The system is intended to acquire various parameters from the fieldtesting instruments on real time. The sound generated by a transformer is affected by the core geometry, flux density, tank design, and the quality of assembly of all the transformer components into a completed unit. Testing of power transformers seems like a similar experience. For confirming the specifications and performances of an electrical power transformer it has to go through numbers of testing procedures. Ppt transformer tests powerpoint presentation free to. Before proceding with transformer measurements the test engineer will become familiar with the safety rules of section 2. Various influences can impact the expected lifetime. Abbs latest development, the trafositetesting mobile test unit is a mobile highvoltage test system for onsite testing of power transformers. Losses of transformersthe transformers are made of 2 types of materials. Twowinding transformers have terminals designated by h and x e. During commissioning and operation it is essential that your power transformer is in good condition. A transformer bank composed of three singlephase units may be replaced by one 3phase transformer the magnetic core has three fluxcarrying legs two yokes, bottom and top, couple the flux of the three legs the sum of the three fluxes equals zero each leg contains the primary and secondary windings of one of the phases.
Portable ct pt analyzertransformer testgfuve electronics. In 2005, this document was approved for the first time as an american national standard. Where the test procedure is not specified, the requirements of iec 60076 apply. In 2003, abb compiled all its knowledge in a book titled testing of power transformers. If you catch a fault condition early, there are corrective actions you can take to prevent further damage to the transformer and avoid costly downtime from catastrophic failure. Transformer testing has developed considerably over the past years.
As it checks the quality of material used and the procedure of transformer manufacturing hence provide us details of life of transformer, the transformer behaviour on different faults. Instrument transformer theory and testing steve hudson, pe engineering manager 10737 lexington drive knoxville, tn 37932 phone. A wellmaintained transformer can last more than 50 years. A presentation ontransformer testing using dpatt3bi 2. Power transformer iec 60670 power transformer power transformer testing and commissioning pdf modern power transformer practice pdf modern power transformer practice paperback design operation maintenance of core type. Distribution transformer testing power partners usa. Power transformer testing procedures and schemes eep. Apparatus and method for testing shortcircuited power transformers. Basics, maintenance, and diagnostics xi contents continued page 9. Download the seminar report for testing of transformer. Transformer oil testing is a proven loss prevention technique which should be a part of any condition based predictive maintenance program.
The types of tests and the procedures for conducting them have been defined by the ieee transformers committee. Power transformer testing transformers may be tested using ac or dc voltage. A free powerpoint ppt presentation displayed as a flash slide show on id. Us3742346a surge generator for transformer testing. The following tests are routinely conducted in the field on the transformer. The quality of a transformer is of utmost importance for safety, industrial and financial reasons. To prove that the transformer meets customers specifications and design expectations, the transformer has to go through different testing procedures in manufacturer premises. The standard for maintenance testing specifications for electrical power equipment and. In this book we have laid down important aspects on transformer. Some transformer tests are carried out for confirming the basic design expectation of that transformer.
Megger offers the broadest range of transformer test equipment in the industry, capable of delivering the most comprehensive picture of transformer health. A primary part of commissioning a transformer involves testing it after its installation in the field. Download pdf field testing at virginia and georgia transformer corp, you will enjoy a level of service that will make you appreciate your decision to purchase our products. H 1, h 2, x 1, x 2, where h is the higher voltagerated winding and x is the lower voltage winding. William morse a free powerpoint ppt presentation displayed as a flash slide show on id. The type and routine test are very important for transformer. Megger offers the broadest range of transformer test equipment in the industry, capable of delivering the most comprehensive picture of. Following is an approximate sequence for transformer testing. Terminal marking of power transformers is determined by ansi standards. The first neta maintenance testing specifications for electrical power equipment and systems was published in 1975. Pdf transformer is a static device which transforms a. As power transformer is highly expensive as well as important part of distribution system.
Distribution transformers 11 kv230 v and 11 kv central. Since 1989, revised editions of the maintenance testing specifications have been published in 1993, 1997, and 2001. 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. Download pdf transformer testing equipment catalogue there are several facets to a transformers overall health, so a full assessment requires a number of tests.
The core of a transformer is made of iron whereas thewinding which is wrapped over the iron core is made up ofcopper. Routine tests and type tests of transformers electrical4u. A capacitor, which has been charged to a predetermined voltage, is connected in parallel with an inductor. The test and assessment of transformers is a complicated task. Morgan tm schaffer transformers the inside view transformer tests oil tests and online monitoring can increase transformer life expectancy by. Worldwide, it is the first 3phase system based on a static frequency converter which is especially designed for performing routine and special tests for power transformers. When the voltage of the discharging capacitor goes through zero, the shorted transformer being tested is connected across the inductor. Standard for acceptance testing specifications for electrical. Standard for acceptance testing specifications for. In this paper, the different types of transformer testing are mentioned.
Transformer is one of the important equipment in power system. This ms excel spreadsheet is actually detailed instruction for each procedure necessary for correct testing of power transformer. Gf106tportable ct pt analyzer639km related products. Making a wellinformed choice in equipment for transformer testing is an important step towards ultimately improving transformer life management decisions. May 10, 20 the transformer testing performed before commissioning the transformer at the site is called the precommissioning test of transformer. So, testing the transformer is pretty serious issue. These tests are done to assess the condition of transformer after installation and compare the test results of all the low voltage tests with the factory test reports. The core of a transformer is made of iron whereas thewinding which is wrapped over the ir. Introduction transformer testing has evolved over the years to help determine the electrical, thermal, and mechanical suitability of transformers for operation on modern electrical systems. Testing procedures for power transformer ms excel spreadsheet. Power transformer iec 60670 power transformer power transformer testing and commissioning pdf modern power transformer practice pdf modern power transformer practice paperback design operation maintenance of core type oil filled power transformer transformer transformer applications transformer protection pdf mind transformer transformer.
Portable precision current transformer testing ct pt analyzer. These tests are done mainly in a prototype unit not in all manufactured units. 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. It evolved from the simple gonogo verdict into a sophisticated segment within transformer manufacturing. C electrical power from one voltage to another voltage. Power transformer maintenance and acceptance testing, by.
The power transformer testing fat test is performed after completion of the assembly at the manufacturing shop. Ac voltage is preferable to dc voltage for transformer testing because ac voltage simulates the internal stress that the transformers face during operating conditions. Transformer testing software is used for testing of singlephase or three phase transformers. The following sections of the ansineta standard for acceptance testing specifications for. This test usually known as no load test and involves inserting an alternating voltage in the high voltage winding of the transformer in each of its phases with low. There are several facets to a transformers overall health, so a full assessment requires a number of tests. Testing and diagnostics of power transformers brochure 4.
Transformer testing carried out in accordance with applicable iec and ansi specifications, unless otherwise specified in the contract documents. This amounts to a rigorous examination of the transformer intended to. Unit 14 transformers objectives after studying this unit, the student will be able to state the purpose of a transformer. Free download of power transformer maintenance and acceptance testing by department of the army. Power transformer testing procedures and schemes photo credit. Standard for testing specifications electrical power. Best practices for transformer testing and maintenance. The preference is that all large power transformers 1 mva be tested with ttr test set. Inspect transformer and parts for shipping damage and moisture. A matching transformer may be used between the transformer. Sound testing ansi standards define the required sound levels for transformer but some customers specify reduced sound levels. Note for the purpose of this part any insulating liquid, mineral oil or other product, is regarded as oil. Transformer testing commissioning, routine, diagnostic.
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