Transformer oil analysis provides a highly accurate indication of the internal condition of a transformer. With dga, samples are taken of the oils exhaust gases to determine if any events have occurred that might be detrimental to the transformer and reduce its life. Bdv test is an very important testing procedure for the insulation oils in transformer. Furan analysis and of testing of transformer oil powerlink. Despite the apparent superiority of naphthabased oil, paraffin oil remains the most commonly used type of oil in transformers worldwide. Providing total confidence in the quality and reliability of transformers with interteks. Initial testing will establish a base line and annual testing will plot any changes happening internally in the transformer. This early warning system can allow management to identify maintenance priorities, plan work assignment schedules, and order necessary parts and materials. Use our free transformer asset management tool to automatically assess your transformers health. Periodically bdv testing is the main way to monitor and check the oils quality. The priciples of routine, type and special tests are however. Transformer winding resistance measurement is carried out to calculate the i 2 r losses and to calculate winding temperature at the end of a temperature rise test. This guide describes methods of testing and specifications for electrical insulating oils of petroleum origin intended for use in electrical cables, transformers, oil circuit breakers, and other electrical apparatus where the oils are used as insulating, or heat transfer media, or both.
Identifies various gas ppm levels that are present in transformer insulating oil. Study of furanic compounds in transformer oil study conclusions the main objective of establishing a data bank for various age groups of transformers has been met and the analysis of results detailed in chapter 7. The megger guide to insulating oil dielectric breakdown testing. Testing of power transformers seems like a similar experience. After the transformer oil test is completed, the insulation oil is stirred automatically and the test sequence is performed repeatedly. The sdmyers transformer oil testing lab is the largest in the world. The main physical and chemical properties tested in transformer oil testing methods are the oil s dielectric strength, dissipation factor, flashpoint, color, amount of solid particulate matter, water content, gas content and the oil s acid number. Specific transformer oil test method availability will vary depending upon location. Acids and other oxidation products will, in conjun. The quality of the analysis is as good as the sample drawn. 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. Before conducting a transformer winding resistance test, it is important to observe all safety warnings and take proper precautions.
If a proactive approach is adopted based on the condition of the transformer oil, the life of the transformer can be extended. Who needs to perform dielectric breakdown voltage tests. Making a wellinformed choice in equipment for transformer testing is an important step towards ultimately improving transformer life management decisions. A transformer oil breakdown test set is an equipment that measures the dielectric strength of the oil. Acidity contnet test is done on transformer oil to measure the acidity content of oil its unit is mgkohgm of oil. When testing the quality of insulating liquids, you are able to decide, based on the results, whether the insulating effect of transformers makes it possible to. The acidity of a used oil is due to the formation of acidic oxidation products. New oil should have a minimum dielectric strength of 35 kv by astm methods of testing. Today, all of meggers oil test set design, development and manufacture is carried out at the companys.
Bdv means breakdown voltage, also named as dielectric strength valve. Transformer oil purchase specifications developed under the auspices of the doble oil committee march, 2017 composition this specifications covers new insulating oil for general applications for liquidfilled electrical equipment, which are manufactured from mineral crude, which may be either naphthenic, which has a very low naturally. This early warning system can allow maintenance management to identify maintenance priorities, plan work assignment schedules, arrange for outside service, and order. In the experiment proper, we considered only the acidity, whose concentration in the transformer oil increases with aging if the. When ac hipot tests are used for routine maintenance, the power transformer can be examined at rated voltage for 3 min instead of testing at 65% of factory test voltage. During the transformer operation for a period, insulation oils will become dirty degradation which results in loosing function of the oil in transformer as insulation and cooling, in that case. Gases generate by degradation of fluid or cellulose. Astm d117 18 standard guide for sampling, test methods, and. Job safety analysis power transformer testing check this is the latest process zone version before use. Oil test laboratories providing testing services transformer and switchgear manufacturers quality control of oil oil companies testing new oil during manufacture 5. The detection and interpretation of certain key gases and gas quantity ratios allows the transformer. Special tests of the transformer are done as per customer requirement to obtain information useful to the user during the operation or maintenance of the transformer. Through proper testing, the transformer s lifespan is increased, reducing the need to pay for replacement.
Transformer oil, a type of insulating and cooling oil used in transformers and other electrical equipment, needs to be tested periodically to ensure that it is still fit for purpose. When ac hipot tests are used for routine maintenance, the power transformer can be examined at. Transformer oil testing is a proven loss prevention technique which should be a part of any condition based predictive maintenance program. Oil testing consists of measuring the breakdown voltage, and other chemical and physical properties of the oil, either through portable test equipment or in a laboratory. The test and assessment of transformers is a complicated task. Both industrial transformer users and utilities are setting up these planned sampling programs using online devices that can monitor the oil for quality. Transformer precommissioning tests and afterreceipt. Breakdown voltage bdv testing of transformer oil youtube. Mlgw began to test each of its transformers for furans in 2009. Various electrical tests must be performed and their significance and short description are given below. Basics, maintenance, and diagnostics ix contents continued page 6. Dissolved gas analysis guide for transformers filled with. The transformer oil is used in the transformer for insulation as well as for cooling purpose. Transformer testing type tests and routine tests of.
Development of an ongoing maintenance program will help prevent costly failures. Astm d117 18 standard guide for sampling, test methods. Oil sampling and analysis north vancouver facility we are pleased to submit the insulating fluid report and test sheets for the three 3 transformers and one 1 ocb located at the north vancouver facility. The measuring equipment differens from those explained herein. All transformers generate different gases during normal operation. Transformer oil analysis, transformer oil testing lab. Before attempting to draw the sample identify the type of cooling liquid in the transformer. An internal fault in a transformer can be discovered earliest using this test method. Neil dwyer, manager technical services ergon energy corporation limited abn 50 087 646 062 ergon energy queensland pty ltd abn 11 121 177 802 risk score task no. Testing of transformer or insulating oil 1 transformer oil, a type of insulating and cooling oil used in transformers and other electrical equipment, needs to be tested periodically to ensure that it is still fit for purpose. That means we have the capability and capacity to provide effective, accurate test results quickly. Jan 23, 2017 breakdown voltage bdv testing of transformer oil. Conducted with the latest in precision measurement, testing, analytical equipment and instruments by leading multidisciplinary engineers and scientists, our testing services provide best practice and scientific. Meggers experience in the design and production of oil test sets also reaches back to the early 20th century, when pioneering equipment was produced by foster transformers, a company that became part of megger group in 1968.
If regularly conducted, oil analysis allows identification of specific fault conditions that may be developing. The objective of the research is to use the furan compound analysis in operating oil transformer to determine their degree of polymerization, diagnose faults and know. In this book we have laid down important aspects on transformer. With transformer oil this is done through testing of the oil. Furan indicates the abnormal stress, overheat, short duration in a transformer. Transformer oil testing quick, simple and onsite b2hv. Oil used in transformer as the insulating material. Lewand was formerly manager of transformer fluid test laboratory and pcb and oil field services at met electrical testing company, baltimore, maryland. Page 3 of 8 reference sp0504r01 ver 1 reference owner. It evolved from the simple gonogo verdict into a sophisticated segment within transformer manufacturing.
Transformer oil testing by robert turcotte, manager, electrical loss control the hartford steam boiler inspection and insurance company the value of transformer oil testing transformer oil testing is a proven loss prevention technique which should be a part. One nettlesome aspect of electrical equipment that runs 24 hours a day, seven days a week is the need for continual testing and maintenance to ensure both safety and proper. Regular sampling and testing of insulation oil taken from transformers is a valuable technique in a preventative maintenance pr ogram. Transformer and insulating oils are subject to electrical and mechanical stresses while a. Pdf significance of transformer oil testing researchgate. Veer make oil bdv is specially designed for testing oil breakdown voltage. Asmaybeseenfromthistestthevariationsin readingswere not reduced bythismethod i. Mineral oil is the most common insulating fluid and has been in use since the late 19th century.
In this writeup, we have considered eleven transformer oil properties. Gray transformer chemistry services introduction the fault free operation of power transformers is a factor of major economic importance and safety in power supply utilities and. Transformer oil testing is a proven loss prevention technique that should be a part of any condition based predictive maintenance program. Transformer oil test methods include astm, bs,and other recognized transformer oil analysis testing procedures. Testing of transformer oil is necessary for the obtain breakdown strength of oil. It is fully automatic test kit developed to test oil sample as per is6792iec 60156 with printer facility. Transformer oil maintenance electric energy online.
See bigger list of transformer oil testing methods in the end of the article. Transformer oil analysis basic introduction by n robinson, wearcheck as blood tests disclose ones state of health, so oil analyses disclose the condition of a transformer. Transformer precommissioning tests and afterreceipt checks. It is carried out as a type test as well as routine test. Ensure that all equipment to be tested is properly grounded and treat all highvoltage power equipment as energized until proven otherwise by using the proper lockouttagout procedures. Hipot test is typically used for acceptance testing or after transformer repair testing. Detects most internal faults, some external faults and some operational errors. The transformer oil testing device measures and reports the root mean square value of the breakdown voltage. May be generated in very small quantities at lower temperatures e. Over the past five decades we have generated millions of test results from thousands of highvoltage units, and we process samples from transformer owners across the country. When the testing result shows a very low value, the oil has to be replaced or purified. The dielectric breakdown voltage is measured by applying a voltage between two electrodes under the oil. To determine dielectric strength, transformer oil is periodically tested by means of an oil punching apparatus.
It is also done at site to ensure healthiness of a transformer that is to check loose connections, broken strands of conductor, high contact resistance in tap changers, high. The transformer was immediately taken offline and internally inspected to identify any problems. Insulation resistance tests are performed to determine the. Trafol guide to transformer oil testing dissolved gas analysis dga fault gas advised action carbon dioxide co2 carbon monoxide co hydrogen h2 methane ch4 ethane c2h6 ethylene c2h4 acetylene c2h2 condition 1 normal. All of these factors affect the amount of testing necessary to certify that a transformer is ready to be energized and placed in service. Transformer oil, a type of insulating and cooling oil used in transformers and other electrical equipment, needs to be tested periodically to ensure that it is still fit. Introduction to transformer testing solid insulation transformer oil testing transformer oil moisture in transformers dissolved gas analysis analysis for furanic compounds and nonroutine oil tests electrical testing principles interpreting oil test results and maintenance options part 3. To test the oil sample, transformer oil is poured into a porcelain vessel in which two disk electrodes, one of 8mm diameter and one of 25mm diameter, are mounted. The ac hv test value should not surpass 75% of the factory test value. Transformer testing has developed considerably over the past years. Learn what transformer oil is, how to test transformer oil and the different types and properties. Using a combination of these diagnostic tests allows the oil to. While the generic term oil is almost universally used to describe insulating fluids, there are currently five different.
There are many types of organisation that benefit from carrying out tests on transformer oil. The different insulating materials have different dielectric strength. Failure to remove the temporary transportation bracket on the live portion of tap. The amperage rating for your transformer fuse may be labeled on the transformer, but will also be. Test this by hooking up the secondary to its circuit and using your dmm to test the secondary lines. The objective of the research is to use the furan compound analysis in operating oil transformer to determine their degree of polymerization, diagnose faults and know the aging state of the. This guide is classified into the following categories. The performance characteristics of transformer insulating oil are monitored and tested at several stages during its service life. There are a multitude of checks and tests performed as a transformer is being assembled at a substation. The following 5 part tests are a minimal requirement of a yearly maintenance. Testing power transformers test procedures and equipment used for the testing of large power transformers at abb oy, power transformer, vaasa works are dealt with in the following sections. The insulating material should sustain the voltage up to its dielectric strength. Analysis of dissolved gases in transformer dielectric oil is often the best method of detection certain problems that may eventually lead to failure of the transformer.
How to proceed the dielectric strength test for transformer oil. Transformer precommissioning tests and afterreceipt checks you. When the paper insulation ages, the mechanical strength of the transformer decreases. Routine testing of transformer oils and insulating oils on a regular schedule is an accepted industry.
Testing sequences and procedures are defined by various international standards, many of them set by astm. The megger guide to insulating oil dielectric breakdown. The automatically generated report of the transformer oil testing sequence is available as a pdf version and is stored to the internal memory. Most of the electric power utilities adopt regular analysis of insulating oil samples as a basic requirement of transformer maintenance program. Oil pressure test on the transformer to check against leakages past joints and gaskets. It is the combination of four carbons with hydrogen and one oxygen. Testoils engine oil analysis is designed to uncover lubrication anomalies generated by faulty mechanical issues as well as mechanical issues brought on by lubrication problem. Bluetooth connection as means of communication with the instruments a usb flash drive interface and a bluetooth connection is offered. Transformer oil testing by robert turcotte, manager, electrical loss control the hartford steam boiler inspection and insurance company the value of transformer oil testing transformer oil testing is a proven loss prevention technique which should be a part of any conditionbased predictive maintenance program. Testing consists of measuring breakdown voltage and. Ppt transformer tests powerpoint presentation free to. A 40yearold transformer showed a degree of polymerization of 260 in early 2010 during testing, with estimated remaining life at 19 percent.
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