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OTS80PB and OTS60PB OTS100AF, OTS80AF and OTS60AF
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General description
3. General description
Megger’s Oil Test Sets are liquid dielectric breakdown and
withstand testers.
The OTS80PB, OTS60PB models are portable instruments,
designed for use in the field, where as the OTS100AF,
OTS80AF and OTS60AF are designed for laboratory use.
They are fully automatic, powered by battery (model
dependent) or mains and facilitate accurate breakdown
voltage tests and withstand voltage tests on mineral, ester
and silicon insulating oils. The precision test vessel sets the
accuracy standard for the liquid insulation test industry.
For ease of use the instrument comes pre-programmed
with a ‘library’ of international breakdown and withstand
test standards and the ability to create custom tests.
The instrument is housed in a metal case with moulded
end caps that accommodate convenient carry handles.
The test chamber is designed with an easy-clean surface and provides a drain for spilt oil through an internal pipe
routed to the rear of the instrument. A beaker or similar can be used for spillage collection. The test area is covered
by a plastic lid with an electrically protective inner conductive layer which, with the metal case, provides a safe
equipotential enclosure for high voltage testing.
The lid allows in plenty of ambient light and users are able to view the test and witness stirring and the breakdown.
The chamber lid is dual redundant safety protected with micro-switches to prevent accidental electrification.
The advanced test vessel design yields highly accurate and repeatable results. Two stirring options are available; an
internal magnetic bean stirrer which is dropped into the oil and lid mounted impeller that conforms to the oil test
standards. Stirring during breakdown and withstand testing is employed to produce an homogeneous distribution of
contaminants within the oil and to free any carbon generated between electrodes during testing.
Electrode gap is set by precision adjustment wheels that lock in position ensuring that the electrodes do not move
during a busy day in the field. It is, however, advisable to check the electrode condition and gap daily because it
is a critical parameter in breakdown voltage testing. Flat anodised Aluminium gap setting gauges are supplied in
popular sizes to facilitate electrode gap setting. Electrodes are detachable and are available in shapes that meet all
international standards, i.e. disk, spherical and mushroom (VDE) electrodes.
A selection of international breakdown and withstand tests are chosen from a library of standard sequences
and started from the user friendly menu on the LCD display. The top level test screen displays all pertinent test
information to ensure the correct electrodes are used with the specified electrode gap setting.
Results are viewed on screen and printed on the internal printer following a test result. In the event of a breakdown
not occurring before reaching the maximum voltage, the instrument will return maximum voltage. This is a safety
measure to ensure the instrument is not driven over its designed maximum voltage.
Safety features incorporated in the design include dual safety micro-switches and zero volt touch bar, the screened
chamber lid and convenient power supply On/Off switch. Pressing any button during a test will immediately remove
the high voltage and terminate the test. It is important to earth this instrument using the ground connection at the
rear of the instrument to ensure safe operation.
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