Circutor OT-60 Instruction Manual
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Circutor OT-60 Instruction Manual

Circutor OT-60 Instruction Manual

Dielectric strength tester for isolating oils
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DIELECTRIC STRENGTH TESTER
FOR ISOLATING OILS
OT-60
( Código: P60311 )
INSTRUCTION MANUAL
( M98112801-03 / 04B )
(c)
CIRCUTOR S.A.

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Summary of Contents for Circutor OT-60

  • Page 1 DIELECTRIC STRENGTH TESTER FOR ISOLATING OILS OT-60 ( Código: P60311 ) INSTRUCTION MANUAL ( M98112801-03 / 04B ) CIRCUTOR S.A.

  • Page 2: Basic Instructions

    This manual is issued to help all the users to install and use the dielectric strength tester for isolating oils OT-60, and also to help them to get the best from it. After receiving the equipment, please check the following points:...
  • Page 3 The delivered gauge is 2,5 mm ± 0,05 mm in width, according to the IEC-156 standard . If you need other widths go to 10 point. 2.3 OT-60 equipment: Once extracted the test cell, we will see the following image: Sometimes we can find the keys inside the bag specified on point 2.2 2.4 Connection cable:...
  • Page 4 (water, solid materials in suspension), allowing us to decide on the possibility of carrying out a treatment of drying and filtration, or replacing the oil. The method that the OT-60 uses can be applied to oils of nominal viscosity of up to 350 mm /s at 40ºC, according to IEC-156 standard.

  • Page 5: Description Of The Controls

    4. DESCRIPTION OF THE CONTROLS Next we can see a representation of the controls of the equipment and the description of its functions: PAUSE STOP...
  • Page 6 1- DISPLAY "--,-" usually appears, indicating that the equipment is awaiting a command. When the voltage begins to increase, it is shown on the DISPLAY. The value that we can see corresponds to the DISRUPTIVE VOLTAGE of the oil, and its unity is the kV. When an arch appears, the DISPLAY shows the disruptive voltage of the oil until "STOP"...

  • Page 7: Starting The Equipment

    5. STARTING THE EQUIPMENT. 5.1- Transport: Transport the equipment to the zone where the tests will be done, using for it the lateral handles: Remarks: If it is decided to transport the equipment outside the enclosure of habitual use, is very important that the option of FRAGILE TRANSPORT is used. 5.2- Earth connection Connect the earthing screw on the rear panel to the general earth of the installation.
  • Page 8 5.4- Test cell extraction If still it has not been done, open the door of the equipment and pull out the test cell from the chamber. In order to extract the test cell, pull out both of white supports simultaneously and firmly, one with each hand.

  • Page 9: Preparation Of The Sample

    6. PREPARATION OF THE SAMPLE 6.1- Collection of the sample It is very important to obtain results that adjust to the reality that you strictly carry out the measures as it is mentioned next, otherwise, the obtained results could be erroneous. According to the IEC-156 standard it will be necessary to adopt the following indications.

  • Page 10: Test Method

    7. TEST METHOD The test method consists of submitting the oil to an electric field from a continuously increasing AC current until the oil is perforated because its dielectric properties are surpassed (insulation properties). When this occurs, on the display is shown the disruptive voltage in kV. If we wanted to obtain the dielectric strength of the oil (kV/cm), we would have to divide the value shown on the display (kV) by the distance between electrodes (cm).
  • Page 11 It is possible to modify the rotation speed of the stirrer. To do this, open the door of the equipment and turn the selector (12) by means of a screwdriver or a similar object, as we can see next: 7.3- Closing the door Close the door, since if it is not closed, the protection circuit will prevent the operation of the equipment.
  • Page 12 7.5- Selecting the test type Arrived this moment we must select: a) The type of ramp we desire between the four possible ones, depending on the standard we follow or depending on the indications of the oil manufacturer: 5kV/s, 3kV/s, 2kV/s o 0.5kV/s. 2 kV/s is selected according to IEC-156 standard.
  • Page 13 7.6- Doing the test Once we have selected the parameters explained before, we will press “START” and the equipment will start to do the complete cycle: a) If the stirring function is selected, the oil sample will be stirred for 60 seconds. After this time the "STIRRER"...

  • Page 14: Maintenance

    7.7- Repeating the test The cycle previously described will be carried out six times with the same sample of oil. Between the cycles it will be necessary to wait to the disappearance of the gas bubbles that have possibly been produced, either waiting for 5 minutes, or selecting the stirring function. 7.8- Stopping the equipment When the equipment is not used, turn the key to the stop position (“O”).

  • Page 15: Environment Considerations

    After polishing, clean with petroleum ether (reactive for analysis, rank of boiling 60ºC to 80ºC), followed of acetone (reactive for analysis). Mount the electrodes in the cell, fill it with clean and new oil, of the same type than the one that is going to test later, and elevate the voltage until rupture 24 times.

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