Std 621995 guide for diagnostic field testing of electric power apparatus part 1. There are two main types of maintenance of transformer. Testing will commence only after the equipment is completely installed as per approved method statement for the installation of the transformer and released for testing commissioning. Electrical and thermal stress or chemical contamination can cause failures and reduced component life. Transformer oil is crucial in the cooling process of a transformer. Aug 08, 2017 transformer oil testing is one of the important parts of a power transformer. Scribd is the worlds largest social reading and publishing site. Pdf the incessant failure in the insulation level of power transformers has. Like blood testing in human beings, its an essential indicator of good health.
The standard test suites are designed for individual samples to deliver a routine set of oil analysis at low. Power transformers oil testing services israel engis offers wide range of laboratory services based on the rich and global experience of doble engineering. Transformer oil analysis and testing power transformers. Transformer oil testing is one of the important parts of a power transformer. Aging assessment of power transformer using multiparameters. This 34minute video describes the purpose of power transformer oil testing, how to take oil samples, and the principles of performing field and lab oil tests. Aging assessment of power transformer using multiparameters yuan li 1, mingjie tang, fengjiao. Transformer oil testing is a cornerstone of an asset management program. Taking oil sample from power transformers dissolved gases astm d 3612, iec 60567, dissolved water astm d 1533, iec 60814 the following is one of the procedures to collect transformer oil sample. As contamination increases, the oil turns amber or dark brown. 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. Power transformer oil testing instant video alexander. Transformer oil or insulating oil is an oil that is stable at high temperatures and has excellent. The american society for testing and materials astm is the standard reference body used by.
Npm services offers a full line of transformer diagnostic tests to determine the integrity and serviceability of insulating fluids. Our transformer oil testing services offer you a complete solution to your transformer testing needs. The ultimate starting point for any transformer assessment is the oil analysis. The transformer oil is used in the transformer for insulation as well as for cooling purpose. Dec 15, 2016 oil analysis and testing provides all sorts of information about the oil as well as other possible issues like the water content in the oil, contact arcing and aging of the insulating paper within the transformer. Aging assessment of power transformer using multiparameters yuan li 1, mingjie tang, fengjiao wu2, guanjun zhang 1, shuhong wang, suwarno3 1 state key laboratory of electrical insulation and power equipment, xian jiaotong university, xian, shaanxi 710049, china. The impurity of insulating liquids is assessed with the help of breakdown voltage testing. Worlds leading reclaimer of transformer oil over 1 billion gallons processed. Tops is a set of specifications developed and maintained by the doble oil committee and is the basis for the annual oil survey testing. What is the minimum value of breakdown voltage of transformer oil. The transformer oil testing device measures and reports the root mean square value of the breakdown voltage.
Progusa provides support in the usa for power industry for power transformer test and oil purify includes dvpower, enervac and wika products. After the transformer oil test is completed, the insulation oil is stirred automatically and the test sequence is performed repeatedly. Transformer oil also known as insulating oil is a special type of oil which has excellent electrical insulating properties and is stable at high temperatures. Training sessions the purpose of transformer oil testing 3. Astm d117 18 standard guide for sampling, test methods. Power factor test results can help reveal the quality and the integrity of the insulation liquid. 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. When working properly and within specifications, transformer oil. Before attempting to draw the sample identify the type of cooling liquid in the transformer. The above standard testing is offered in specific diagnostic suites designed to provide the maximum condition information on the transformers.
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. The oil level in oil cap under silica gel breather must be checked in a onemonth interval. It evolved from the simple gonogo verdict into a sophisticated segment within transformer manufacturing. In this ieee standard, diagnostic tests and measurements that are performed in the field on oilimmersed power. In this book we have laid down important aspects on transformer. A power transformer requires various routine maintenance tasks including measurement and testing of different parameters of the transformer. Measurement of oil breakdown voltage by testing equipment megger. Let us first discuss about the action to be taken on power transformer in monthly basis. For a high voltage pulse power supply of 140kv amplitude, rise time 1usec, fall time 1usec, pulse width 6 usec and prf is 10 hz. The different insulating materials have different dielectric strength.
Astm d117 18 standard guide for sampling, test methods, and. If regularly conducted, oil analysis allows identification of specific fault conditions that may be developing. There are various test required on transformer to conform performance of transformer. Pdf thermal modeling and experimental analysis of power. If a proactive approach is adopted based on the condition of the transformer oil, the life of the transformer can be extended. The purchase, preparation, assembly, operation and maintenance of transformers represent a large expense to the power system. Transformer oil analysis provides a highly accurate indication of the internal condition of a transformer.
All the physical and gassing properties of the oil are also well understood with oil analysis and testing. Transformer and insulating oils are subject to electrical and mechanical stresses while a. Nov 17, 2019 monthly basis maintenance of transformer. Transformer oil is used in oil filled electrical power transformers to insulate, stop arcing and corona discharge, and to dissipate the heat of the transformer i. Aug 30, 2019 transformer oil also known as insulating oil is a special type of oil which has excellent electrical insulating properties and is stable at high temperatures. All materials and relevant documentation to this testing works shall be checked by the responsible personnel prior to the commencement of testing activities. Transformer testing has developed considerably over the past years. Extra 10% of total oil quantity for each transformer shall be supplied along with the transformers in sealed non returnable drums. May 31, 2017 in this video you will know how to perform a oil test experiment for power transformer in a laboratory. Oil testing of a highvoltage power transformer equisales. If it is found the transformer oil inside the cup comes below the specified level, oil to be top up as per specified level. If fault suspected, best to sample after 24 hours of fault to insure equilibrium of gases has been established.
Transformer oil is used in oilfilled electrical power transformers to insulate, stop arcing and corona discharge, and to dissipate the heat of the transformer i. In this ieee standard, diagnostic tests and measurements that are performed in the field on oilimmersed power transformers and regulators are described. 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. 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.
In this post, i will explain everything about this experiment and i will also. Dnv gl provides independent oil laboratory services covering sampling, analysis and interpretation. 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. Some transformer oil tests can be carried out in the field, using portable test apparatus. Our transformer oil analysis lab can is capable of conducting the following tests. The insulating material should sustain the voltage up to its dielectric strength. Testing power transformers highvoltage transformers are some of the most important and expensive pieces of equipment required for operating a power system. We perform one group on a routine basis known as preventative maintenance, and the second group on an adhoc basis i. Oil analysis and testing provides all sorts of information about the oil as well as other possible issues like the water content in the oil, contact arcing and aging of the insulating paper within the transformer. From the test results it shall be identified that acidity content is high for degraded oil. Specification substation power transformer horizon power. Thermal modeling and experimental analysis of power transformer oils. Acronyms and abbreviations a air ana selfcooled, nonventilated kw kilowatt ansi american national standards ieee institute of electrical and institute electronic engineers cegb central electric generating mdw moisture by dry weight board mg milligram cfm cubic feet per minute mva megavoltamps ch 4 methane nd not detected c 2 h 2 acetylene n 2 nitrogen.
These include the chemical and causes of the specific physical properties of the test oils. Sep 16, 2016 clean oil is a clear or yellowish color. Few important step for this experiment that you should know 1. When predictive maintenance transformer and oil tests has disclosed a serious problem of moisture, combustible gas andor oil decay products, and on site purification is the chosen procedure the following steps are suggested. Oil diagnostic suites for transformer oil diagnostics. Transformer oil analysis bureau veritas commodities. 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. This test will be performed when your power transformer cooling system is an oil type. Measurements of transformer oil paper insulation system, ieee trans. 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.
Pdf development of electrical breakdown in transformer oil. Worlds largest database of test records 4,000,000 customer transformer test records. Its use to call transformer oil and it a little bit pricey. Many companies use the doble transformer oil purchase specification tops and the annual oil survey to qualify oil suppliers, using these materials as independent assessments of commercially available oils. Test results are most valuable when they are charted over time. Purpose this document is to provide guidance to bureau of reclamation reclamation powerplant personnel in maintenance, diagnostics, and testing of transformers and associated. Maintenance of transformers a detailed checklist electrical4u. The ac hv test value should not surpass 75% of the factory test value. Field testing of fluidfilled power transformers, regulators, and reactors ieee std 57.
One of the most important testing that can be performed on the unit without having to open it up or take unit out of service. Mainly two types of transformer are done by manufacturer before dispatching the transformer mainly 1 type test of transformer and 2 routine test. In chapter three and four, an extended discussion on the transformer oil properties is made, taking into consideration the eleven most important ones. Coconut oil as an alternative to transformer oil pdf. All data can be downloaded either as adobe pdf or in text format by email.
Mobile oil testing companies can perform a full range of inspections and analyses to determine the health of the transformer and its dielectric fluid. Dec 27, 2019 the transformer oil is used in the transformer for insulation as well as for cooling purpose. 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. Conducted with the latest in precision measurement, testing, analytical equipment and instruments by leading multidisciplinary engineers and scientists, our testing services provide best.
Power transformer diagnostics, monitoring and design. Consistent sampling needed to provide accurate trending results of units. In this video you will know how to perform a oil test experiment for power transformer in a laboratory. Testing of power transformers seems like a similar experience. Power transformer oil testing an electrical engineer. Pdf power transformers are key equipment for transfer and distribution of the electric power.
Regular sampling and testing of insulation oil taken from transformers is a valuable technique in a preventative maintenance pr ogram. 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. Based on the test results, you will identify whether the oil has aged, e. A wide variety of transformer oil tester options are available to you, such as auto testing machine, strength testing machine, and universal testing machine. In this post, i will explain everything about this experiment and i will also provide you a live video link that you can understand. You can also choose from electronic, hydraulic transformer oil tester there are 687 suppliers who sells transformer oil tester on.
1111 1248 374 16 758 409 577 1205 824 1055 490 44 1264 1457 847 1026 1410 221 806 1480 585 40 172 1418 1086 884 1223 1032 1137 496 1517 1317 990 1162 901 899 91 489 125 1283 1211