Vector group test is done in order to know the phase displacement between the high voltage and low voltage winding. Transformer is the most important unit in an electrical distribution network. Swedish neutral also offers five limb ynd open connected grounding transformers, suitable for neutral grounding of smaller industry grids. Through vector group of a transformer we can know that the winding configuration of a transformer. Transformer connections from the same group can be.
The determination of vector group of transformers is very important before connecting two or more transformers in parallel. Significance of vector group of transformer on the nameplate of threephase transformer vector group is printed as yy 0, dd 1 etc. The vector group indicates the phase difference between the primary and secondary sides, introduced due to that particular configuration of transformer windings connection. This symbol indicates the winding connections and their relative phase displacement by means of a numerical index e. Assuming the reader has sufficient exposure to transformer winding connections. The harmonics in a transformer are present only in the transformer inrush current predominantly 2 nd harmonic content. In a 3 phas e transformer, it is essential to carry out a vector group test of transformer. Armstrong okai ababio electrical engineer electricity company of ghana c b a primary star equi. What is the meaning of transformer vector group yna0d1. Easy method for testing transformer differential relays. The naming convention popularly known as vector group of transformer was established by the international electrotechnical commission iec through iec 600761. Pdf performing transformer vector group test kamarul. From a vector group one can determine the phaseshift between primary and secondary. A grounding transformer with built in local power supply can be used as a local transformer.
Vector group test of power transformer electrical study. The transformer vector group show the phase difference between the primary and secondary sides of the transformer. Ensure the system is isolated or not and remove the earthing from the system. Windings can be connected as delta, star, or interconnec. Measure the voltages in various combination on both side of the transformer hv lv. Dv power manufactures the most advanced testing solutions for electrical energy systems. This is due to improvements in materials, accurate design analysis with advanced mathematics, computers and better.
It is likely that the voltage in the tertiary winding is lv, hence d11 not d11. 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. The three phase transformer windings can be connected several ways. This was done in order to create a notation for threephase transformer winding configuration. The transformer vector group is indicated on the name plate of transformer by the manufacturer. We can test its vector group configuration after connecting the transformer like below image. As clearly shown above, there are six vector group options available for star star transformer configuration. Autotransformer vector group cr4 discussion thread.
The clock method is used to produce the numerical index of. All transformers are subjected to various tests at the manufacturer. To understand the nature of ratio testing it is important to understand the applicable definitions. Vector group of 3phase transformer electrical concepts. 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. It also determines the high voltage and low voltage windings arrangement of three phase transformers. 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 neutral was solidly connected to the earthing mat. For a functionally identical new transformer, losses, weight and dimensions are often much lower than those of the old transformer. Vector groups identify the winding connections and polarities of the primary and secondary. Pdf transformer testing type test and routine test of. Transformer vector group free download as powerpoint presentation.
In intcv205 transformer vector group applications english pdf course description uk abb university uk training schedule english pdf information transformer service brochure english pdf brochure trafoasset management brochure english pdf brochure power products services retrofit, modernization and service. I have faceting problem in testing of transformer vector group dy11y11y11y11,380vx433000v for solar plant i have ask to client for factory. The vector group transformer test is important for connecting two power transformer in parallel. Pdf easy method for testing transformer differential relays. It consists of a capital and small letter plus a code number. This is generally not a problem for iec based transformers. Vector group test of transformer testing of transformer. Dy connection y winding nullifies 3rd harmonics, preventing it to be reflected on delta side. In auto transformer two windings are not only magnetically.
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. First, connect the test power supply to high voltage winding. A vector group is a method of specifying a threephase transformer or transformer bank method of connection and its angular displacement. This cannot be avoided by selecting a tansformer with a particular vector group. Department of electrical and electronics engineering. Training on vector groups of transformer presented by. Performing transformer vector group test prepared by ir kamarul ariffin yahya uptp27 lead electrical engineer p27 amt supervisor.
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 the vector group test is importent test in the transformer testing. Liggett group llc tobacco and new valley llc real estate, including douglas elliman. Aim of vector group test is at site is to check if their is any damage in the windings during transportation and erection. When an old singlephase transformer fails, it is often replaced with a new singlephase transformer. One procedure of vector group testing of transformer is explained as below.
Vector group test of transformer is done for detecting the vector group. Here yy 0 will mean its both the windings are starconnected and phase displacement between primary and secondary emfs is zero. 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. Testing of power transformers routine tests, type tests and special tests. Hence every electrical power transformer must undergo through vector group test of transformer at factory site for ensuring the customer specified vector group of. In other words, the vector group gives information about the connection of the tertiary winding. Transformer vector group test conditions ynd1, ynd11, dyn11, ynyn0 and. Hence every electrical power transformer must undergo through vector group test of transformer at factory site for ensuring the customer. An ordinary transformer consists of two windings called primary winding and secondary winding. Transformer, voltage ratio, vector group, impedance, shortwhat is vector group. Transformer vector group connections are made based on the winding polarity. On the name plate of a three phase transformer, the. 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. Transformer testing type tests and routine tests of.
The voltage ratio of a transformer is the ratio of the rms terminal voltage of a. Service we provide 3 years of warranty for our instruments and 10 years of spare parts availability. If we want to connect two transformer in parallel then their phase shift should be same, otherwise there will be a. Pdf transformer vector group test conditions k pandian. Different grounding transformers vector group zn vector group ynd open five limb. But because of high resistance of earthing mat ohm on lv and 180 ohm on hv, one day lv side neutral earthing conductor melted and we had a huge damage. The vector group test is importent test in the transformer testing.
Applicationnote how to determine transformer vector group. Dv power qualified engineers will gladly assist you during measurements or answer your technical questions from different areas of the electrical power market. Vector group test of power transformer electrical mastar. The result is a very large thirdharmonic component of. These two windings are magnetically coupled and electrically isolated. Transformer vecttransformer vector group test conditionsor group test conditions free download as pdf file. Vector groups are the iec method of categorizing the primary and secondary winding configurations of 3phase transformers. The connection of all the windings in a threephase transformer is indicated by a vector group symbol.
Vector group test of transformerthe vector group of transformer is an essential property for successful parallel operation of transformers. Vector group is punched on the name plate based on the user requirement by the manufacture. Transformer testing type test and routine test of transformer electrical4u. Transformer vecttransformer vector group test conditionsor group. Vector group of 3 winding transformer cr4 discussion thread. I have faceting problem in testing of transformer vector group dy11y11y11y11, 380vx433000v for solar plant i have ask to client for factory. These tests are done when the tap of transformer is nominal. Vector group test, check the voltage phase shift of two or more transformer. The high voltage terminal h 1 is connected to the low voltage terminal x 1.
There are several internal connections of threephase transformer are available on the market. Howard lorber has served as the companys president and chief executive officer since 1994. Description of vector group testing of vector group bangla tutorial for power point slide go to eee practical knowledge. The vector group of transformer is an essential property for successful parallel operation of transformers. Proper vector grouping in a transformer is an essential criteria for parallel operation of transformers. 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. What is the test procedure of vector group of a transformer having. Secondary star options of naming transformer secondary a b c b a c c b a a aa a a a 6 2 10 17. Our products can be found and are in use in more than 90 countries. Dv power smart test instruments for reliable electrical.
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