The powersystems policy for electrical testing of company equipment, outlined. 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. We present this manual which objective is to aid you for understanding our organization and the tests service. Industrial tests, inc 4021 alvis court suite 1 rocklin, ca 95677. For confirming the specifications and performances of an electrical power transformer it has to go through numbers of testing procedures.
In every residence, malls, industry, everywhere energy meters are used to measure. 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. The automatically generated report of the transformer oil testing sequence is available as a pdf version and is stored to the internal memory. Our services range from routine inspection, testing and maintenance to a full turnkey replacement of a large power transformer. The knopp current transformer testing system type kcts8000 is designed to measure the accuracy of instrument transformers having 1 or 5 ampere secondaries and primaries of up to 8000 amperes.
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. Trust our highly trained mobile diagnostic technicians to take clean samples and perform detailed inspections of your equipment. Portable ct pt analyzertransformer testgfuve electronics. So, testing the transformer is pretty serious issue.
Transformer oil testing is a proven loss prevention technique which should be a part of any condition based predictive maintenance program. Transformer is one of the important equipment in power system. Standard for acceptance testing specifications for. Power substation services transformer maintenance services. To perform all these test now a latest technique is used sfc static frequency converter instead of mg set because of there low loss, low power requirement. Transformer insulation evaluation unit the transformers testing equipment etp2 is a unit that automatically performs measurements in all type of power, distribution, or instrument transformers. 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. Pole mounted and secondary ground mounted transformers. It evolved from the simple gonogo verdict into a sophisticated segment within transformer manufacturing. In this paper testing of distribution transformer is considered. Distribution transformers 11 kv230 v and 11 kv central. Applicable to tata power operating and project sites which cover but not limited to plant premises, switchyards, substations, offices. Manufacturers test thousands of distribution transformers at worldwide locations each week.
Losses of transformersthe transformers are made of 2 types of materials. Transformer oil testing and analysis is a costeffective preventive maintenance tool for your electrical power system. Voltage transformer testing swp page 3 of 19 standard work practice sp0508 ver 7 ergon energy corporation limited abn 50 087 646 062 if any risks cannot be managed or reduced to an acceptable level, do not proceed with the task and seek assistance from your supervisor. Electrical insulation testing of hv equipment up to 33kv. Power transformer services doble engineering company. We offer test sets for power transformer condition diagnosis, commissioning and acceptance testing to ensure reliable. With our proprietary pcbx process, we are the only company in the united states with the epa.
Transformers, motors and generators test equipment. Identifying and resolving problems starts with performing electrical testing, maintenance, and engineering services provided by vertiv. All materials and relevant documentation to this testing works shall be checked by the responsible personnel prior to the commencement of testing activities. It is carried out as a type test as well as routine test.
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. Along with this the transformer oil testing is also highly important. Such a failure could result from a new operator in the winding department the hipot test a versatile test. Pdf transformer is a static device which transforms a. The test and assessment of transformers is a complicated task. These tests are done mainly in a prototype unit not in all manufactured units in a lot. Instrument transformer testing instrument transformers for metering purposes must have a high degree of accuracy up to class 0. A presentation ontransformer testing using dpatt3bi 2.
Transformer clinic specialists conduct dga and oil quality tests of. This ms excel spreadsheet is actually detailed instruction for each procedure necessary for correct testing of power transformer. Transformer diagnostic testing performing winding resistance and turns ratio tests vanguard instruments company, inc. Acts as a heat transfer medium to carry out heat generated within the transformer windings. Making a wellinformed choice in equipment for transformer testing is an important step towards ultimately improving transformer life management decisions. To prove that the transformer meets customers specifications and design expectations, the transformer has to go through different testing procedures in manufacturer premises. Specific transformer oil test method availability will vary depending upon location. Instrument transformer theory and testing steve hudson, pe engineering manager 10737 lexington drive knoxville, tn 37932 phone. Aet provides field engineering, assembly, vacuum filling, acceptance testing and commissioning. Testing is typically done with a megohmmeter, a tool similar to a multimeter but with a much higher capacity. Transformer oil testing quick, simple and onsite b2hv. Hence it become important to test them before using it. Testing and diagnostics of power transformers brochure.
Frequency response analysis often referred to as fra or sfra is a powerful and sensitive method for testing the mechanical integrity of transformer cores, windings, and press frames, in power transformers. Bluetooth connection as means of communication with the instruments a usb flash drive interface and a bluetooth connection is offered. A transformer is a device used to change the voltage levels of electricity to facilitate the. Every electrical network has a unique frequency response its socalled fingerprint. Transformer oil test methods include astm, bs,and other recognized transformer oil analysis testing procedures. This early warning system can allow management to identify maintenance priorities, plan work assignment schedules, and order necessary parts and materials. Current transformer testing system tesco the eastern. C electrical power from one voltage to another voltage keeping the frequency same by. In this paper, the different types of transformer testing are mentioned. In addition there are contaminations caused due to chemical interactions with windings and other solid insulations, catalyzed by high operating temperature. Hence, it is essential to inspect and calibrate those instrument transformers at regular intervals. Smit transformer service sts is the service department of royal smit transformers b. Hydroelectric research and technical services group. The system uses a high accuracy multirange current transformer as a reference standard.
Transformer testing has developed considerably over the past years. Commonly known as the megger test, insulation resistance testing measures the quality of insulation within the transformer. Aet also performs bushing replacement, ltc repairs and oil processing. The ecodesign directive of the european union and the related regulation 5482014 for transformer losses requires manufacturers to publish on the internet information on rated power, load loss, noload loss and weight and type of the major components of typical transformers, which are. Providing advanced testing, root cause analysis and other assessment services. Sdmyers has the largest transformer oil testing lab in the world, with packages that test for every known fault condition. Some transformer tests are carried out for confirming the basic design expectation of that transformer. This document is not part of a manual but it is published to the energy networks internet site. Testing of any electrical equipment indicates the extent to which the equipment is able to comply with a customers requirements. Transformer oil and other insulating liquids suffer from electrical and mechanical stresses while a transformer is in operation. Testing of power transformers seems like a similar experience.
Our expert crews travel across the country to provide oil and electrical testing services, as well as transformer maintenance and repair. We cannot think of life without electricity and when there is electricity consumption there is a need to measure its consumption. Some variations in testing results in natural, depending on the moisture, cleanliness and the temperature of the insulation, but to pass, the insulation must. To ensure that the product is fit for its intended use standards iec standards iec 60076 part 1 part 14 specification for transformers ieee. As a result of the owner company, the importance of the machine and the outage possibilities, it is necessary to.
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. Power substation services is the nations leader in the installation and servicing of substation transformers. Testing of current transformers, voltage transformers or auxiliary transformers. Follow instructions in the transformer manual carefully. Serves as electrical insulation to withstand the high voltages inside the transformer. Routine testing of transformer oils and insulating oils on a regular schedule is an accepted industry. The core of a transformer is made of iron whereas thewinding which is wrapped over. Manufacturers need to be certain their units are meeting the desired specifications, while end users need to perform regular maintenance procedures to detect minor fault symptoms before timely and costly failures occur. The power transformer testing fat test is performed after completion of the assembly at the manufacturing shop. The following sections of the ansineta standard for acceptance testing specifications for. The windings are shorted and the test voltage is applied to one winding while the. In this book we have laid down important aspects on transformer. Ergon energy corporation limited abn 50 087 646 062.
Transformer oil testing is a proven loss prevention technique that should be a part of any condition based predictive maintenance program. Power transformer testing condition assessment omicron. Transformer clinics observe overnight baseline testing services place your. If expensive assets reach their end of life point sooner than expected, it is important to figure out why. 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. Basics, maintenance, and diagnostics xi contents continued page 9. The objective of testing is to ensure quality to ensure that the products manufactured have met the requirements of customer specificationstandard to prevent accidents which may occur if a failed product is put into service. Testing of power transformers is important for the manufacturers and end users. Some of the process failures that can be detected by a productionline hipot test include, a transformer wound in such a way that creepage and clearance have been reduced. All work to be done with voltage transformer deenergised. The established documentation for the elimination and control of hazards is henceforth referred to as electrical safety procedure.
There are several facets to a transformers overall health, so a full assessment requires a number of tests. The test laboratory of asea brown boveri has a quality system acredited by enac national company of. Megger offers the broadest range of transformer test equipment in the industry, capable of delivering the most comprehensive picture of transformer health. Frequency response analysis on power transformers omicron. A major north american generation company, invested in a longterm transformer replacement project, awarded doble a multiyear contract for transformer consulting services including.
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