Transformer Impedance Calculation Sheet

7/24/2019 Transformer Impedance Calculation Sheet

1/30

Transformer Sequence Impedance Test Sheets


Substation: New Zakher Grid 90/120 MVA

Transformer !: T201 Vo"ta#e $e%e" &rimar' Se(ondar'

!ate: 2)*+eb*1, 220 kV -). kV

Tests To Determine The Equivalent Positive Sequence Impedanc

a. The test is done b' keein# 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" Ta3 i#hest and $owest TA&

Test 1:

Tap Position

1 2-4.)

11 229.,

2 224.9

Transformerratin#

Volta#e $pplied%V&

T LV

~ A

~ A

~ A

HVEa

Eb

Ec


2/30





!ate: 2)*+eb*1, 220 kV -). kV

Transformerratin#

Tests To Determine The Equivalent 'ero Sequence Impedance

a.

b. The %arious ases of Tests ha%e been ro%ided be"ow

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

Test 1:

Tap Position

1 2-1.9

11 2--.9

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.

Volta#e $pplied%V&

LVTHV

A

A


3/30





!ate: 2)*+eb*1, 220 kV -). kV

Transformerratin#

1-8 2--.

2 224.9

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

Test ):

Tap Position

1 2-2.4

11 2-2.2

1-8 2-2

2 229.4


a.

Volta#e $pplied%V&


LVT

A

V

HV

A

A

A

V


4/30





!ate: 2)*+eb*1, 220 kV -). kV

Transformerratin#


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

Test *:

Tap Position

1 .1-

11 .)-

1-8 .,

2 .2

"ase *:- V Supplied/ HV (pen "ircuited/ Tertiar! "losedTest 1:

Tap Position

1 .9

Volta#e $pplied%V&

Volta#e $pplied%V&

HVT

HVT

LV

A

A

A

V

LV

A

A


5/30





!ate: 2)*+eb*1, 220 kV -). kV

Transformerratin#

"alculation To Determine The Equivalent 'ero Sequence Impedance at HV+ V an

ZT medan(e Measured in &rimar' (ir(uit with Teritar' Shorted and Se(ondar' 7en

Z$T medan(e measured in Se(ondar' ir(uit with Teritar' Shorted and &rimar' 7en

Z$T medan(e Measured in &rimar' (ir(uit with Teritar' Shorted and Se(ondar' Shorted

Z$T medan(e Measured in Se(ondar' (ir(uit with Teritar' Shorted and &rimar' Shorted

Z &rimar' medan(e ZT*ZT

Z$ Se(ondar' medan(e Z$T*ZT

ZT Tertiar' medan(e S;=Z$T*Z$T??

A

V


6/30


Tertiar'

9.9 kV

- HV Supplied/ V Short cicuited/ Tertiar! "losed

V$ .ase of 1)0V$ .ase

1.41 1-1.21 120 2.1

2.-) 94.12 120 2).-)

-.99 ,-.,0 120 2-.19

"urrenteasured %$&

Impedance"alculated %&


7/30


Tertiar'

9.9 kV

- HV Supplied/ V (pen cicuited/ Tertiar! "losed

V$ .ase

.42 44.9, 120 10.0,

10., ,.49 120 9.)-

" termina". t is e6ressed in 7hms and is #i%en b' - times test %o"ta#e/test

"urrenteasured %$&


'ero SequenceImpedance


8/30


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-

"urrenteasured %$&





9/30


Tertiar'

9.9 kV

- V Supplied/ HV Short cicuited/ Tertiar! "losed

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

V$ .ase

21.1 0. 120 ).0

"urrenteasured %$&



"urrenteasured %$&




10/30


11/30





!ate: 2)*+eb*1, 220 kV -). kV




Test 1:

Tap Position

1 224.,

11 229.,

2 224.9

Transformerratin#

Volta#e $pplied%V&

T LV

~ A

~ A

~ A

HVEa

Eb

Ec


12/30





!ate: 2)*+eb*1, 220 kV -). kV

Transformerratin#


a.



Test 1:

Tap Position

1 214.

11 21.4


Volta#e $pplied%V&

LVTHV

A

A


13/30





!ate: 2)*+eb*1, 220 kV -). kV

Transformerratin#

1-8 21,.

2 21,


Test ):

Tap Position

1 21.-

11 21

1-8 21,.

2 21.


a.

Volta#e $pplied%V&


LVT

A

V

HV

A

A

A

V


14/30





!ate: 2)*+eb*1, 220 kV -). kV

Transformerratin#



Test *:

Tap Position

1 .,91

11 .,)

1-8 .,,

2 .,02

"ase *:- V Supplied/ HV (pen "ircuited/ Tertiar! "losedTest 1:

Tap Position

1 .

Volta#e $pplied%V&

Volta#e $pplied%V&

HVT

HVT

LV

A

A

A

V

LV

A

A


15/30





!ate: 2)*+eb*1, 220 kV -). kV

Transformerratin#









A

V


16/30


Tertiar'

9.9 kV



1.) 1-0.4 120 2.,)

2.-) 94.12 120 2).--

-.99 ,-.,0 120 2-.1,

"urrenteasured %$&



17/30


Tertiar'

9.9 kV


V$ .ase

.- 49.2 120 10.10

9.42 ,.9- 120 9.))


"urrenteasured %$&




18/30


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

"urrenteasured %$&





19/30


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 ).,

"urrenteasured %$&



"urrenteasured %$&




20/30


Tertiar'

9.9 kV

Tertiar! ,indin#

,.9- %

0.40 % ,.-4 0.2,

,., % $

0.42 % 0.)

,.-4 % T

0.2, %

0.) %


21/30




Transformer !: T20- Vo"ta#e $e%e" &rimar' Se(ondar'

!ate: 2)*+eb*1, 220 kV -). kV




Test 1:

Tap Position

1 2)0.9

11 2-9.

2 2-9.2

Transformerratin#

Volta#e $pplied%V&

T LV

~ A

~ A

~ A

HVEa

Eb

Ec


22/30





!ate: 2)*+eb*1, 220 kV -). kV

Transformerratin#


a.



Test 1:

Tap Position

1 2--.9

11 2-2.2


Volta#e $pplied%V&

LVTHV

A

A


23/30





!ate: 2)*+eb*1, 220 kV -). kV

Transformerratin#

1-8 2-2.4

2 2-0.9


Test ):

Tap Position

1 2-).

11 2-2.9

1-8 2-2.9

2 2--.4


a.

Volta#e $pplied%V&


LVT

A

V

HVA

A

A

V


24/30





!ate: 2)*+eb*1, 220 kV -). kV

Transformerratin#



Test *:

Tap Position

1 .

11 .)

1-8 .,

2 .

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

Test 1:

Tap Position

1 .,

Volta#e $pplied%V&

Volta#e $pplied%V&

HVT

HVT

LV

A

A

A

V

LV

A

A


25/30





!ate: 2)*+eb*1, 220 kV -). kV

Transformerratin#









A

V


26/30


Tertiar'

9.9 kV



1.4)9 1-0.29 120 2.1

2.)1 9.40 120 2).-)

-.4 ,-.-1 120 2-.19

"urrenteasured %$&



27/30


Tertiar'

9.9 kV


V$ .ase

.9- 44.)9 120 10.01

10.,) ,.) 120 9.-


"urrenteasured %$&




28/30


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

"urrenteasured %$&





29/30


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

"urrenteasured %$&



"urrenteasured %$&




30/30


Tertiar'

9.9 kV

Tertiar! ,indin#

,.) %

0.9 % ,.00 0.-2

,.,1 % $

0.9 % 0.)

,.00 % T

0.-2 %

0.) %

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Transformer Impedance Calculation Sheet