Transformers, electrical engineering multiple choice questions objective type questions, mcqs, with question and answers, download free pdf, electrical engineering, multiple choice questions, objective type questions, electrical engineering short notes, rapid fire notes, best theory. Oc and sc tests sumpners test predetermination of efficiency and regulationseparation of losses testparallel operation with equal and unequal voltage ratios auto transformersequivalent circuit. Sumpner s test provides data for finding the regulation, efficiency and heating under load conditions and is employed only when two similar transformers are available. C test, sumpner or back to back test, condition for. To conduct sumpners test on two identical singlephase transformers and to determine its efficiency and regulation characteristics. Reflecting new technologies and the latest practices in the field, electrical transformers and rotating machines, 3e combines a current, comprehensive explanation of theory with practical applications of. Sumpners test or backtoback test on transformer electricaleasy. Parallel operation of two dissimilar singlephase transformers of different kva and determination of load sharing and analytical verification given the short circuit test data. The advantage of conducting this test is very economical of power, even when the transformers are tested at full load conditions. Chapter 2 d c motors 42 to read, highlight, and take notes, across web, tablet, and phone. Ee6401 electrical machinesi previous year question papers. Introduction the sumpners test back to back test is the very practical, convenient, efficient and minimum power consumption test which is done without actual loading to find regulation and efficiency of large power.
Sumpners test provides data for finding the regulation, efficiency and heating under load conditions and is employed only when two similar transformers are available. Ee6401 electrical machinesi previous year question papers february 27, 2018 may 24, 2019 syed afrith b. We connect ac supply at primary side of transformers. This test is called, backtoback test, regenerative test or sumpners test. Both transformers are connected to supply in such a way that one transformer is loaded on another. Sumpners test give more accurate results of regulation and efficiency than o. Jul 18, 2015 so,one transformer is loaded on the other in sumpner s test.
Polarity test of a singlephase transformer electrical. Electrical machines, 2nd edition book oreilly media. Which of the following is not a routine test on transformers. Sumpner s test give more accurate results of regulation.
Sumpner s test or back to back test on transformer is another method for determining transformer efficiency, voltage regulation and heating under loaded conditions. Sumpners test or back to back test on transformer is another method for determining transformer efficiency, voltage regulation and heating under loaded conditions. One of our esteemed professor details about sumpners test experiment for the students of electrical and electronics engineering department. The third edition also includes an allnew instructor resource cd with powerpoints, image library and examviewtm test bank generator. Transformer objective questions and answers pdf free set 10. This test can also be used to determine the efficiency of a transformer. E electrical and electronics engineering, second year 4th semester ee6401 electrical machinesi previous year question papers for the regulation 20. Sumpners test or back to back test requires two transformers. The sumpner test is carried out on two identical transformers to compute the efficiency of each transformer. Transformer is a static device, which is used to convert ac electricity from one voltage to another without any change in frequency. Solved disadvantages of sumpners test disadvantages of.
The sumpners test is another method of determining efficiency, regulation and heating under load conditions. Sumpners test also known as sumpner test, backtoback test or load test 2 a type of test of transformer, which allows simulation of full load conditions and hence also thermal testing, without the need for full rated load sumpners test is used for large transformers, for which ordinary fullload tests are too expensive from the viewpoint of electrical energy consumption and. Sumpners test or back to back test on transformer is another method for determining transformer efficiency, voltage regulation and heating under. Testing of single phase transformer and auto transformer. This test gives the value of total loss accurately as it occurs when it is in actual use. Download link is provided and students can download the anna university ee6401 electrical machines i em i syllabus question bank lecture notes syllabus part a 2 marks with answers part b 16 marks question bank with answer, all the materials are listed below for the students to make use of it and score good maximum marks with our study materials.
Sumpner s test is conducted on transformers to determine a temperature. The power required to test a large machine is small. Sumpners test use in identical transformer for, to find the sumpners test back to back test is the very practical, convenient, efficient and minimum power consumption without actual loading heat run temp. Short circuit and open circuit tests on transformer can give us parameters of equivalent circuit of transformer, but they can not help us in finding the heating information. Several key features in each unit make this an excellent teaching tool. May 24, 2019 ee6401 electrical machinesi previous year question papers february 27, 2018 may 24, 2019 syed afrith b. Oc and sc tests sumpners test predetermination of efficiency and regulationseparation of losses testparallel operation with equal and unequal voltage ratios auto transformersequivalent circuit comparison with two winding transformers. The maximum temperature rise in a large transformer is determined by the full load test. Sumpner or backtoback test sumpners test or back to back test on transformer is another method for determining transformer efficiency, voltage regulation and heating under loaded conditions. And one more low voltage supply is connected in series with secondaries to get the readings, as shown in the circuit diagram shown below. Pdf electrical transformers and rotating machines download. Emslabmanual slideshare feb 09, 2014 separation of iron losses in dc machine hopkinson s test sumpner s test on single phase transformer transcript of emslabmanual 1. Jun 24, 2019 gy transformersconstruction, polarity test, sumpners test, all day efficiency. Index to other editions view all electrical machines v.
Sumpners test is conducted on transformers to determine a temperature. Mar 09, 2017 the sumpner test is carried out on two identical transformers to compute the efficiency of each transformer. Backtoback test sumpners test on transformer definition. Sumpners test of transformers presented by girin chutia assam engineering college 2. Short circuit and open circuit tests on transformer can give us. To perform open circuit and short circuit test on a single phase transformer and to predetermine the. The sumpner s test requires two identical transformers. With its unique combination of transformers and motors, electrical transformers and rotating machines, 3e is an excellent resource for electrical students and practitioners alike. Jun 30, 2017 it explains polarity test in the transformer. Apr 02, 2016 sumpner or backtoback test sumpners test or back to back test on transformer is another method for determining transformer efficiency, voltage regulation and heating under loaded conditions. Sumpner test or back to back test on transformer this test is conducted instantaneously on two similar transformers and so the transformers temperature rise, efficiency and voltage regulations. Sumpners test on a pair of single phase transformers free download as.
Otherwise, with incorrect polarity, it is not possible to connect them in parallel. The sumpners test requires two identical transformers. Sumpners test is used to put large transformer on full load. Pdf laboratory manual of electrical machines ii mukesh. The full load test on a small transformer is very convenient, but on the large transformer, it is very difficult. With its unique combination of transformers and motors, electrical transformers and rotating machines, 3e is an excellent resource. The main advantages of the swinburnes test are as follows. Losses and efficiency in dc machines and transformers condition for maximum efficiency testing of dc machines brake test, swinburne s test, retardation test and hopkinson s test testing of transformers polarity test, load test, phasing out test sumpner s test separation of losses. Sumpners test electrical engineering interview questions. Concept of coupled circuits, dot convention, writing network equilibrium equations in coupled circuits problems on coupled circuits excluded, principle of transformer action for voltage transformation, constructional details of shell type and core type singlephase and threephase transformers, description of the following types of transformers power transformer. Open circuit and short circuit tests on single phase transformer.
Ac equivalent circuits capacitors behave as shortcircuits to ac signals, so in the ac equivalent circuit for a transistor circuit all capacitors must be replaced with shortcircuits. Sumpners test on similar transformers and determination of combined and individual transformer efficiency. Electrical machines 2 pdf notes em 2 pdf notes smartzworld. Download pdf electronic transformers and circuits free. This test is necessary for parallel operation of transformers and sumpners test. Objects of testing transformers, polarity test, sumpners test. Thus, this method is an economical and convenient method of testing of dc machines. Polarity test of a singlephase transformer polarity testing of transformers is vital before connecting them in parallel. Transformers and motors download ebook pdf, epub, tuebl, mobi. The figure above shows that the connection diagram of back to back test on two similar transformers named t1 and t2.
Scheme of instruction and syllabi of university college of. Open circuit oc or noload test the purpose of this test is to determine the. What is backtoback test sumpners test on transformer. As the constant loss is known the efficiency can be predetermined at any load. Sumpners test on a pair of single phase transformers scribd. Sumpnerss test on a pair of single phase transformer 1722 3. Losses and efficiency in dc machines and transformers condition for maximum efficiency testing of dc machines brake test, swinburne s test, retardation test and hopkinson s test testing of transformers polarity test, load test, phasing out test sumpner s test separation of losses all day efficiency. Understanding ac circuits covers the second half of a basic electronic circuits theory course, integrating theory and laboratory practice into a single text.
These two tests on a transformer helps to find determine. Swinburnes test and speed control of dc shunt motor. Here, two identical transformers are connected back to back, such that their primaries are in parallel across the same voltage source and. Sumpners test use in identical transformer for, to find the sumpner s test back to back test is the very practical, convenient, efficient and minimum power consumption without actual loading heat run temp. This test is also known as back to back test or load test. Sumpners test give more accurate results of regulation. Transformers, electrical engineering multiple choice questions objective type questions, mcq s, with question and answers, download free pdf, electrical engineering, multiple choice questions, objective type questions, electrical engineering short notes, rapid fire notes, best theory. The primary will draw a small current i 0 to supply the iron losses and a very small amount of copper loss in primary, hence the primary no load current i 0 lags v 1 by an angle o 0 less than 900 and no load input power w 0 v 1 i 0. Electrical diagram of a sumpner s test for singlephase transformers 1 by s.
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