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.

Th The e tes testt is is d don one eb b' 'k kee eei in# n# th the e$ $V VS Sid ide eS Sho hort rt ir( ir(ui uite ted da and nd V Side Side is s su u" "ie ied dw wit ith h- ha hase se )0 )00V 0V A Su Su"' "'..

b.

The tte est h ha a%e b be een ( (a arried o ou ut ffo or N No omina ina" T Ta a3  i# i#h hest a an nd $ $o owest TA TA& HV

Ea

~

LV

Test 1:

A

Eb

Ec

 T

~

A

~

A

 Transfor  Transformer mer Sequence Sequence Impedance Impedance Test Sheets  

Tap Position

Volta#e $pplied %V&

1

2-4.)

11

229.,

2

224.9

 

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 'ero Sequence Impedance a.

The test is (arried out b' su"'in# a (urr (urrent ent of rated fre5uen(' bet between ween ara""e" (onne(te (onne(ted d 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

 Transfor  Transformer mer Sequence Sequence Impedance Impedance Test Sheets  

Tap Position

Volta#e $pplied %V&

1

2-1.9

11

2--.9

 

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

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

Tests To Determine The Equivalent 'ero Sequence Impedance a.

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

 Transfor  Transformer mer Sequence Sequence Impedance Impedance Test Sheets  

 

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, b.

220

Se(ondar' kV

-).

kV

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

"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

 Transfor  Transformer mer Sequence Sequence Impedance Impedance Test Sheets  

Tap Position

Volta#e $pplied %V&

1

.9

 

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

A V

"alculation To To Determine The Equiv Equivalent alent 'ero Sequence Imped Impedance ance at HV 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??



 Transfor  Transformer mer Sequence Sequence Impedance Impedance Test Sheets  

 

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

 Transfor  Transformer mer Sequence Sequence Impedance Impedance Test Sheets

   

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 %$&

Impedance "alculated %Ω&

V$ .ase

'ero Sequence Impedance 

.42 10.,

44.9, ,.49

120 120

10.0, 9.)-

 Transfor  Transformer mer Sequence Sequence Impedance Impedance Test Sheets

   

Tertiar' 9.9

kV

11.-

,2.0)

120

9.-)

1,.2

)2.-9

120

4.92

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

Impedance "alculated %Ω&

V$ .ase

'ero Sequence Impedance 

.4

49.)

120

10.1-

10.2 11.1

,,.22 ,2.-1

120 120

9.)4 9.-4

1,.2)

)2.)

120

4.9-

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

 Transfor  Transformer mer Sequence Sequence Impedance Impedance Test Sheets

   

Tertiar' 9.9

kV

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

Impedance "alculated %Ω&

V$ .ase

'ero Sequence Impedance 

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 %$&

Impedance "alculated %Ω&

V$ .ase

'ero Sequence Impedance 

21.1

0.

120

).0

 Transfor  Transformer mer Sequence Sequence Impedance Impedance Test Sheets

   

Tertiar' 9.9

kV

 Tertiar! ,indin# ,.49 % 0. %

,).44

*0.2)

,,.22 %



$

0., %

1.01

,).44 %

T

*0.2) % 1.01 %

 Transfor  Transformer mer Sequence Sequence Impedance Impedance Test Sheets

   

Transformer Sequence Impedance Test Sheets Substation:

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

Tests To Determine The Equivalent Positive Sequence Impedanc a.

Th The e tes testt is is d don one eb b' 'k kee eei in# n# th the e$ $V VS Sid ide eS Sho hort rt ir( ir(ui uite ted da and nd V Side Side is s su u" "ie ied dw wit ith h- ha hase se )0 )00V 0V A Su Su"' "'..

b.

The tte est h ha a%e b be een ( (a arried o ou ut ffo or N No omina ina" T Ta a3  i# i#h hest a an nd $ $o owest TA TA& HV

Ea

~

LV

Test 1:

A

Eb

Ec

 T

~

A

~

A

 Transfor  Transformer mer Sequence Sequence Impedance Impedance Test Sheets

Tap Position

Volta#e $pplied %V&

1

224.,

11

229.,

2

224.9

   

Transformer Sequence Impedance Test Sheets Substation:

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

Tests To Determine The Equivalent 'ero Sequence Impedance a.

The test is (arried out b' su"'in# a (urr (urrent ent of rated fre5uen(' bet between ween ara""e" (onne(te (onne(ted d 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

Tap Position

Volta#e $pplied %V&

1 11

214. 21.4

A

 Transfor  Transformer mer Sequence Sequence Impedance Impedance Test Sheets

   

Transformer Sequence Impedance Test Sheets Substation:

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,

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

 T

LV

Test ):

A

A

A V

Tap Position

Volta#e $pplied %V&

1

21.-

11 1-8

21 21,.

2

21.

Tests To Determine The Equivalent 'ero Sequence Impedance a.

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

 Transfor  Transformer mer Sequence Sequence Impedance Impedance Test Sheets

   

Transformer Sequence Impedance Test Sheets Substation:

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

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

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

 T

HV

Test *:

A

A

A V

Tap Position

Volta#e $pplied %V&

1

.,91

11

.,)

1-8

.,,

2

.,02

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

 T

HV

Test 1:

A

A

 Transfor  Transformer mer Sequence Sequence Impedance Impedance Test Sheets

Tap Position

Volta#e $pplied %V&

1

.

   

Transformer Sequence Impedance Test Sheets Substation:

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

"alculation To To Determine The Equiv Equivalent alent 'ero Sequence Imped Impedance ance at HV 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??



 Transfor  Transformer mer Sequence Sequence Impedance Impedance Test Sheets

   

Tertiar' 9.9

kV

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

Impedance "alculated %Ω&

V$ .ase

 of 1)0V$ .ase

1.)

1-0.4

120

2.,)

2.-)

94.12

120

2).--

-.99

,-.,0

120

2-.1,

 Transfor  Transformer mer Sequence Sequence Impedance Impedance Test Sheets

   

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 %$&

Impedance "alculated %Ω&

V$ .ase

'ero Sequence Impedance 

.- 9.42

49.2 ,.9-

120 120

10.10 9.))

 Transfor  Transformer mer Sequence Sequence Impedance Impedance Test Sheets

   

Tertiar' 9.9

kV

10.

,1.4,

120

9.-1

1.-1

)2.--

120

4.90

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

Impedance "alculated %Ω&

V$ .ase

'ero Sequence Impedance 

.-2

49.0,

120

10.0

9.910.2

,., ,1.40

120 120

9.-4 9.-1

1.-)

)2.14

120

4.4

" termina". t is e6ressed in 7hms and is #i%en b' - times test %o"ta#e/test  Transfor  Transformer mer Sequence Sequence Impedance Impedance Test Sheets

   

Tertiar' 9.9

kV

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

Impedance "alculated %Ω&

V$ .ase

'ero Sequence Impedance 

21.1

0.41

120

).,9

20.4)

0.42

120

).

20.41

0.42

120

).

20.99

0.40

120

).,,

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

Impedance "alculated %Ω&

V$ .ase

'ero Sequence Impedance 

21.--

0.40

120

).,

 Transfor  Transformer mer Sequence Sequence Impedance Impedance Test Sheets

   

Tertiar' 9.9

kV

 Tertiar! ,indin# ,.9- % 0.40 %

,.-4

0.2,

,., %



$

0.42 %

0.)

,.-4 %

T

0.2, % 0.) %

 Transfor  Transformer mer Sequence Sequence Impedance Impedance Test Sheets

   

Transformer Sequence Impedance Test Sheets Substation:

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

Tests To Determine The Equivalent Positive Sequence Impedanc a.

Th The e tes testt is is d don one eb b' 'k kee eei in# n# th the e$ $V VS Sid ide eS Sho hort rt ir( ir(ui uite ted da and nd V Side Side is s su u" "ie ied dw wit ith h- ha hase se )0 )00V 0V A Su Su"' "'..

b.

The tte est h ha a%e b be een ( (a arried o ou ut ffo or N No omina ina" T Ta a3  i# i#h hest a an nd $ $o owest TA TA& HV  T LV

Ea

~

A

Eb

~

Test 1: Tap Position

Volta#e $pplied %V&

1

2)0.9

11

2-9.

2

2-9.2

A

Ec A

~

Transformer ransformer Sequence Sequence Impedance Impedance Test Sheets

 Transfor  Transformer mer Sequence Sequence Impedance Impedance Test Sheets    

Transformer Sequence Impedance Test Sheets Substation:

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

Tests To Determine The Equivalent 'ero Sequence Impedance a.

The test is (arried out b' su"'in# a (urr (urrent ent of rated fre5uen(' bet between ween ara""e" (onne(te (onne(ted d 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

Tap Position

Volta#e $pplied %V&

1 11

2--.9 2-2.2

A

 Transfor  Transformer mer Sequence Sequence Impedance Impedance Test Sheets    

Transformer Sequence Impedance Test Sheets Substation:

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

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

 T

LV

Test ):

A

A

A V

Tap Position

Volta#e $pplied %V&

1

2-).

11 1-8

2-2.9 2-2.9

2

2--.4

Tests To Determine The Equivalent 'ero Sequence Impedance a.

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

 Transfor  Transformer mer Sequence Sequence Impedance Impedance Test Sheets    

Transformer Sequence Impedance Test Sheets Substation:

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

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

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

 T

HV

Test *:

A

A

A V

Tap Position

Volta#e $pplied %V&

1

.

11

.)

1-8

.,

2

.

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

 T

HV

Test 1:

A

A

Tap Position

Volta#e $pplied %V&

1

.,

 Transfor  Transformer mer Sequence Sequence Impedance Impedance Test Sheets    

Transformer Sequence Impedance Test Sheets Substation:

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

"alculation To To Determine The Equiv Equivalent alent 'ero Sequence Imped Impedance ance at HV 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$T Z$T

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



 Transfor  Transformer mer Sequence Sequence Impedance Impedance Test Sheets    

Tertiar' 9.9

kV

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

Impedance "alculated %Ω&

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

 Transfor  Transformer mer Sequence Sequence Impedance Impedance Test Sheets    

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 %$&

Impedance "alculated %Ω&

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'ero Sequence Impedance 

.910.,)

44.)9 ,.)

120 120

10.01 9.-

 Transfor  Transformer mer Sequence Sequence Impedance Impedance Test Sheets    

Tertiar' 9.9

kV

11.-2

,1.0

120

9.29

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120

4.44

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Impedance "alculated %Ω&

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'ero Sequence Impedance 

.92

44.4-

120

10.0

10., 11.-

,.,1 ,1.4-

120 120

9.-9 9.-1

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)2.20

120

4.44

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

 Transfor  Transformer mer Sequence Sequence Impedance Impedance Test Sheets    

Tertiar' 9.9

kV

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

Impedance "alculated %Ω&

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'ero Sequence Impedance 

21.14

0.4

120

).-

20.4

0.9

120

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21.,

0.4

120

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120

).4

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'ero Sequence Impedance 

21.2

0.9

120

).,0

 Transfor  Transformer mer Sequence Sequence Impedance Impedance Test Sheets    

Tertiar' 9.9

kV

 Tertiar! ,indin# ,.) % 0.9 %

,.00

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