Transformer vector group connections are made based on the winding polarity. The three phase transformer primary and secondary windings are mainly connected in the following ways. Resibloc transformers are produced in full compliance with din en iso 9001, din en iso 14001 and bs ohsas 18001 standards. The procedure of the transformer ratio test is simple. However, im not sure on what side of the transformer i. Power transformer testing power transformer factory test using ieee standards waldemar ziomek cg power systems canada ieee training, houston, texas, oct. 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.
This paper provides an alternate method for testing transformer differential relays applied to delta. Transformer what is the meaning of dyn11 in a transformer. Transformer has a delta connected primary winding d a star connected secondary y with the star point brought out n. Most of the distribution sides transformers are deltastar connected 4. Transformers are an electrical component that transmit electrical energy between at least two circuits. Introduction to the delta wye transformer connection part 7d. Change taps on primary or secondary side of transformer. Testing of three phase power transformer ijireeice. I read on here that a typicall us delta wye transformer is a dyn1 with the secondary line to line voltage lagging the primary side line voltage by 30 degrees.
Type of cooling onan onan the voltage level can be specified as 415240 v400230 v volts as per the requirements of the purchaser. I have faceting problem in testing of transformer vector group dy11y11y11y11,380vx433000v for solar plant i have ask to client for factory test report. Transformers working in parallel should have equal shortcircuit impedance. Resibloc transformers are nonexplosive with high resistance to flame and do not require vaults, containment dikes, or costly fire suppression systems. Transformer anura perera, paul keller system operator eskom transmission introduction during the design phase of new protection schemes to be used in the eskom network, model power system mps testing of the ieds are conducted to verify that the ieds are. In this paper testing of distribution transformer is considered. 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. Both the following ratiometer connections are correct for vector connection dyn11, except that whatever. Scribd is the worlds largest social reading and publishing site. The base or the platform for the storage of the transformers must be sufficiently resistant as to withstand its weight and be perfectly flat. Transformers regulate the voltage in circuits, but in some cases these can go bad and cause a circuit to not. Power transformer factory test using ieee standards. Vector group test of transformerthe vector group of transformer is an essential property for successful parallel operation of transformers.
Interpretation of sweep frequency response analysis sfra. Why vector group of distribution transformer is dyn11. It evolved from the simple gonogo verdict into a sophisticated segment within transformer manufacturing. Transformer testing dyn11 transformer power electronics scribd. Transformer testing has developed considerably over the past years. Dyn11 delta connected hv, star connected lv with neutral out and lv leads hv by 30 degrees. The alternate method is based on the transformer three. The transformers to be used outdoors must be stored whenever possible indoors. So for ensuring proper performance of electrical power transformer, voltage and turn ratio test of transformer one of the important tests. Testing of power transformers seems like a similar experience. The first one is to introduce types of shortcircuits. Transformer vector group dyn11 and dyn1 physics forums. The secondary side of a distribution transformer must be yn.
A dyn11 for example indicates that the lv leads the hv by. It is the nature of delta and star connections and there is no specific intention to use this vector group. Pdf transformer vector group test conditions k pandian. So transformer ratio test is an essential type test of transformer. The power transformer of rating 10 kva, 1 v440 v, 3phase, 50 hz, dyn11 has been specially developed inhouse for carrying out sfra testing by. Through vector group of a transformer we can know that the winding configuration of a transformer. The dac connection is characterized by line currents lagging the phase currents by 30. Transformer short circuit current calculation and solutions. Transformer vector group test procedure lfqx419apgo 2. Transformer testing type tests and routine tests of.
Due to high loading, i want to change the tap settings to either 0. Knowing the type of delta connection is very helpful in understanding the vector groups dyn1, dyn11, ynd1, and ynd11. For the love of physics walter lewin may 16, 2011 duration. Audible sound levels decibels at rated voltage and frequency for liquid immersed distribution transformers shall be as below nema standards. Threephase transformer connections and vector groups for. A dyn11 for example indicates that the lv leads the hv by 30, therefore the hv winding should be dac connected. I have a 5500380v dyn11 transformer, with possible tap settings of 0. Threephase transformer connections and vector groups for beginners photo credit. The ecodesign directive of the european union and the related regulation 5482014 for transformer losses requires manufacturers to publish on the internet information on rated power, load loss, noload loss and weight and type of the major components of typical transformers, which are. Transformer short circuit current calculation and solutions date number of pages appendices 14 june 20 31 pages 0 page summary there are three goals for the thesis. In theory a threephase transformer works like three separate singlephase transformers with shared limbs in which the magnetic circuit for the outer limbs is longer than for the centre limb. If the transformer is going to be stored outdoors, make sure that the area for storage has a good drainage system.
In manual method, lot of time is required to test any type of transformer and risk involved is higher. The test methods used by the authors for presenting the results are described. But after the winding connection is made it is necessary to check if the desired vector group has been achieved. Vector group test of power transformer electrical4u.
Transformer testing dyn11 free download as pdf file. Vector group is punched on the name plate based on the user requirement by the manufacture. 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. If two transformers of different vector groups are connected in parallel then phase difference exist between the secondaries of the transformers and large circulating current flows between the two transformers which is very detrimental. Testing of any electrical equipment indicates the extent to which the equipment is able to comply with a customers requirements. Dyn11 vector group has better performance on the mitigation of voltage sags during unbalanced faults compared to dyn1. In this book we have laid down important aspects on transformer. Aim of vector group test is at site is to check if their is any damage in the windings. In this paper, various intelligence techniques are used to test. Transformer testing dyn11 transformer power electronics. The swer isolating transformer is a medium voltage phase to phase connected winding and a 19kv secondary winding for swer application. So a vector group dyn11 is delta on primary, star on secondary, with neutral brought out and 330 degrees phase displacement. It means lv winding,which is star connected written in small letters means lv. Manufacturers test thousands of distribution transformers at worldwide locations each week.
What is the test procedure of vector group of a transformer having. The secondary side of a distribution transformer must be yn or zn to. Schematic diagram of a threephase transformer the threephase transformer. The material resin is a material of immense strength. The impedance voltage at normal tap shall be 4% for transformers up to 300kva, 5% for. Transformer r ype i illed morphou llo ore 3 tgood produces transformers for over 5000 prefabricated substation and switchgear units annually key benefits product overview dry type, oil filled, amorphous alloy core, and padmount transformers. Modern transformers are designed to closer tolerances than transformers in the past. This test also performed as a routine test of transformer. Transformer book is still in demand is a tribute to the publishers and to the.