What is the lab manual procedure for testing the dielectric strength of transformer oil?

To test the dielectric strength of transformer oil, you typically follow a lab manual procedure that includes the use of a tester specifically designed for this purpose, such as those offered by Globecore. First, prepare the sample of transformer oil, ensuring it is free from contaminants and has been properly stored. Next, fill the testing cell of the dielectric strength tester with the oil sample, ensuring it reaches the designated level as per the manufacturer’s guidelines. You will then set the voltage ramp rate on the tester, which is usually specified in the manual, often around 2-5 kV/s, to gradually increase the voltage until the breakdown occurs. The tester will monitor and record the voltage applied, and upon breakdown, display the dielectric strength of the oil in kV/cm. It’s crucial to follow safety protocols during the procedure, ensuring the testing environment is secure and that all personnel are aware of high voltage risks. Finally, document the results, as these will reflect the dielectric strength of transformer oil in kV/cm, and compare them with industry standards to assess the quality of the oil.