If one browses transformer sales literature, technical papers and books, and industry standards such as ieee c57. Edvard jun 03, but i want to know about the test methode and voltage relation of different type vector group. Three phase transformer vector grouping significance. Vector group test of power transformer electrical4u. Vector group test, check the voltage phase shift of two or more transformer. Department of electrical and electronics engineering. The vector group indicates the phase difference between the primary and secondary sides, introduced due to that particular configuration of transformer windings connection. It also determines the high voltage and low voltage windings arrangement of three phase transformers.
We can test its vector group configuration after connecting the transformer like below image. Transformer vector group free download as powerpoint presentation. Transformer vector group the vector group test is importent test in the transformer testing. Vector group is punched on the name plate based on the user requirement by the manufacture. Vector group of 3phase transformer electrical concepts. What is the test procedure of vector group of a transformer having.
For this a more complex vector group the zigzag or interconnected star configuration is used. The transformer vector group is indicated on the name plate of transformer by the manufacturer. Vector groups are the iec method of categorizing the primary and secondary winding configurations of 3phase transformers. Vector group test of power transformer electrical mastar. The main ct secondary current magnitudes are not altered at all on the lv side. Assuming the reader has sufficient exposure to transformer winding connections.
I have faceting problem in testing of transformer vector group dy11y11y11y11, 380vx433000v for solar plant i have ask to client for factory. In special transformer where the phase shift is not in multiples of 30 particularly for the isolation transformer incorporated to reduce the harmonics, directly the phase angle is been mentioned by the manufacturers to carry out the vector group test one should establish the electrical connection between primary and secondary since the separate. Interposing cts are again used to put the overall transformer vector group to yd11y0 for the differential relay. Significance of vector group of transformer your electrical. The vector group of transformer is an essential property for successful parallel operation of transformers. This was done in order to create a notation for threephase transformer winding configuration.
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. Sep 26, 2017 the vector group transformer test is important for connecting two power transformer in parallel. Here yy 0 will mean its both the windings are starconnected and phase displacement between primary and secondary emfs is zero. The vector group designation indicates the windings configurations. The vector group indicates the phase difference between the primary and secondary sides, introduced due to that particular configuration. Vector group of 3 winding transformer cr4 discussion thread. Dec 22, 2017 description of vector group testing of vector group bangla tutorial for power point slide go to eee practical knowledge. 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. Transformer vector group connections are made based on the winding polarity. If we want to connect two transformer in parallel then their phase shift should be same, otherwise there will be a. The phase sequence or the order in which the phases reach their.
Transformer, voltage ratio, vector group, impedance, shortwhat is vector group. Then ret 670 software features can be used in a usual way to compensate for this special transformer, as if it were a standard twowinding transformer with vector group yy0. Applicationnote how to determine transformer vector group. Vector group test of transformer the vector group of transformer is an essential property for successful parallel operation of transformers.
The connection of all the windings in a threephase transformer is indicated by a vector group symbol. From your question above, i presume that ur understanding of the transformer is not complete. Significance of vector group of transformer on the nameplate of threephase transformer vector group is printed as yy 0, dd 1 etc. Pdf transformer vector group test conditions k pandian.
Assuming the reader has sufficient exposure to transformer winding connections transformer vector group test conditions ynd1, ynd11, dyn11, ynyn0 and more pandian. 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. According to iec764, the value of vector group can be 0,1,2,4,5,6,7,8,10,11. Pdf performing transformer vector group test kamarul. 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. The three phase transformer is connected in various ways. Description of vector group testing of vector group bangla tutorial for power point slide go to eee practical knowledge. 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.
The clock method is used to produce the numerical index of the vector group, with each hour representing 30. Vector group test of power transformer electrical study app. In other words the vector group of a transformer cannot aid in eliminating the harmonic content in its inrush current. Here yy 0 will mean its both the windings are starconnected and phase displacement between primary and secondary emfs is zero degree. Please note that u cannot have two different vector group on a single transformer,i. These tests are done when the tap of transformer is nominal. One procedure of vector group testing of transformer is explained as below. 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 systems phase sequence should be 1u, iv, 1w, or r, s and t the following are the most common threephase connections.
What is meant by vector group for transformers and why is. Understanding vector group of transformer part 1 the primary windings are connected in one of several ways. Why vector group of distribution transformer is dyn11. The vector group test is importent test in the transformer testing the test procedure 1. Transformer vecttransformer vector group test conditionsor. Three phase transformer winding configurations and. Dyn11 transformer vector group pdf read 6 answers by scientists with 1 recommendation from their colleagues to the question asked by parth panchal on feb 11, the vector group designation. Mainly, the type of transformer connections are divided in 4 below groups.
Transformer testing dyn11 transformer power electronics free. Transformer vector group test conditions ynd1, ynd11, dyn11, ynyn0 and. 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. Transformer vecttransformer vector group test conditionsor group. Dd0, dyn5, dyn11, yyn0, yd1, yd11, dz0, yz1 and yz11. Here as well two separate transformers are used to build the converter transformer. All transformers are subjected to various tests at the manufacturer. 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. Vector group in transformer pdf economical home lighting.
Through vector group of a transformer we can know that the winding configuration of a transformer. Vector group test of transformer testing of transformer. The vector group transformer test is important for connecting two power transformer in parallel. The vector group designation indicates the windings configurations and the difference in phase angle between them. Vector group test of transformer is done for detecting the vector group. Transformer connections from the same group can be. This vector group test is done to confirm whether the vector group provided in the name plate is correct or not and also to confirm that the winding has not been damaged during transport. Threephase transformer connections and vector groups for. Practical experience with differential protection for.
Performing transformer vector group test prepared by ir kamarul ariffin yahya uptp27 lead electrical engineer p27 amt supervisor. The clock method is used to produce the numerical index of the vector group. 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. Windings can be connected as delta, star, or interconnec. Aim of vector group test is at site is to check if their is any damage in the windings during transportation and erection. A vector group is a method of specifying a threephase transformer or transformer bank method of connection and its angular displacement.
Note that when determining the angle between h1 and x1, the rotation must be clockwise. What is meant by vector group for transformers and why is it. 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 tobacco and new valley llc real estate, including douglas elliman. Dv power smart test instruments for reliable electrical. But after the winding connection is made it is necessary to check if the desired vector group has been achieved. 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. Vector group test of transformerthe vector group of transformer is an essential property for successful parallel operation of transformers. The vector diagrams are given in the name plate details of the transformer. The real time examples for phasor groups of transformer are given here. 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. Winding resistance measurement iec 600761 turns ratio measurement iec 600761 oltc analysis iec 602141 transformer demagnetization.
Jun 24, 2015 pdf scribd vector group of transformer. 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. Transformer testing dyn11 free download as pdf file. 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. These phasor groups can be better understand by the following examples. What is the test procedure of vector group of a transformer. The transformer vector group show the phase difference between the primary and secondary sides of the transformer. Autotransformer vector group cr4 discussion thread.
Dec 12, 2017 vector group test, check the voltage phase shift of two or more transformer. Transformer vecttransformer vector group test conditionsor group test conditions free download as pdf file. Transformer is the most important unit in an electrical distribution network. Howard lorber has served as the companys president and chief executive officer since 1994. I have faceting problem in testing of transformer vector group dy11y11y11y11,380vx433000v for solar plant i have ask to client for factory. The clock method is used to produce the numerical index of. Vector group test of power transformer electrical study.
The naming convention popularly known as vector group of transformer was established by the international electrotechnical commission iec through iec 600761. Contents hide 1 basic idea about transformer vector group 1. The vector group provides a simple way of indicating how the internal connections of a transformer are arranged. This symbol indicates the winding connections and their relative phase displacement by means of a numerical index e. The numerical index of the vector group comes from the clock hour gure the phase voltage hand 2u is at when the phase voltage hand of the high voltage winding 1u is at 12 oclock. We do this testing to check that vector group of transformers in. Vector group test of power transformer electrical4u vector group test of transformer. Differential protection solution for a 36pulse converter transformer differential protection application on the 36pulse drive is given in figure 6. What is vector group ynyn0d11 in a power transformer answers.
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