Aim of vector group test is at site is to check if their is any damage in the windings. Vector group test of power transformer electrical mastar. The phase sequence or the order in which the phases reach their. Vector groups are the iec method of categorizing the primary and secondary winding configurations of 3phase transformers. 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. Three phase transformer vector grouping significance. Markings of winding connections regarding 3ac transformers. Threephase transformer connections and vector groups for. In electrical engineering, 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 vector groups three phase supply systems consist of three independent sinusoidal voltage waveforms with a phase angle between each phase of 120, as shown in the graph.
These phasor groups can be better understand by the following examples. Vector group in transformer pdf economical home lighting. Vector group of transformers free download as powerpoint presentation. What is an interleaved connection of a transformer winding. Understanding transformer vector groups valence electrical. All transformers are subjected to various tests at the manufacturer. Significance of vector group of transformer your electrical.
This video contains vector grouping of three phase transformer for starstar and deltadelta connections. Vector grouping of three phase transformer part 1 youtube. Estimation of voltage ratio, vector relationship, impedance. 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 only factor affecting the choice between one or the other is system phasing, i.
Mainly, the type of transformer connections are divided in 4 below groups. A three phase transformer is one of the vital apparatus in the power systems. Simulink analysis of vector groups of transformers. The nameplate shows what the factory thought as the most probable vector group, but any dy or yd transformer can have any of the odd numbered vector groups. Mar 16, 2016 logo eps is the worlds largest library of brand logos in vector format available to download for free. The two transformers may have their windings connected in starstar and yet it will not be possible to operate in parallel if one belongs to group 1 and the other to group 2, unless the internal connections of the secondary winding of one of the transformers are changed. It also determines the high voltage and low voltage windings arrangement of three phase transformers.
Vector group is punched on the name plate based on the user requirement by the manufacture. Performing transformer vector group test prepared by ir kamarul ariffin yahya uptp27 lead electrical engineer p27 amt supervisor. There is no technical difference between the one vector groups i. 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. Download free autobot from transformers vector logo and icons in ai, eps, cdr, svg, png formats. Transformer is the most important unit in an electrical distribution network. Transformer vector group the vector group test is importent test in the transformer testing. Transformers autobot vector logo transformers autobot logo. Transformers connected in parallel must have the same vector group. The threephase transformer noratel separate single.
The naming convention popularly known as vector group of transformer was established by the international electrotechnical commission iec through iec 600761. This was done in order to create a notation for threephase transformer winding configuration. Dy connection y winding nullifies 3rd harmonics, preventing it to be reflected on delta side. General aspects of vector groups of transformers 2. In this paper we have simulated the vector groups of transformers installed at 2 kv grid station qasimabad hyderabad pakistan with the use of matlab simulink software. The vector group of a transformer defines the connection of the hv and lv windings. Jan 31, 2016 also vectors groups of transformers connected in parallel are varied and their effects on system operation are also simulated.
Vector group test of power transformer electrical study. Download the vector logo of the transformers logo brand designed by rubenzibo in encapsulated postscript eps format. Vector group test of transformerthe vector group of transformer is an essential property for successful parallel operation of transformers. The current status of the logo is active, which means the logo is currently in use. I was lucky because the transformer ratio testset i used for the first couple of years in my career allowed me to make threephase connections, but it was really a singlephase tester and i had to change the connections one phase at time. If the two transformers of different vector groups are connected in parallel then phase difference exist between the secondary of the transformers and large circulating current flows between the two transformers which is very damaging. A transformer vector group is required to be known from the angle of parallel operation of two similar transformers. Training on vector groups of transformer presented by.
Here yy 0 will mean its both the windings are starconnected and phase displacement between primary and secondary emfs is zero degree. The three phase transformer is connected in various ways. According to iec764, the value of vector group can be 0,1,2,4,5,6,7,8,10,11. Power transformers vectors group bigamp electrical 14 feb 04 07. What is meant by vector group for transformers and why is.
Draw out the diagrams and thoroughly understand it for yourself. Transformers connected in parallel must have the same vector group mismatching. May 03, 2016 the concept of vector groups was adopted for transformers in the generation, transmission and distribution networks in a manner so as to make the overall phase shift zero 0 at the distribution end close to the customer. The real time examples for phasor groups of transformer are given here. Morgan lacey in 1925, based on a series of pamphlets entitled transformer abstracts that were. Material made available on the website is proprietary and vector group. Every transformer contains its own vector group as shown below figure. Why are ynd1ynd11 the most common vector groups for power. Windings can be connected as delta, star, or interconnec. Transformers logo brands of the world download vector. The determination of vector group of transformers is.
Dd0, dyn5, dyn11, yyn0, yd1, yd11, dz0, yz1 and yz11. Transformer vector group connections are made based on the winding polarity. Transformer vector group depends upon removing harmonics. The vector group designation indicates the windings configurations and the difference in phase angle between them. Pdf transformer vector group test conditions k pandian. How to confirm the phase shifting transformer vector group relation, as below zny11. The vector group of transformer is an essential property for successful parallel operation of transformers. 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. Contents hide 1 basic idea about transformer vector group 1. If two transformers of different vector groups are connected in parallel then phase difference exists between the secondary of the transformers and large circulating current flows between the two transformers. Now i am thinking to order a new oil transformer of dy11y11 configuration. These three voltages have been drawn relative to a common voltage reference or neutral point. May 23, 2012 vector groups are the iec method of categorizing the primary and secondary winding configurations of 3phase transformers. Vector group is an essential characteristics of 3 phase transformer.
What is meant by vector group for transformers and why is it. The vector group indicates the phase difference between the primary and secondary sides, introduced due to that particular configuration of transformer windings connection. The phase sequence or the order in which the phases reach their maximum. Subscribe our electrical engineering related channel electrical academy to get the. So it is utmost necessary to know how the inter connections to be made to form a particular vector group. The concept of vector groups was adopted for transformers in the generation, transmission and distribution networks in a manner so as to make the overall phase shift zero 0 at the distribution end close to the customer. For each vector group need diffrent type of voltage combination to conform. The determination of vector group of transformers is very important before connecting two or more transformers in parallel. If two transformers of different vector groups are connected in parallel then. Some basic connections of a 3phase transformer along with the idea of vector grouping is introduced. The capital letter a, b, c refers to the hv winding and the lower case a, b, c to the lv winding with a, b, c for. The power transformer connection type, the vector group and the subtraction of zero sequence currents onoff are setting parameters from these the differential protection calculates offline the matrix coefficients, which are then used in the online calculations. Vector group test of transformer the vector group of transformer is an essential property for successful parallel operation of transformers.
Vector group of transformers transformer electric power. This symbol indicates the winding connections and their relative phase displacement by means of a numerical index e. Winding polarity is also important, since reversing the connections across a set of windings affects the phaseshift between primary and secondary. Applicationnote how to determine transformer vector group. Sep 09, 2016 browse to see more transformers autobot related vector logos. The transformer vector group is indicated on the name plate of transformer by the manufacturer. 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. From a vector group one can determine the phaseshift between primary and secondary.
Introduction to vector group the vector group marks the circuitry of windings and their phase position to each other. Vector groups the connection of all the windings in a threephase transformer is indicated by a vector group symbol. In addition to the voltage ratios and kva ratings, one of the most important specifications is the transformer vector group. Understanding transformer vector group transformer is magnetically coupled circuit its primary and secondary voltages either in phase or out of phase to say them in phase or out of phase will all depend upon polarity considerations before to discussing polarity we will see something about notational basics of electricity 3. The following slides analysis the various vector group of the generation, transmission and distribution network of the ghana. Type tests are done mainly in a prototype unit not in all manufactured units in a lot.
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. Measure the voltages in various combination on both side of the transformer hv lv. How to draw vector group of transformer from winding. The vector diagrams are given in the name plate details of the transformer. The determination of vector group of transformers is very important before. Department of electrical and electronics engineering. 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.
Note that when determining the angle between h1 and x1, the rotation must be clockwise. Vector groups pdf transformer electric power free 30day trial. It consists of a capital and small letter plus a code number. This webinar brought to you by the relion product family. It means lv winding,which is star connected written in small letters means lv side and vice versais 30 degrees lagging by hv winding which is delta connected. Understanding transformer vector group linkedin slideshare. Dec 22, 2017 description of vector group testing of vector group bangla tutorial for power point slide go to eee practical knowledge. In a transformer, when we increase the load on the secondary side, how does the impedance of the primary winding decrease to increase the curr. Windings can be connected as delta, star, or interconnectedstar zigzag. A user friendly simulation for transformer vector group. 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.
International certification of electrical equipment. Three phase transformer consists of three sets of primary windings, one for each phase, and three sets of secondary windings wound on the. Vector group test of power transformer electrical4u. But after the winding connection is made it is necessary to check if the desired vector group has been achieved. The systems phase sequence should be 1u, iv, 1w, or r, s and t the following are the most common threephase connections. How to draw transformer vector group connectionelectrical. It enables you to quickly find the logo vector files you need by browsing or search through the entire collection of more than 200,000 vector logos.
Eps format, and open with adobe illustrator or adobe photoshop or coreldraw. The vector group transformer test is important for connecting two power transformer in parallel. Simulink analysis of vector groups of transformers installed. Transformer vector group free download as powerpoint presentation. The vector group designation indicates the windings configurations. The vector group of transformer is the phase difference between the primary and the secondary sides. We also make some real time changes in the vector groups of the installed transformers and would analyze their effects on the system operation. The transformer vector group show the phase difference between the primary and secondary sides of the transformer.
Transformer, voltage ratio, vector group, impedance. Understanding transformer vector groups transformer vector groups can be a difficult concept to understand. Thanks for reading about significance of vector group of transformer. In electrical engineering, a vector group is the international electrotechnical commission iec. For example, a wye hv winding and delta lv winding with a. Threephase transformer connections and vector groups for beginners photo credit. If two transformers of different vector groups are connected in parallel then phase difference exist between the secondary of the transformers and large circulating current flows between the two transformers which is very.
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