Vector group test of transformerthe vector group of transformer is an essential property for successful parallel operation of transformers. The determination of vector group of transformers is very important before connecting two or more transformers in parallel. This was done in order to create a notation for threephase transformer winding configuration. Through vector group of a transformer we can know that the winding configuration of a transformer. Transformer is the most important unit in an electrical distribution network. Performing transformer vector group test prepared by ir kamarul ariffin yahya uptp27 lead electrical engineer p27 amt supervisor. Transformer vector group connections are made based on the winding polarity. The vector group provides a simple way of indicating how the internal connections of a transformer are arranged. Sep 26, 2017 the vector group transformer test is important for connecting two power transformer in parallel.
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. Jun 18, 2012 from a vector group one can determine the phaseshift between primary and secondary. The transformer vector group show the phase difference between the primary and secondary sides of the transformer. The vector group designation indicates the windings configurations and the difference in phase angle between them. But after the winding connection is made it is necessary to check if the desired vector group has been achieved. Vector group test of power transformer electrical4u. Vector group test of power transformer electrical4u vector group test of transformer. 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. Please give the detail procedure of vector group test with the example of. A vector group is a method of specifying a threephase transformer or transformer bank method of connection and its angular displacement. The vector group indicates the phase difference between the primary and secondary sides, introduced due to that particular configuration of transformer windings connection. Autotransformer vector group cr4 discussion thread. 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.
What is the test procedure of vector group of a transformer. The three phase transformer is connected in various ways. Aim of vector group test is at site is to check if their is any damage in the windings during transportation and erection. The connection of all the windings in a threephase transformer is indicated by a vector group symbol. The naming convention popularly known as vector group of transformer was established by the international electrotechnical commission iec through iec 600761. Transformer vector group free download as powerpoint presentation. The clock method is used to produce the numerical index of the vector group. The phase sequence or the order in which the phases reach their maximum. Transformer vector group test conditions transformer vector.
Interposing cts are again used to put the overall transformer vector group to yd11y0 for the differential relay. There is no technical difference between the one vector groups i. Vector group is punched on the name plate based on the user requirement by the manufacture. Dec 12, 2017 vector group test, check the voltage phase shift of two or more transformer. This symbol indicates the winding connections and their relative phase displacement by means of a numerical index e. The vector group of transformer is an essential property for successful parallel operation of transformers. How to draw vector group of transformer from winding.
A vector group is the international electrotechnical commission iec method of categorizing the high voltage hv windings and low voltage lv. Vector group test of transformer the vector group of transformer is an essential property for successful parallel operation of transformers. Howard lorber has served as the companys president and chief executive officer since 1994. Significance of vector group of transformer on the nameplate of threephase transformer vector group is printed as yy 0, dd 1 etc. The real time examples for phasor groups of transformer are given here. Ratio and vector group test for trafo electric power. Rphase hv and rphase lv shorted for all vector group of transformer. All transformers are subjected to various tests at the manufacturer.
It consists of a capital and small letter plus a code number. Dy connection y winding nullifies 3rd harmonics, preventing it to be reflected on delta side. Applicationnote how to determine transformer vector group. How do i draw vector group of transformer from winding connection. 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. Morgan lacey in 1925, based on a series of pamphlets entitled transformer abstracts that were. Vector group of 3phase transformer electrical concepts. Here yy 0 will mean its both the windings are starconnected and phase displacement between primary and secondary emfs is zero degree. Vector group test of power transformer electrical study. 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.
A vector group is a means of identifying which combination of threephase connections deltawye, wyedelta, deltadelta, etc. 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. The vector group designation indicates the windings configurations. Vector group in transformer pdf economical home lighting. For q2, transformer vector group is very important especially when your system will eventually be connected another system in parallel at any point. Liggett group llc founded in 1873, liggett group llc is the fourthlargest cigarette manufacturer in the u. The clock method is used to produce the numerical index of. Dec 22, 2017 description of vector group testing of vector group bangla tutorial for power point slide go to eee practical knowledge. The phase sequence or the order in which the phases reach their. What is meant by vector group for transformers and why is. The vector group transformer test is important for connecting two power transformer in parallel. Dv power smart test instruments for reliable electrical.
Description of vector group testing of vector group bangla tutorial for power point slide go to eee practical knowledge. Contents hide 1 basic idea about transformer vector group 1. Threephase transformer connections and vector groups for. Heat run test iec 600762 excitation current measurement. 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. I have faceting problem in testing of transformer vector group dy11y11y11y11, 380vx433000v for solar plant i have ask to client for factory. It also determines the high voltage and low voltage windings arrangement of three phase transformers. Mainly, the type of transformer connections are divided in 4 below groups. Differential protection solution for a 36pulse converter transformer differential protection application on the 36pulse drive is given in figure 6. Atharv deshpande, photography, electrical engineer. From your question above, i presume that ur understanding of the transformer is not complete. The vector group test is importent test in the transformer testing the test procedure 1. 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.
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. Transformer vector group the vector group test is importent test in the transformer testing. What is vector group ynyn0d11 in a power transformer answers. Vector group of 3 winding transformer cr4 discussion thread. 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.
So, if we get the result as above then the transformer is ynyn0 transformer. Vector groups identify the winding connections and polarities of the primary and secondary. Importance and elimination of third harmonics application and selection of vector group of transformer. Why vector group of distribution transformer is dyn11. Vector group test, check the voltage phase shift of two or more transformer. According to iec764, the value of vector group can be 0,1,2,4,5,6,7,8,10,11.
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. Assuming the reader has sufficient exposure to transformer winding connections. What is the test procedure of vector group of a transformer having. If two transformers of different vector groups are connected in parallel. 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. Pdf transformer vector group test conditions k pandian.
Vector group of transformers free download as powerpoint presentation. Significance of vector group of transformer your electrical. 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. What is meant by vector group for transformers and why is it. Transformer connections from the same group can be. Transformer vector group test conditions ynd1, ynd11, dyn11, ynyn0 and. If we want to connect two transformer in parallel then their phase shift should be same, otherwise there will be a. Vector group test of power transformer electrical mastar. 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. Vector group test of power transformer electrical study app. The vector group test is importent test in the transformer testing.
Here as well two separate transformers are used to build the converter transformer. Measure the voltages in various combination on both side of the transformer hv lv. The transformer vector group is indicated on the name plate of. In other words the vector group of a transformer cannot aid in eliminating the harmonic content in its inrush current. The primary windings are connected in one of several. The clock method is used to produce the numerical index of the vector group, with each hour representing 30. I have faceting problem in testing of transformer vector group dy11y11y11y11,380vx433000v for solar plant i have ask to client for factory.
Jun 24, 2015 pdf scribd vector group of transformer. Winding resistance measurement iec 600761 turns ratio measurement iec 600761 oltc analysis iec 602141 transformer demagnetization. Understand significance of vector groups interpret the vector group notations used on transformer name plates content. Note that when determining the angle between h1 and x1, the rotation must be clockwise. 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. Transformer vector group depends upon removing harmonics.
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. 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. What is meant by vector group for transformers and why is it important. Practical experience with differential protection for. The transformer vector group is indicated on the name plate of transformer by the manufacturer. The vector diagrams are given in the name plate details of the transformer. These phasor groups can be better understand by the following examples. Liggett group llc tobacco and new valley llc real estate, including douglas elliman. Separate singlephase transformers can be used and externally interconnected to yield the same results as a 3phase unit. For this a more complex vector group the zigzag or interconnected star configuration is used.763 773 1014 1016 1438 430 1236 392 575 854 402 1418 601 821 1120 852 62 1051 1506 493 1378 789 817 237 406 127 328