Transformer Oil BDV Test Kit with IEC standard. The presence of moisture in a transformer is very harmful. The test cells are made of glass material, which has been shown to have the best chemical characteristics for testing insulating liquids. Online Coalescing and Vacuum Turbine Oil Purifier. The cup top is covered with a clean glass plate. This is due to the larger gap separation and the higher voltage rate of rise. This page requires a Premium Membership. In some transformers, that meets the minimum operating … Operation of all alarm, control, and trip circuits shall be verified from temperature and level indicators, pressure relief device, and fault pressure relay, if applicable. Position the oil processing and filling unit at the cleared area besides the ransformer. System time can go on running under power off; (The system time just for reference can not be the standard of timing). The oil in the test cell shall be at least 40 mm above the electrodes and it should be allowed to stand for 20 minutes before performing the test to let air bubble escape. The processes should be continued until the oil can withstand 30 KV for seven consecutive tests performed 4 hours apart. BDV test means Breakdown Voltage Test. The following tests we recommended for a complete analysis of a transformer’s oil: Dielectric breakdown (ASTM… PREMIUM Membership Required. The ASTM D1816 has a built-in motor on the lid to drive the impeller. Terms of Use Ventilate the gas space with dry air to purge it of the nitrogen gas that it contains. Transformer should not be left under vacuum except during the vacuum filling operation. The testing data can keep 100 years under the condition of power off. Stirring is constant during the test, even during the intervals between breakdown measurements, with a two-bladed impeller having a defined pitch and operating speed between 200 and 300 rpm. This test does not measure the water content in the transformer paper insulation. We gather a group of specialized talents with years of working experience and technological development. Therefore, when wanting to use this standard, the DTA 100 C would be recommended because it can apply a voltage up to 100 kV. Procedure A: 5 breakdown measurements are made in one test cell filling with a 1-minute interval between the breakdowns. The pressure-vacuum gauge indicates the tank gas space pressure relative to atmospheric pressure. | Suppliers Therefore, the oil should be taken from the bottom of drums with the help of a glass tube or ‘oil thief oil sampler’ sufficiently long to reach the bottom. We provide you with fast analyses to IEC, ASTM, and ISO standards, helping you identify issues quickly. When supplied, the hood must be vented to the outdoors. | - User Information Legal Enquiry Guide, © 1999-2020 Alibaba.com. The device consists of a self-resetting, spring loaded diaphragm and a mechanical operation indicator (Semaphore). Home / Technical Articles / What Standards To Use For Transformer Oil Testing? Oil Processing and Filling Procedure by Approved 3rd Party. This test shows the dielectric strength of Transformer oil. In this article check out some important keywords: transformer oil, transformer oil testing, oil used in transformer, bdv of transformer oil. Transformer Oil BDV Test Kit with IEC standard adopts industrial SCM to control which is applied to integrate circuit, new model I/0 connection , particular testing and anti-jamming technology which is largely improved the machine's capacity . This test is performed in the oil testing set. The oil should be drawn from near the bottom and delivered back into the transformer tank at the top. Home / Technical Articles / What Standards To Use For Transformer Oil Testing? maintain insulating properties of the material such as paper, winding, etc. Therefore, D1816 test results furnish a better evaluation of changes that may occur in the oil from transformers.". When nitrogen is called for, the nitrogen used should have a dew point not higher than -50°C (-58°F) and total impurities not exceeding 0.1 % by volume. The following tests we recommended for a complete analysis of a transformer’s oil: Dielectric breakdown (ASTM… PREMIUM Membership Required. 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Your email address will not be published. thick, sharp edges with no more than 0.254 mm (0.01 in.) The level should coincide with the equation of oil level against temperature mark in the oil temperature gauge. BDV or Break Down Voltage is the Dielectric strength of Transformer Oil. Dry air shall be blown into the transformer so as to create a flow of air through the cover opening. Different international standards have been created to provide recommended practices when determining the dielectric breakdown voltage of insulating liquids. The pressure relief device will withstand full vacuum and need not be removed from the transformer tank during any vacuum. It decreases the dielectric strength of oil and other insulating material such as winding insulation, paper, etc. Insulating transformer oil shall be tested for -Dielectric breakdown voltage, Water content, Acid neutralization number, Specific gravity, lnterfacial tension, Visual condition, Color, Power factor tests. This is also used for silicone liquids or to establish the breakdown value of a liquid where an ASTM specification does not exist (new liquids, R&D, etc.). The cup is then filled with sample oil to be tested. This standard also asks for 5 sequential measurements to be conducted with the mean being the breakdown voltage value. BDV Test is an very important testing procedure for the insulation oils in transformer. Discard the oil if acidity is above 1.0 mg. KOH/gram. The “dielectric breakdown test” is calculated as an average of five breakthroughs achieved in a standard discharger with two electrodes submersed in the oil at 2.5 mm distance from each other. - In fact, when comparing D877 to D1816 Section 5.2.1 in IEEE C57.106 states: "The electrodes in D877 are thin flat disks, which are not representative of the electrodes in transformers. Onetouch 2 kV/s. Please be cautious and check with your supplier if this product is for virus protection purposes and if the coronavirus (COVID-19) will affect your order. Therefore, D1816 test results furnish a better evaluation of changes that may occur in the oil from transformers." The recommended size of the glass test cell is 55 x 90 x 100 mm. The dew point in the transformer should never be higher than 20°F. | Careful recording of the oil of test samples and their comparison will help in anticipation of the impending trouble and adoption of the remedial measures. A low breakdown voltage value can be a clear indication of contamination within the liquid from the degradation processes that occur during the lifetime of a transformer. This value is noted down which must be 30 KV (RMS) for 4mm gap and 20 KV (RMS) for 2.5 mm gap. Flushing and vacuum of transformer tank shall be performed as per manufacturer’s recommendations. Privacy Policy Required fields are marked *. However, the D1816 electrodes are more responsive to particles and dissolved water in oil, both of which are detrimental to the electrical strength of oil in transformers. Transformer oil is crucial in the cooling process of a transformer. Therefore, the dielectric strength of the oil at the bottom may be lower.
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