Atec MTO3XX User Manual
MTO3XX Series
Automated Six-Winding
Transformer Ohmmeter
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One-time connection principle results in a 4x
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Automated eight-terminal/six-winding
MT0330 (PowerDB Onboard)
MTO300 (use with
external PC with
PowerDB)
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Interchangeable lead set with the Megger
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Simultaneous winding magnetization for
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Built-in auto-demagnetization
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On-load tap changer operation testing
MTO3XX Series
Six-Winding Transformer Ohmmeter
faster setup time eliminating over 70% of safety
risk*
measurement capability
3-phase series of TTRs
fast and accurate dc winding resistance
measurements of high inductive loads
DESCRIPTION
The MTO3XX series delivers full eight-terminal/sixwinding resistance measurement capability. It is designed
to save time by testing all six windings without having to
disconnect and reconnect leads. Also, the simultaneous
winding magnetization (SWM) method gives fast and
reliable measurements even on large transformers with
delta configuration on the low voltage side. Additionally,
the MTO3XX series leads are interchangeable with
the Megger TTR300 series of three-phase turns ratio
instruments which eliminates additional connecting time for
turns ratio measurements.
The MTO3XX series consists of two models:
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The base model, MTO300, is designed to be remote
controlled via PowerDB software on an external PC
or a Megger transformer test product with on-board
computer.
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The MTO330 offers the same functionality as the
MTO300. However, it is equipped with an onboard
computer featuring full QWERTY keyboard and
navigational pushbuttons as displayed on an 8.4 inch
full-color VGA transflective screen viewable in bright
Modular Testing
The MTO3XX series is the latest addition to Megger’s
extensive line of products with a common digital platform,
allowing users the ability to link with other compatible
Megger transformer test instruments.
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The MTO300 can be controlled by an external PC or
other Megger products with on-board computer such as
the DELTA3000, DELTA4310, TTR330, and FRAX150.
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MTO330 has an internal computer and can be used
to control other Megger products such as the TTR300,
TTR310, FRAX99, FRAX101, DELTA2000, DELTA4110,
and MLR10.
APPLICATIONS
MTO3XX Transformer Ohmmeters are used to:
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Verify factory test readings.
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Help locate the presence of defects in transformers such
as increased contact resistance in terminal connections
and tap-changers.
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Check the operation of on-load tap changers.
sunlight.
* Historically, a common accident when working in a substation happens while the technician is going up and down a ladder.
The design of the MTO3xx series of products allows testing of all six windings, on a 3-phase transformer, with one lead set connection.
Traditional “one-at-a-time” six-winding testing required 7 to 8 separate trips up/down the ladder as compared to only one trip to connect
and one trip to disconnect with the MTO3xx series.
MTO3XX Series
Six-Winding Transformer Ohmmeter
FEATURES AND BENEFITS
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Faster testing with one-time connection principle,
measures all phases and windings without disconnecting
or reconnecting leads.
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“One clamp per designated bushing” concept
significantly reduces chance of operator error in making
lead set connections.
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Automated eight-terminal/six-winding measurement
capability saves time and eliminates the need for external
jumper cables.
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Interchangeable lead set with the Megger TTR300 series
of 3-phase turns ratio instruments saves time and money.
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DC test current up to 10 A.
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Built-in discharge circuit safely discharges the specimen
when test is completed, if lead accidentally disconnects,
or if power is lost.
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Built-in demagnetization circuitry allows the operator to
de-magnetize the transformer core upon completion of
resistance testing, or as a stand-alone feature before SFRA
testing or when the transformer is put back in service.
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Custom PowerDB form for production heat-run (interval)
testing.
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PowerDB software allows for data analysis and trending
while in the field without the use of an external
computer.
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The user can easily recall transformer set ups from a
custom-settings menu with PowerDB.
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PC interface via USB for remote control operation and
downloading of test results for ease of use.
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MTO330 is equipped with onboard 8.4 inch, full-color
VGA transflective screen viewable in bright sunlight
and built-in capability for storing and downloading test
results.
Easy, Automatic Testing of All Six Windings
Once connected, the MTO3XX performs resistance
measurements on all windings without any reconnection.
The test procedure is simple and efficient. One end of
the measurement cable set is connected to each bushing/
terminal of the transformer using the special Kelvin clamp.
The other end of the cable is connected to the MTO3XX.
The instrument will automatically measure selected
resistances of both HV and LV windings. The test sequence
can be selected as 6-winding with simultaneous winding
magnetization, 3-winding measurement of HV and LV
separately, or single-winding test.
PowerDB™ ONBOARD Software
(Model MTO330 only)
The “PowerDB ONBOARD” logo means PowerDB software
is running on a computer embedded within the MTO330.
This software provides the MTO330 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” or
A4 test form can also be printed in the field via an optional
USB printer, and without the use of an external computer.
Two Instruments, One Set of Leads
MTO3XX
TTR3XX
The diagram shows the MTO3xx series and TTR300 series easily and conveniently using the same set of test leads. For example, the user can
leave the leads connected to the transformer and use the same lead set to run turns-ratio testing with the Megger TTR3xx series, eliminating
several up-and-down-the-ladder trips.
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