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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Particular reference should be made to the general precaution statement of this test method. Adjustment and Care of Electrodes and Test Cell 7. The equipment should produce a straight-line voltage-time curve over the operating range asttm the equipment.
Up to 75kV rms symmetrical Voltage measurement accuracy: What are your requirements. It has been found to be especially useful in diagnostic and laboratory investigations of the dielectric breakdown strength of insulating liquid in insulating systems.
Determination of the dielectric breakdown voltage of insulating d1186 provides an early detection method for any reduction in the insulating properties. At the beginning of each days testing, clean according to 7. Alternatively, the cell may be stored empty in a dust-free cabinet. A cell having a capacity of 0. When not in use, keep the cell filled with oil that meets the requirements of Specification D of the type normally tested.
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Conduct a voltage breakdown test on a specimen of this oil in the manner specified in this test method. Refer to Terminology D for definitions used in this test method. This test method should be used as recommended by professional organization standards such as IEEE C Measurement of oil temperature: Do not use a low boiling point solvent, as its rapid evaporation may cool the cell, causing moisture condensation.
If it is necessary to readjust the electrodes, lock the electrodes and check the spacing. It is recommended that the circuit design limit the disruptive current duration and magnitude to low values that will minimize damage to the electrodes and limit formation of non-soluble materials resulting from the breakdown, but consistent with the requirements of 4.
Plastic bottles are permeable and moisture content of the sample may change resulting in a measurable difference when compared to samples collected in non-permeable containers. 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.
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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.
So that the breakdown may be observed, transparent materials are desirable, but not essential. Clearance from the electrodes to all sides, bottom, cover or baffle, and any part of the stirring device is at least Right-click to open the PDF in a new astmm or download it: General Use laboratory apparatus balances, baths, blenders, centrifuges, chart recorders, freezers, fume hoods, furnaces, glassware washers, glove boxes, mixers, moisture testing, ovens, pumps, shakers, vacuum equipment, water adtm If a dielectric breakdown does not occur during any of the consecutive breakdown tests using the 2 mm spacing or the sample is not adequate for the 2 mm spacing test cell a 1 more or less 0.
Oil sampling procedures are detailed in Practice D 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 is s1816 through a 5-micron filter and containing less than 25 d18816 moisture before testing the next specimen.
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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, A lower than anticipated value is considered as evidence of cell contamination; then repeat the cleaning and the breakdown test with clean dry oil. Pharmaceutical laboratory apparatus stability chambers, tablet disintegration, tablet dissolution, tablet hardness, V-blenders, It is important to avoid touching the electrodes or the cleaned gage with the fingers or with portions of the tissue paper or chamois that have been in contact with awtm hands.
In order to preclude stirring air with r1816 sample, provide the cell with a cover or baffle that will effectively prevent air from contacting the circulating liquid.
IEEE Standard 4 is required during the manufacturing of the test apparatus and utilized during calibration of the equipment. Request d186 Free Quote Right Now. If this occurs, before using, warm the cell to evaporate the moisture.
Construct the test cell of a material of high dielectric strength, that is not soluble in or attacked by any of the cleaning or test liquids used, and is nonabsorbent to moisture and the cleaning and test liquids.
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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. Flat “go” and “no-go” gages may be substituted having thicknesses of the specified value more or less 0.
For referee tests or tests that will be used for close comparisons, the laboratories shall agree in advance on the spacing for the tests and ensure that all other requirements of this test method are met. Reinstall the electrodes in the test cup and adjust spacing and clean in accordance with 7.
Historical Version s – view previous versions of standard. Link to Active This link will always route to the current Active version of the standard. Contact with us now Your mail: Product Description The majority of high-voltage transformers, cables, switchgears, transducers, capacitors, and rectifiers use insulating oils for insulating electrically live parts and to carry off thermal energy.
However, a high dielectric breakdown voltage does not necessarily indicate the absence of all contaminants; it may merely indicate that the concentrations of contaminants that are present in the liquid between the electrodes are not large enough to deleteriously affect the average breakdown voltage of the liquid when tested by this test method see Appendix X1.
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After careful inspection, any electrodes from which pitting cannot be removed by light buffing should be discarded, as more refinishing would destroy the electrode contour and dimensions shown in Fig.
The dielectric breakdown voltage serves to indicate the presence of contaminating agents such as water, dirt, cellulosic fibers, or conducting particles in the liquid, one or more of which may be present in significant concentrations when d18116 breakdown voltages are obtained.