A normal and acceptable acid number is 0.25 mg KOH/g, while the limit of contaminant content is 515 parts per million (ppm). 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. This paper reviews some of the transformer oil tests and there significance. A sample of transformer oil, taken correctly, can tell service engineers a great deal about the condition of a transformer. TRANSFORMER WORKSHOP. FUNCTION INTRODUCTION 1. If you disable this cookie, we will not be able to save your preferences. Transformer oil has to be tested to make sure that the performance and efficiency of the transformer are good. ppm: Neutralization (Acid) number: D974: New transformer oils contain practically no acids. Transformer oil testing and analysis is a cost-effective preventive maintenance tool for your electrical power system. 1. Measures the presence of soluble contaminants and oxidation products in transformer oil. ⚙️ The guide below outlines all the essential tests to assess the quality and fitness of insulating oil. 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. If conditions gets worse, and thermal combustibles elevate, the transformer will need to be taken out of service. Moisture and gas content in transformer oil must be tested for thoroughly. As the insulating materials in a transformer break down due to thermal and electrical stresses, gaseous byproducts are formed. Transformer oil or insulating oil is an oil that is stable at high temperatures and has excellent electrical insulating properties. The screen test is a collection of additional physical, electrical and chemical tests, including: dielectric breakdown, power factor, interfacial tension, acidity and color. TRANSFORMER OIL ANALYSIS Emerald Transformer’s laboratories are capable of performing a variety of tests to determine the condition and status of your oil-filled electrical equipment. Read More. Transformer oil keeps the transformer cool. Transformer Oil Testing Methods are key part of any maintenance program. Breakdown Voltage BDV Testing of Transformer Oil. Breakdown Voltage BDV Testing of Transformer Oil. RISING Transformer Oil Testing Equipment / Transformer Oil BDV Tester Skip to main content Call +1-800-655-4473 If conditions are not severe, the transformer should be monitored closely. Title: Microsoft Word - TROILANA.DOC Author: User Created Date: 6/15/2005 8:47:19 AM No single test alone will indicate the true condition of the liquid, so all the screen tests should be performed. This website uses cookies so that we can provide you with the best user experience possible. Results from such tests help guide planning for future maintenance on a transformer and help determine when replacement of a transformer may become necessary. A DGA test can identify an overloaded transformer by a test result showing high carbon monoxide, high carbon dioxide, and in extreme cases, even elevated methane and ethylene. Pour Point of Transformer Oil It is the minimum temperature at which oil starts to flow under standard test condition. Dissolved gas analysis (DGA) is the study of dissolved gases in transformer oil.It is also referred to as a DGA test. When the cellulose insulation breaks down to the point where arcing starts to occur, the transformer must be taken out of service. Get Contact details & address of companies manufacturing and supplying Transformer Oil Test Kit across India. Furan measures the degradation of cellulose paper. Transformer oil is crucial in the cooling process of a transformer. Moisture content in oil lowers the insulating system dielectric strength and allows flashover that can damage a transformer. Gas content is measured by an absorptiometric analyzer or a chromatographer. Oil Filtration Machine. Please contact Intertek for more information. All our transformer oils are tested thoroughly to ensure they are capable of meeting these demands. Transformer Oil Sampling & Testing. These tests include dielectric breakdown, power factor, inter-facial tension, acidity, and color. At Oil check we have the capacity to test oil from an aged transformer whether it be for maintenance, checking for any carry over after an oil change, disposal or refurbishment for such PCBs; ensuring that your equipment is compliant with the European Directive 96/59/EC. Specific transformer oil test method availability will vary depending upon location. 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 keeps the transformer cool. Normally, arcing occurs only after other problems surface which show up through DGA testing. Transformer oil is not any ordinary oil. The byproducts are characteristic of the type of incipient-fault condition. For additional information, contact our ALS laboratory in Sydney Australia. Its use to call transformer oil and it a little bit pricey. ANSI/ IEEE C57.104 or ASTM D3612, NETA, ATS-Sec.7.2.2.2.11 Temperature devices shall be installed and verify setting and operation. Timely oil monitoring and oil analysis programs can identify when the oil needs to be changed or serviced through an oil purification and/or oil regeneration process. Arcing can be generated in many areas of a transformer. The dielectric breakdown voltage is measured by applying a voltage between two electrodes under the oil. WATER CONTENT Test Method IEC 814 Water, in minute quantities, is harmful in power equipment because it is attracted to the places of greatest electrical stress and this is where it is the most dangerous. In the dielectric strength test of transformer oil, the test voltage should be raised to the specified value (or the breakdown voltage if it is less) at a uniform rate in 10-15 seconds and maintain for a one minute.Preliminary arcing should be ignored. Overheating of the liquid insulation is a slightly different problem in transformers and can be on of transformer oil testing methods. Transformer Oil Testing is a proven loss prevention technique which should be a part of any condition based predictive maintenance program. Early testing will set up a bottom line for contrast & yearly testing will design any changes inside the transformer. To evaluate the quality of the transformer oil testing, three steps are important to be carried out. Measurement of zero-sequence impedance of three-phase transformers ; Short-circuit test; Measurement of acoustic noise … An oil sample tube and syringe is used to draw, retain and transport the oil sample in the same condition as it is inside a transformer with all fault gases dissolved in it. Reliable testing … The oil circulates through the transformer by natural convection. Regular sampling and testing of insulation oil taken from transformers is a valuable technique in a preventative maintenance pr ogram. This early warning system can allow management to identify maintenance priorities, plan work assignment schedules, and order necessary parts and materials. Measurements are made by the amount of potassium hydroxide (KOH in mg) required to neutralize the acid in one gram of oil. It also insulates the transformer and allows electrical components to be more compact than free air apparatus. The breakdown voltage is that voltage at which sustained arcing takes place. Inspection : Anually. Sudden pressure relay . If the oil temperature falls below the pour point, transformer oil stops convection flowing and obstruct cooling in a transformer. Remove a sample of insulating transformer oil in accordance with ASTM D-3613 and test shall be performed for dissolved gas analysis (DGA). Regular monitoring of the oil’s quality and condition is a part of the process of servicing electric power equipment. Electronic on-line dissolved gas detectors can be connected to important or distressed transformers to continually monitor gas generation trends. Full testing, sampling and analysis; Heat vacuum oil purification plant The transformer’s fluid not only serves as a heat transfer medium, it also is part of the transformer’s insulation system. Testing of transformer oil is mandatory in yearly once for its maintenance. Different gasses will dissolve in the oil that indicate various types of thermal and electrical stress occurring within the transformer. See bigger list of transformer oil testing methods in the end of the article. Find here Transformer Oil Test Kit manufacturers & OEM manufacturers India. 2. The power factor of insulating oil equals the cosine of the phase angle between an ac voltage applied and the resulting current. Transformer oil test methods include ASTM, BS,and other recognized transformer oil analysis testing procedures. 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. The presence of acetylene is an indicator of arcing and so it’s one of the most important transformer oil testing methods; and even low levels of this gas should cause concern. A loose connection also may cause arcing, but of greater significance would be arcing due to insulation breakdown. This allows us to certify our test results with authority that very few laboratories across India can match. In general, an increased dissipation factor means degradation of the oil’s dielectric capabilities. The “screen test” is a collection of physical, electrical and chemical transformer oil testing methods. Why transformer testing is required. The color of transformer oil changes from light yellow to cloudy brown under the influence of temperature, contaminants and electric current. If the combustibles are stable and remain present, the transformer should be inspected at the next outage or downtime scheduled. Care should be taken when sampling transformer fluid and should be performed by a trained operator. If the oil becomes contaminated or begins to oxidize and breakdown, the performance is compromised and the transformer can short out or worse. Transformer oil is crucial in the cooling process of a transformer. The byproducts are characteristic of the type of incipient-fault condition. In addition, dissolved gases are extracted from the oil sample, separated, and quantified in a gas Chromatograph. 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. During the course of the oil’s service life, the stability of the oil decreases and visible changes occur and oil’s color slowly becomes darker and darker. However, the high energy required to produce an arc will cause all combustibles to be elevated. When the standards and principles stated by ASTM are followed, then it results in good oil. Expert transformer condition diagnostics backed by five decades of data-driven wisdom. Measurement of zero­sequence impedance of three­phase transformers 3. An annual DGA is the most important test for liquid insulation. A portion of the insulation may deteriorate until it can no longer contain the stress of the electrical conductor. Power factor Open all the valves of each accessory and component to the main body, so that all accessories except the oil conservator and gas relay (including the cooler and radiator) are connected to the transformer for vacuum pumping. Measured in ppm, it also applies to the determination of PCB present in mixtures known as askarels. We provide you with fast analyses to IEC, ASTM, and ISO standards, helping you identify issues quickly. That means we have the capability and capacity to provide effective, accurate test results quickly. The acidity test measures the content of acids formed by oxidation and contaminates. We'll assume you're ok with this, but you can opt-out if you wish. Servicing the oil before it becomes aggressive against the solid insulation is the key to extending the service life of your transformers. The transformer quality can be performed through the following tests. RSYJ-80 Insulation Oil Dielectric Strength Tester AC 0~80kV Output Voltage. Additional useful tests performed by transformer oil laboratories include those for water content, PCBs furanic compounds and metals-in-oil. Specific transformer oil test method availability will vary depending upon location. Corona is considered to be partial discharge and occurs at areas of high electrical stress, such as at sharp points along an electrical path. Transformer oil is crucial in the cooling process of a transformer. If a transformer is overloaded for a long period of time, the deteriorating condition of the cellulose will shorten the life of the transformer. This test indicates aging, quality and the presence of contaminants in the transformer 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. Indicates the lowest temperature at which the insulating oil will flow. The transformer is the main part of an electrical distribution system so if it is not working properly then it will affect the distribution system. GlobeCore uses test results to diagnose transformer problems. 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. Transformer oil is not any ordinary oil. There are various factors in testing the oil and those are breakdown voltage, its properties, and many others. Follow us to know more about # InsulatingOil. We are accredited from NABL for high voltage electrical transformer testing. Maintenance of substation transformers is often neglected, with potentially severe consequences. It is a characteristic of the oil’s quality and purity and acidity. The presence of solid particles in the oil and the acid number of the oil are two related oil purity characteristics. 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Transformer oil acts as an electrical insulating media and helps protect the components. Routine testing of transformer oils and insulating oils on a regular schedule is an accepted industry practice. (PCB) content. Measurements are made using high-performance liquid chromatography (HPLC). These services are performed by skilled and experienced transformer specialists, using … It is used in oil-filled transformers, some types of high-voltage capacitors, fluorescent lamp ballasts, and some types of high-voltage switches and circuit breakers.Its functions are to insulate, suppress corona discharge and arcing, and to serve as a coolant. Transformer Oil Testing is a proven loss prevention technique which should be a part of any condition- based predictive maintenance program. The oil treatment process is carried out using an oil filtration machine also known as insulating oil treatment plant or IOT. Water and gases are very damaging to your transformer insulation system and are two main cause of the oxidation process and oil aging process. Our transformer oil testing services offer you a complete solution to your transformer testing needs. Our laboratories in Australia maintain ISO and NATA certification for quality assurance and expertise. Top oil and winding thermometer. SDMyers has the largest transformer oil testing lab in the world, with packages that test for every known fault condition. Insulation breakdown in the windings, from coil to coil or coil to ground, will result in arcing. A decreasing value indicates an increase in contaminants and/or oxidation products within the oil. 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. Transformer oil testing is one of the important parts of a power 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. Furanic Compounds In Oil . Dissolved Gas Analysis is the single most important test performed on oils from transformers. Our testing procedure can be broken down into certain sectors. New oil should have a minimum dielectric strength of 35 kV by ASTM Transformer Oil Testing Methods. Indicates the dielectric losses of the oil, or energy that is dissipated as heat. 4. This test does not measure the water content in the transformer paper insulation. Pour point of transformer oil is a valuable property mainly at the places where the climate is icy. Tests that are concerned with the immediate condition and acceptability of the insulating oil include dielectric breakdown tests, moisture measurement by the Karl Fischer (KF) method, and dielectric dissipation factor. This early warning system can allow management to identify maintenance priorities, plan work assignment schedules, and order necessary parts and materials. The breakdown voltage is that voltage at which sustained arcing takes place. In this article, we will examine the value and benefits of each test. 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. No single test alone will represent or indicate the true condition of the liquid. Transformer oil test methods include ASTM, BS,and other recognized transformer oil analysis testing procedures. JY6611 transformer oil breakdown voltage tester use advanced voltage breakdown control technology which will keep breakdown energy in a very low level,that will avoid pollution to oil sample during testing and make sure the test result are accurate and reliable. Oil Tests . A blood test provides a doctor with a wealth of information about the health of a patient. In some transformers, that meets the minimum operating standard. Testing MIDEL 7131 and MIDEL eN. Manufacturer HZJQ-X1 Portable Transformer Oil Dielectric Strength Test Equipment. This website uses cookies to improve your experience. Electrical and thermal stress or chemical contamination can cause failures and reduced component life. When new, transformer oil has a very light color and complies with performance standards that include dielectric strength and other important characteristics. Dielectric tests. To improve the cooling process, radiators or “fins” are installed on the side of a transformer. The paper insulation which is normally used to insulate the windings of a transformer is a cellulose product. Diagnostic testing, field maintenance & repairs. Used to observe darkening of the oil by comparing it to previous samples of oil from the same transformer. Learn More. Insulating oil – DGA, physical, and chemical tests : Anually. It also insulates the transformer and allows electrical components to be more compact than free air apparatus. The transformer turns ratio test is used to make sure that the ratio between the … In a used oil it measures the amount remaining after oxidation has reduced its concentration. Technical complexities of transformers combined with high capital cost and long life expectancy pose unique decision-making challenges to asset managers. Decreasing dielectric strength is caused by contamination of the oil by gas, moisture, cellulose fibers or other particulate matter. So, insulation overheating measurement is also transformer oil testing methods. The insulating fluid in a power transformer performs two major functions: Serves as electrical insulation to withstand the high voltages inside the transformer Transformer LifeCycle Management 'ZERO' Breakdown | NO Production Loss FIELD SERVICES. RSDDG Switchgear Testing Equipment for Current Load Test and Temperature Rise Test. For mineral oil, a generally accepted maximum moisture content is 35 ppm. If a transformer becomes overloaded for any reason, the windings will generate more heat and deteriorate the cellulose insulation. New transformer oils contain practically no acids. Transformer oil testing is one of the important parts of a power transformer.This test will be performed when your power transformer cooling system is an oil type. In extremely cold climates, specific gravity can be used to determine whether ice will float on the oil. So it has to go through numerous testing procedures. Insulating Oil(Transformer Oil) Testing is an essential part of any maintenance plan for the transformer. Learn More. Oil testing allows the operator to determine the equipment’s operating efficiency, conditions and the possibility of future malfunctions. Oil pressure test to check the leakages at joints and gaskets on the transformer; Special Tests. Transformer testing is done for confirming the specifications and performance of an electrical power transformer. It is well known that regular oil analysis is useful in monitoring the condition of engines, turbines and other oil lubricated equipment. For more information regarding transformer oil testing you can read our following article: Transformer Oil Testing: Types, Methods and Analysis. Transformer Oil Testing Transformer oils are subject to electrical and mechanical stresses while a transformer or other electrical distribution equipment is in operation. The oil pressure test on transformer to check against leakages past joints and gaskets is included. Oil level indicator operation : 5 years. The degradation materials produce CO and CO2 gases. As the insulating materials in a transformer break down due to thermal and electrical stresses, gaseous byproducts are formed. Each test is an indication of how suitable the insulation liquid is for service. Routine test of transformer oil: This test of transformer oil is so important. By the Furan analysis, we check the condition of paper in transformer oil. Transformer Oil Analysis for Maintenance Programs Anne Reygaerts, Laborelec. The SDMyers transformer oil testing lab is the largest in the world. Other tests, such as dissolved gas, normally require a sample to be sent to a laboratory. Whenever a transformer undergoes abnormal thermal and electrical stresses, certain gases are produced due to the decomposition of the transformer oil. Doble test equipment is also used to conduct excitation current tests, which can … Transformer Oil Testing is a proven loss prevention technique which should be a part of any condition based predictive maintenance program. Inspection & Sampling Transformer oil testing consists of measuring breakdown voltage and other physical and chemical properties of samples of the oil, either in a laboratory or using portable test equipment on-site. RSBS-IV Transformer Oil Testing Equipment Moisture ≤80 %RH 0.1 Resolution Ratio. Partial discharge is commonly explained as being intermittent. If the oil is fresh, the lowest allowable breakthrough voltage is 30 kV. From the sampling, we are able to detect the moisture content, power factor, dielectric breakdown, acid number and much more. oil type transformer maintenance. Turns Ratio Testing. 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. For mineral oil, the power factor of new oil should not exceed 0.05 percent at 25 degrees C. Determines the density, relative density (specific gravity), or API gravity of transformer oil by use of hydrometer at a reference temperature. The oil pressure test on transformer to check against leakages past joints and gaskets is included. Excitation Current. Identifies various gas ppm levels that are present in transformer insulating oil. RSBS-IV Transformer Oil Testing Equipment Moisture ≤80 %RH 0.1 Resolution Ratio. When arcing occurs in the area of the windings, the usual result is de-tanking of the transformer, and a rewind conducted. Measurement of the harmonics of the no­load current. It is therefore, essential to the life of the transformer to periodically monitor the condition of the insulating oil. Oil is visually examined by passing a beam of light through it to determine transparency and identify foreign matters.