Special Tests of transformer include. It is a characteristic of the oil’s quality and purity and acidity. Water and gases are very damaging to your transformer insulation system and are two main cause of the oxidation process and oil aging process. In this article, we will examine the value and benefits of each test. Insulating oil – DGA, physical, and chemical tests : Anually. In addition, dissolved gases are extracted from the oil sample, separated, and quantified in a gas Chromatograph. The acidity test measures the content of acids formed by oxidation and contaminates. The paper insulation which is normally used to insulate the windings of a transformer is a cellulose product. Measures the electrical insulating properties of transformer oil under conditions comparable to those of the test. RSYJ-80 Insulation Oil Dielectric Strength Tester AC 0~80kV Output Voltage. Full testing, sampling and analysis; Heat vacuum oil purification plant The acid number is expressed as milligrams of KOH required to neutralize all acids in a gram of oil and indicates the degree of oil aging. When new, transformer oil has a very light color and complies with performance standards that include dielectric strength and other important characteristics. Find here Transformer Oil Test Kit manufacturers & OEM manufacturers India. Transformer Oil Testing is a proven loss prevention technique which should be a part of any condition based predictive maintenance program. See more video about transformer oil purification. Dielectric strength is one of the most important indications of oil stability and this is often the first test performed. Manufacturer HZJQ-X1 Portable Transformer Oil Dielectric Strength Test Equipment. This paper reviews some of the transformer oil tests and there significance. It is well known that regular oil analysis is useful in monitoring the condition of engines, turbines and other oil lubricated equipment. Specific transformer oil test method availability will vary depending upon location. Measurement of zero-sequence impedance of three-phase transformers ; Short-circuit test; Measurement of acoustic noise … Cookie information is stored in your browser and performs functions such as recognising you when you return to our website and helping our team to understand which sections of the website you find most interesting and useful. Transformer oil is crucial in the cooling process of a transformer. Sudden pressure relay . These tests are carried out during the maintenance and operation of the transformer. MVA is not just an oil laboratory—we are a full service diagnostic company using our expertise and knowledge to help you protect your transformers. The oil pressure test on transformer to check against leakages past joints and gaskets is included. Some transformer oil tests can be carried out in the field, using portable test apparatus. 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. 5 years. New oil should have a minimum dielectric strength of 35 kV by ASTM Transformer Oil Testing Methods. Breakdown Voltage BDV Testing of Transformer Oil. That means Routine tests of transformer include all the type tests except temperature rise and vacuum tests. It also insulates the transformer and allows electrical components to be more compact than free air apparatus. Electrical and thermal stress or chemical contamination can cause failures and reduced component life. Our transformer oil testing services offer you a complete solution to your transformer testing needs. RSBS-IV Transformer Oil Testing Equipment Moisture ≤80 %RH 0.1 Resolution Ratio. The oil’s flashpoint and the oil’s setting point are two indications of the general fire safety of the oil and the oil’s ability to operate in adverse temperature conditions both hot and cold. If conditions are not severe, the transformer should be monitored closely. If a proactive approach is adopted based on the condition of the transformer oil, the life of the transformer can be extended. We'll assume you're ok with this, but you can opt-out if you wish. Our testing procedure can be broken down into certain sectors. When the fault is major, the production of decomposed gases are significant and they get collected in a Buchholz relay. Regular monitoring of the oil’s quality and condition is a part of the process of servicing electric power equipment. 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. The condition of the oil, its purity and contamination level will greatly help in indicating the condition of the transformer’s solid insulation. When the standards and principles stated by ASTM are followed, then it results in good oil. Indicates the lowest temperature at which the insulating oil will flow. Its use to call transformer oil and it a little bit pricey. The byproducts are characteristic of the type of incipient-fault condition. Routine testing of transformer oils and insulating oils on a regular schedule is an accepted industry practice. Typical motor oil that most people think of, is not the type of oil in a transformer. A sample of transformer oil, taken correctly, can tell service engineers a great deal about the condition of a transformer. If the oil becomes contaminated or begins to oxidize and breakdown, the performance is compromised and the transformer can short out or worse. Higher values are indicative of a problem. The dielectric breakdown voltage is measured by applying a voltage between two electrodes under the oil. Transformer testing is done for confirming the specifications and performance of an electrical power transformer. Heating may be caused by poor contacts on a tap changer, or loose connections on a bushing or a grounding strap, or circulating currents in the core due to an unintended core ground. The breakdown voltage is that voltage at which sustained arcing takes place. 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. If the arc occurs in the area of cellulose insulation, carbon dioxide and carbon monoxide also will be elevated. Detects the concentration level of polychlorinated biphenyls in transformer oil by gas chromatography. A normal and acceptable acid number is 0.25 mg KOH/g, while the limit of contaminant content is 515 parts per million (ppm). See bigger list of transformer oil testing methods in the end of the article. The ability of insulating oil to maintain its original performance characteristics during long term operation of electric equipment is referred to as “oil stability.” If the electric power equipment has no defects and operates in accordance with design and expectations, the performance characteristics of new oil will change and degrade slower. Insulating Oil(Transformer Oil) Testing is an essential part of any maintenance plan for the transformer. So, insulation overheating measurement is also transformer oil testing methods. Pour Point of Transformer Oil It is the minimum temperature at which oil starts to flow under standard test condition. Transformer Oil Sampling. All our transformer oils are tested thoroughly to ensure they are capable of meeting these demands. Megger provides laboratory grade oil test equipment, backed by experience reaching back to the early 20th century, to test these fundamental characteristics of insulating oil. For more information regarding transformer oil testing you can read our following article: Transformer Oil Testing: Types, Methods and Analysis. If the oil is fresh, the lowest allowable breakthrough voltage is 30 kV. Designed by experts, these Oil Test Sets are subjected to provide complete satisfaction to the clients. Excitation Current. The oil circulates through the transformer by natural convection. The “screen test” is a collection of physical, electrical and chemical transformer oil testing methods. In extremely cold climates, specific gravity can be used to determine whether ice will float on the oil. Typically, results of 0.10 mg KOH/gram of oil or less are considered good. RSBS-IV Transformer Oil Testing Equipment Moisture ≤80 %RH 0.1 Resolution Ratio. Arcing can be generated in many areas of a transformer. oil type transformer maintenance. Transformers degrade over time, and failure to collect oil samples and conduct testing can allow problems to go undetected, causing increased operating costs and downtime. If the oil temperature falls below the pour point, transformer oil stops convection flowing and obstruct cooling in a transformer. Transformer oil or insulating oil is an oil that is stable at high temperatures and has excellent electrical insulating properties. Transformer oil test methods include ASTM, BS,and other recognized transformer oil analysis testing procedures. Electrical and thermal stress or chemical contamination can cause failures and reduced component life. It is therefore prudent to periodically perform tests on the oil to determine whether it is capable of fulfilling its role as an insulant. Measured in parts per million (ppm) using the weight of moisture divided by the weight of oil. Unsolved materials accumulated in the oil in the form of sludge or suspended particles (fibers, dust, solved paint, metal particles, ash etc) degrade the oil’s dielectric properties and promote oil oxidation. Analysis of gases in the oil can indicate insulation overheating/overloading, liquid overheating, partial discharge (corona), or arcing in the transformer. Measures the amount of 2,6-ditertiary-butyl paracresol and 2,6-ditertiary-butyl phenol that has been added to new insulating oil as protection against oxidation. 5. Pour point of transformer oil is a valuable property mainly at the places where the climate is icy. Dielectric tests. The heart of the transformer is the solid insulation, but the insulating oil is the life blood of the transformer. This test does not measure the water content in the transformer paper insulation. Actions that can be taken once a thermal gas problem is detected would depend on the severity of the problem. The acidity test measures the content of acids formed by oxidation and contaminates. Dissolved gas analysis (DGA) is the study of dissolved gases in transformer oil.It is also referred to as a DGA test. Title: Microsoft Word - TROILANA.DOC Author: User Created Date: 6/15/2005 8:47:19 AM Oil is visually examined by passing a beam of light through it to determine transparency and identify foreign matters. It is certified to ISO/IEC 17025 standard for chemical and biological testing and is as established as the transformer plant itself, having been in continuous operation for > 30 years. 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