Transformer Oil Tan Delta and Resistivity Tester

Cleaning the Test Cell

Proper cleaning of the oil cup before measurement is crucial due to the high sensitivity of insulating oil to contamination. Follow one of the methods below:

      Method 1:

1. Disassemble the oil cup electrodes.
2. Wash with neutral soap or detergent, avoiding any abrasive actions that could damage the electrode surface.
3. Rinse the electrodes multiple times with clean water.
4. Soak the parts in anhydrous alcohol.
5. After cleaning, dry the electrode surfaces with silk fabrics and store in a clean container.
6. Place the parts in an oven at around 100°C to dry.

      Method 2:

1. Disassemble the oil cup.
2. Clean all parts thoroughly with chemically pure petroleum ether and benzene.
3. Rinse with acetone and neutral detergent.
4. Boil the parts in a 5% sodium phosphate distilled water solution for 5 minutes, then rinse with distilled water.
5. Dry the parts in an oven at 105 to 110°C for 60 to 90 minutes.
6. Reassemble the parts when they cool to room temperature.

      Method 3: Ultrasonic Cleaning:

1. Disassemble the oil cup.
2. Clean all parts with solvent.
3. Place all parts in soapy water and oscillate for 20 minutes using an ultrasonic cleaner.
4. Rinse with tap water followed by distilled water, and then oscillate with distilled water for another 20 minutes.

      Method 4: Solvent Cleaning:

1. Disassemble the oil cup.
2. Rinse all parts with solvent, replacing the solvent as needed.
3. First wash with acetone, followed by tap water, and then with distilled water.
4. Dry the parts in an oven at 105 to 110°C for 60 to 90 minutes.

When testing a series of similar liquid samples, the same test cell may be used without intermediate cleaning, provided the previous sample tested had a performance better than the specified measuring value. If a tested sample’s performance is inferior, the test cell must be cleaned before conducting the next test.