Megger OTS100AF - Key Features and Benefits; Product Applications

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Features and benefits
 Fully automatic breakdown tester with test voltages up to 100 kV/ 80 kV / 60 kV depending on model
 Advanced 400 ml oil vessel with accurate electrode gap setting and adjustment locking mechanism
 Flat electrode gap gauges that will not damage electrodes
 Easy clean test chamber with oil drain
 Magnetic bead stirrer or optional lid mounted impeller (conforming to ASTM D 1816)
 Direct trip control employing voltage and current measurement
 Rapid response to trip (<10 μs)
 Automatic oil temperature measurement
 Intuitive user interface with backlit QVGA colour display (visible outdoors)
 Simple transfer of test results via USB flash drive
 USB barcode reader scans oil sample barcode labels
 Optional VCM100D/VCM80D voltage check units measure voltage directly
Applications
The OTS100AF/80AF/60AF are used for determining the dielectric strength of high voltage insulating liquids, such as
the insulating oils used in transformers, switchgear and other electrical apparatus. The dielectric breakdown voltage
is a measure of the insulating ability of a liquid to withstand electrical stress. Contaminants such as cellulosic fibres,
conducting particles, dirt, and water reduce breakdown voltage of an insulating liquid. A low result indicates the
presence of one or more of these contaminants.
The test set is fully automatic. The operator has simply to prepare the test vessel, load it with sample oil, place it in
the test chamber, select the appropriate specification for the tests and then start the test sequence. The test set
automatically carries out the sequence of tests as defined by the pre-selected national specifications. Oil testing
specifications, for which the sets are pre-programmed, are as follows:
 ASTM D 1816-04
 ASTM D 877 A & B
 BS EN 60156
 CEI EN 60156
 IEC 60156 1995-05
 IRAM 2341-72
 JIS C2101-99 (M) & (S)
 PA SEV EN 60156
 UNE EN 60156
 NF EN 60156
 SABS EN 60156
 VDE 0370 Part 5
 AS1767.2.1
A critical factor with respect to field testing of oil is its temperature, because samples from a transformer taken shortly
after switch off can be many degrees hotter than equivalent room temperature laboratory tests performed at 20 ºC to
23 ºC. The OTS100AF/80AF/60AF instruments measure the oil temperature during the test so that temperature
correction can be applied to results.
NB: Certain standards require field tests to be performed between 20 ºC and 30 ºC.