The acidity test measures the content of acids formed by oxidation and contaminates. Transformer oil testing is one of the important parts of a power transformer. Testing Service for Monitoring the Condition of Transformer Oils. Your email address has been successfully added. 1. So let’s go. Make sure that two electrodes stay 100% below from the oil top level. Because all impurity and dusty oil always stay at the bottom level. Acidity below at 0.5 mg KOH/gm is permissible if the oil is satisfactory. Transformer Oil Testing is a proven loss prevention technique which should be a part of any condition-based predictive maintenance program. 3. 4. This acid is responsible for corrosive in nature and damages the winding core, main body tanks, and other components. You have to remember one thing; the testing voltage of the transformer oil tester should be increased gradually. 3. Learn More. First of all, you have to collect the oil sample from an active transformer. It is also responsible for sludge formation. Transformer Oil Testing is a proven loss prevention technique which should be a part of any condition based predictive maintenance program. Transformer oil testing is one of the important parts of a power transformer. You have to remember one thing; the testing voltage of the. How to Start and Stop MWM TCG 2020 V 16K Gas Engine Generator? Its use to call transformer oil and it a little bit pricey. Make sure that two electrodes stay 100% below from the oil top level. Usually, acids are formed when the transformer oil is operational. You can quickly and accurately identify the condition of your oil’s relative density, dielectric breakdown voltage, dissolved gas content, oxidation inhibitor levels and more. You will know when you need to perform this oil test because the manufacturer of the transformer will provide you the operation hour and after reaching the provided operation hour you have to run this experiment. Acidity between 0.5 to 1.00 mg keeps the oil under observation. Please try again later. 1. Acidity between 0.5 to 1.00 mg keeps the oil under observation. New oil should have a minimum dielectric strength of 35 kV by ASTM methods of testing. SDMyers has the largest transformer oil testing lab in the world, with packages that test for every known fault condition. Related: Power Transformer Troubleshooting. Oil is visually examined by passing a beam of light through it to determine transparency and identify foreign matters. Sharpen your skills with our collection of quizzes on electrical safety, maintenance & testing of electrical equipment and industry standards. An internal fault in a transformer can be discovered earliest using this test. 2. 4. This formation is rapid at temperature is above 750c. Now collect the dark brown cloudy color of oil from the bottom level drain and this oil indicate the detraction of the oil condition. Indicates the lowest temperature at which the insulating oil will flow. Over time oil degrades and Transformer Oils are no exception and are especially sensitive to this. Higher values are indicative of a problem. If the oil condition is good then it should withstand 45 kV for one minute in a standard oil testing cup with a 4 mm gap between electrodes. There was an error trying to add your email address to the mailing list. Detects the concentration level of polychlorinated biphenyls in transformer oil by gas chromatography. A high specific gravity indicates the oil's ability to suspend water. Over the past five decades we have generated millions of test results from thousands of high-voltage units, and we process samples from transformer owners across the country. Thank you for subscribing to the SDMyers email. Then use a magnet to remove the metal particle from the oil by putting is through the oil-testing cup. Used to observe darkening of the oil by comparing it to previous samples of oil from the same transformer. Noticeable darkening oil indicates either contamination or that arcing is taking place. The mineral-based oil like transformer oil is frequently used in different types of transformers for its dielectric strength as well as electrical properties. Transformer oil is not any ordinary oil. Oil color is determined by means of transmitted light and given a numerical value (0-5) based on comparison with a series of color standards. 2. Determines the presence of degradation in cellulosic materials such as paper, pressboard, and cotton, which generate furanic compounds in the insulating oil. This test is particularly useful in cold climates to ensure that the oil will circulate and serve its purpose as an insulating and cooling medium. You can take any method that I mentioned according to your oil sample condition. An oil sample tube and syringe is used to draw, retain and transport the oil sample in the … 5. It’s your responsibility to keep this active 24/7. Regular sampling and testing of insulation oil taken from transformers is a valuable technique in a preventative maintenance pr ogram. Take the average value as a test result. First check the transformer oil tester is powered up or not. Its use to call transformer oil and it a little bit pricey. The intense electrical and thermal strain can catalyse or initiate undesirable changes in the properties oil which may turn it into a hazard further down the line. The power factor of insulating oil equals the cosine of the phase angle between an ac voltage applied and the resulting current. References: Transformer Oil Sampling NETA World Summer 2009, ASTM International, Wikipedia, Analyzing transformer insulating fluid - EC&M. This paper reviews some of the transformer oil tests and there significance. Now if you find this post useful then please share with your friends and let them know how to test the transformer oil practically. This early warning system can allow maintenance management to identify maintenance priorities, plan work assignment schedules, arrange for outside service, and order necessary parts and materials. But you have to remember one thing that you have to collect the down level of oil. If you want to stay updated with electrical engineering, then bookmark or subscribe (Newsletter) to our website. In extremely cold climates, specific gravity can be used to determine whether ice will float on the oil. 3. 5. Now covered the cup and run the test three times. Now for testing of the transformer oil has two methods. Oil Condition: General ‘Physicals’ Analysis. You can take any method that I mentioned according to your oil sample condition. 2. Indicates the volatility of insulating oil by measuring the minimum temperature at which the heated oil gives of sufficient vapor to form a flammable mixture with air. Moisture content in oil lowers the insulating system dielectric strength and allows flashover that can damage a transformer. Enter your email address to subscribe our blog. A low resistivity reflects a high content of free ions and ion-forming particles in the insulating oil, and normally indicates a high concentration of conductive contaminates.
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