Your mail: Our mail: sales dgaequipment. Validate: Change Image. Electrical Apparatus 4. Calibration s shall be traceable to national standards and calibration should be verified annually or more often to ensure accuracy requirements.
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Myers, Inc. The D method uses electrodes specified to conform to the design of a VDE standard, Specification The third standard method is IEC Standard , Insulating liquids—Determination of the breakdown voltage at power frequency— Test method. Standard , published by the nonprofit, non-governmental international standards organization, the International Electrotechnical Commission IEC , uses electrodes that are similar geometrically to the VDE electrodes. In all three test methods, the electrodes are mounted in a test cell filled with insulating liquid to ensure that the electrodes are completely covered.
The test cell is then installed in a dielectric breakdown voltage apparatus so that the electrodes can be charged with an appropriate alternating current AC voltage. The AC voltage is increased until breakdown occurs, signified by the operation of automatic circuit interruption equipment included in the dielectric voltage breakdown apparatus.
The methods vary with regard to the geometry of the electrodes themselves, as noted above, and the gap spacing of the electrodes and rate of rise for the applied AC voltage. A D test cell will be equipped with a two bladed impeller and shaft to provide agitation of the test specimen. A test cell may also be equipped with a similar impeller, but it is optional for this method. ASTM D is an older method.
The electrodes resemble flat coins, and are spaced 0. The rate of AC voltage rise across the electrodes during the determination of dielectric breakdown voltage by the D method is 3, volts-per-second. Electrodes for the D and IEC methods are similar to each other, resembling mushroom caps, each being a segment of a 25 mm millimeter radius-sphere with the edges rounded to a radius of four millimeters. In the D method, there are two gaps settings that may be used, either one millimeter 0.
For a D determination, the rate of rise for the AC voltage is volts-per-second. For a dielectric breakdown voltage using the IEC method from standard , the spherical electrodes are spaced 2.
Dielectric breakdown voltage determinations identify the presence of contaminants in the oil. These include contamination by moisture, particles and oil aging and oxidation by-products.
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Active view current version of standard. Other Historical Standards. Work Item s - proposed revisions of this standard. More D 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. Refer to Terminology D for definitions used in this test method.
Dielectric Voltage Testing - Standard Methods
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