This test can also be used to determine the efficiency of a transformer. Electrical diagram of a sumpner s test for singlephase transformers 1 by s. Polarity test of a singlephase transformer electrical. Electrical machines 2 pdf notes em 2 pdf notes smartzworld. 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. 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. 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.
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. Parallel operation of two dissimilar singlephase transformers of different kva and determination of load sharing and analytical verification given the short circuit test data. 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. Sumpners test on similar transformers and determination of combined and individual transformer efficiency. Transformers and motors download ebook pdf, epub, tuebl, mobi.
May 24, 2019 ee6401 electrical machinesi previous year question papers february 27, 2018 may 24, 2019 syed afrith b. Ee6401 electrical machinesi previous year question papers. Sumpners test provides data for finding the regulation, efficiency and heating under load conditions and is employed only when two similar transformers are available. What is backtoback test sumpners test on transformer. 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. To conduct sumpners test on two identical singlephase transformers and to determine its efficiency and regulation characteristics. And one more low voltage supply is connected in series with secondaries to get the readings, as shown in the circuit diagram shown below. The sumpner s test is another method of determining efficiency, regulation and heating under load conditions. We connect ac supply at primary side of transformers. Electrical machines, 2nd edition book oreilly media. The main advantages of the swinburnes test are as follows. The maximum temperature rise in a large transformer is determined by the full load test. Sumpner s test is conducted on transformers to determine a temperature. Chapter 2 d c motors 42 to read, highlight, and take notes, across web, tablet, and phone.
With its unique combination of transformers and motors, electrical transformers and rotating machines, 3e is an excellent resource. 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 is conducted on transformers to determine a temperature. Open circuit oc or noload test the purpose of this test is to determine the. With its unique combination of transformers and motors, electrical transformers and rotating machines, 3e is an excellent resource for electrical students and practitioners alike. 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.
Objects of testing transformers, polarity test, sumpners test. Open circuit and short circuit tests on single phase transformer. Sumpner s test or back to back test on transformer is another method for determining transformer efficiency, voltage regulation and heating under loaded conditions. Here, two identical transformers are connected back to back, such that their primaries are in parallel across the same voltage source and. Solved disadvantages of sumpners test disadvantages of. Jul 18, 2015 so,one transformer is loaded on the other in sumpner s test. Transformer is a static device, which is used to convert ac electricity from one voltage to another without any change in frequency. The advantage of conducting this test is very economical of power, even when the transformers are tested at full load conditions. Ee6401 electrical machinesi previous year question papers february 27, 2018 may 24, 2019 syed afrith b. Sumpners test or back to back test on transformer is another method for determining transformer efficiency, voltage regulation and heating under loaded conditions. The sumpner s test requires two identical transformers.
To perform open circuit and short circuit test on a single phase transformer and to predetermine the. Understanding ac circuits covers the second half of a basic electronic circuits theory course, integrating theory and laboratory practice into a single text. The sumpners test is another method of determining efficiency, regulation and heating under load conditions. Load test on singlephase transformer and three phase transformers. Polarity test of a singlephase transformer polarity testing of transformers is vital before connecting them in parallel. E electrical and electronics engineering, second year 4th semester ee6401 electrical machinesi previous year question papers for the regulation 20. Sumpner s test give more accurate results of regulation. Sumpners test electrical engineering interview questions. Sumpners test give more accurate results of regulation. 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. Short circuit and open circuit tests on transformer can give us.
Sumpnerss test on a pair of single phase transformer 1722 3. Load test on singlephase transformer and three phase transformer connections. Otherwise, with incorrect polarity, it is not possible to connect them in parallel. The sumpner test is carried out on two identical transformers to compute the efficiency of each transformer. No tools range quantity 1 mi ammeter 05a 1 2 mi ammeter 010a 1 3 mi voltmeter 0150v 1 4 mi voltmeter 050v 1 5 mi voltmeter 0600v 1 6 wattmeter 150v,5a,lpf 1 7 wattmeter 150v,10a.
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. Easyengineering provide you the best collections of anna university regulation 2017 semester study materials like ee8301 electrical machines i em i syllabus, books, lecture notes, part a 2 marks with answers, important part b marks questions, direct 16 mark questions, important part c 15 marks questions, local authors pdf books, question bank with answers key, anna university ee8301. 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. Noise level test in a transformer is a a special test b routine test c type test d none of the above ans. Sumpner test or back to back test on transformer my tech info. Sumpners test or backtoback test on transformer electricaleasy.
Which of the following is not a routine test on transformers. 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. Sumpners test or back to back test requires two transformers. 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. Sumpners test on a pair of single phase transformers free download as. Testing of single phase transformer and auto transformer. Jun 30, 2017 it explains polarity test in the transformer. Sumpners test or back to back test on transformer is another method for determining transformer efficiency, voltage regulation and heating under. The power required to test a large machine is small. This test gives the value of total loss accurately as it occurs when it is in actual use. 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. Sumpners test give more accurate results of regulation and efficiency than o. Sumpners test on a pair of single phase transformers scribd.
One of our esteemed professor details about sumpners test experiment for the students of electrical and electronics engineering department. Download pdf electronic transformers and circuits free. 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. Jun 24, 2019 gy transformersconstruction, polarity test, sumpners test, all day efficiency. Pdf laboratory manual of electrical machines ii mukesh. Index to other editions view all electrical machines v. This test is also known as back to back test or load test. Pdf electrical transformers and rotating machines download. 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. Sumpners test is used to put large transformer on full load.
Backtoback test sumpners test on transformer definition. 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. These two tests on a transformer helps to find determine. As the constant loss is known the efficiency can be predetermined at any load. The third edition also includes an allnew instructor resource cd with powerpoints, image library and examviewtm test bank generator. 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. This test is necessary for parallel operation of transformers and sumpners test. This test requires two identical transformers and is connected as shown in circuit diagram. Mar 09, 2017 the sumpner test is carried out on two identical transformers to compute the efficiency of each transformer. Swinburnes test and speed control of dc shunt motor. Transformer objective questions and answers pdf free set 10.
Oc and sc tests sumpners test predetermination of efficiency and regulationseparation of losses testparallel operation with equal and unequal voltage ratios auto transformersequivalent circuit. This test is called, backtoback test, regenerative test or sumpners test. Electrical diagram of a sumpners test for singlephase transformers 1 by s. So,one transformer is loaded on the other in sumpners test. 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. 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. Thus, this method is an economical and convenient method of testing of dc machines. Sumpners test of transformers presented by girin chutia assam engineering college 2.
371 500 1335 118 1632 1350 1644 1179 1505 1115 1478 606 1566 1670 965 713 387 1454 592 1605 431 608 608 696 848 1061 1536 926 412 926 753 987 372 640 762 1 392 264 1159 292 1499