Understand the construction and working of ac and dc generators. Sumpners test transformers questions and answers sanfoundry. Carry out test and conduct performance experiments on dc machine and transformer. What will happen if two transformer are connected in. 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. Sumpners test provides data for finding the regulation, efficiency and heating under load conditions and is employed only when two similar transformers are available. Pdf gui based testing tool for transformer researchgate. We connect ac supply at primary side of transformers.
Pdf the objective of this paper is to develop an educational toolbox using gui. 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. Analyze the performance of transformers by polarity test, sumpners test, phase conversion, 3phase connection, and parallel operation. It provides complete learning content for both series and parallel resonance nvis 7010 scott connection demonstrator to study about conversion of three phase to two phase with proper phase displacement etc. Module1 teaching hours 10 revised blooms taxonomy level module2 10. Q6 how the secondary winding of transformers are connected for conducting the sumpners test. Sumpners test on similar transformers and determination of combined and individual transformer efficiency. This course covers the topics related to principles, performance, applications and design considerations of dc machines and transformers. And one more low voltage supply is connected in series with secondaries to get the readings, as shown in the circuit diagram shown below refer above diagram,name the two transformers as t1 and t2,and they are identical. C test, sumpner or back to back test, condition for maximum efficiency. Both transformers are connected to supply in such a way that one transformer is loaded on. Short circuit and open circuit tests on transformer can give us. Reflecting new technologies and the latest practices in the field, electrical transformers and rotating machines, 3e combines a current, comprehensive explanation of theory with.
Electrical machines 2 pdf notes em 2 pdf notes smartzworld. Sumpners test give more accurate results of regulation. Two basic tests open circuit test short circuit test test to determine the iron losscore losses. Sumpners test on similar transformers and determination of combined and individual transformer. Objects of testing transformers, polarity test, sumpners test. Here, two identical transformers are connected back to back, such that their primaries are in parallel across the same voltage source and. Equivalent circuit comparison with two winding transformers. Testing of single phase transformer and auto transformer. The sumpner test is carried out on two identical transformers to compute the efficiency of each transformer. The third edition also includes an allnew instructor resource cd with powerpoints, image library and examviewtm test bank generator. 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. Understand the construction and operation of 1phase, 3phase transformers and autotransformer.
This test gives the value of total loss accurately as it occurs when it is in actual use. Sumpners test or back to back test on transformer is another method for determining transformer efficiency, voltage regulation and heating under loaded conditions. System english chinese spanish xnli baseline translate train 73. What are the advantages of sumpners test over conventional. Engineering interview questions and answers, engineering multiple choice pdf for freshers and experienced. Both transformers are connected to supply in such a way that one transformer is loaded on another. 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 and motors download ebook pdf, epub, tuebl. Here, two identical transformers are connected back. So,one transformer is loaded on the other in sumpners test. Dc machines and transformer 2904 active learning assignment topic. Thus in the sumpners test while the transformers are not supplying any load, full ironloss occurs in their core and full copperloss occurs in their windings.
In the sumpners test while the transformers are not supplying any load, full ironloss occurs in their cores and full copperloss occurs in their windings. Download pdf electronic transformers and circuits free. Construction principle of operation equivalent circuit parameters phasor diagrams, losses testing efficiency and voltage regulationall day efficiency sumpners test, per unit representation inrush current three phase transformersconnections scott connection phasing of transformer parallel operation of. Click download or read online button to get d c machines and transformers book now. Solved why we use identical transformers for sumpners. Let us presume that both primaries are connected to a common. Sumpners test or back to back test requires two transformers. Solved disadvantages of sumpners test disadvantages. Sumpners test is conducted on transformers to study. Pdf electric machinery and transformers download full. Download electronic transformers and circuits ebook pdf or. This test gives the value of to tal loss accurately as it occurs when it is in actual use. Sumpner test or back to back test on transformer my tech.
Sumpners test is conducted on transformers to determine a temperature b stray losses c all. The maximum temperature rise in a large transformer is determined by the full load. Nvis 7011 sumpners test of single phase transformer is a very exclusive and important product designed for students of electrical engineering to explain the basic concepts of sumpners test. Electrical machines, 2nd edition book oreilly media. 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 full load test on a small transformer is very convenient, but for large transformer, it is very difficult. Oc and sc tests sumpners test predetermination of efficiency and regulationseparation of losses testparallel operation with equal and unequal voltage ratios auto transformers equivalent circuit comparison with two winding transformers. Sumpners test or backtoback test on transformer electricaleasy.
The maximum temperature rise in a large transformer is determined by the full load test. To introduce the fundamentals of dc machines and transformer. This test is called, backtoback test, regenerative test or sumpners test. Construction, connections, scott connection, vv connection, instrument transformers, current transformers and potential transformers.
Sumpners back to back testing, electrical transformers lecture 5, sumpners test, back to back test of transformer. Parallel operation of two dissimilar singlephase transformers of different kva and determination of load sharing and analytical verification given the. Oc and sc testk sumpners test predetermination of efficiency and regulationseparation of losses testparallel operation with equal and unequal voltage ratios. Sumpners back to back testing, electrical transformers. Polyphase transformers polyphase connections yy, y, y, and open text books. Brake test, swinburnes test, hopkinsons test or back to back test, retardation test or running test, fields test, applications of dc motors. The text is designed for the standard third or fourth year juniorsenior course in electrical engineering commonly called electric. When two transformer secondaries are connected at one end with opposite polarity, they are in series combination with voltage equal to addition of voltage of the two windings in series. Electrical transformers and rotating machines available for download and read online in other f. Understand the unifying principles of electromagnetic energy conversion. The sumpners test requires two identical transformers. C test, sumpner or back to back test, condition for. Specially designed tapped transformers test points provided to analysis waveforms nvis 7011 sumpners test of two single phase.
With its unique combination of transformers and motors, electrical transformers and rotating machines, 3e is an excellent resource for electrical students and practitioners alike. The heat run test could, therefore, be conducted on the two transformers, while only losses are supplied. For such purposes, square cores may be used as shown in fig. Understand working principle, performance, control and applications of dc machines and transformer. D c machines and transformers download ebook pdf, epub. The advantage of conducting this test is very economical of power, even when the transformers are tested at full load conditions. Download pdf electrical transformers and rotating machines book full free. What is backtoback test sumpners test on transformer. Sumpners test on a pair of single phase transformers aim. All types of threephase transformer connections including open delta, choice. 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. Pretraining of deep bidirectional transformers for. 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.
With this trainer, students can learn about the significance of conduction of the heat run test with two single phase transformers and. Murukesh kumar, dc machines and transformers, vikas publishing house pvt ltd. What are the advantages of sumpners test over conventional open circuit and short circuit test on transformers. The full load test on a small transformer is very convenient, but on the large transformer. Sumpners test, parallel operation, auto transformer. The full load test on a small transformer is very convenient, but on the large transformer, it is very difficult. Determine the efficiency at 14, 12, 34, full load and 1. Predetermination of performance by sumpners test, load sharing and operation of transformers in parallel, separation of no load losses by experimental method, principle of auto transformer, saving of copper compared to two winding transformer and its application. Lec no learning objective topics to be covered references 1 introduction introduction to electric machines chapter 1 2,3 magnetism magnetic circuits and induction 2.