Vector group test of transformer is done for detecting the vector group. Vector group test of power transformer electrical study. But after the winding connection is made it is necessary to check if the desired vector group has been achieved. It is likely that the voltage in the tertiary winding is lv, hence d11 not d11.
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. The vector group indicates the phase difference between the primary and secondary sides, introduced due to that particular configuration of transformer windings connection. The transformer vector group show the phase difference between the primary and secondary sides of the transformer. Aim of vector group test is at site is to check if their is any damage in the windings during transportation and erection. Every transformer contains its own vector group as shown below figure. Liggett group llc tobacco and new valley llc real estate, including douglas elliman. 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 electrical4u vector group test of transformer. Transformer vecttransformer vector group test conditionsor group. Vector group is punched on the name plate based on the user requirement by the manufacture.
Transformer vector group free download as powerpoint presentation. When testing three phase transformers with different vector group arrangements, the ratio calculations are not straight forward like v2v1 and need to be matched for. A user friendly simulation for transformer vector group. First, connect the test power supply to high voltage winding. The connection of all the windings in a threephase transformer is indicated by a vector group symbol. 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. Performing transformer vector group test prepared by ir kamarul ariffin yahya uptp27 lead electrical engineer p27 amt supervisor. It is the nature of delta and star connections and there is no specific intention to use this vector group. A rating is usually determined based on the system expected load growth, available generation and expected rate of return on the investment. There are several internal connections of threephase transformer are available on the market. Vector group test of transformer the vector group of transformer is an essential property for successful parallel operation of transformers. Different grounding transformers vector group zn vector group ynd open five limb. Our products can be found and are in use in more than 90 countries. This is generally not a problem for iec based transformers, since the vector group is.
In addition to the voltage ratios and kva ratings, one of the most important specifications is the transformer vector group. Vector groups are the iec method of categorizing the primary and secondary winding configurations of 3phase transformers. Hence every electrical power transformer must undergo through vector group test of transformer at factory site for ensuring the customer. What is meant by vector group for transformers and why is. These properties are used to evaluate the end of reliable life of paper insulation. Significance of vector group of transformer on the nameplate of threephase transformer vector group is printed as yy 0, dd 1 etc. Based from this, we can say that this transformer connection belongs to the vector group ynd11.
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. One procedure of vector group testing of transformer is explained as below. Three phase transformer vector grouping significance. 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. Ensure the system is isolated or not and remove the earthing from the system. 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. 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. Vector group test of transformerthe vector group of transformer is an essential property for successful parallel operation of transformers. Rphase hv and rphase lv shorted for all vector group of transformer. A transformer vector group is required to be known from the angle of parallel operation of two similar transformers. Transformer vecttransformer vector group test conditionsor group test conditions free download as pdf file. The phase sequence or the order in which the phases reach their maximum. What is the test procedure of vector group of a transformer having. Primary and secondary must be star, with zero vector group phase shift, because there is no other way to use auto transformers on 3 phase.
Transformer applications such as two winding, autotransformer, step. I have faceting problem in testing of transformer vector group dy11y11y11y11,380vx433000v for solar plant i have ask to client for factory. Windings can be connected as delta, star, or interconnec. In a 3 phas e transformer, it is essential to carry out a vector group test of transformer. The following are the mostly used vector groups of transformers. Explanation and vector groups to applicate 1 phase and 3 phase autotransformers. The vector group designation indicates the windings configurations and the difference in phase angle between them. Through vector group of a transformer we can know that the winding configuration of a transformer. Dv power manufactures the most advanced testing solutions for electrical energy systems. Proper vector grouping in a transformer is an essential criteria for parallel operation of transformers. This symbol indicates the winding connections and their relative phase displacement by means of a numerical index e. Vector group test of power transformer electrical4u. The transformer vector group is indicated on the name plate of transformer by the manufacturer.
Example shows 90% power saving compared to an isolating transformer equation to calculate the requested size. The clock method is used to produce the numerical index of the vector group. Vector group test of power transformer electrical mastar. All transformers are subjected to various tests at the manufacturer. Howard lorber has served as the companys president and chief executive officer since 1994. This is generally not a problem for iec based transformers, since the vector group is stated on their nameplates. Dv power smart test instruments for reliable electrical. Vector group test of power transformer universal clab youtube.
Applicationnote how to determine transformer vector group. Autotransformers do not provide galvanic isolation. For q1, there is no way to determine the vector group on a oneline diagram except when explicitly labled. Contents hide 1 basic idea about transformer vector group 1. Transformer testing type tests and routine tests of. Autotransformer vector group cr4 discussion thread. These tests are done when the tap of transformer is nominal. Gray transformer chemistry services direct evaluation the mechanical properties of insulating paper can be established by direct measurement of its tensile strength or degree of polymerization dp.
Why vector group of distribution transformer is dyn11. Explanation and vectorgroups schmidbauer transformers. A three phase transformer is one of the vital apparatus in the power systems. 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. Vector group in transformer pdf economical home lighting. In the previous eleven editions the publishers endeavoured to revise the work, extend it and to bring it up to date. The power transformer used to transfer the high voltage supply from one place to another. The business plan is based on capital cost recovery, depreciation rate and the profit to be made each year. Testing of power transformers routine tests, type tests and special tests. There is no technical difference between the one vector groups i. The only prerequisite for a successful test is to enter the proper vector group of the transformer under the test, so the device will use the proper algorithm. 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. Transformer vector group the vector group test is importent test in the transformer testing. The determination of vector group of transformers is very important before.
Transformer vector group connections are made based on the winding polarity. Vector group of transformers free download as powerpoint presentation. It also determines the high voltage and low voltage windings arrangement of three phase transformers. Transformer vecttransformer vector group test conditionsor group test conditions. Swedish neutral also offers five limb ynd open connected grounding transformers, suitable for neutral grounding of smaller industry grids. The following information is obtained from the vector diagram. We can test its vector group configuration after connecting the transformer like below image. The vector group of transformer is an essential property for successful parallel operation of transformers. Pdf transformer vector group test conditions k pandian. Transformer is the most important unit in an electrical distribution network. Description of vector group testing of vector group bangla tutorial for power point slide go to eee practical knowledge. The three phase transformer windings can be connected several ways. 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.
1276 1275 244 1162 792 331 866 1204 370 947 761 578 444 834 320 952 500 262 436 1090 669 836 394 622 1320 153 185 169 180 698 377 270 744