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PHN 3: MY BIN P PHN PHI

PART 3: DISTRIBUTION TRANSFORMER

1. TNG QUANGENERAL

1.1. M t

Functional Description

Mc ch ca chng ny l m t chi tit v my bin p c s dng t!ng d" n ny#

The aim of this document is to give the detailed description of the Distribution Transformers

to be used in the current project.

$h%m vi cng vi&c my bin p ph'n ph(i ba! g)m cng tc ch*+n b, v & t-nh . c

ch/p th*0n cc bn v1 thit 2 chi tit3 thit 2 24 th*0t3 bn v1 thi cng3 gi/y ch5ng nh0n sn

6*/t ca nh my %t ti7* ch*+n 89: ;

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The Transformers shall be designed in accordance with the above*mentioned standards, and

applicable drawings.

My bin p cR 2h nSng h!%t Eng li7n tc vLi i&n pQ tCn s( t!ng 2h!ng d*ng sai O ,nht!ng ti li&* T*i ,nh 24 th*0t ny#

The Transformers shall be capable of continuous dut# at voltage+freuenc# within

the tolerances stated in this Specification.

My bin p phi cR 2h nSng c*ng c/p cc bin Hi i&n lLn t!ng thUi gian ng?n th!ng F*a

. p 5ng nhVng dWng 2h>i Eng Eng c i v!#

The Transformers shall be capable of suppl#ing short term transients to meet motor starting

inrush currents#

My bin p cR 2h nSng v0n hnh vLi cng s*/t ,nh m5c t%i b/t 2X n/c i* chYnh i&n p h%th n!#

The Transformers shall be able of operating at their rated power output at an# specific tapping.

My bin p c thit 2 ch,* "ng c tc Eng l"c v tc Eng nhi&t ca dWng ng?n m%ch

b7n ng!i m 2hng b, h h%i#

The Transformers shall be designed to withstand without damage the thermal and d#namic

effects of e-ternal short circuits.

Bc thng s( 24 th*0t dLi 'y s1 c*ng c/p thng tin ch! nh sn 6*/t my bin pZ

The following technical parameters shall guide the manufacturer forthe Distribution

My bin p Q Transformers

[i&n p t*ng th ca lLi hi&n hV* \ ]^ _`

$-isting /etwork )rimar# 0oltage ]^ 2`

[i&n p th5 c/p

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Transformers shall function correctl# between the s#stem stead# state voltage and

freuenc# tolerances detailed below

\ GCn s(Z < K danh ,nh ef#

5reuenc# 6! 78 nominal 96:

Kn nVa3 my bin p v cc ph 2i&n i 2m g?n t7n th'n my s1 h!%t

Eng b-nh thUng t!ng cc i* 2i&n cR cc s" c( bin Hi i&n lLn th!ng F*a

5urther more, the Distribution Transformers and associated euipment shall be able

to function through the following short*term transient variation

[i&n pZ anh ,nh =f3 \]ng

thng m%i . phA hp vLi i* 2i&n O ,nh t7n#

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The Transformers shall be suitable for installation and operation in 0ietnam and the

environmental conditions described in the data sheets and project specifications.

The manufacturer shall be responsible for ensuring that all euipment and components

supplied are suitable for the operation and conditions stated. Where the manufacturer

standard or preferred design option does not meet the operation or environmental

conditions, the manufacturer shall give details of the technical changes and commercial

impact of compl#ing with the stated conditions#

My bin p thit 2 cR nhi&t E 6*ng F*anh l ^

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The euipment ma# be inspected during manufacturing in an# of the plants, which are

involved in the related manufacturing. The &ontractor shall make provision in his rates

to cover the $ngineer e-penses for such inspection. The euipment shall be delivered with all

the documents reuired for installation, testing, commissioning, operation and servicing*

maintenance.

kh thC* s1 thng b! ch! kh t v/n . vi&c 2i.m ta c dion a thD! ng cc giai !%n sa*Z

The &ontractor shall notif# the $ngineer so that inspections ma# be conducted at the following

stages

Bh t%! lqi thjp

&ore fabrication

T*/n d'y

&ore winding

Gh nghi&m p s*/t thy trnh ca thAng My bin p

Tank h#drostatic pressure test

My c sn sng ch! vi&c th nghi&m thng thUng v gi i

Transformers read# for routine testing and dispatch

My bin p c l?p @t v /* n(i

Transformers installed and connected

Bh/p th*0n v bn gia!

(cceptance and handover

4. 5IM T;ATEST

4.1. Th< n=hi*7 7>u

T(pe Tests

GHng F*t

%eneral

kh thC* s1 phi t-nh d*y&t ch! kh t v/n vLi Ni/y ch5ng nh0n th nghi&m m* my

bin p ca nh sn 6*/t ca phWng th nghi&m Ec l0p3 m ba! g)m cc 2t F* th

nghi&m sa*

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The &ontractor shall submit for the $ngineer@s approval with the proposed

manufacturer Distribution Transformers@ T#pe Test certificate from independence laborator#,

which included the following tests results

Gh nghi&m s" tSng nhi&t E

Temperature

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The c*En d'y

Ceasurement of Winding #

The procedure of the measurement of windings resistance shall be performed according to

I$& A'*". During this test the resistance of each winding shall be measured and the

temperature shall be recorded. The test shall be performed with D&>direct current?.The

measurement of the resistance of the windings shall be performed using a resistancebridge.

[! lUng tY s( i&n p v 2i.m ta E l&ch pha + Ceasurement of the 0oltage 2hng ng?n m%ch Q

Ceasurement of Short*&ircuit Impedance

[! lUng t> 2hng ng?n m%ch s1 c tin hnh t*'n thD! ti7* ch*+n 8IB J\=# G> 2hng ng?n

m%ch c 6Dm l mEt phCn ca i&n p ,nh m5c3 @c tng ch! t> 2hng My bin p#

The measurement of short*circuit impedance shall be performed according to I$& A'*".the

short*circuit impedance, which is e-pressed as a percentage of the rated voltage,

represents the transformer@s impedance#

G> 2hng ng?n m%ch s1 c tnh t!n > nhi&t E ch*+n l !B#

The short*circuit impedance shall be calculated at the reference temperature of A6=

[! lUng tHn ha! ti

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Boad Bosses Ceasurement

[! lUng tHn ha! ti s1 c th"c hi&n b>i c*En d'y th5 c/p b, ng?n m%ch v b>i s" tSng i&n

p > c*En d'y s c/p ch! n 2hi dWng s c/p %t c gi t, danh ,nh ca nR# GHn ha! ti

s1 c tnh t!n > nhi&t E ch*+n l !B#[! lUng dWng 2hng ti v tHn ha! 2hng ti

[! lUng s1 c tin hnh t*'n thD! ti7* ch*+n 8IB J\=#

Wng 2hng ti @c tng ch! gi t, th"c s" m cCn . t h! c lqi t# GHn ha! 2hng ti

@c tng ch! cng s*/t ti7* th c lqi t my bin p h/p th 2hi tCn s( v i&n p > c*En

d'y th5 c/p %t gi t, ,nh m5c v c*En d'y s c/p b, h> m%ch#

The no load current represents the real value of current that is reuired to magneti8e the

magnetic core.The no load losses represent the active power that is absorbed b# the

transformer core when it is applied rated voltage and rated freuenc# in the one winding >e.g.

secondar#? and the other winding >e.g. primar#? is open*circuited

Gh nghi&m thng thUng ch/t cch i&n

Dielectric

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[. tnh t%ng thi bO! hWa3 tCn s( czng c g/p i3 v- th cm 5ng t vn l*n l

hng s(# B*(i cAng3 t!ng th nghi&m ny3 gi t, i&n p t7n mi vWng v nh v0y i&n

p t7n mi lLp l*n l*n g/p i

Induced 0oltage Dielectric Test Three*phase voltage, twice the rated voltage, shallbe induced to the transformer for " min. In order to avoid saturation, the freuenc#

shall be also doubled, so that the magnetic induction remains constant. 5inall#, during

this test, the volts per turn and therefore the volts per la#er are doubled.

`Li th nghi&m ny3 cUng E cch i&n giVa cc vWng d'y v cc lLp d'y c th+m

ta

With this test, the dielectric strength between turns and la#ers is verified

4.3. Th< n=hi*7 Cc ,i*tSpecial Tests

[. d*y t- m5c ch/t lng ca! ca My bin p3 cc th nghi&m @c bi&t sa* 'y c tin

hnh Z

In order to maintain high degree of the Distribution Transformers ualit# the following

Special Tests shall be conducted

uc ,nh cc i&n d*ng giVa c*En d'y \ /t v giVa cc c*En d'y

Determination of &apacitances of Windings*to*$arth and between Windings

Gh nghi&m 2h nSng ch,* "ng dWng ng?n m%ch # GhD! th nghi&m ny3

My bin p phi ch,* "ng c cc dWng ng?n m%ch li7n tc t!ng thUi gian

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[! %c h& s( tHn ha! ca i&n t> cch i&n ca i&n d*ng h& th(ng cch i&n

Ceasurement of Insulation

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influences the cooling, and conseuentl#, the transformer@s life. The distance between the

walls of the room and the transformer end points must be minimum " m

6. 5IM T;A ' NGHIM THUTESTING AND &OMMISSIONING

Bng vi&c th nghi&m ch%y th v nghi&m th* t%i cng tUng ca My bin p phi c

tin hnh t*'n thD! ti7* ch*+n kIG#BhY cR ngUi cR nSng l"c s1 th nghi&m v ch%y th

nghi&m th* My bin p#

5ield testing and commissioning of the Distribution Transformers shall be carried out b# onl#

ualified personnel shall test and commission the Distribution Transformers.

6.1. Th< n=hi*7 tOi cn= t8@n=

Site Testin!

`i&c 2im ta s1 c giLi h%n

Site Testing shall be limited toZ

_i.m ta t"c F*an v bng thit b, c Q 0isual and Cechanical Inspection

_i.m ta cc i* 2i&n c tnh v l~ tnh#

Gh+m ta l%i cc ch E b! Eng3 i* 2hi.n v tc Eng ng?t t7n bE hi.n th, nhi&t E O cchY q#QInspection of t he ph#sical and mechanical condition0erification that alarm, control,

and trip settings on temperature indicators are as specified

Gh+m ta s" tc Eng ca t/t c cc m%ch b! Eng3 i* 2hi.n v tc Eng ng?t t bE hi.n th,

nhi&t E v m5c dC*3 thit b, van an t!n v lD m/t p# _i.m ta l%i i&n t> ca! t%i t/t c cc

i.m 2t n(i i&n bng b*\l!n nhU dAng mEt t!ng nhVng phng php sa*Z

Operation verification of all alarm, control, and trip circuits from temperature and level

indicators, pressure relief device, and fault pressure rela#.

Inspection of all bolted electrical connections for high resistance using one of the followingmethods

9 dng )ng h) ! m i&n t> th/p+ Fse of low*resistance ohmmeter

Gh+m ta E ch@t ca ca cc b*\l!n nhU ch-a 2h! cR dng c ! m!mDn 6!?n

O c hi&* ch*+n thD! cc dV li&* c a a ca nh sn 6*/t Q 0erif# tightness

of accessible bolted electrical connections b# calibrated torue*wrench method in

accordance with manufacturerGs published data

Gin hnh 2h! st thD! ) th, nhi&t#)erformance of thethermographic surve#

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Gh+m ta l%i cc m"c dC* t!ng t/t c cc thAng dC* v s5 cch i&n#

0erification of the correct liuid level in all tanks and bushings.

Gin hnh th nghi&m @c bi&t v th nghi&m c thD! s" ngh, ca nh sn 6*/t#

)erformance of the specific inspections and mechanical tests as recommended b# manufacturer.Gh nghi&m l%i cc i.m n(i /t ca thit b,#

0erification of the correct euipment earthing#

Gh nghi&m bE i* chYnh ti#

Test load tap*changer

Gh nghi&m s" b! v& ch(ng sjt cm 5ng ca My bin p#

0erification of the presence of transformer surge arresters.

Gh nghi&m i&n Q IlDctical GDsts

Gin hnh th nghi&m i&n t> cch i&n giVa c*En d'y vLi c*En d'y3 giVa c*En d'y vLi /t#

GhUi gian th nghi&m l =< pht v gi t, i&n t> l0p thnh bng >

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)erformance of the e-citation*current tests in accordance with test euipment manufacturerGs

published data

[! lUng i&n t> cch i&n ca mi c*En d'y t%i n/c i* chYnh#k* d'y n(i /t lqi tip c0n

c3 tin hnh ! gi t, i&n t> cch i&n ca lqi t%i i&n p mEt chi*