Power system components sources, transformer windings, loads, etc. Mod01 lec04 lecture04equivalent circuits of single. Harmonics and switching transients in single phase transformers. Three phase transformers a transformer bank composed of three single phase units may be replaced by one 3 phase 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. Single phase induction motor, theory of operation double revolving field theory, equivalent circuit, determination of. Mod01 lec05 lecture05testing of single phase transformers.
Equivalent circuit of ideal transformer lecture 06. Mod01 lec04 lecture04equivalent circuits of single phase. Each transformer is rated as 10 kva current rating is. Short circuit and open circuit test in single phase transformer. This transformer calculator helps you to quickly and easily calculate the primary and secondary fullload currents of the transformer. Transformer type k single phase shell type single phase core type three phase shell type three phase core type, distrbiuton i transformer three phase core type, power transformer 1 0 to 1 2 0. Single phase transformers, generally used in the north american system, are attached to the overhead wires with two different types of connections. We look at models of single phase twowinding, three phase twowinding, and three phase threewinding transformers, as well as auto transformers and regulating transformers. It also performs this with the help of mutual induction between two windings.
Three phase connection of singlephase transformers. The 3 phase stepdown transformer consists of three single phase y. Module 7 transformer version 2 ee iit, kharagpur lesson 23 ideal transformer version 2 ee iit, kharagpur contents 23 ideal transformer. Single phase diode rectifiers, al so in the bridge configuration, require a high transformer va rating for a given dc output power. Debaprasad kastha, department of electrical engineering, iit. It also determines the turns ratio and type of transformer. Electrical machinesi nptel online videos, courses iit.
Distribution drytype transformers low voltage eaton mar 3, 2017. Single phase induction motor the single phase induction machine is the most frequently used motor for refrigerators, washing machines, clocks, drills, compressors, pumps, and so forth. The efficiency and regulation of a transformer on any load condition and at any power factor condition can be predetermined by indirect loading method. Single phase transformer and applications of single phase. Please feel free to contact us if youd like to request a specific topic. Mod01 lec04 lecture04equivalent circuits of single phase transformers. Inrush of switching currents, harmonics in single phase transformers, magnetizing current wave form, parallel operation of transformers. But the equivalent circuit parameters of a transformer are determined by conducting. Nptel transformers video lectures, electrical machines lectures, dc machines video, nptel video lectures, nptel online courses, youtube iit videos nptel courses. An electrical power transformer is a static device, which transforms electrical energy from one circuit to another without any direct electrical connection. Lecture series on basic electrical technology by prof. Comparison of leakage reactance of two single phase transformers. Learn for free, pay a small fee for exam and get a certificate. Transformer basics electric machines single phase transformer three phase transformer transformer type instrument transformer transformer test transformer accessories transformer oil maintenance of transformers installation of transformers transformer protection.
Select the number of phases from the dropdown menu. Parallel operation of one phase and two phase transformers. The three phase system application means using three single phase units connected in the three phase system. The statements are also valid for three phase banks of single phase transformers connected together externally. Clearly, linetolinevoltagesthemselvesform a three phase set just as do linetoneutral voltages. The single phase motor stator has a laminated iron core with two windings arranged perpendicularly. Three phase connection of single phase transformers. Linetoline voltages are phase shifted by 30 ahead of linetoneutral voltages. So, this figure if i actually the figure i will show you figure shows the equivalent circuit of a single phase transformer referred to lowvoltage side of 200 volt.
Mod01 lec10 lecture10introduction to three phase transformer. Mod01 lec09 lecture09harmonics and switching transients in single phase transformers 10. View notes l23tbet ee nptel from ee 203 at iit kanpur. Umanand, principal research scientist, power electronics group, cedt, iisc bangalore for more detail. This is a more expensive solution, and it is used in the high voltage power system. The gating signals of single phase inverters should be advanced or delayed by with respect to each other in order to obtain three phase balanced fundamental voltages. Parallel operation of two singlephase transformers aim. Debaprasad kastha, department of electrical engineering, iit kharagpur. Parallel operation of two singlephase transformers aim to understand prerequisites for operation of transformers in parallel to study powersharing between two single phase transformers operated in parallel theory a power transformer is one of the most vital. Because there is such a large range of application areas involved, specific and differentiated solutions. Single phase transformers general transformers are used in any application where the load voltage is different from the available mains voltage. Poly phase connections and poly phase transformers.
Lecture notes electrical machine ii bee 1401 page 1. Setting procedures are only discussed in a general nature in the material to follow. The stepup 3 phase transformer is rated at 90 mva, 11 kvy 110 kvy with 10% leakage reactance. Rated current and rated voltage with example lecture. A single phase wye transformer usually has only one bushing on top, connected to one of the three primary. Lecture 2 power transformers the ideal transformer the real transformer equivalent circuits for practical transformers the perunit system. Nptel video lectures, iit video lectures online, nptel youtube lectures, free video lectures, nptel online courses, youtube iit videos nptel courses. The connection of three identical single phase transformers to be used in 3 phase system. The maximum value of the magnetic flux density is 1. In this method, the actual load is not used on transformer. Their job is to convert transform the mains voltage into the voltage that is actually required. Wye on a wye distribution circuit, a wye or phase to neutral transformer is used. Nptel, online courses and certification, learn for free. The advantages of three single phase units are transportation, maintenance, and spare unit availability.
Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Umanand, principal research scientist, power electronics group, cedt, iisc bangalore. View notes l25tbet ee nptel from ee 203 at iit kanpur. Transformer protection application guide a free service. Mod01 lec08 lecture08parallel operation of single phase transformers 9.
Next few problems highlight the basic calculation steps involved in ideal 3 phase transformer and ideal auto transformer since the equivalent circuit of these transformers are outside the scope of first year electrical technology course. Say 4500 upon 225 voltage in a step down transformer 50 hertz, 50 hertz means the frequency, right f is equal to 50 hertz. In this diagram, a three phase unity pf load resistive load is supplied by two transformers. The above figure shows the connection diagram of an open delta system. That we will study single phase transformers only and after this we will see that your 3 phase induction machine only in brief and then the dc machine will the. Electrical engineering electrical machines i nptel. A single phase transformer has 480 turns on the primary winding and 90 turns on the secondary winding. Umanand, principal research scientist, power electronics group, cedt, iisc bangalore for more details on nptel visit. The use of a 2winding transformer as an autotransformer. Transformer protection application guide this guide focuses primarily on application of protective relays for the protection of power transformers, with an emphasis on the most prevalent protection schemes and transformers.
Single phase emf generation, average and effective values of sinusoids, j operations, complex representation of impedances, phasor diagrams, power factor, power in complex notation, solution of series and parallel circuits. Th is type of rec tifiers is suitable for low power applications. Electrical engineering basic electrical technology nptel. Eatons family of drytype distribution transformers. Three phase connection of singlephase transformers introduction the primary and secondary windings of three single phase transformers can be connected in di erent con gurations to meet speci c 3 phase system requirements. This ppt covers the operating principle,its construction,equivalent circuit and efficiency of a single phase transformer. Perunit system for single phase transformer consider the equivalent circuit of transformer referred to lv side and hv side shown below.
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