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°) .
|Published (Last):||8 November 2017|
|PDF File Size:||10.5 Mb|
|ePub File Size:||16.89 Mb|
|Price:||Free* [*Free Regsitration Required]|
The only factor affecting the choice between one or the other is system phasing, i. I think clock — wise is correct. Dd0 no phase displacement between HV and LV. Aqeel Sep 02, It is a 3 phase transformer with 6 secondary windings.
I have one straight but not so simple question. October 28, at 6: Add a review and help 80 Lakhs JobBuzz users to take better career decision. Saha Feb 03, S Srinivasan Jan 03, If not then why. October 24, at 8: 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 digits.
Post was not sent – check your email addresses!
Vector Group of Transformer
This article needs additional citations for verification. In this modern times is it need for sending power both ways in a transfomer. December 2, at 4: If unbalancing pattern is always same phase wise then it will be easy to balance by withdrawing single phase load from R and putting it on B phase.
Change Password Type your new password here mandatory! The positive effect and other characteristics of transformers of certain vector groups on the mitigation of voltage sags.
From the Vector group YznII of a particular transformer, how would you know that the Ratio test on the HV side of a transformer has failed? June 13, at 5: The primary windings are connected in one of several ways. August 13, at 1: Will the vectors change from Dyn11 to Yd1 depending of the power direction? Transformer has a delta connected primary winding D a star connected secondary y with the star point brought out n and a phase shift of 30 deg leading April 23, at 7: December 12, at 8: Articles needing additional references from January All articles needing additional references.
The letters indicate the winding configuration as follows:. March 27, at 5: This info is realy useful because the connections of vector groups r confusing me very much but now i understand.
June 1, at 5: Facebook Linkedin Google Plus Twitter. Amorphous metal transformer Austin transformer Autotransformer Buck—boost transformer Capacitor voltage transformer Distribution transformer Delta-wye transformer Energy efficient transformer Flyback transformer Grounding transformer Instrument transformer Current transformer Potential transformer Isolation transformer Linear variable differential transformer Pad-mounted transformer Parametric transformer Planar transformers Rotary transformer Rotary variable differential transformer Scott-T transformer Solid-state transformer Trigger transformer Variable-frequency transformer Zigzag transformer.
Use the hour indicator as the indicating phase displacement angle.
Vector Group of Transformer | Electrical Notes & Articles
In transofrmer three-phase power system, it may be necessary to connect a three-wire system to a four-wire system, or vice versa. January 4, at In star-star transformer how can we do vector group test??
As you know the distribution system normally on HV side connected in parallel and LV side radial. Now i am thinking to order a new oil transformer of Dy11y11 configuration. Dear jignesh brother, Your electrical notes are very transrormer helpful.
Paralleling typically occurs when transformers are located at one site and connected to a common bus bar banked or located at different sites with the secondary terminals connected via distribution or transmission circuits consisting of cables and overhead lines.