
Useful in verifying phase errors in PTs and CTs
Rugged, lightweight design ideal for a harsh field and
substation environment
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User selectable standards: ANSI, IEC, and Australian.
Meets IEC 1010 and other standards such as CSA and UL
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“Quick Test” mode provides a fast determination of
turns ratio for single- and three-phase transformers
Units can be operated while in transit case
Leads can stay connected while in transit case
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Printing of test results without the use of a computer N/A 4” thermal 4” thermal 8.5” x 11”
spool paper spool paper thermal paper
Software
PowerDB LITE
n
n
n
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“PowerDB ONBOARD” allows for operation of
the unit through on-screen customizable test
forms (patent pending)
Full version PowerDB Optional Optional Optional Optional
n
Communications port
Printer interface N/A RS-232 RS-232 USB
Internal data storage (data sets) N/A 200 100,000 100,000
External storage device N/A N/A USB USB
Computer interface RS-232 RS-232 Ethernet Ethernet
User interface
Display type N/A 5.7” B&W 5.7” color VGA 8.4” color VGA
On-screen view N/A Text Graphical icons Test forms
Keypad N/A Numeric QWERTY QWERTY
ORDERING INFORMATION
Item (Qty) Cat. No.
Three-Phase TTR, remote controlled TTR300
Three-Phase TTR, stand alone or remote controlled TTR310
Three-Phase TTR, graphical user interface TTR320
Three-Phase TTR with PowerDB ONBOARD TTR330
Note: 120 V 50/60-Hz operation standard.
For 230 V, 50/60-Hz operation Add -47 to Cat. No.
Included Accessories
Canvas carrying bag for test leads 30915-211
Power supply cord, 8 ft (2.5 m), 120 V 17032-4
Power supply cord, 8 ft (2.5 m), 230 V 17032-13
Ground lead, 15 ft (4.6 m) 4702-7
Hand-held TEST switch assy
for remote operation 30915-220
PowerDB LITE software
RS232 cable for connecting to a PC
for use with TTR300, TTR310 and TTR320 CA-RS232
Ethernet cable for connecting to a PC
for use with TTR320 and TTR330 36798
Bushing clips (6) MC7144
Transformer Vector Voltage Diagram Set
(for ANSI, IEC, and AS Standards) for TTR310 35314
Spare fuse kits:
for TTR300 and TTR310 35026-3
for TTR300-47 and TTR310-47 35026-4
for TTR320 and TTR330 35026-5
for TTR320-47 and TTR330-47 35026-2
Instruction manuals:
for TTR300 AVTMTTR300
for TTR310 AVTMTTR310
for TTR320 AVTMTTR320
for TTR330 AVTMTTR330
TTR®300 Series
Three-Phase Transformer Turns Ratio Test Sets
Item (Qty) Cat. No.
Optional Accessories
PowerDB software, 1st machine license, soft key DB1001
PowerDB, 1st machine license, USB dongle DB1001S
TTR check box 550555
3-ø lead set adapter to allow use of
Megger TTR C/N 550503 lead set (30915-xxx) 37087
3-ø TTR calibration standard 550055
3-ø shielded test lead set,
X and H winding, 30 ft (9.1 m) 37093
3-ø shielded test lead set,
X and H winding, 50 ft (15 m) 37094
1-ø shielded test lead set,
X and H winding, 30 ft (9.1 m) 37095
Inverter with 3 ft (0.91 m) cigarette adapter cord
12 V dc to 120 V ac, 60 Hz 35271-1
12 V dc to 120 V ac, 50 Hz 35271-3
12 V dc to 230 V ac, 60 Hz 35271-2
12 V dc to 230 V ac, 50 Hz 35271-4
TTR printer package for TTR310, TTR320
120 V, 60 Hz 1001-390
230 V, 50 Hz 1001-401
USB portable thermal printer (120V) for TTR330 36493-1
USB portable thermal printer (230V) for TTR330 36494-1
Thermal paper (8.5” x 11”) for printer 36809-1
Thermal paper (A4) for printer 36809-2
Replacement/spare battery pack for printer 37077
Transit case (for instrument, leads and accessories) 37009
Field upgrade kits
TTR330 interface panel 37089-1
TTR320 interface panel 37089-2
TTR310 interface panel 37089-3
TTR300 interface panel 37089-4
UK
Archcliffe Road, Dover
CT17 9EN England
T +44 (0) 1 304 502101
F +44 (0) 1 304 207342
UKsales@megger.com
UNITED STATES
4271 Bronze Way
Dallas, TX 75237-1019 USA
T 1 800 723 2861 (USA only)
T +1 214 333 3201
F +1 214 331 7399
USsales@megger.com
OTHER TECHNICAL SALES OFFICES
Valley Forge USA, College Station
USA, Sydney AUSTRALIA, Täby
SWEDEN, Ontario CANADA, Trappes
FRANCE, Oberursel GERMANY, Aargau
SWITZERLAND, Kingdom of BAHRAIN,
Mumbai INDIA, Johannesburg SOUTH
AFRICA, and Chonburi THAILAND
ISO STATEMENT
Registered to ISO 9001:2000 Cert. no. 10006.01
TTR300SERIES_DS_USen_V04
www.megger.com
Megger is a registered trademark
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