1.1 This test method covers the determination of the partial discharge inception voltage of insulating liquids of petroleum, ester and silicone origin. It is applicable to liquid oils commonly used in cables, transformers, oil circuit breakers and similar apparatus as an insulating and cooling medium. The suitability of this test method for testing oils having viscosities of more than 19 cSt (mm2/s) (100 SUS) at 40 C (104F) has not been determined. 1.2 This test method is more sensitive to the deterioration effects than IEC 60156, ASTM D 877 or D 1816 test methods, especially when cellulosic fibres, particles or gassing tendency are present in the oil. It has been found to be especially useful in diagnostic investigations of the partial discharge inception voltage in insulating systems.
Oil; Liquid; Breakdown
This standard is needed by equipment operators who utilize liquid filled insulation systems. This method is a more sensitive measurement of the quality of the electrical insulating properties of the liquid. It will be used by equipment maintenance engineers and asset managers to determine the quality of insulating liquids for maintenance or replacement activities.
The title and scope are in draft form and are under development within this ASTM Committee.
Developed by Subcommittee: D27.05
Staff Manager: Kelly Paul
Date Initiated: 11-06-2018
Technical Contact: Thomas Prevost