Transformer vector group free download as powerpoint presentation. The vector group of transformer is an essential property for successful parallel operation of transformers. Liggett group llc founded in 1873, liggett group llc is the fourthlargest cigarette manufacturer in the u. Significance of vector group of transformer on the nameplate of threephase transformer vector group is printed as yy 0, dd 1 etc. The secondary side of a distribution transformer must be yn or zn to provide the neutral connection, and usually the primary side connection is delta to avoid 3rd harmonics to inject to the.
Pdf transformer vector group test conditions k pandian. Performing transformer vector group test prepared by ir kamarul ariffin yahya uptp27 lead electrical engineer p27 amt supervisor. According to iec764, the value of vector group can be 0,1,2,4,5,6,7,8,10,11. A vector group is a means of identifying which combination of threephase connections deltawye, wyedelta, deltadelta, etc. The vector group provides a simple way of indicating how the internal connections of a transformer are arranged. Dec 12, 2017 vector group test, check the voltage phase shift of two or more transformer. Vector group of transformers transformer electric power. Transformer is the most important unit in an electrical distribution network. Description of vector group testing of vector group bangla tutorial for power point slide go to eee practical knowledge. Three phase transformer consists of three sets of primary windings, one for each phase, and three sets of secondary windings wound on the same iron core. What is meant by vector group for transformers and why is it important. Vector group test of power transformer electrical4u vector group test of transformer. So, if we get the result as above then the transformer is ynyn0 transformer. The three phase transformer is connected in various ways.
The vector diagrams are given in the name plate details of the transformer. I have faceting problem in testing of transformer vector group dy11y11y11y11, 380vx433000v for solar plant i have ask to client for factory. Morgan lacey in 1925, based on a series of pamphlets entitled transformer abstracts that were. Measure the voltages in various combination on both side of the transformer hv lv. The phase sequence or the order in which the phases reach their maximum. It consists of a capital and small letter plus a code number. Going counterclockwise between h1 and x1 can give wrong phase angle, and therefore wrong phase displacement number, which leads to wrong vector group and possibly to wrong test results. But after the winding connection is made it is necessary to check if the desired vector group has been achieved. This was done in order to create a notation for threephase transformer winding configuration. How do i draw vector group of transformer from winding connection.
Separate singlephase transformers can be used and externally interconnected to yield the same results as a 3phase unit. The clock method is used to produce the numerical index of the vector group, with each hour representing 30. Transformer connections from the same group can be. The transformer vector group show the phase difference between the primary and secondary sides of the transformer. The determination of vector group of transformers is very important before connecting two or more transformers in parallel.
Every transformer contains its own vector group as shown below figure. From a vector group one can determine the phaseshift between primary and secondary. Ratio and vector group test for trafo electric power. The connection of all the windings in a threephase transformer is indicated by a vector group symbol. What is meant by vector group for transformers and why is it. The vector group designation indicates the windings configurations and the difference in phase angle between them. Dv power smart test instruments for reliable electrical. The naming convention popularly known as vector group of transformer was established by the international electrotechnical commission iec through iec 600761. Aim of vector group test is at site is to check if their is any damage in the windings during transportation and erection. Vector group in transformer pdf economical home lighting. Please note that u cannot have two different vector group on a single transformer,i. Transformer vector group connections are made based on the winding polarity. Vector group of 3 winding transformer cr4 discussion thread.
Differential protection solution for a 36pulse converter transformer differential protection application on the 36pulse drive is given in figure 6. Vector group test of power transformer electrical mastar. Transformer vector group depends upon removing harmonics. Significance of vector group of transformer your electrical. All transformers are subjected to various tests at the manufacturer. Through vector group of a transformer we can know that the winding configuration of a transformer. Three phase transformer vector grouping significance. The real time examples for phasor groups of transformer are given here. Winding resistance measurement iec 600761 turns ratio measurement iec 600761 oltc analysis iec 602141 transformer demagnetization. Vector group is punched on the name plate based on the user requirement by the manufacture. The clock method is used to produce the numerical index of. Vector group test of transformer testing of transformer. Applicationnote how to determine transformer vector group.
Vector group test of power transformer electrical study. These phasor groups can be better understand by the following examples. The vector group indicates the phase difference between the primary and secondary sides, introduced due to that particular configuration. Interposing cts are again used to put the overall transformer vector group to yd11y0 for the differential relay. Vector group test, check the voltage phase shift of two or more transformer. A vector group is the international electrotechnical commission iec method of categorizing the high voltage hv windings and low voltage lv. What is meant by vector group for transformers and why is. For q2, transformer vector group is very important especially when your system will eventually be connected another system in parallel at any point.
The vector group test is importent test in the transformer testing. The phase sequence or the order in which the phases reach their. Vector group test of power transformer electrical4u. Howard lorber has served as the companys president and chief executive officer since 1994. Jun 18, 2012 from a vector group one can determine the phaseshift between primary and secondary. If we want to connect two transformer in parallel then their phase shift should be same, otherwise there will be a.
Please give the detail procedure of vector group test with the example of. Transformer vector group test conditions transformer vector. Vector group test of power transformer electrical study app. What is the test procedure of vector group of a transformer. Here yy 0 will mean its both the windings are starconnected and phase displacement between primary and secondary emfs is zero degree. Heat run test iec 600762 excitation current measurement. Vector group of 3phase transformer electrical concepts. May 23, 2012 the vector group indicates the phase difference between the primary and secondary sides, introduced due to that particular configuration of transformer windings connection. Liggett group llc tobacco and new valley llc real estate, including douglas elliman.
Transformer vector group test conditions ynd1, ynd11, dyn11, ynyn0 and. Sep 26, 2017 the vector group transformer test is important for connecting two power transformer in parallel. For this a more complex vector group the zigzag or interconnected star configuration is used. Transformer book is still in demand is a tribute to the publishers and to the authors who have carried the torch to light our way for 75 years. There is no technical difference between the one vector groups i. Here yy 0 will mean its both the windings are starconnected and phase displacement between primary and secondary emfs is zero. Transformer vector group test conditions transformer.
Atharv deshpande, photography, electrical engineer. The vector group test is importent test in the transformer testing the test procedure 1. From your question above, i presume that ur understanding of the transformer is not complete. Assuming the reader has sufficient exposure to transformer winding connections. P department of electrical and electronics engineering loyola institute of technology and science loyola nagar, thovalai, tamilnadu629302, india abstract transformer is the most important unit in an electrical distribution network. Hence every electrical power transformer must undergo through vector group test of transformer at factory site for ensuring the customer specified vector group of transformer. Understand significance of vector groups interpret the vector group notations used on transformer name plates content. If you are replacing a transformer, use the same vector group for the new transformer, otherwise the existing vts and cts used for protection and metering will not work properly.
Autotransformer vector group cr4 discussion thread. With regards to the protection circuit, you will need the vector group information in order to decide how you will wire the current transformers or if you are using numerical relays, what compensation will you need to apply. I have faceting problem in testing of transformer vector group dy11y11y11y11,380vx433000v for solar plant i have ask to client for factory. Vector group test of transformerthe vector group of transformer is an essential property for successful parallel operation of transformers. Vector group test of transformer the vector group of transformer is an essential property for successful parallel operation of transformers. The vector group designation indicates the windings configurations. The clock method is used to produce the numerical index of the vector group. The standard test usually links the a and a terminals then applies a suitable safe test voltage to the hv winding, and the resulting voltages between terminals prove the vector group. Why vector group of distribution transformer is dyn11. Threephase transformer connections and vector groups for. The transformer vector group is indicated on the name plate of. Jun 24, 2015 pdf scribd vector group of transformer.
It also determines the high voltage and low voltage windings arrangement of three phase transformers. Practical experience with differential protection for. The vector group transformer test is important for connecting two power transformer in parallel. Transformer vector group the vector group test is importent test in the transformer testing. Dec 22, 2017 description of vector group testing of vector group bangla tutorial for power point slide go to eee practical knowledge. Vector groups identify the winding connections and polarities of the primary and secondary. Hence every electrical power transformer must undergo through vector group test of transformer at factory site for ensuring the customer specified vector group of transformer the phase sequence or the order in which the phases reach their maximum. The primary windings are connected in one of several. Vector group of transformers free download as powerpoint presentation. What is vector group ynyn0d11 in a power transformer answers. We can test its vector group configuration after connecting the transformer like below image. Understanding vector group of transformer part 1 the primary windings are connected in one of several ways. Here as well two separate transformers are used to build the converter transformer. Dy connection y winding nullifies 3rd harmonics, preventing it to be reflected on delta side.
A vector group is a method of specifying a threephase transformer or transformer bank method of connection and its angular displacement. Rphase hv and rphase lv shorted for all vector group of transformer. The vector group indicates the phase difference between the primary and secondary sides, introduced due to that particular configuration of transformer windings connection. Contents hide 1 basic idea about transformer vector group 1.
Note that when determining the angle between h1 and x1, the rotation must be clockwise. How to draw vector group of transformer from winding. In other words the vector group of a transformer cannot aid in eliminating the harmonic content in its inrush current. Basic idea about transformer vector group in theory of a threephase transformer works like three equal and separated singlephase transformers working separately with three phase system with shared limbs.
What is the test procedure of vector group of a transformer having. It should be noted that it is not possible to generate a zero phase shift between primary and secondary with a combination of delta and star windings. A vector group is the international electrotechnical commission iec method of categorizing the high voltage hv windings and low voltage lv winding configurations of threephase transformers. Mainly, the type of transformer connections are divided in 4 below groups.
Importance and elimination of third harmonics application and selection of vector group of transformer. If two transformers of different vector groups are connected in parallel. 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. The transformer vector group is indicated on the name plate of transformer by the manufacturer. This symbol indicates the winding connections and their relative phase displacement by means of a numerical index e.
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