Applications
5
The OTS 60PB is used for determining the dielectric strength of liquid insulants such as insulating oils used
in transformers, switchgear, cables and other electrical apparatus. It is portable and suitable for testing on
site as well as in the laboratory.
The test set is fully automatic. The operator has only 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 carries out automatically (and if necessary unattended) the sequence of tests as
defined by the pre-selected national specification.
Oil testing specifications, for which the set is pre-programmed, are as follows:–
A 5 minute test sequence is also provided so that the operator may quickly obtain an idea of the breakdown
value of an oil sample.
Two types of semi automatic withstand (proof) testing of an oil sample are available. The principle with
these tests is to subject the oil sample to a specified voltage for a defined length of time (1 minute) to see
if it will withstand that voltage. In one of the tests the voltage is removed after a minute, in the other test
the voltage continues to rise after passing for one minute until breakdown or the maximum value is
reached. Withstand (proof) tests can be set up to the user’s own requirements, and then repeatedly called
up to quickly test oil under known fixed conditions.
The test results can be reviewed on the LCD or printed via the RS232 interface. An optional, battery
operated printer is available to obtain a hard copy of the results.
The safety features incorporated in the test set’s design include two forced break switches used as
described in BS 5304. These are interlocked with the oil vessel loading door.
Power cord
If the power cord plug is not suitable for your type of socket outlets (receptacles), do not use an adaptor.
You should use a suitable alternative power cord, or if necessary change the plug by cutting the cord
and fitting a suitable plug. The colour code of the cord is:
Earth (Ground) Yellow/Green
Neutral Blue
Phase (Line) Brown
If using a fused plug, a 3 Amp fuse to BS 1362 should be fitted.
Note: A plug severed from the power cord should be destroyed, as a plug with bare conductors is
hazardous in a live socket outlet (receptacle).
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