It is the nature of delta and star connections and there is no specific intention to use this vector group. Application of transformer according to vector group. This is one of my power transformers vector group, which is 110 kv11 kv. The determination of vector group of transformers is very important before connecting two or more transformers in parallel. The determination of vector group of transformers is very important before. Dec 22, 2017 description of vector group testing of vector group bangla tutorial for power point slide go to eee practical knowledge. Vector group of transformers free download as powerpoint presentation. Performing transformer vector group test prepared by ir kamarul. A dyn11 transformer, if abc terminals are connected to rst phases, will shift the output from 12 o clock to 11 o clock ie 30 degrees back. Vector group test of power transformer electrical4u. The first letter d refers to the primary configuration being a delta connection the y refers to the secondary configuration being a star connection. So a vector group dyn11 is delta on primary, star on secondary, with neutral brought out and 330 degrees phase displacement.
The 1 indicates the lv winding lags the hv by 30 degrees penjelasannya kurang lebih seperti ini. The difference in output between the dyn11 and dny5 and is therefore 180 degrees. 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 transformer vector group show the phase difference between the primary and secondary sides of the transformer. Pdf transformer vector group test conditions k pandian. Transformer has a delta connected primary winding d a star connected secondary y with the star point brought out n and a. The transformer vector group is indicated on the name plate of transformer by the manufacturer. The vector group of a transformer defines the connection of the hv and lv windings. The vector group indicates the phase difference between the primary and secondary sides, introduced due to that particular configuration of transformer windings connection.
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. The phase sequence or the order in which the phases reach their. Basically this vector group arrangement will define the physical displacement of the generator shaft and the electrical phase of. Significance of vector group of transformer your electrical. Howard lorber has served as the companys president and chief executive officer since 1994. Three phase transformer vector grouping significance. Vector group of 3 winding transformer cr4 discussion thread.
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 most common types are rectifier transformers, converter transformers, harmonic mitigating transformers, zigzag transformers and quadrature boosters. Measurement of turn ratio and vector group check 3. Abobe two reply explained correctly what is vector group. Vector group of 3phase transformer electrical concepts. Training on vector groups of transformer presented by. I am an electrical engineer in an electro mechanical contracting company. This solution can be used as well for stepup applications in pv plants based on trio inverters. With the wye side as the reference vector at 12 oclock, we can draw the delta side vector at 11 oclock.
Because there are 12 hours on a clock, and a circle. The transformer can either be dyn5 or dyn11 or of any other vector group. Transformer vector group dyn11 and dyn1 physics forums. Description of vector group testing of vector group bangla tutorial for power point slide go to eee practical knowledge. Here yy 0 will mean its both the windings are starconnected and phase displacement between primary and secondary emfs is zero. The naming convention popularly known as vector group of transformer was established by the international electrotechnical commission iec through iec 600761. The secondary side of a distribution transformer must be yn. Based from this, we can say that this transformer connection belongs to the vector group ynd11.
It consists of a capital and small letter plus a code number. For one of our new projects,our scope included supply and installation of dedicated distribution transformer kva,11kv415 v along with ring main unit and feeder pillar. May 11, 2011 please i need your help to answer the following question what the difference between transformer dyn11 and dyn1 i know the difference is in leading and lagging of line to line voltages of primary and secondary but the question is, when i should use dyn11 or dyn1 as a must in the. 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. On the name plate of a three phase transformer, the.
Dyn11 is vector group representation of 3 phase transformers in electrical engineering, a vector group is the international electrotechnical commission iec. Every transformer contains its own vector group as shown below figure. Transformer vector group what is yd11 etc easy explanation. But after the winding connection is made it is necessary to check if the desired vector group has been achieved. Standard types supplied with separate primary and secondary windings. Why are ynd1ynd11 the most common vector groups for power. 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. Lets see the most commonly used transformers vector group is dyn11. Because generating transformer are ynd1 for neutralizing the load angle between 11 and 1. Dec 17, 2015 for example, a stepup transformer with a deltaconnected secondary, and wyeconnected primary, is written as dy1. The three phase transformer windings can be connected several ways. This was done in order to create a notation for threephase transformer winding configuration. By far the most common vector configuration of three phase transformers we manufacture is the dyn11 vector group. Gambar transformer berdasarkan vektor grup trafo listrik.
The answer to the last question why it is needed is as follows. In case of dyn11, the secondary vector leads the primary vector by 30 degrees, where as in dy1 connection, secondary vector lags the primary vector by 30. Contents hide 1 basic idea about transformer vector group 1. The vector diagrams are given in the name plate details of the transformer. If you are using a station auxiliary converter for startup and then when transferring the load to generator auxiliary transformer you must pick the vectors. In the past this was performed with help of interposing cts or special. 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. The vector group of transformer is an essential property for successful parallel operation of transformers.
This is can be used for both operations such as step down and step up. 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. What is the meaning of dyn 11 on a transformer nameplate. These phasor groups can be better understand by the following examples.
Here yy 0 will mean its both the windings are starconnected and phase displacement between primary and secondary emfs is zero degree. Liggett group llc tobacco and new valley llc real estate, including douglas elliman. Vector group of transformers transformer electric power. Notasi penamaan vektor group trafo selalu berurutan hvlv. Berdasarkan standar internasional dari iec 600761 international electrotechnical commission tentang vektor group trafo telah dinyatakan bahwa the notation is hvlv in sequence. 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. May 23, 2012 application of transformer according to vector group. 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. For q1, there is no way to determine the vector group on a oneline diagram except when explicitly labled. A dyn5 if connected the same way will advance the output to 5 o clock ie 150 degrees forward.
The three phase transformer is connected in various ways. Transformer nameplates carry a vector group reference such at yy0, yd1, dyn11 etc. Why are ynd1ynd11 the most common vector groups for power transformers even though the generators are generally starconnected. Transformer vector group connections are made based on the winding polarity. Significance of vector group of transformer on the nameplate of threephase transformer vector group is printed as yy 0, dd 1 etc. I was asked to get quotations from suppliers and analyse technical details of those. Normally, dyn11 vector group using at distribution system. From your question above, i presume that ur understanding of the transformer is not complete. 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. Confidential property of schneider electric page vector group example. It also determines the high voltage and low voltage windings arrangement of three phase transformers.
Vector group test of power transformer electrical study. Application of transformer according to vector group 1. So a vector group dyn11 is delta on primary, star on secondary, with. Oct 14, 2018 the real time examples for phasor groups of transformer are given here. Dyn11 is vector group representation of 3 phase transformers 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 confi. Vector group of a transformer describes the relation between primary voltage vectors and the secondary voltage vectors dyn11 means d primary delta connection. Oct 02, 2018 transformer vector group connections are made based on the winding polarity. Why vector group of distribution transformer is dyn11.
The following information is obtained from the vector diagram. Please note that u cannot have two different vector group on a single transformer,i. For example, a stepup transformer with a deltaconnected secondary, and wyeconnected primary, is. The connection of all the windings in a threephase transformer is indicated by. N n the neutral exists for connection outside the transformer the vector group determines the phase displacement between the primary and the secondary winding, and each unit in the vector group refers to 30 degrees displacement. 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. Normally dyn11 vector group using at distribution system. The following will tell you the suggestions with reasons. The following are the mostly used vector groups of transformers.
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