ASTM D – Standard Test Method for Dielectric Breakdown Voltage of Insulating Oils of Petroleum Origin. Using VDE Electrodes. ▫ IEC Insulating. Page 1. Page 2. Page 3. Page 4. Find the most up-to-date version of ASTM D at Engineering
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Non-disruptive discharges in the test circuit should not reduce the test voltage to such an extent, and for such a time, that the disruptive discharge breakdown voltage of the test specimen is significantly affected.
This test method is applicable to insulating liquids commonly used in cables, transformers, oil circuit breakers, and similar apparatus as an insulating and cooling medium. Automatic equipment should be used to control the voltage rate of rise because of the difficulty of maintaining a uniform voltage rise manually. Particular reference should be made to the general precaution statement of this test method. USB memory stick Operating Temperature: The most important requirement of an insulating oil is a high dielectric strength.
Conduct a voltage breakdown test on a specimen of this oil in the manner specified in this test method. The residue from the buffing should be removed by repeated wiping with lint-free tissue paper saturated with a suitable solvent, followed by solvent rinsing or ultrasonic cleaning. The voltage in the test circuit should be stable enough to be awtm by varying current flowing in the capacitive and resistive paths of the test circuit.
Request a Free Quote Right Now. Alternatively, the cell may be stored empty in a dust-free cabinet. ASTM Method being used? If it is necessary to readjust the electrodes, lock the electrodes and check the spacing.
The test cell shall be designed to permit easy removal of the electrodes for cleaning and polishing, verification that the shape is within the specified tolerance, and to permit easy adjustment of the gap spacing.
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Do not use a low boiling point solvent, as its rapid evaporation may cool the cell, causing moisture condensation. Tightly seal and shield asgm light until ready to be tested.
When not in use, keep the cell filled with oil that meets the requirements of Specification D of the type normally tested. A lower than anticipated value is considered as evidence of cell contamination; then repeat the cleaning and the breakdown test with clean dry oil. A test cell having a capacity of 0. Asfm and label automatic controls in terms of rate-of-rise.
Refer to Terminology D for definitions used in this test method. Oil sampling procedures are detailed in Practice D Mount the electrodes rigidly from opposite sides with the spacing aztm centered within more or less 1 mm.
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The sample shall be taken in a dry, clean, non-permeable bottle. Link to Active This link will always route to the current Active version of the standard. If this occurs, before using, warm the cell to evaporate the moisture.
What are your requirements. After adjustment of the spacing, rinse the cell with a dry hydrocarbon solvent, such as kerosine or solvents of Specification D It has been found to be especially useful in diagnostic and laboratory investigations of the dielectric breakdown strength of insulating liquid in insulating systems.
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Provide the test cell with a motor-driven two-bladed impeller and drive shaft, constructed of a material having aastm dielectric strength.
Pharmaceutical laboratory apparatus stability chambers, tablet disintegration, tablet dissolution, tablet hardness, V-blenders, This test method should be used as recommended by professional organization standards such as IEEE C Clearance from the electrodes to all sides, bottom, cover or baffle, and r1816 part of the stirring device is at least Work Item s – proposed revisions of this standard. Petroleum Products and Biofuel lab apparatus baths, calorimeters, color measurement, density meters, flash point, hydrogenators, oil testing, penetrometers, surface tension, vapor pressure, viscometers and rheometers, Determination of the dielectric breakdown voltage of insulating oils provides an early detection method for any reduction in the insulating properties.
If the test of any sample is below the breakdown value being used by the operator as a minimum satisfactory value, drain the cell and flush the cell with new oil of the type to be tested that axtm filtered through a 5-micron filter and containing less than 25 ppm moisture before testing the next specimen. The impeller, located below the lower edge of the electrodes, rotates in such a direction that the resulting liquid flow is directed downward against the bottom of the test cell.
Adjustment and Care of Electrodes and Test Cell 7. Flat “go” and “no-go” gages may be substituted having thicknesses of the specified value more or less 0. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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