Transformer VectTransformer Vector Group Test Conditionsor Group Test Conditions

Test Conditions for various vector groups commonly under use are listed along with pictorial representation. Assuming the reader has sufficient exposure to transformer winding connections.

Transformer Vector Group Test conditions YNd1, YNd11, Dyn11, YNyn0 and more Pandian

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Transformer Vector Group Test conditions

Index Chapter Cover page Index Introduction about Vector Group Notation Test Conditions for Ii0 & Ii6 Test Conditions for YNyn0 Test Conditions for N!n6 Test Conditions for #d0 Test Conditions for #d6 Test Conditions for Nd1 Test Conditions for Nd11 Test Conditions for #!n11 Test Conditions for #!n1

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Introduction In transformers the interconnection of the coils and the phase angle etween the primary and secondary side are denoted y standard form. Transf ormers with similar connections and phase shift are grouped under a !ector group. tandard notations to denote t'e connection are (isted be(o)

"! #inding

'! #inding

Connection $tar %elta Neutral &ig &ag $ingle Phase $tar %elta &ig &ag Neutral $ingle Phase

Notation Y % N & I

y d ( n i

The phase shift etween th e primary and secondary side are denoted in the form of Cloc) Position. Ta)ing "! side as the reference *i.e. +, o Cloc) position- phase shift of the '! side is mentioned in numerical values in multiples of 0/ 0 denotes 0/ + denotes 0/ 1 denotes +20/ and so on. In special transformer where the phase shift is not in multiples of 0/ particularly for the isolation transformer incorporated incorporated to reduce the harmonics directly the phase angle is een mentioned y the manufacturers To carry out the !ector 3roup test one should estalish the electrical connection connection etween Primary and $econdary since the separate winding transformers are inductively coupled whereas the auto transformers are electrically coupled and so no need for latter. After estalishing the electrical connection connection etween two windings under test voltage may e applied in either of the winding preferaly in the "! side as it is safe and the voltage measured etween the various terminals will e indicative indicative to ensure the phase shift. Testing 4ngineer should derive at least three conditions to compare add and or e5uate the particular set of voltage to e measured. These conditions should e in such way to ensure the phase shift and phase se5uence. 6sually +6 and ,u are connected ut it is not necessarily to e so Testing 4ngineer can choose y his7her own choice and the conditions shall e derived accordingly. If the derived conditions are satisfied the vector shall e confirmed.







Transformer Vector Group Test conditions +P

Ii0 

Connect +P and ,p



8eep the neutral*+N 9 ,n-l floating



Apply !oltage in "! side

,p

,n

+N Condition

+P 9 ,p

:easure !oltage etween V1P2n

+. +P and ,n *!+P,n -

,n

,. ,n and +N *!,n+N -

V1P1N

. +P and +N *!+P+N -

V1N2n

V1P2n + V2n1N = V1P1N

+N

Ii6

+P



Connect +P and ,p



8eep the neutral*+N 9 ,n-l floating



Apply !oltage in "! side

,n

,p

+N

Condition

:easure !oltage etween

,n V1P2n

+P 9 ,p

+. +P and ,n *!+P,n ,. ,n and +N *!,n+N -

V2n1N

. +P and +N *!+P+N V1P2n + V1P1N = V2n1N

V1P1N








YNyn0

+6 ,u



Connect +6 and ,u



8eep the neutral floating



Apply ; !oltage in "! side

,n ,w

,v

+N +#

+!

Condition – 1

:easure !oltage etween +69,u

+. +6 and ,n *!+6,n ,. ,n and +N *!,n+N -

V1U2n

V1U1N

. +6 and +N *!+6+N -

,n ,v

,w

V1U2n + V2n1N = V1U1N

V2n1N

+N +#

+!

Condition – 2


+69,u

+. +# and ,w * !+#,w -

,n

,. +! and ,v *!+!,v V1W2w = V1V2

V1W2w

,v

,w

V1V2v

+N +#

+!

Condition – !

:easure !oltage etween +69,u

+. +# and ,w *!+#,w ,. +# and ,v *!+!,v V1W2w

"

V1W2v

,n

V1w2

,v

,w V1W2w

+N








YNyn6 

Connect +6 and ,u







+6

,v

,u +N +#

+!

Condition – 1

,v :easure !oltage etween

,n

,w

V2n1U

+. +6 and ,n *!,n+6 -

+69 ,u

,. ,n and +N *!,n+N . +6 and +N *!+6+N -

V2n1N

V1U1N

V2n1U + V1U1N = V2n1N +N +#

+!

,v Condition – 2

,n

,w


+. +# and ,v * !+#,v ,. +! and ,w *!+!,w -

,n

+69 ,u V1W2v

V1V2w

V1W2 = V1V2w +N +#

+!

,w










YNyn6#*contd,v

,n

,w

Condition – !


+. +# and ,v *!+#,v -

+69 ,u

V1W2w

V1W2v

,. +# and ,w *!+w,w V1W2w

$

+N

V1w2 +#

+!

%

,v

+. +6 and ,u *!+6,u -

,w +69 ,n

V1U2u

,. ,u and +N *!,u+N -

,u

. +6 and +N *!+6+N -

V2u1N

V1U2u + V2u1N = V1U1N +N +#

V1W2w







Transformer Vector Group Test conditions +6

&d0

,u



Connect +6 and ,u




,w

+#

,v

+!

Condition – 1


+69,u

+. +6 and ,w *!+6,w ,. ,w and +# *!,w+# -

,v

,w

. +6 and +# *!+6+# V1U2w + V2w1W = V1U1W +#

+!

Condition – 2


+69,u

+. +6 and ,v *!+6,v ,. ,v and +! *!,v+! -

,w

,v

. +6 and +! *!+6+! V1U2 + V21V = V1U1V

Condition – !

+#

+!








&d6

+6



Connect +6 and ,u




,w

,v

,u +#

+!

Condition – 1

,v


+. +6 and ,w *!+6,w ,. ,w and +# *!+#,w -

,w

+69,u

V1U2w

V1W2w

. +6 and +# *!+6+# V1U1W + V1U2w = V1W2w +#

+!

Condition – 2

,v


+. +6 and ,v *!+6,v -

+69,u

,. ,v and +! *!+!,v . +6 and +! *!+6+! -

V1V2v

,w

V1U2v








&d6#*contdCondition – !

,v


+. +# and ,v *!+#,v -

+69,u

,. +# and ,w *!+w,w V1W2w

$

,w

V1W2w

V1w2

+#

+!

%







YNd1 

Connect +6 and ,u







+6

,u ,w ,v

+N +#

+!

Condition ' 1


+. +6 and ,v *!+6,v -

1U ( 2u V1U2v

2w 2

V1U1N

V2v1N

,. ,v and +N *!,v+N -

1N

. +6 and +N *!+6+N -

1V

1W

V1U2 + V21N = V1U1N

1U ( 2u

Condition – 2 2w


+. +# and ,w * !+#,w -

2 V1W2w

1N

,. +! and ,w *!+!,w V1W2w " V1V2w

V1V2w

1W

1V










YNd11 +6 

Connect +6 and ,u







,u ,v ,w

+N +#

+!

Condition ' 1 1U ( 2u


+. +6 and ,w *!+6,w ,. ,w and +N *!,w+N -

2w

Condition ' 2

V1U1N

V2w1N

. +6 and +N *!+6+N V1U2w + V2w1N = V1U1N

2

V1U2w

1N 1W

1V








&yn11 +6 

Connect +6 and ,u







,u

,n ,w +#

+!

+69 ,u

Condition ' 1


V1U2n

,n

,w

,. ,n and +! *!,n+! -

V1U2n + V2n1V = V1U1V

,v V2n1V

+. +6 and ,n *!+6,n . +6 and +! *!+6+! -

V1U1V

+#

+!

,v








&yn1 

Connect +6 and ,u







+6

,u

,w

,v +#

+!

Condition ' 1 V1U2n


+. +6 and ,n *!+6,n ,. ,n and +# *!,n+# . +6 and +# *!+6+# -

,n

V1U1W

+69,u ,n

,w V2n1W

,v +#

+!

V1U2n + V2n1W = V1U1W +69,u Condition ' 2

,n

V1V2v

Transformer VectTransformer Vector Group Test Conditionsor Group Test Conditions

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