For example, a step-up transformer with a delta-connected primary, and star- connected secondary, is not written as ‘dY11’, but ‘Yd11’. The As different combinations of winding connections will result in different phase angles between the voltages on the windings, transformers connected in parallel . classic distribution transformers for electric power supply. Oil and gas . Dy11– 20°. 1 x (Dy5 Dd0). +°. 1 x (Dy5 Dd0). –°. 1 x (Dy11–10° Dy Dy11–10°) .

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The voltages will either be in-phase or displaced by deg. February 21, at 2: Very good transrormer, but one question rises: September 3, at 8: This means that a 3-phase transformer can have its primary and secondary windings connected the same delta-delta or star-staror differently delta-star or star-delta.

September 29, at 6: Articles needing additional references from January All articles needing additional references.

Vector Group of Transformer

In star-star transformer how can we do vector group test?? April 13, at Both windings are Star. Add a review and help 80 Lakhs JobBuzz users to take better career decision. When two coil have opposite winding direction than Voltage induced in both coil are in opposite direction.

Means more load is sometime on R phasesometimes on Y phase and so on. Please fix these I have had two people this week give me wrong vector diagrams because they copied your errors.

Vector group

Likewise, earth fault protection on the primary side is not affected by earth faults on the secondary side. By using this site, you agree to the Terms of Use and Privacy Policy.


Thus, the yn side of the transformer is a ‘separately derived system’ in which all earth fault current must flow through the neutral of this transformer.

We have a DYN5 Transformer which is used as a step down transformer August 15, at This page was last edited on 30 Aprilat The vector group designation indicates the windings configurations and the difference in phase angle between them.

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June 12, at 4: Hi Jignesh What would be the effects on the Zigzag neutral current during normal system operation, if the voltages are severely unbalanced due transormer load unbalancing on the power system feeders?

So can we suggest to the client for YNd October 11, at 9: Should not be the polarity always same? August 14, at 3: This position is always the reference point.

If You find this content in any other site,it makes the page you are viewing an infringement of the copyright. Husnain Jan 16, November 4, at 4: An AC voltage applied to a coil will induce a voltage in a second coil where the two are linked by a magnetic path. Sir what in the mean of Lio vector group and why we can you the other vector group in place of this vector group. In such case the GSU vector group will change or not.


By continuing to use this website, you agree to transforer use. This is the far best explanation of vector group meaning and usage! Phase rotation is always anti-clockwise.

Vector group – Wikipedia

For example, a transformer with a vector group of Dy1 has a delta-connected HV winding and a wye-connected LV winding. Leave a Comment Click here to cancel reply. Gujarat Gas Co Ltd.

Electrolytic capacitors also connected across DC to minimize ripple voltage. Any specific reason for that? Does the downstream transformer vektor groups have an trnsformer on fault currents. This is called a 30 degree phase shift. May 7, at 5: Yd11 in terms of performance.

What is meant by vector group for transformers and why is it important?

Generally we use Delta — Star Transformer Dyn Jignesh Sir, Thank u for good information. June transsformer, at 5: March 12, at 3: The phase relationship of the two voltages depends upon which way round the coils are connected. Because Generating Transformer are YNd1 for neutralizing the load angle between 11 and 1. Sir, As you said: In the system adopted by the IEC, the vector group is indicated by a code consisting of two or three letters, followed by one or two numeric transvormer.