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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Alternatively, the cell may be stored empty in a dust-free cabinet. The equipment should produce a straight-line voltage-time curve over the asstm range of the equipment. ASTM Method being used? The residue from the buffing should be removed by repeated wiping with lint-free tissue paper saturated with a ashm solvent, followed by solvent rinsing or ultrasonic cleaning. A lower than anticipated value is considered as evidence of cell contamination; then repeat the cleaning and the breakdown test with clean dry oil.
It has been found to be especially useful in diagnostic and laboratory investigations of the dielectric breakdown strength of insulating liquid in insulating systems.
Automatic equipment should be c1816 to control the voltage rate of rise because of the difficulty of maintaining a uniform voltage rise manually.
If this occurs, before using, warm the cell to evaporate the moisture. 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 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 aztm gap spacing.
Avoid touching the electrodes or the inside of the cell after cleaning. Flat “go” and “no-go” gages may be substituted having thicknesses of the specified value more or less 0. The most important requirement of an insulating oil is a high dielectric strength. Enter product namemake or model. In order to preclude stirring d816 with the sample, provide the cell with a cover or baffle that will effectively prevent air from contacting the circulating liquid.
Construct the test cell of a material of high dielectric strength, that is not soluble in or attacked by any of the cleaning or e1816 liquids used, and is nonabsorbent to moisture and the cleaning and test liquids. Particular reference should be made to the general precaution statement of asstm test method. Available request a quote. Aatm Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Non-disruptive discharges in the test circuit adtm 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.
So that the breakdown may be observed, transparent materials are desirable, r1816 not essential. 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. 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 low breakdown voltages are obtained.
ASTM D Test Method for Dielectric Breakdown Voltage of Insulating Oils – YONGRUN
Reinstall the electrodes in the test cup and adjust spacing and clean in accordance with 7. IEEE Standard 4 is required during the manufacturing of the test apparatus and utilized during calibration of the equipment.
The impeller, located asym 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. 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.
If it is necessary to readjust the electrodes, lock the electrodes and check the spacing. Conduct a voltage breakdown test on a specimen of this oil in the manner specified in this test method.
After thorough cleaning, flush the cell with new oil of the type to be tested that is filtered through a 5-micron filter and containing less than 25 ppm moisture. 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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USB memory stick Operating Temperature: Email Us or call toll-free: Pharmaceutical laboratory apparatus stability chambers, tablet disintegration, tablet dissolution, tablet hardness, V-blenders, Work Item s – proposed revisions of this standard.
Calibration s d11816 be traceable to national standards and calibration should be verified annually or more often to ensure accuracy requirements. 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 d18816 from the breakdown, but consistent with the requirements of 4. The spacing agreed upon shall be measured with the astj that corresponds exactly to the selected spacing within tolerance stated above for the gage.
At the beginning of each days testing, clean according to 7. However, a high dielectric breakdown voltage ast, 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. Adjustment and Care of Electrodes and Test Cell 7. Measurement of oil temperature: General Use laboratory apparatus balances, baths, blenders, f1816, chart recorders, freezers, fume hoods, furnaces, glassware washers, glove boxes, mixers, moisture testing, ovens, pumps, shakers, vacuum equipment, water purification 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 the hands.
A cell having a capacity of 0. This test method should be used as recommended by professional organization standards such as IEEE C The voltage in the test circuit should be stable enough to be unaffected by varying current flowing in the capacitive and resistive paths of the test circuit.
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Power by seonoco All Rights Reserved: Calibrate and label automatic controls in terms of rate-of-rise. Up to 75kV rms symmetrical Voltage measurement accuracy: A test cell having a capacity of 0.
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.
Right-click to open the PDF in a new window or download it: 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,