CIRCUTOR OT2-60D - Manual (Page 9)

DIELECTRIC STRENGTH TESTER FOR ISOLATING OILS OT2-60D --------- Page 9
5.2. Preparation of the sample to test
According to the IEC-156 standard it will be necessary to adopt the following
indications.
The test will be done, if another thing is not specified, with the sample as it’s
received, without drying or extracting the gas.
The operations of sample preparation will we done in a dry and free of dust
place.
At the moment of the test, the temperature of the test liquid and the room
temperature will not differ more than 5ºC and for the arbitration tests the
temperature of the oil will be between 20ºC ± 5ºC.
The container that contains the oil sample to test must be shacked softly and
turned upside down several times to assure the most homogenous
distribution of the impurities contained in the oil, trying to avoid the formation
of air bubbles. Avoid the unnecessary exposing of the sample to the air of the
atmosphere.
Immediately before its use the cell will be cleaned according to 8
th
point.
The oil is now spilled slowly in the test cell, avoiding the formation of air
bubbles.
The temperature of the liquid is measured and written down.
It is very important for the correct development of the test that the electrodes
are totally covered by the oil, so that the distance from the surface of the oil to
the axis of the electrodes is not less than 40 mm.
6. SETTING UP THE EQUIPMENT
The setup of this equipment has been minimized by careful consideration of the
operator during design. The OT2-60D one-piece construction permits convenient
portability. The OT2-60D test set requires that the unit be operated with the control
panel in the horizontal position to keep oil over the high voltage transformer in the high
voltage tank.
6.1. Select a location for the unit that will allow easy viewing of the kilovolt meter.
Using for it the lateral handles.