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OTS80PB and OTS60PB OTS100AF, OTS80AF and OTS60AF
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Applications
5. Applications
The oil test set is 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 and withstand 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 and withstand 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 1816-12
ASTM D 1816-12E (Ester oil)
ASTM D 877A-19
ASTM D 877B-19
AS1767.2.1
BS EN 60156-96
BS 5730a AD 30 kV
BS 5730a AD 40 kV
BS 5730a BCEF 22 kV
BS 5730a BCEF 30 kV
BS 148 / EN 60156
CEI EN 60156-95
Custom 5, 6 and 10
GB/T 507-2002
GOST 6581-75
IEC 60156-95
IEC 60156-2018
IEC 60156-2018V
(High viscosity oils)
IEC 60156-2018 Annex A
IEC 60156-2018 Annex A (V)
(High viscosity oils)
IRAM 2341
IS 6792-2017
IS 6792-2-2017
JIS C 2101-99 (M) (Mineral)
JIS C 2101-99 (S) (Silicone)
NF EN 60156
PA SEV EN60156
SABS EN60156
UNE EN 60156
VDE0370 part 5
Withstand A
Withstand B
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.
Note: Certain standards require field tests to be performed between 20 ºC and 30 ºC.
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