Transformer testing free download as powerpoint presentation. This test is carried out to ensure the healthiness of over all insulation system of an electrical power transformer. Power transformers part 3 insulation levels, dielectric tests and external clearances in air number of amendments. Instrument transformer theory and testing steve hudson, pe engineering manager 10737 lexington drive knoxville, tn 37932 phone. The requirements apply to transformers as defined in the scope of is 2026 part 1. Europe distribution transformer market trends, share, size. The testing code and procedure for distribution transformer would be as per is. Method of test for power factor and dielectric constant of electrical insulating liquids. Ieee standard test code for dry type distribution transformers 3. High power lab, short circuit lab, research voltage test refer is development station no.
The power figure for the alternative with the highest cooling capacity is the rated power of the transformer or of an individual winding of a multiwinding transformer see 4. The booster transformer tank is usually hotdip galvanized for corrosion protection. Thermal evaluation and classification of electrical insulation is 1271 6. The liquid immersed booster transformer is designed for outdoor. Routine tests and type tests of transformers electrical4u. The details on rating plate shall be finalized during the detailed engineering. Note for the purpose of this part any insulating liquid, mineral oil or other product, is regarded as oil. The turns ratio test is performed on all taps of every winding.
Degrees of ingress protection for control gear is 12063 4. Determination of electrical strength of insulating oil. The transformer testing performed before commissioning the transformer at the site is called the precommissioning test of transformer. Power transformers transform electrical energy from one voltage level to another by stepping voitages up for transmission to minimize losses, or down for distribution. The transformer tank is hermetically sealed, corrugated and flexible, permitting liquid volume variation despite being totally filled. Insulation tests on current transformers rated 600v or less are usually performed at vdc. The power transformer testing fat test is performed after completion of the assembly at the manufacturing shop. 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. Testing of power transformers seems like a similar experience. Europe distribution transformer market value is projected to witness growth on account of ongoing inclination toward transformation of utilities and upgradation of existing grid infrastructure. Is 2026 1977 specifications for power transformers 2.
Where indian standards do not exist for such categories of transformers, this part of is 2026 may still be applicable either as a whole or in part. Jul 09, 2012 power transformers transform electrical energy from one voltage level to another by stepping voitages up for transmission to minimize losses, or down for distribution. 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. Tm 5686 power transformer maintenance and acceptance testing. Is 2026part1 specification for power transformergeneral scribd. Inspect transformer and parts for shipping damage and moisture. Is 2026 specification for power transformers iec 76 is 1180 outdoor distribution transformer up to and including 100 kva is 12444 specification for copper wire rod astm b49 is335 specification for transformer oil bs 148, d1473, d15331934 iec pub 296 is 5 specification for colors for ready mixed paints. Page 3 of 9 standard work practice sp0507 ver 5 ergon energy corporation limited abn 50 087 646 062. Technical specification for distribution transformer. Quality assurance, inspection and testing in this specification.
A presentation ontransformer testing using dpatt3bi 2. Technical specifications designengineering, manufacture. Following is an approximate sequence for transformer testing. It describes the effect of operation under various ambient temperatures and load conditions on transformer life. The transformer testing performed before commissioning the transformer at the site is called the precommissioning test of the transformer. Transformer test report free download as excel spreadsheet. Transformer is a static electrical machine which transfers ac electrical power from one circuit to the other circuit at the constant frequency, but the voltage level can be altered that means voltage can be increased or decreased according to the requirement. Before proceding with transformer measurements the test engineer will become familiar with the safety rules of section 2. Transformer rating plate shall contain the information as given in clause 15 of is2026 parti. Current transformer testing swp check this is the latest process zone version before use. The core of a transformer is made of iron whereas thewinding which is wrapped over the iron core is made up ofcopper. The power transformer covered under this specification shall comply with the requirements of the latest edition of following standards. A free powerpoint ppt presentation displayed as a flash slide show on id. Transformers etd 16 designator of legally binding document.
Ir values a for 3311 kv power transformer 2500 v megger is to be need. Basics, maintenance, and diagnostics xi contents continued page 9. Bushing for alternating voltage above v is 2099 5. May 10, 20 the transformer testing performed before commissioning the transformer at the site is called the precommissioning test of transformer. For those categories of power transformers and reactors which have their own indian standards, this part is. In this book we have laid down important aspects on transformer. Tm 5686 power transformer maintenance and acceptance. Prior to testing, short the primary winding of the ct under test by connecting h1 and h2.
Remove the neutral ground and isolate the ct from any associated burden. Transformer class limits for temperature rise 3 phase transformers upto and including 200 kva for transformer winding 40 c when measured by resistance method for top oil 35 c measured by thermometer 3 phase transformers higher than 200 kva and upto and including 2500 kva. Transformer testing has developed considerably over the past years. Separatesource voltage withstand test as per is 2026 part 3. It evolved from the simple gonogo verdict into a sophisticated segment within transformer manufacturing. Note for the purpose of this part any insulating liquid, mineral oil or other product. Is 2026 specification for power transformers iec 76 is 1180 outdoor distribution transformer up to and including 100 kva is 12444 specification for copper wire rod astm b49 is335 specification for. The two most common configurations are the delta, in which the polarity end of one winding is connected to the nonpolarity end of the next, and the star, in which all three nonpolarities or polarity ends are connected together. Power transformer turns ratio test is an ac low voltage test which determines. Power transformer turns ratio test is an ac low voltage test which determines the ratio of the high voltage winding to all other windings at noload. Where indian standards do not exist for such categories of transformers, this part of is 2026 may still be. How to perform a power transformer turns ratio test eep. Losses of transformersthe transformers are made of 2 types of materials. In addition to the above transformer testing methods, the power transformer also goes through some other tests, performed on it, before the actual commissioning of the transformer at the site.
1140 1306 1258 897 1197 393 1221 955 1087 907 735 531 641 917 1198 1188 1135 92 105 1359 86 937 260 126 968 4 509 1323 1447 100 503 273 786 155 534 491 322 335 1115 1415 820 1366 493 356 858