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Description
The Megger range of automatic
oil testers offer fully automatic testing with many advanced
features. The design allows the operator to simply prepare an
oil test vessel, load it with the sample oil, place it in the
chamber and initiate the test sequence. The test set then
carries out, the series of tests as specified in a large
number of oil testing specifications. These define the
sequence of tests including the stand and stir times, rate of
voltage rise and number of tests resulting in a calculation of
the average value of the oil breakdown strength. Withstand or
proof testing can also be selected. This test subjects the oil
to a pre-selected voltage for 1 minute to check for a
breakdown.
The OTS60PB is a
fully automatic, battery powered, portable oil test set. The
test voltage is electronically controlled to the maximum of 60
kV. Designed for on site testing, the instrument is supplied
in a rugged carrying case with a handle for ease of
transportation. An internal rechargeable battery gives a large
number of tests before recharging. A clear display shows a
menu of test options and guides the operator through the set
up programme, illustrates the correct test electrodes and gap
to use, shows the progress of each test and gives the results
of the test sequence. The result can be set to give either a
numerical average (with standard deviation where specified) or
a pass/fail message. The display can be set to read in
English, French, German, Italian, Spanish and Portuguese. An
optional printer kit enables hard copies of results to be
produced. Accessories, such as the battery charger, spare
vessels, spare electrodes and a spacing gauge are located in
an attached compartment. Stirring is carried out by a motor
driven paddle stirrer.
The OTSAF/2 range are
laboratory instruments with many advanced features. Three
versions are available with maximum test voltages of 60 kV, 80
kV and 100 kV. They offer fully automatic operation plus the
benefit of a built in printer to produce a hard copy of the
test results and the ability to program up to five user
defined tests for individual applications. The withstand test
can be set to operate at any test voltage and with an initial
stand time. The dot matrix liquid crystal display can also be
set to read in one of six languages. An oil test vessel,
configured to suit the IEC156 test specification, is supplied
with the instrument.
A large, backlit,
liquid crystal display shows test menus, set up screens and
results. The resolution of the high voltage output is
displayed to 0,1 kV. Results can be printed on the internal
dot matrix printer or transferred via the RS232 interface to
an external printer or PC. Printouts are automatically time
and date stamped.
Standard stirring
with the OTSAF/2 is achieved by a magnetic stirrer bar.
Additional vessels are available optionally, including one
suitable for testing to the ASTM D1816 specification. This
calls for stirring to be carried out by a motor driven
impeller. Each test can be selected with either magnetic
stirring, propeller stirring or no stirring. The VCM100 is a
calibration meter suitable for verifying the calibration of
oil test sets. The meter will enable the high voltage output
to be checked, traceable to national standards, and is
suitable for all recent laboratory models of Megger oil
dielectric strength test sets such as the OTSAF series and the
OTS auto and semi automatic series.
The calibration meter
fits in the oil test set chamber in place of a standard
vessel. The design ensures that the
load to the transformer is similar to the load during an oil
dielectric strength test. The voltage indication is viewed on
an analogue display marked from 0 to 100 kV with 2 kV
divisions. The scale also shows pass tolerance bands to enable
a quick assessment of the accuracy to be made.
The meter is supplied
in a protective bag. Oil test sets will display the individual
breakdown voltage and their average value. The VCM100 allows
the actual applied voltage to be quickly and easily checked
against the displayed value giving immediate confidence in the
calibration of the oil test set. |
