Kinectrics provides complete transformer testing and consulting services in canada, the us, and worldwide to ensure the safe, reliable. Mainly two types of transformer are done by manufacturer before dispatching the transformer mainly 1 type test of transformer and 2 routine test. At electric power systems, we are committed to promoting a culture of safety within our organization. Switchgear and switchboard inspection and testing guide. Transformer oil test methods include astm, bs,and other recognized transformer oil analysis testing procedures. Insulation tests on current transformers rated 600v or less are usually performed at vdc. Doble power services leverages the resources of dobles library and team of more than 70 engineers with extensive experience in transformer, substation, rotating machinery and power systems engineering applications. A presentation ontransformer testing using dpatt3bi 2. Hv test is iso9001 audited and accredited and the largest supplier and market leader in all the aspects of test equipment sales, repairs and calibration, high voltage training courses, and commissioning and maintenance field services in the medium voltage, high voltage and extra high voltage electrical engineering fields. It is typical the use of high voltage testing on transformers to confirm performance. The analytical services performed by dobles materials laboratories provide you with the accurate information you need to intelligently diagnose any existing and potentially devastating problems in your liquidfilled equipment. Serves as electrical insulation to withstand the high voltages inside the transformer. During construction, and before, startup, new electrical systems and components must meet application specifications, manufactures tolerances, installation and construction codes and standards, and system design specifications.
Testing and diagnostics of power transformers brochure 4. Heres a summary of the current transformer testing paper. Smit transformer service sts is the service department of royal smit transformers b. Instrument transformer theory and testing steve hudson, pe engineering manager 10737 lexington drive knoxville, tn 37932 phone. We are one who involved in the testing and commissioning of power systems and testing laboratory for carrying out condition monitoring tests on power equipments, precommissioning tests and commissioning of power generating stations, captive power plants, ehv sub stations upto 400kv, ht and lt installation and dg sets testing, generators, ht motors, bushings,ht cables.
Transformer oil and other insulating liquids suffer from electrical and mechanical stresses while a transformer is in operation. Transformer testing allows this aging process to be quantified and tracked, to help predict replacement intervals and avoid failures. Sdmyers has the largest transformer oil testing lab in the world, with packages that test for every known fault condition. Diagnostic testing and monitoring will help you to determine your assets condition and choose the right corrective measures to ensure reliable operation and extend the transformers life expectancy. Prior to testing, short the primary winding of the ct under test by connecting h1 and h2, then short the secondary winding of the ct under test by connecting x1 and x2x5.
Acts as a heat transfer medium to carry out heat generated within the transformer windings. Power transformer services doble engineering company. Ac dielectric withstand test voltage shall not exceed 65 percent of factory test voltage for oneminute duration. Providing advanced testing, root cause analysis and other assessment services by working with doble, we can get a lot of expertise without having to worry about five or six different companies. In addition there are contaminations caused due to chemical interactions with windings and other solid insulations, catalyzed by high operating temperature. To remain competitive in todays economy, your organization needs reliable, lowcost and uninterrupted power. Our engineers have completed substation testing and maintenance including power transformers, switchgear from 600 v to 35 kv, overhead and industrial switches, reclosers, relays, breakers and regulators for over 20 different utilities and industrial customers. This course uses uptodate test equipment and procedures for evaluating the condition of a. Aug, 2015 a transformer is a static electrical device that transfers energy between its connected circuits by inductive coupling. Since 1965, sdmyers has pioneered transformer management. Coil design and rewinding, reconditioning, oil analysis, and more available. Transformer testing commissioning, routine, diagnostic.
Remove the neutral ground and isolate the ct from any associated burden. Substations and switchgear in an electrical system perform the functions of voltage transformation, system protection, power factor correction metering, and circuit switching. Inspection, testing and commissioning of electrical. If the reading is above the amperage rating for the transformer, the circuit is drawing too much power. With our proprietary pcbx process, we are the only company in the united states with the epa. Aet also performs bushing replacement, ltc repairs and oil processing. 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. Aet provides field engineering, assembly, vacuum filling, acceptance testing and commissioning. It evolved from the simple gonogo verdict into a sophisticated segment within transformer manufacturing. Electrical power aparatus, such as transformers, regulators.
Students learn instruction to install, maintain, repair or troubleshoot power transformers rated 765 kv or less. Substation, switchgear and equipment maintenance and testing. Mlgw began to test each of its transformers for furans in 2009. All of these factors affect the amount of testing necessary to certify that a transformer is ready to be energized and placed in service. Historical test data is valuable for determining damage to the transformer after a fault or failure has occurred elsewhere in the circuit. The latest sfra test sets make these techniques more accessible, more convenient and.
In this book we have laid down important aspects on transformer. By using the latest proven sfra test techniques, it is possible to accurately assess transformer condition without dismantling it. Purpose this document is to provide guidance to bureau of reclamation reclamation powerplant personnel in maintenance, diagnostics, and testing of transformers and associated. The primary injection testing is the only way to prove correct installation and operation of the whole protection chain, as involves testing the entire circuit. Transformer oil testing is a proven loss prevention technique that should be a part of any condition based predictive maintenance program. Commission testing provides baseline data for maintenance critical for utility installations subject to nerc prc005. The power transformer testing fat test is performed after completion of the assembly at the manufacturing shop. All materials and relevant documentation to this testing works shall be checked by the responsible personnel prior to the commencement of testing activities. The amperage rating for your transformer fuse may be labeled on the transformer, but will also be. Some transformer tests are carried out for confirming the basic design expectation of that transformer. Sdmyers can help you achieve that with a range of services and products designed. This will prevent inaccurate readings and ensure your own safety. Power substation services transformer maintenance services. Our services range from routine inspection, testing and maintenance to a full turnkey replacement of a large power transformer.
Oil analysis services fluid analysis, laboratory trico corp. A transformer is a static electrical device that transfers energy between its connected circuits by inductive coupling. The main high voltage tests are included in type and routine tests made by the manufacturer in the factory to meet the required standards, quality and reliability. Sfra testing on transformers dismantling a power transformer to determine its condition is hardly ever a practical possibility. The bushing current transformers cts are tested by power transformer manufacturers during the final acceptance test, whereas substation. Alfa transformer offers complete repair and testing services for dry type and oil filled transformers up to 5000 kva. Various influences can impact the expected lifetime throughout a transformers lifecycle. Participants will receive instruction on the filtering and drying out process to be performed on transformers. We specialize in commissioning, start up, and maintenance testing for utility, industrial, transit, data centers, and commercial facilities. Compared with the cost of premature or catastrophic failure, regularly scheduled oil testing is a costeffective and. A schematic drawing of a singlephase distribution transformer appears in fig. There are a multitude of checks and tests performed as a transformer is being assembled at a substation. Measurement of the harmonics of the noload current. A 40yearold transformer showed a degree of polymerization of 260 in early 2010 during testing, with estimated remaining life at 19 percent.
Get transformer testing anywhere with mobile diagnostic technicians. Transformers are also used in electronic products to stepdown the voltage supply to a level suitable. Power substation services is the nations leader in the installation and servicing of substation transformers. Put your ohmmeter on its lowest scale and after removing the plastic sheaths from the conductors, touch its leads together to verify that it is ready for testing. Measurement of zerosequence impedance of threephase transformers. With more than 300 hours each of specialized transformer training and a focus on accuracy, safety, and care, our mdts work hard to gather the information we need to keep your electrical system running. If a proactive approach is adopted based on the condition of the transformer oil, the life of the transformer can be extended. Routine testing of transformer oils and insulating oils on a regular schedule is an accepted industry. The reliability and efficiency of the transformer has a major impact on the total cost of transmission over a long period of time. Oil testing capabilities doble engineering company. Industrial tests consulting engineering group leverages the resources of industrial tests extensive library and diverse team of experienced engineers in or call 19166328378.
Today, many companies are increasingly looking to outsource for answers to their toughest engineering problems. Portable ct pt analyzertransformer testgfuve electronics. In this paper, the different types of transformer testing are mentioned. 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. Basics, maintenance, and diagnostics xi contents continued page 9. 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. The rest of the time the cutout has operated for a non transformer. Power transformers built for reliability and efficiency. Powertech services provide commissioning, baseline, time, and condition based testing services including. That gives us an advantage in terms of cost and knowing that the reports we receive come with doble. The transformer oil market comprises several stakeholders, such as technicians and repair personnel, companies in the transformer industry, companies in the switchgear industry, reactor manufacturing companies, government and research organizations, investment banks, thirdparty testing companies, medical equipment manufacturing companies, and. High voltage testing is usually performed to qualify the device to operate safely during rated electrical conditions, a way to check the effectiveness of its.
Transformers are mainly used to increase voltage before transmitting electrical energy over long distances through wires. Diagnostic testing and monitoring of power transformers. Substations equipment maintenance testing electric. Historic flooding has affected thousands of homes and businesses. Neta accredited companies ansineta ats2009 magna iv engineering, ltd. Highlevel field testing power factor, winding resistance, sweep frequency response. Standard for acceptance testing specifications for electrical. If no evidence of distress or insulation failure is observed by the. A power transformer is a technology investment that needs to be secured for decades. A transformer is a device used to change the voltage levels of electricity to facilitate the. Alfa transformer transformer repair, dry type transformers. The transformer was immediately taken offline and internally inspected to identify any.
Section 7 of the ansineta standard for acceptance testing specifications for electrical power equipment and systems may be reproduced and used on a cut and paste basis for the particular type of equipment to be tested. To test a transformer, however, you will need to disconnect it from the circuit before doing anything else. How to use an ohmmeter to test an ac transformer sciencing. In addition some other tests are also carried out by the consumer at site before commissioning and also periodically. Dc dielectric withstand test voltage shall not exceed 100 percent of the ac rms test voltage specified in ansi c57. Being an eminent name of the industry, we are engaged in offering of our clients a most reliable and desired range of power transformer testing services. Our expert crews travel across the country to provide oil and electrical testing services, as well as transformer maintenance and repair. There are various test required on transformer to conform performance of transformer. About 20% of the time when the cutout operates the transformer has failed. Peace of mind are delivered with neta electrical testing that determines the fitness of your new electrical system. To prove that the transformer meets customers specifications and design expectations, the transformer has to go through different testing procedures in manufacturer premises.
Transerect testing and commissioning engineers testing. Transformer protection test values derived based on the transformer winding connections and sc program. A primary part of commissioning a transformer involves testing it after its installation in the field. To meet this high level of quality our lab is iso 9001. Industrial tests consulting engineering group leverages the resources of industrial tests extensive library and diverse team of experienced engineers in or. Hydroelectric research and technical services group. Trico is committed to providing quality oil analysis services. High voltage testing solutions high voltage testing of electrical equipment covers a wide range of techniques depending on the nature of the equipment and the type of test required. The electrical testing company offering electrical testing services, including field testing, uninterruptible power supply services, and electrical engineering services for industries, the electrical testing company is the perfect guide to providing you with prompt resolutions and preemptive measures. The singlephase distribution transformer consists of a primary winding and a secondary winding wound on a laminated steel core. This course uses uptodate test equipment and procedures for evaluating the condition of a transformer. As a result of the owner company, the importance of the machine and the outage possibilities, it is necessary to. The core of a transformer is made of iron whereas thewinding which is wrapped over.
Pdf transformer is a static device which transforms a. Measurement of the power taken by the fans and oil pumps. Standard for acceptance testing specifications for. Back to the basics current transformer testing ct as test equipment becomes more sophisticated with better features and accuracy, we risk turning our field personnel into test set operators instead of skilled field service technicians. The most effective preventive programs are oil sampling and testing, electrical testing and visual inspection. In a shelltype shell form transformer, the steel magnetic circuit core forms a shell surrounding the windings. List of power transformer manufacturers in india buy.
Offered by our qualified and adroit professionals, latest, advanced testing equipment these services are highly acknowledged by the clients spread across the nation. 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. The basic principle of operation of a transformer is explained in chap. Regular sampling and testing of insulation oil taken from transformers is a valuable technique in a preventative maintenance pr ogram. Losses of transformersthe transformers are made of 2 types of materials. Commission testing methods for protection systems mipsycon. The following sections of the ansineta standard for acceptance testing specifications for. Trust our highly trained mobile diagnostic technicians to take clean samples and perform detailed inspections of your equipment.
Follow instructions in the transformer manual carefully. So, testing the transformer is pretty serious issue. We are focused on maximizing the costeffective, reliable life of your high voltage equipment. Transformer is one of the important equipment in power system. This amounts to a rigorous examination of the transformer intended to. This early warning system can allow management to identify maintenance priorities, plan work assignment schedules, and order necessary parts and materials. These tests are done mainly in a prototype unit not in all manufactured units in a lot. Testing of power transformers seems like a similar experience. Test this by hooking up the secondary to its circuit and using your dmm to test the secondary lines.
For confirming the specifications and performances of an electrical power transformer it has to go through numbers of testing procedures. Transformer oil testing and analysis is a costeffective preventive maintenance tool for your electrical power system. Transformer testing has developed considerably over the past years. C electrical power from one voltage to another voltage keeping the frequency same by.
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