The vector group of a transformer may be found by a simple test using a 3 phase power supply of about 440 volts and a multimeter. Transformer, voltage ratio, vector group, impedance, shortwhat is vector group. The harmonics in a transformer are present only in the transformer inrush current predominantly 2 nd harmonic content. Vector group test of power transformer electrical mastar. Pdf transformer vector group test conditions k pandian. Dec 12, 20 transformers built to ansi standards usually do not have the vector group shown on their nameplate and instead a vector diagram is given to show the relationship between the primary and other windings. Why are ynd1ynd11 the most common vector groups for power. Our products can be found and are in use in more than 90 countries. Atrf110100 en, apn20304xx transformers built to ansi standards usually do not have a vector group shown on their nameplate and instead a vector diagram is given to show the relationship between the primary and other windings. If two transformers of different vector groups are connected in parallel.
Hv side delta,lv side star 1 connect hvside with 3 phase supply, 2 short with a cable hv r phase. First, connect the test power supply to high voltage winding. Automatic vector group detection verification of demagnetization process magnetic balance test connecting trt400 to test object threephase transformer trt400 is programmed to automatically test turns ratio, phase shift, and excitation current of power and distribution transformer types defined by ceiiec, ieee, and ansi standards. Hence every electrical power transformer must undergo through vector group test of transformer at factory site for ensuring the customer. So a vector group dyn11 is delta on primary, star on secondary, with. This cannot be avoided by selecting a tansformer with a particular vector group. 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 power transformer electrical4u. Rphase hv and rphase lv shorted for all vector group of transformer. Vector group test, check the voltage phase shift of two or more transformer. Separate singlephase transformers can be used and externally interconnected to yield the same results as a 3phase unit.
True threephase transformer turns ratio tester trt400. The vector group of transformer is an essential property for successful parallel operation of transformers. I have been told that for any given va rating a yy transformer costs less than a dy transformer. There is no technical difference between the one vector groups i. Transformers built to ansi standards usually do not have the vector group shown on their nameplate and instead a vector diagram is given to show the relationship between the primary and other windings. The following examples are for two winding three phase transformers. Nov 05, 20 connections for dy11 and dy1 transformers and the corresponding vector groupings are given in figure. Windings can be connected as delta, star, or interconnec. The vector group also defines differences in phase angles between them. You can directly earth the star points or you may wish to resistively earth them to limit the 3. What is the test procedure of vector group of a transformer having. Transformer vector group free download as word doc. 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. Transformer vecttransformer vector group test conditionsor group test conditions free download as pdf file.
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. Windings can be connected as delta, star, or interconnectedstar zigzag. Basically, the power flow is the steady state condition of the system and therefore must assume that all transformers. Liggett group llc tobacco and new valley llc real estate, including douglas elliman. Interposing cts are again used to put the overall transformer vector group to yd11y0 for the differential relay. All transformers are subjected to various tests at the manufacturer. The recalculation factor is pending transformer vector configuration and when applicable also the actual ttr test setup including eventual shorts to create a virtual neutral terminal. The vector group of a transformer does not change the power flow of a system. In electrical engineering, a vector group is the international electrotechnical commission iec.
Dv power manufactures the most advanced testing solutions for electrical energy systems. Continued from first part understanding vector group of transformer part 1 points to be consider while selecting of vector group vector groups are the iec method of categorizing the primary and secondary winding configurations of 3phase transformers. Why are ynd1ynd11 the most common vector groups for power transformers even though the generators are generally starconnected. Vector group of a transformer physical quantities electricity. Dy connection y winding nullifies 3rd harmonics, preventing it to be reflected on delta side. Transformers connected in parallel must have the same vector group. On the name plate of a three phase transformer, the vector group is written as. The testing of the vector group of the transformer is a very important check. Hi, all the transformers in a subtransmission network are dyn11, in another part of the network a transformer with the vector group of ynd1 is going to be used for an industrial complex. Transformer vector group depends upon removing harmonics. May 05, 2019 in the system adopted by the iec, the vector group is indicated by a code consisting of two or three letters, followed by one or two numeric digits. 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. Winding polarity is also important, since reversing the connections across a set of windings affects the phaseshift between primary and secondary. The primary windings are connected in one of several.
The vector group denotes the way in which the windings of a transformer are connected and the phase position of their respective voltage vectors. The clock method is used to produce the numerical index of the vector group. How does transformers vector group affect on power flow. Please give the detail procedure of vector group test with the example of. The transformer vector group show the phase difference between the primary and secondary sides of the transformer. Dv power smart test instruments for reliable electrical. Turning vector diagram into vector group is essential and necessary before making the test. Dec 12, 2017 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 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. Measure the voltage between the primary and the secondary terminals. Vector group test of power transformer universal clab youtube. Transformer vecttransformer vector group test conditionsor group.
Vector group of 3phase transformer electrical concepts. For this a more complex vector group the zigzag or interconnected star configuration is used. Vector group test of transformer testing of transformer. Atrf110100 en, apn20304xx how to determine transformer vector group a vector group is the international electrotechnical commission iec method of defining high voltage hv and low voltage lv winding configurations of threephase transformers. Electrical insulators are a very high resistive path through which practically no current can flow. Vector group test of power transformer electrical study. The vector group indicates the phase difference between the primary and secondary sides, introduced due to that particular configuration. What is the test procedure of vector group of a transformer. The vector group provides a simple way of indicating how the internal connections of a transformer are arranged. The vector group designation indicates the windings configurations. The three phase transformer windings can be connected several ways. The r terminal of the hv winding and the r terminal of the lv winding. These tests are done when the tap of transformer is nominal.
The vector group indicates the phase difference between the primary and secondary sides, introduced due to that particular configuration of transformer windings connection. Performing transformer vector group test prepared by ir kamarul ariffin yahya uptp27 lead electrical engineer p27 amt supervisor. Significance of vector group of transformer on the nameplate of threephase transformer vector group is printed as yy 0, dd 1 etc. Transformer vector group free download as powerpoint presentation. 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. Vector group of transformers free download as powerpoint presentation. Vector groups are the iec method of categorizing the primary and secondary winding configurations of 3phase transformers. The transformer vector group is indicated on the name plate of. The actual vector group dy1 or dy11 does not matter, just match other transformers that may already be at your plant. Transformer is the most important unit in an electrical distribution network. One procedure of vector group testing of transformer is explained as below. Sep 03, 2016 through vector group of a transformer we can know that the winding configuration of a transformer. Jun 18, 2012 from a vector group one can determine the phaseshift between primary and secondary.
Howard lorber has served as the companys president and chief executive officer since 1994. Vector group test of transformer is done for detecting the vector group. The clock method is used to produce the numerical index of. Points to be consider while selecting of vector group. In the system adopted by the iec, the vector group is indicated by a code consisting of two or three letters, followed by one or two numeric digits. On the name plate of a three phase transformer, the.
Vector group test is done in order to know the phase displacement between the high voltage and low voltage winding. Material made available on the website is proprietary and vector group. Here yy 0 will mean its both the windings are starconnected and phase displacement between primary and secondary emfs is zero degree. Through vector group of a transformer we can know that the winding configuration of a transformer. Applicationnote how to determine transformer vector group. The three phase transformer is connected in various ways. 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. Dec 22, 2017 description of vector group testing of vector group bangla tutorial for power point slide go to eee practical knowledge. The following requirements shall be fulfilled depending on the vector group of the transformers. Vector group of transformers transformer electric power.
Hv winding extensions then, the ret 670 software features can be used in a usual way to provide differential protection for this special transformer, as if it were a standard power transformer e. Significance of vector group of transformer your electrical. 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. Department of electrical and electronics engineering. Jan 30, 20 what is vector group ynyn0 in transformer.
We can test its vector group configuration after connecting the transformer like below image. The power transformer used to transfer the high voltage supply from one place to another. Electrical insulators must be used in electrical systems to prevent. Vector group test of power transformer electrical study app. The vector group also determines the phase displacement between the primary and the secondary winding, each unit in the vector group refers to 30 degrees displacement. The following will tell you the suggestions with reasons. The vector group provides a simple way of indicating how the connections of a transformer are arranged. Basically this vector group arrangement will define the physical displacement of the generator shaft and the electrical phase of.
Aim of vector group test is at site is to check if their is any damage in the windings during transportation and erection. If we want to connect two transformer in parallel then their phase shift should be same, otherwise there will be a. The transformer vector group is indicated on the name plate of transformer by the manufacturer. Vector group is punched on the name plate based on the user requirement by the manufacture. Here as well two separate transformers are used to build the converter transformer.
I have faceting problem in testing of transformer vector group dy11y11y11y11,380vx433000v for solar plant i have ask to client for factory. In other words the vector group of a transformer cannot aid in eliminating the harmonic content in its inrush current. Without earthing the winding neutral points, interconnect one phase of hv winding say 1u to the corresponding phase of lv winding 2u and apply a balanced 3 phase low voltage to the hv winding. Aug 07, 2019 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. Vector group test of transformerthe vector group of transformer is an essential property for successful parallel operation of transformers. It also determines the high voltage and low voltage windings arrangement of three phase transformers. Description of vector group testing of vector group bangla tutorial for power point slide go to eee practical knowledge.
Transformer oil testing transformer utilization factor. This symbol indicates the winding connections and their relative phase displacement by means of a numerical index e. May 23, 2012 transformers built to ansi standards usually do not have the vector group shown on their nameplate and instead a vector diagram is given to show the relationship between the primary and other windings. What is meant by vector group for transformers and why is.
Vector group of 3 winding transformer cr4 discussion thread. Here yy 0 will mean its both the windings are starconnected and phase displacement between primary and secondary emfs is zero. In this way you can measure the vector group of any 3 phase transformer. Differential protection solution for a 36pulse converter transformer differential protection application on the 36pulse drive is given in figure 6. The connection of all the windings in a threephase transformer is indicated by a vector group symbol.
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