Transformer Impedance Calculation Sheet

Transformer Sequence Impedance Test Sheets Substation:

New Zakher Grid

Transformer ratin#

90/120 MVA

Transformer !:

T201

Vo"ta#e $e%e"

&rimar'

!ate:

2)*+eb*1,

220

Se(ondar' kV

-).

kV

Tests To Determine The Equivalent Positive Sequence Impedanc a.

The The tes testt is is don done e b' b' kee keei in# n# the the $V $V Sid Side e Sho Short rt ir( ir(ui uite ted d and and V Side Side is su su" "ie ied d wit with h - ha hase se )00V )00V A Su Su"' "'..

b.

The te test ha ha%e be been (a (arried ou out fo for No Nomina ina" Ta Ta3 i# i#h hest an and $o $owest TA TA& HV

Ea

~

LV

Test 1:

A

Eb

Ec

T

~

A

~

A

Tap Position

Volta#e $pplied %V&

1

2-4.)

11

229.,

2

224.9


New Zakher Grid

Transformer ratin#

90/120 MVA

Transformer !:

T201

Vo"ta#e $e%e"

&rimar'

!ate:

2)*+eb*1,

220

Se(ondar' kV

-).

kV

Tests To Determine The Equivalent 'ero Sequence Impedance a.

The test is (arried out b' su"'in# a (urrent (urrent of rated fre5uen(' between between ara""e" (onne(ted (onne(ted hase termina"s and the neutr (urrent.

b.

The %arious ases of Tests ha%e been ro%ided be"ow

"ase 1:- HV Supplied/ V (pen "ircuited/ Tertiar! "losed HV

T

LV

Test 1:

A

A

Tap Position

Volta#e $pplied %V&

1

2-1.9

11

2--.9


New Zakher Grid

Transformer ratin#

90/120 MVA

Transformer !:

T201

Vo"ta#e $e%e"

&rimar'

!ate:

2)*+eb*1,

220

A V

Se(ondar' kV

-).

kV

1-8

2--.

2

224.9

"ase ):- HV Supplied/ V Short "ircuited/ Tertiar! "losed HV

T

LV

Test ):

A

A

A V

Tap Position

Volta#e $pplied %V&

1

2-2.4

11

2-2.2

1-8

2-2

2

229.4


The test is (arried out b' su"'in# a (urrent (urrent of rated fre5uen(' between between ara""e" (onne(ted (onne(ted hase termina"s and the neutr (urrent.


New Zakher Grid

Transformer ratin#

90/120 MVA

Transformer !:

T201

Vo"ta#e $e%e"

&rimar'

!ate:

2)*+eb*1, b.

220

Se(ondar' kV

-).

kV


"ase *:- V Supplied/ HV Short "ircuited/ Tertiar! "losed LV

T

HV

Test *:

A

A

A V

Tap Position

Volta#e $pplied %V&

1

.1-

11

.)-

1-8

.,

2

.2

"ase *:- V Supplied/ HV (pen "ircuited/ Tertiar! "losed LV

T

HV

Test 1:

A

A

Tap Position

Volta#e $pplied %V&

1

.9


New Zakher Grid

Transformer ratin#

90/120 MVA

Transformer !:

T201

Vo"ta#e $e%e"

&rimar'

!ate:

2)*+eb*1,

220

Se(ondar' kV

-).

kV

A V

"alculation To Determine The Equivalent 'ero Sequence Impedance at HV+ V an ZT

medan(e Measured in &rimar' (ir(uit with Teritar' Shorted and Se(ondar' 7en



Z$T

medan(e measured in Se(ondar' ir(uit with Teritar' Shorted and &rimar' 7en



Z$T

medan(e Measured in &rimar' (ir(uit with Teritar' Shorted and Se(ondar' Shorted



Z$T

medan(e Measured in Se(ondar' (ir(uit with Teritar' Shorted and &rimar' Shorted



Z

&rimar' medan(e



ZT*ZT



Z$

Se(ondar' medan(e



Z$T*ZT



ZT

Tertiar' medan(e



S;=Z$T*Z$T??



Tertiar' 9.9

kV

- HV Supplied/ V Short cicuited/ Tertiar! "losed "urrent easured %$&

Impedance "alculated %Ω&

V$ .ase

 of 1)0V$ .ase

1.41

1-1.21

120

2.1

2.-)

94.12

120

2).-)

-.99

,-.,0

120

2-.19

Tertiar' 9.9

kV

" termina". t is e6ressed in 7hms and is #i%en b' - times test %o"ta#e/test

- HV Supplied/ V (pen cicuited/ Tertiar! "losed "urrent easured %$&


V$ .ase

'ero Sequence Impedance 

.42

44.9,

120

10.0,

10.,

,.49

120

9.)-

Tertiar' 9.9

kV

11.-

,2.0)

120

9.-)

1,.2

)2.-9

120

4.92



V$ .ase


.4

49.)

120

10.1-

10.2

,,.22

120

9.)4

11.1

,2.-1

120

9.-4

1,.2)

)2.)

120

4.9-


Tertiar' 9.9

kV

- V Supplied/ HV Short cicuited/ Tertiar! "losed "urrent easured %$&


V$ .ase


19.4

0.4

120

).1

21.2

0.,

120

).)1

22

0.

120

).0

21.)

0.

120

).0

- V Supplied/ HV (pen cicuited/ Tertiar! "losed "urrent easured %$&


V$ .ase


21.1

0.

120

).0

Tertiar' 9.9

kV

Tertiar! ,indin# ,.49 % 0. %

,).44

*0.2)

,,.22 %



$

0., %

1.01

,).44 %

T

*0.2) % 1.01 %


New Zakher Grid

Transformer ratin#

90/120 MVA

Transformer !:

T202

Vo"ta#e $e%e"

&rimar'

!ate:

2)*+eb*1,

220

Se(ondar' kV

-).

kV


The test is done b' keein# the $V Side Short ir(uited and V Side is su"ied with - hase )00V A Su"'.

b.

The test ha%e been (arried out for Nomina" Ta3 i#hest and $owest TA& HV

Ea

~

LV

Test 1:

A

Eb

Ec

T

~

A

~

A

Tap Position

Volta#e $pplied %V&

1

224.,

11

229.,

2

224.9


New Zakher Grid

Transformer ratin#

90/120 MVA

Transformer !:

T202

Vo"ta#e $e%e"

&rimar'

!ate:

2)*+eb*1,

220

Se(ondar' kV

-).

kV


The test is (arried out b' su"'in# a (urrent of rated fre5uen(' between ara""e" (onne(ted hase termina"s and the neutr (urrent.

b.



T

LV

Test 1:

A

A

Tap Position

Volta#e $pplied %V&

1

214.

11

21.4


New Zakher Grid

Transformer ratin#

90/120 MVA

Transformer !:

T202

Vo"ta#e $e%e"

&rimar'

!ate:

2)*+eb*1,

220

A V

Se(ondar' kV

-).

kV

1-8

21,.

2

21,


T

LV

Test ):

A

A

A V

Tap Position

Volta#e $pplied %V&

1

21.-

11

21

1-8

21,.

2

21.




New Zakher Grid

Transformer ratin#

90/120 MVA

Transformer !:

T202

Vo"ta#e $e%e"

&rimar'

!ate:

2)*+eb*1, b.

220

Se(ondar' kV

-).

kV



T

HV

Test *:

A

A

A V

Tap Position

Volta#e $pplied %V&

1

.,91

11

.,)

1-8

.,,

2

.,02


T

HV

Test 1:

A

A

Tap Position

Volta#e $pplied %V&

1

.


New Zakher Grid

Transformer ratin#

90/120 MVA

Transformer !:

T202

Vo"ta#e $e%e"

&rimar'

!ate:

2)*+eb*1,

220

Se(ondar' kV

-).

kV

A V





Z$T




Z$T




Z$T




Z




ZT*ZT



Z$




Z$T*ZT



ZT




S;=Z$T*Z$T??



Tertiar' 9.9

kV



V$ .ase

 of 1)0V$ .ase

1.)

1-0.4

120

2.,)

2.-)

94.12

120

2).--

-.99

,-.,0

120

2-.1,

Tertiar' 9.9

kV




V$ .ase


.-

49.2

120

10.10

9.42

,.9-

120

9.))

Tertiar' 9.9

kV

10.

,1.4,

120

9.-1

1.-1

)2.--

120

4.90



V$ .ase


.-2

49.0,

120

10.0

9.9-

,.,

120

9.-4

10.2

,1.40

120

9.-1

1.-)

)2.14

120

4.4


Tertiar' 9.9

kV



V$ .ase


21.1

0.41

120

).,9

20.4)

0.42

120

).

20.41

0.42

120

).

20.99

0.40

120

).,,



V$ .ase


21.--

0.40

120

).,

Tertiar' 9.9

kV

Tertiar! ,indin# ,.9- % 0.40 %

,.-4

0.2,

,., %



$

0.42 %

0.)

,.-4 %

T

0.2, % 0.) %


New Zakher Grid

Transformer ratin#

90/120 MVA

Transformer !:

T20-

Vo"ta#e $e%e"

&rimar'

!ate:

2)*+eb*1,

220

Se(ondar' kV

-).

kV


The test is done b' keein# the $V Side Short ir(uited and V Side is su"ied with - hase )00V A Su"'.

b.

The test ha%e been (arried out for Nomina" Ta3 i#hest and $owest TA& HV

Ea

~

LV

Test 1:

A

Eb

Ec

T

~

A

~

A

Tap Position

Volta#e $pplied %V&

1

2)0.9

11

2-9.

2

2-9.2


New Zakher Grid

Transformer ratin#

90/120 MVA

Transformer !:

T20-

Vo"ta#e $e%e"

&rimar'

!ate:

2)*+eb*1,

220

Se(ondar' kV

-).

kV



b.



T

LV

Test 1:

A

A

Tap Position

Volta#e $pplied %V&

1

2--.9

11

2-2.2


New Zakher Grid

Transformer ratin#

90/120 MVA

Transformer !:

T20-

Vo"ta#e $e%e"

&rimar'

!ate:

2)*+eb*1,

220

A V

Se(ondar' kV

-).

kV

1-8

2-2.4

2

2-0.9


T

LV

Test ):

A

A

A V

Tap Position

Volta#e $pplied %V&

1

2-).

11

2-2.9

1-8

2-2.9

2

2--.4




New Zakher Grid

Transformer ratin#

90/120 MVA

Transformer !:

T20-

Vo"ta#e $e%e"

&rimar'

!ate:

2)*+eb*1, b.

220

Se(ondar' kV

-).

kV



T

HV

Test *:

A

A

A V

Tap Position

Volta#e $pplied %V&

1

.

11

.)

1-8

.,

2

.


T

HV

Test 1:

A

A

Tap Position

Volta#e $pplied %V&

1

.,


New Zakher Grid

Transformer ratin#

90/120 MVA

Transformer !:

T20-

Vo"ta#e $e%e"

&rimar'

!ate:

2)*+eb*1,

220

Se(ondar' kV

-).

kV

A V





Z$T




Z$T




Z$T




Z




ZT*ZT



Z$




Z$T*ZT



ZT




S;=Z$T*Z$T??



Tertiar' 9.9

kV



V$ .ase

 of 1)0V$ .ase

1.4)9

1-0.29

120

2.1

2.)1

9.40

120

2).-)

-.4

,-.-1

120

2-.19

Tertiar' 9.9

kV




V$ .ase


.9-

44.)9

120

10.01

10.,)

,.)

120

9.-

Tertiar' 9.9

kV

11.-2

,1.0

120

9.29

1,.)

)2.2)

120

4.44



V$ .ase


.92

44.4-

120

10.0

10.,

,.,1

120

9.-9

11.-

,1.4-

120

9.-1

1,.,2

)2.20

120

4.44


Tertiar' 9.9

kV



V$ .ase


21.14

0.4

120

).-

20.4

0.9

120

).4

21.,

0.4

120

).2

21.)

0.9

120

).4



V$ .ase


21.2

0.9

120

).,0

Transformer Impedance Calculation Sheet

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