Atec Megger-MTO3XX Series - Manual (Page 2)

MTO3XX Series
Six-Winding Transformer Ohmmeter
FEATURES AND BENEFITS
n
Faster testing with one-time connection principle,
measures all phases and windings without disconnecting
or reconnecting leads.
n
“One clamp per designated bushing” concept
significantly reduces chance of operator error in making
lead set connections.
n
Automated eight-terminal/six-winding measurement
capability saves time and eliminates the need for external
jumper cables.
n
Interchangeable lead set with the Megger TTR300 series
of 3-phase turns ratio instruments saves time and money.
n DC test current up to 10 A.
n Built-in discharge circuit safely discharges the specimen
when test is completed, if lead accidentally disconnects,
or if power is lost.
n
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.
n
Custom PowerDB form for production heat-run (interval)
testing.
n
PowerDB software allows for data analysis and trending
while in the field without the use of an external
computer.
n
The user can easily recall transformer set ups from a
custom-settings menu with PowerDB.
n
PC interface via USB for remote control operation and
downloading of test results for ease of use.
n
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.