If regularly conducted, oil analysis allows identification of specific fault conditions that may be developing. They can now be applied to transformers filled with beta fluid. Transformer oil is crucial in the cooling process of a transformer. Then solid materials and oil were put in the ageing test vessel. As the name implies, this test analyzes the type and quantity of gases that are dissolved in the transformer oil. Procedures for drawing transformer oil samples general sampling electrical insulating oil for laboratory analysis requires care to ensure that the sample is representative of the product being sampled. It is used in oilfilled transformers, some types of highvoltage capacitors, fluorescent lamp ballasts north america only, and some types of highvoltage switches and circuit breakers. Unfortunately, transformer oil does degrade over time which can make the cooling and insulation processes around a transformer less effective. Whenever a transformer undergoes abnormal thermal and electrical stresses, certain gases are produced due to the decomposition of the transformer oil. Other methods have been used to perform this analysis. About 80% of these are testing equipment, 6% are other test instruments.
There are many reasons to do oil sampling and analysis as a core part of a preventative maintenance program and also during commissioning. Along with an indepth commentary on the key influencing factors, market statistics in terms of revenues, segmentwise data, regionwise data, and country. 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 above standard testing is offered in specific diagnostic suites designed to provide the maximum condition information on the transformers. The transformer failed in service while undergoing poweron purification to remove moisture from the insulating oil. Before attempting to draw the sample identify the type of cooling liquid in the transformer. The distribution of these gases can be related to the type of electrical fault, and the rate of gas generation can indicate the severity of the fault. Pdf evaluating transformer condition using dga oil analysis. Transformer oil uninhibited is a highly refined, efficient performance uninhibited transformer oil, providing high dielectric strength and reliable low temperature performance. Transformer oil surrounds and insulates the coil windings in highvoltage transformers. Transformer oil or insulating oil is an oil that is stable at high temperatures and has excellent electrical insulating properties.
In chapter three and four, an extended discussion on the transformer oil properties is made, taking into consideration the eleven most important ones. The acidity level of transformer oil is measured as per british standard bs2000 part 1. Transformer oil gas analysis cont manual sample handing. The megger guide to insulating oil dielectric breakdown. Transformer oil market global industry analysis, size and.
The insulating material should sustain the voltage up to its dielectric strength. It is formulated with a mineral base stock and provides good oxidation stability. Dissolved gas analysis dga is the study of dissolved gases in transformer oil insulating materials within transformers and electrical equipment break down to liberate gases within the unit. This application note points to the precautions that need to be taken. As oil has to be broken down into very specific forms such as transformer oil, making sure it is still in the correct form is an essential process. Dissolved gas analysis guide for transformers filled with. After this process, the humidity content of solid samples was less than 0. Evaluating transformer condition using dga oil analysis.
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. The standard test suites are designed for individual samples to deliver a routine set of oil analysis at low cost. Transformer oil testing for dielectric strength vessel preparation and elimination of the effects of moisture and contamination play a major role in successful oil testing. Astm d3612 022017 standard test method for analysis of. Too high an oil level in a bushing generally means the seal in the bottom of the bushing has failed and oil head from the conservator, or nitrogen pressure, has pushed transformer oil up the bushing. Transformer oil fulfils the requirements of an iec 60296. Our transformer oil testing services offer you a complete solution to your transformer testing needs. Ageing assessment of transformers through oil test database analyses and alternative diagnostic techniques conference paper pdf available september 2015 with 2,395 reads how we measure reads. Dissolved gas analysis of transformer oil electrical4u. Astm d117 18 standard guide for sampling, test methods. Dnv gl provides independent oil laboratory services covering sampling, analysis and interpretation. Deschiptionoraffaratusakdmfthod thetestapparatususedvtasmadebymr. 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. 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.
Transformer testing, transformer oil analysis lab, transformer oil test lab, oil transformer test sl no. Like blood testing in human beings, its an essential indicator of good health. This test can give an early indication of abnormal behavior of the transformer. The co vs furanic compound charts graphs in chapter 7. Test parameters transformer oil testing laboratory. The megger guide to insulating oil dielectric breakdown testing. Mineral oil is the most common insulating fluid and. The electrical properties of oil can suddenly change due to changes in oxidation, acids, sludge gas and even water absorption, so thats why its essential to regularly test oil samples for.
Gases generate by degradation of fluid or cellulose. Product information dissolved gas analysis and supervision. Transformer oil analysis provides a highly accurate indication of the internal condition of a transformer. This transformer oil market study offers a comprehensive analysis of the business models, key strategies, and respective market shares of some of the most prominent players in this landscape. If a problem is observed in the transformer in stage 1 through its condition evaluation, a dissolved gas in oil analysis dga test. Electrical and thermal stress or chemical contamination can cause failures and reduced component life. The ultimate starting point for any transformer assessment is the oil analysis. 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 industrial consumers of electricity. During operation, the oil oxidizes and the oxidation products accumulate in.
Testing sequences and procedures are defined by various international standards, many of them set by astm. Nabl accrediated transformer oil testing lab transformer oil test labnabl nabl accredited testing laboratory as per isoiec 17025. The transformer oil is used in the transformer for insulation as well as for cooling purpose. Pdf ageing assessment of transformers through oil test. 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. Detects most internal faults, some external faults and some operational errors. Few important step for this experiment that you should know 1. Valve option 752 automate two valves 78900047 configured per. All data can be downloaded either as adobe pdf or in text format by email for import into the delta x transformer oil analyst program, or databases such as.
Service contract for carrying out the transformer oil. Dissolved gasinoil analysis the most important test that can be done on the liquid insulation of a transformer is an annual dissolved gas analysis dga. Dissolved gasin oil analysis the most important test that can be done on the liquid insulation of a transformer is an annual dissolved gas analysis dga. Requires 1 litre of oil in a polyethylene container. Characteristics of transformer oil requirement method of test 12 oxidation stability after 164 hrs. A wide variety of transformer oil tester options are available to you, such as usage, power. The rise in furanic compound ent equilibrium time similar to that of reconditioning process. It is noted that the oil quality tests for transformer oil are inconclusive and that the dga test is then necessary. Oil diagnostic suites for transformer oil diagnostics.
The top seal has probably failed also allowing air and moisture to enter the top. Transformer oil analyst software, the fault condition of the transformer can be diagnosed. We have nabl approved transformer oil test laboratory and render our service on short calls as and when required by you with our expert comments and suggestion promptly. Transformer oil analysis testing service for monitoring the condition of transformer oils routine testing of transformer insulating oil is an essential maintenance function that ensures a safe working environment and helps eliminate the possibility of disrupted production resulting from a transformer failure or explosion. Basics, maintenance, and diagnostics ix contents continued page 6.
These include the chemical and causes of the specific physical properties of the test oils. From the test results it shall be identified that acidity content is high for degraded oil. In general, the solubilities and thermal decomposition products of beta fluid are very similar to those from conventional transformer oil. Test parameters test method ref standard 01 interfacial tension ring method is. When the fault is major, the production of decomposed gases are significant and they get collected in a. To make sure that transformer oil does not need replacing, it is important to perform a breakdown voltage test using an insulating oil tester. Dissolved gas analysis dga is the study of dissolved gases in transformer oil. As part of routine testing regular oil testing enables comparative analysis over time.
Astm d3612a 15 gas chromatography for the energy industry july 17, 20. From my experience, untreated, raw transformer oil has to withstand 40 kv per 2. So, insulation overheating measurement is also transformer oil testing methods. Transformer oil testing measurement of interfacial tension for ensuring the quality of transformers. The different insulating materials have different dielectric strength. Its functions are to insulate, suppress corona discharge and. Transformer oil tests electrical engineering enersol. In this video you will know how to perform a oil test experiment for power transformer in a laboratory.