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Generally for export only transformer, generator side is connected in delta and load side is connected in star. For export import Transformers star star connection may be preferred by some since this avoids a grounding transformer on generator side and perhaps save on neutral insulation. I am not sure how correct this practice is but so many systems are running in this configuration. Perhaps it may be felt to be less harmful than operating delta system incorrectly. Yd or Dy connection is standard for all unit connected generators.
The main reasons for connecting generator side winding in delta are:
1) To facilitate grounding of generator system with higher impedance and the load system with lower impedance.
2)To break The zero sequence circuit for the system at the transformer. This ensures the load side zero sequence currents do not come to the generator system.
3) III rd and similar harmonics will circulate in delta and will not come to generator system.
The trafo vector group will be Dy if load voltage is lower and Yd if load side voltage is higher.
Dy1,5,7 or 11 selection depends on requirement for load synchronizing ,standardizing or ready trafo availability. All vector groups are functionally similar.
Wiki User
∙ 11y ago
Wiki User
∙ 11y agowe all know that vector group is needed for parallel operation. but my doubt is when we design a transformer and going to send the power to a grid what should be the connection of the transformer in generating side?
my answer is if the transmission line is a long transmission line, the current is lead. for that reason we are using reactor at the generating side for compensating capacitive effect and also we can compensate through transformer. like this....
let, my primary side is 24KV (Delta)and my sec. side is 220 KV (star) and my vector group is Ynd11. it means sec(star) side lag by an angle 30 deg. from primary(delta) side. so it will act as a reactor for compensating the effect of capacitor in long transmission line which helps we can use a smaller magnitude of reactor at generating side.
CommentAn interesting answer. However, the angular displacementor 'phase shift' between the primary and secondary side of the transformer refers to a displacement in line voltages, NOT between voltages and currents. So the simple answer is that we use the vector group information to determine whether a pair of three-phase transformers can, or cannot, be paralleld.
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What are the condition for checking vector group of YNd1 power transformer?
what is ynd1
Is there any relation with vector group of transformer with power factor?
yes there is
Why mentions the nameplat of transformer in vector group?
A transformer's 'nameplate' lists all the data necessary to identify the rating, connections, etc., of a transformer. Part of this data is the 'vector group' information which applies to three-phase transformers, and which, in simple terms, tells us whether or not the transformer can be connected in parallel with another.
Can a Dy11 vector group transformer be connected to a Yd1 vector group transformer source?
In series, yes. In parallel, nope! Putting a Yd1 transformer in series with a Dy11 transformer would result in the output of the Dy11 transformer being identical to the input of the Yd1 transformer with the exception of the voltage magnitude - this will change depending on the winding ratio's on both transformers. But, in regards to other properties of the voltage, the phases will in be in phase, with the voltage in-between the two transformers lagging by 30 degrees.
What is the significance of vector-grouping in Power Transformers?
Vector group of Transformer: a.)The three stage transformer windings can be joined a few ways. In light of the windings' association, the vector gathering of the transformer is resolved. b.)The transformer vector gathering is shown on the Name Plate of transformer by the producer. c.)The vector gathering shows the stage contrast between the essential and auxiliary sides, acquainted due with that specific setup of transformer windings association. d.)The Determination of vector gathering of transformers is imperative before uniting two or more transformers in parallel. On the off chance that two transformers of diverse vector gatherings are associated in parallel then stage distinction exist between the optional of the transformers and huge coursing current streams between the two transformers which is extremely impeding.
How do you test Yyn0 vector group of transformer?
in electrical engineering
What are the condition for checking vector group of YNd1 power transformer?
what is ynd1
Is there any relation with vector group of transformer with power factor?
yes there is
Why mentions the nameplat of transformer in vector group?
A transformer's 'nameplate' lists all the data necessary to identify the rating, connections, etc., of a transformer. Part of this data is the 'vector group' information which applies to three-phase transformers, and which, in simple terms, tells us whether or not the transformer can be connected in parallel with another.
What is a positive selection vector?
positive selection vector
What does dy1 means in a power transformer?
Dy1 means the vector group that is being used at a distribution system.
Can a Dy11 vector group transformer be connected to a Yd1 vector group transformer source?
In series, yes. In parallel, nope! Putting a Yd1 transformer in series with a Dy11 transformer would result in the output of the Dy11 transformer being identical to the input of the Yd1 transformer with the exception of the voltage magnitude - this will change depending on the winding ratio's on both transformers. But, in regards to other properties of the voltage, the phases will in be in phase, with the voltage in-between the two transformers lagging by 30 degrees.
What is the meaning of suffix YNaOd1 in vector group of transformer?
i understand that YNaOd1 represent an auto transformer with HV winding as wye connected and loaded tertiary. Please correct me if i am wrong.
Why generator transformer vector group is YNd1 or YNd11 with the generator connected to Delta side?
Vector groups are used to categorize high and low voltage in transformers. The group number identifies the phase angle between configurations.
Why is identification of the vector group of transformer important?
Vector group means it defines the primary & secondary side connection type of the transformer.For example DY says D for the delta connections (windings connected between two phases) & Y for the star connections (windings connected between two phases). That's why identification of the vector group of transformer is important.AnswerVector groups specify whether two or more three-phase transformers can be paralleled with each other. In order to do so, their angular displacements must be the same. Transformer connections listed in the Vector Group tables, categorise transformer connections in terms of their angular displacements.
What is the significance of vector-grouping in Power Transformers?
Vector group of Transformer: a.)The three stage transformer windings can be joined a few ways. In light of the windings' association, the vector gathering of the transformer is resolved. b.)The transformer vector gathering is shown on the Name Plate of transformer by the producer. c.)The vector gathering shows the stage contrast between the essential and auxiliary sides, acquainted due with that specific setup of transformer windings association. d.)The Determination of vector gathering of transformers is imperative before uniting two or more transformers in parallel. On the off chance that two transformers of diverse vector gatherings are associated in parallel then stage distinction exist between the optional of the transformers and huge coursing current streams between the two transformers which is extremely impeding.
Why excitation transformer vector group is only DY5?
This is basically to reduce the harmonics injected back in the grid which are generated because of the controller rectifier circuit (Thyristor Bridge - B6C) after the transformer secondary.
