l*- c

ALSTO M

RESIDUAL VOLTAGE TEST_ON UCHTI.{ING ARRES( Extropolol ion methotJ )

As per IEC-60099-4, sedion 5conducted in following monner.

closs lhe residuol vol toge tesl con [-re

residuol vohoges is fo obloin lhe nrox.ol l specif ied currents ond wwe shopes.ond from lhe mox. residuol vohoge ol otests os specified by the monufaclure.

The mcp<. residuol vchoge of o given orresler design for ony current ond woveshope is cofculoled from fhe residuol vohoge of the ru.tion, testetJ during type testmuhipl ied by o specif ic scole fqcicr. This scole focfor is equol to the rJio'of t tredeclored mqx.l residuol vohoge os clrecked during rouline lcsl lo l lre rnccrsr,,rocjresiduol vol loge of lhe seclion oi the sonle currenl ond wove slrooe.

To follow lhe obove melhocj dio Brldio.A9x23nrnr (closs 1) blocks' werebehveen percenfoge of the residuolcurrenl volue of I kA, 2kA,3 kA, AUj,,

Test procedure ::

l . Test lhe LA pnit ol ony c,rrrenl belween I l .A io 3 kA ot B/2O1ts wove slrol>e upcJrecord lhe residuol vol toge.

2. From lhe grcrph (typu lested oi CPRI ) , f ind out the residuol vol tope of t l reb lock o l sorpe ,cur ren l i .e lhe cur ren t o l w l r i c l r lhe LA un i t rou l ine les lec l . [ r rsurcl l ' ro t ' the b lock C inrens ion ond long duro i ion cneroy c loss used in LA un i l i ssome os thol of type lested block.

3. Colculote thb scole fodor.iResiduol vol loge of t l re LA unit dur irrg rout ine lesl .

'

Scole foctor : i - : --------

Res. vol toge of the block of some currenl ond wove shope.

i( meosured during type' test )

4. Colculote lhe residuol vol loge oi l ' lornirrc l j isct ,crrge cur i 'err l c-rs fol lows.

Scole FocJor X Residuol vol lcge of lhe block.rneosured ol l0 l ,A & t l f 7-C1ts vt tvcs l rope dur ing lype les t .

5 . T l rc Co lcu lo led u<, : lue o I rcs iduo l vo l l c rge s l rou ld l - rc Jess l l r r : i r l l re guorc r r r l ccc , l

n rox . res iduo l vo l loge or s l rou l r l r r - rec l lhe r .cqu i ,e r l rcn l os S ,er IEC-99 -4 ,Annex.K, Tob le l .

A P P R O V I D B Y :

The' purpose of lhe meosurernent of llreresiduol vohoges for o given design forThese ore derived from lhe type lest dotofightning impulse current tsed for rouline

x ?3 ( c loss 3 ) , c l io.64x23nrnr (closs 3 ) ,lesled oi CPRI ond o groplr wos drowrrvo l toge w, r . t . lOkA Vs l ig l r in ing impu lse

5kA, lOkA, 201,',4 wwe shope of B/20 1ts.

l ) ^rp#'L r ' J zstv.t ts A 2'1')"

l - 1

AR E V AA,

Extrapglat ion method for residual vol taqe test inq of Class 2 (4823) Surqearrester

L igh tn ing lmpu lseCurrent in KAp

Residual vol tages of each blockin kVp Highest Value

of the testvalues (KVp)

Mult ipl icat ion factor(Residual vol tage at

l0kAJResidual vol tageat tested current)

1 z

1 , 0 A A 7 O . J U o . z o o . o / 1 . 3 0

2.0 7 . 1 2 6.60 6.69 7 . 1 2 1 . 2 2

3.0. a A 1I - + l 6.89 6.92 7.41 ' 1 . 1 8

4.0 7 A O 7.06 7 . 1 7 7.69 1 . ' 1 3

- 5.0 7.90 7.22'7 a-7 7 0 n 1 . ' 1 0

10 .0 8 . 7 1 7.95 B . 1 0 B . 7 1 1 . 0 020.0 9.87 8 . 9 5 9 . 1 3 9.87 O.BB

Extrapulation example:

Rating (kVrms)Nominal discharge current (kAP)Tested current (kAp)Residualvo l tage (kVP)

Extrapolated value of residualvo l t age a t 1OkAP ' , ' , i , . ' , ' , ' , , i i

Res idua l vo l tage a t tes ted cur ren t X

Mul t ip l i ca t ion fac to r (Res idua l vo l tage a t

lOkAJResidual vol tage at tested current)

1 4 4 X 1 . 1 8 = 1 7 0 K V P

OU1 n

J

1 ^ AI t 5

Reference:(i) cPRl Type test report no:HV/1 (lCG)/01/85S8/ALSTOM Dated 26.03'2001

ii i) Cpnr Type test report no:HV/1 (lCG)/0118591/ALSTOM Dated 26'03'2001

/-\2_

60039-4 er [EC':?OO4

If the Arrester qtY is 12If the Arrester qt.v is 27

* - to ' l *

c l i f l lernal partiel discharge tes1, This tert shall Lre perfornred on each arrestet unit- The testsar f lp l€ mav be *h ie ldad aga ins t €x te rna l Fa t r t ie l d ischargss '

The power - f requency vo l tag€ sha i t be inc reased to the ra ted vo l tag€ o f the sample- he ldfo r 2 's ts 10 s , -and ihen decreased to 1 .O5 t imes the cont inu*us opera t tng va l lage a t L l le

sample- A t tha t v f , l tage , the par t ia t r d ischarge leve l sha l l be nreasured accordrng to IECgOZiO '1 t re

measr r red ua lue fo r the in te rna l par l ia l d rscharge sha l l no t exceed 1O pC

,q l te rna t ive ly , the manufac turer may car ry ov t the par t ia ! d ischarge measurement a t the

ra ted yo l tags or a t a h ighar va fue w i lhout reduc ing the tes t vo l tage a f le rua .ds ;

Io r r r rss te r un i ts w i th ses led hous ing , a leakage check shaf l t re n rade on each un i t by zny

sensitive ffethod adopted by the manufactur*r;

currentr distribHtiof, t€sl for rnulti-column arresler^ This fesl shall be carried out on all

grcraF* rrt parallal resislsrs A group of p*rallel resislors meafle a part of the assembly

iheie oo inlerrnediate electrical connectiDfl bet,aeen the colum n5 is ssed The aranu-

fgtclurft €hall apacify a suittt3,6 impulse D[rt&n1 in the ranEE O.&1 to I t imss the nomrnal

d isEharge cur rsn t s t -v rh ich the cur ren t th rough each co lunr n sha l l t le measured

The h ighes t cs r ren l va lue eha l l n { } t be h igh€r than sn upPer l im i t spec i t i€d bY the

rnanu la i tu rer , Thg- cur ren l impu lse sha l l have a y i r lua l f ron t t ime e f no t less tha f l 7 t rs and

the ha l f ' sa lue t ime may have anY T a tse

trI(}TE 2 tt tfte tsted volta4'e at the gf9up3 o{ Farslge.l r€siatora vBed in the deagn it too high esnP&ted to

avat:airte test fr.atitie?, tt€ f6tsd volt;qs ot tha group ot pwqttq,l f8Bi3!4ru used in $tla tdtt coF ba tedutd byi&*cin* inf€rmedisie €rectrimt coinectiwa betwe€m ttE colsmns, the.eby estabtiBh;ng *vdat artitleitlg;rF! ;f

"Ort"tf"l reaao.tcr&. Each auch artiliciat !l.?up ten lrwq o8a8 the cutr*td dist.ibu{ion leal apeeitied.

9 .2 Accep iance tes ts

9 .2 .1 S t tndard accep lance tes ts

when the purchaser specifies acceptanc€ 1e9t5 in the Purchage agree|rtent. the foltowing tesis

"t"if Ur - ' iO" on the nearest lowsi whole nunxller t€ the cube rool of the nilmb€r of arresters

to be su,pplied.

a) Maesurement sf poNer-frequency vollsge on lh€ compi€le arrest€r al th€ r€ferenc€

cur ren t measured a t the bo t tom o f ihe a l res te l . The nreasured va lue shag l t re w i th in a

; ;g , " ;p ; ; ; * ; by the manu{ac lu rer . For n ru l t i -un i t a r res ters , the va lue may dev ia te l rom

lhe ref€rgflce vollage of the arresisr

b) L igh tn ing in rpu lse res idua l vo l tag4 on the comple te a f .es te r o r a r tes le f un i t (seE a 3) ' a t

nomina l dxscr ra rge tu r renr t i f pos i ib le 6 r a t a cur ren t va t i le chcsen accord ! f l9 to - -B :^ I^L l :

casg. lhe v i r tua i t ime to ha l f -va lue f ln th€ ta i l l s l€ss i rnpor lan t and n€ed no t be compl reo

wi th .

The r€s idu : l vo l lage o f a comPle te a r res l€ r ts laken as lhe sum q t the res idua l vo l tages o f

lhE ind iv idua l a r fes te r un i ts . ihe res idua l vs l tage fo r ihe comple te a r res le t sha l l no t be

h igher lhan z va lue apec i f ied by the manufac t i l re t .

c) lrrternal partial discharge test

Th€ test ehatl be parf{)rmed on the ct}mplPte srres?er or lhe arresler unirs The te$t sample

nray be sh is ldBd aga ina t Fx t3rna l par t ia l d iecharEes '

The power-frequency vdlla&e shalt be inc,reased to tt le rated vsltage of the *ample, held

tor 2 s lo 1O s, and ilt*r rfJon**"ed to 1.{}5 times the continuoug speratirig.voltage..ot the

" l ' " r -p i " ' -n i_ rnb i ; ; i i * " . - ihe par t ia t d ischarge t€ve t sha l t be measured accord ing to

i f6 ' "e 'oaz i i . l t i *L l " " r ro va tue fo r the in te rnaTpar t ia l d ischarge sha l l no t exceed 1o pc

Arrester Qty Sample QtyI

8 2.1 / J

64 4125 5216 o

343 l

512 8

then you have to select 2 samPles

then you have to select 3 samPles.

d )

e )

3

1 S 3 0 7 0 ( P a r t l ) : 1 9 9 3

H.8 POROSITY TEST ON PORCIL, I INCOMPONENTS

H-E'l Pieces freshly broken lrorn a suitablepi . "o o i - porccta in 6rct t gs a contro l sanrpleid.laceot t i the compenent or one of th-e corr' 'ooients thernselvea, wh rchcver tlte mnnuth ctureri r refsrs, shal l bc i rnmcrsed in orrc fcrccnt'g ico lo i ic

io lut ion of fuchsin ( 1 g luchsi r t in100 g of mcthylared spi r i t ) under a pressure ofnoi

"t"rr--itr"ri 150 kC/cnit lor a- piriod such

i t ,a t tUr-product of rc ; i durat ion i r b()urs endthe tes l pressure in kg/cnr t is not less thsnI 800.

f I -8.2 Tbe f ragmeots s l rat l theo bc sg111etedfrom the

-solu(Ton, wlshcd, dr ied i rnr l hrohet t '

Examinat ion wi th naked eye of f res l i ly ' br t :kensur faces shal l not revsxl any dyc per te t rat ron 'Penetra l ion in to smal I sracks forr t tc 'd dur inpthe ls i t ia l breaking shal l bc peglccted '

H.9 GALVANISTNC TEST ON T}1U'I^LPARTS

H-9.1 Thc wcigbt and un, formi t l ' c ' [ coat ing

ihat t bc- aer i r "mrncd by tbc test : t g iver l in

i ! - Zo: l and shal t sat is fy l l rc r r :qui rcnaent ' igivcn in Table 12'

J-l ^RTIFICIAI, POLLUTION,fI iSI-

J - l , l T l r i s { c s t d c n l o l l s t r i l t c s l h c : t t r i t i t y r r f t l r c

n t ia t ra i i r> r r . i t l t s t l r rd thc c Icc t r tu l ] ' s t rc lse ' t

i i usea bv co t t ra rn ina t i t )n on t l t c a r res ter . ho t rs '

i#'- di';;i;;l;i;; ' i; be exam ined arc.rrrcr nta i

, i ib ir i ly- i t i - -- i - l5plat ion "vl thst0rrd" l hc Iest

shal l be madc on .o*pi t t t arreslcrs ' ( ln lr*--1l l

i r igh*tr vol lxge rut ing-of euch t1 'pe :"J ' - t t , : : l 'snshXt t be tes icd . Confo( rna l l cq o l . th .c , l r i l l h r ' s t

vo l t i t l : c tn lcd i l t rc$ tc r rn - t t r i t 5 t ; t r t r l : r r< l s l r l l l hc

; ; ; ; i ; i : l ; ; i l - i < r ' i i c ' r r t r r , * t ' a t e c r ) r r r ( ' r r l r l t t ( r { ' l

lorvcr ", t i tagc t 'at Ings of t hr: sanlc ar rcstqr t5 l ]q

aod des ign .

J-2 rowER FREQUENCY T['ST VOLTAGIISOURCE

J-2.1 ' Ihe porrcr f requency test vo l ta l ;c , - : l t9 :

i^J1n. t l tnua of -nreasuremcnt '

s l r : t l l bc r t l

;:';";.j;;;;'-'itrt rs zoii.-'rne rcgutation 1l tbs.""i.""irri.ir u. *Jiir ai i,i rnainrrin thc sFect{ru<l

NOfE - t1 ' , 1grr r r f thc acarc ' ty oJ ztoc u 'Frc5. ) r

uscd f t , : r Ea l va l r j r i og o (h t r t ypcs 0 t an l l co r ro t l cLo

o rc t cu t i , r p . t Lch rB a l un r i o j s i ng ms1 ' . bc uscL1 , suD-j r c i r o i l g rec rncn t be t seen (hc pu , r coa t c r

19 : ^ l : , 's r r on t i c r ] I ( i 3 oo t pcss i b ,e I c g i ve o€ t l r r t c spcc r -

l i . t i i on i f t r r * r r ch a l i e rna ( i v cs a t p r c t cD t huL l bc ! c

a re c rpec ted t o b r - i n c l ud fd I e l c r '

TrUlc 12 Welgbl of Coal lug

( Clause H-9.1 )

Art ic lqr Arersgo Coat logWel8trl, M/n

1 1 : ( z )\ ' '

& / l ! l t

Fab t i ca (ed s t cc l a r t i c l es i

5 sLm th r ck and ovc r 6 j 0

L jnde r -S mm, bu t n t ) t l c ss l l ) r l t . /' " - i ' ; ; i o ' t o ' " kne r : ' 161J /

L l odc r 2 116 , bu l n t ) t I ess t banl l t l lm ln th ickocs9 i ru

C u s ( L n B r :

C r , : ) ' i r on , r r r a l l c rb l e i t on' I h r *a t t c c l 1 \ o r k o thc l l b so t ubcc end

t h e t u b c [ t l i n g s l

l0 mrn ( l ia f t i lcr aud ovel

Unr l t r l0 rntn d iumstcr

6 1 0

300L t v

ANT{EX J

1 Tabte g \

ART ITICIAL POLL UTIO i\ T ES I t-')C:,O I",S I E'I AL OX I-DI' SURGE ARR'ESI'ERS-'-#rrtfr -ToRCELAIN HousING

l c ' l t i l ge o r r thc i t r rc : i te r , cxcep l . fo r ln [ req-uent '

; , l i ; : i ; ;J; i i " l . ' r , , r r- .vclc iol tasc d ips of noi r ' ,orc t l ra l r 5 pcrcerr t i lur ing leakagc cDr lc 'n !

pr t lsc 5.J.3 TT.S I' SPtrCINlCN TR.EPARATION AND

N' ( }UNTINGJ-3.1

" I 'ust sp ' :u i tnet t prcpar l r t ior l nnd mount tog '

i t r c i : n r t s l xd i l i t y o f a ; r a i r cs te r sha l l bc demon-

r l ' , i , i . i - , i t rn . r r91r ' nrea:urctnent of c lnc or morc

, 1 f 1 l i 6 f i r l l r 111 ' i r r 1 :

: r r r c \ l \ : f l \ ' l l r p \ i r i l l t l f ( ' : . r c s i s t i v c L :L l l ) I 1 )o r ' l c l t l 0 I

l i : a kage cu r r c ) l l : o f wa t t l oss '

I t s rab i l i t v i s t o be d r : t l l o l l s t r s t ed by t e rnpc ra tu r c

ni .n i - i . i ; " i ' t ! I hen a tc lBpsratu( e sen s inS.devicc

( sucu as t tlrermn"c'u;t;i -ll]l^!l j.l,:lt;'jtd inc, i . l , r r r , ' . 's tcr scc l " ion ' i rnmcdiare l l ' ad jacent t t ' t

a va l vc e l c tncn t ,

Thc g l rester 1o T)q tcsted shal l bc assemb)cd

; ; ' ; i ; ; ; i ; 'a* . i t is i t r tcnt lcd to be urcd i t rserv ice

crccilt os nolctl :rbctvc'

30

1.0 Routine Tests

t AREVA T&DVA

Lightning Arresters (pvt) Limited.LAI.LA.MC.0l.Rev 0

TOLA

OO KVSOUR

ROt

A T

r

1 / r \ I

corCAP,

&

I

lT,t

I

f

1.i Measurement of reference voltase tesut

View of 200 kV HighCONNECTION DIAGRAN\

*o**S\tff X?iJtrt-1@ T l

D clean the L.A thoroughrv & e I I lr?ll,i ".u.connection.) Corurect the other end of L.A. E = .) Switch ON H'V. & raise the voltage till the required current as per GTp is passed & note down the

reference voltage . Record this in the Log book) If the measured reference voltage is less tf,an rating of LA then send the LA for reassembly.) Depending upon the value of reference voltage thJ units will be assigaed and marked A,fi,C, D, E. Unit.

'A' will the top most unit having higher reference voltage and otheri in descending order.

Acceptance criteria :F Measured voltage should be more than the rating of L.A.

Note : This test will be conducted on each unit of LA. The reference voltage of the complete arrester istaken asthe sum ofthe reference voltage ofthe each arrester unit. The reference voltase ofthecomplete L.A should

be more than the ratine of L.A.

/fPrepared By { ($l

\rylApproved By