7/28/2019 Feature-Automatic Transfer Scheme 3pp.pdf

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FEATURE

16 Jurutera, Jly 2008

1.0 Abstractelciciy is disibd o mos lg

pow/impon consms vi,

ls, wo fds of ndgond/

ovhd cbls. Gnlly, h min

cbl is opionl whil h oh is on

sndby s bckp wih h bs-scion

CLOSE. Other congurations such as

hving boh incoms CLOSe nd h

bs-scion OPeN, nd no bs-scion

lso pcisd. In h vn of fl in

h min cbl, h swich o nsf lod

o h bckp cbl will b don ihmnlly o moly vi conol cns.

th pocss migh k nywh fom

on ho o long spcilly ding pk

hos o nigh im.

aomic tnsf Schm (atS) is

dsignd o pfom sfly h omic

swiching o minimis inpion down

o ppoximly 1 sc o fs. rmdil

wok on h fly cbl o qipmn cn b

don l im. Sysm nomlision

is dsignd o b don mnlly.

2.0 Why We Need ATSth fncion of atS is o conomiclly

minimis nvoidbl spply inpion

o h csom. I is nw nhncmn of

sss by ilising h ls s-of-h-

pocion chnology. atS will impov

SaIDI nd, h sm im, impov h

lvl of csom sisfcion.

3.0 The Benets of ATSIt will benet Large Power Consumers

(LPCs) wih ls wo incoming fds,

wih o wiho h bs-scion. tNBsimpon SSus no opd in

plll d o sysm consins sch

s h incoming spply coms fom wo

diffn yp of nsfoms. tnsfoms

wih diffn volgs, impdnc, vco

gop, phs oion nd cpciy cnno

op in plll.

atS povids fs spply soion in

h vn of n incom fl nd impovs

pocion, wih pocion gins bsb

fl nd downsm bk fil

bckp pocion. In h vn of bsb

fl nd downsm fl, atS will no

op, hs pvning closing on fl

nd voidng ponilly sios dmg

o h qipmn inslld.

Vlbl d cn b obind fom

h ly sing bil-in cods in

Sqnil evns rcod (Ser) nd

evn rpos (er).

th atS sysm wih SCaDa-dy

fo mo conol, nd sysm monioing

nd bil-in ming, fncion s

fnc in h vn of n ngy m

fil nd s pow mngmnfciliy. this is ponil cos svings if

compd wih oh dndncy mhods

o chiv high libiliy.

atS cn lso opimis h ilision of

mnpow nd opimis h opionl

cos. I cn b implmnd in h xising

conol pnl of h incoming bk

pnl nd no x box is qid.

In Pk, wo sbsions hv bn

sccssflly inslld wih h atS

sysm:

i. SSu Bliong Si, Kl Kngsii. SSu SuK Ngi Pk, Ipoh

4.0 Technical Explanationth pocion schm fo pow sysm

shold poc h whol sysm gins

ll pobbl yps of fl.

unsicd foms of fd pocion

sch s ovcn lys m his

qimn, lhogh fls in h bsb

zon cld only f som dly.

High fl cn lvls chcisic

of disibion bss, nd if hs fly,

hy shold b isold qickly.

tdiionlly, IDMt OCeF lys

h incom sd s bckp fo

bsb pocion. Howv, hs lys

h incom o disibion bs hv

livly long fl cling im compd

wih ypicl bsb pocion schm.this poposl is dsignd o nhnc

h pocion vilbl h incoms by

retrotting the relays installed and replacing

hm wih h Dicionl Ovcn nd

eh Fl lys, SeL-351a. th sm ly

cn b pogmmd o op h atS.

atS shold b implmnd o ns

h consms conncd o picl

sbsion xpincs miniml spply

inpion ding fl. this schm

ss h logic wh wo o of h

combinions of h swichgs Incom1, Bs scion o Incom 2 will b on.

5.0 Conguration of ATS at SSUBalairong Seri, Kuala Kangsaran atS modl pplid h Pe Bliong

Si ss logic schm wh wo o of

Diagram 1: Schematic Diagram of SSU Balairong Seri, Kuala Kangsar

Automatic Transfer Scheme (ATS) Experience in Tenaga

Nasional Berhad Distribution Negeri Perak............................................................................................................................................................................................................................................................................

By: Engr. Mohd. Hashimi bin Hashim, MIEM, P.Eng, Engr. Megat Ahmad Fauzi bin Megat Rasidin, Grad. IEMand Sahari bin Adullah

7/28/2019 Feature-Automatic Transfer Scheme 3pp.pdf

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FEATURE

18 Jurutera, Jly 2008

h combinions of h swichgs

ih Incom 1 o Incom 2 will b

closd whil h Bs scion will min

closd in ny vn.

th SSu Bliong Si, Kl Kngs

nomlly ops wih on incom

[PeJaBat POS K. KaNGSar (0481)]

closd, h oh incom [DarI IStaNa

(0482)] opnd nd h bs i closd. th

conguration is not interchangeable (refero Digm 1.0).

an incom cbl fl will b dcd

by h psm OCeF lys. ths lys

will trip and clear the fault rst because it

is discimind gins h SeL-351a

h incom.

5.1 Upon inception of the incomercable fault:a psm, h OCeF pocion dcs

h fl nd bgins o im. I shold ip

h bk nd cl h fl onc is

im xpis.a h min incom, h SeL-351a will

no dc h fl o in h cs of bckfd

will ip slow hn h psm ly. If

h SeL-351a dcs h cn fl, hn

i will op IDMt ip o h bk (In

his cs, atS will no op).

Onc h psm ly ips is

bk nd disps spply, h SeL-351a

wold dc loss of spply condiion.

th SeL-351a wold hn inii is

aomic tnsf Schm (atS) logic o

so spply o is consms.

th SeL-351a h min incom

wold opn is bk nd inii signl

o SeL-351a h bckp incom in od

o clos is spciv bk. this wold

llow h hlhy incom o fd h lod.

5.2 Upon inception of a busbar fault:a h incom, h OCeF pocion

dcs h fl nd bgins o im. I

will hn op nd ip h bk.

a h ogoing fd, h IDMt OCeFpocion dos no dc h fl.

Clnc of fl is hogh h SeL-

351a ly h incom. aomic tnsf

Schm (atS) is disbld in h vn of h

SeL-351a oping on bsb fl.

5.3 Inception of a Downstream Faulta h incom, h SeL-351a ly will

bgin o im is IDMt lmn nd ip h

incom if h ogoing fd OCeF ly

dos no cl h fl. a h ogoing

fd, h IDMt OCeF pocion dcsh fl nd bgins o im.

I will hn op nd ip h bk

rst if the fault is sustained. The clearance of

fl is hogh h ogoing fd OCeF

ly nd h incom is no ippd.

6.0 Alarm and Indication SignalWhn n atS is bing opd, n lm

mssg sing atS OPerateD will b

shown on h LCD fon disply pnl of

h SeL-351a rly. th mssg cn b

s by pssing h reSet pshbon.

Whn h ovcn nd h flpocion ops, h trIP nd LeDs will

com on, s wll s h LeDs fo h phss

involvd in h fl. Bsids h fld

phs LeDs coming on, h ly will lso

disply O/C OPerateD fo Ovcn

tip o e/F OPerateD fo eh Fl

tip. Boh mssgs nd LeDs cn b s

by pssing h reSet psh bon.

Mnwhil, h mssg atS

eNaBLeD will b displyd on h LCD

whn h atS slco swich is in h

ON posiion wih oh atS condiions

(Incom Bk closd, Incom volg

hlhy, Bs ti Bk closd nd no

Vt fil), whil h mssg atS OFF

will b displyd whn h swich is in

h OFF posiion.

Wih his fciliy, idnifying which

yp of fls ss h SeL-351a is md

si fo h pson ding h LeDs nd

h LCD disply pnl. In ddiion, wo

pilo lmps inslld o indic whn

h atS swich is in h ON posiion ndwhn h atS is in opion. a bzz is

lso inslld s n dio indicion whn

h l is in opion.

7.0 System Normalisationth pocss o nomlis h spply

soc fom bckp bck o min fd

is dsignd o b don mnlly. this is

o void siion wh h tNB cnno

kp ck of hi sysms off poins.

8.0 Conclusionth implmnion of h atS schmin slcd tNB disibion nwok

sbsions will povid mndos

benets and advantages in increasing supply

libiliy. th schm is dsignd wih

psonnl nd qipmn sfy in mind.

th schm is qick o implmn nd

povid vl fo mony, compd o

implmning mjo infsc wok

o incs dndncy in h pimy

qipmn. Sinc is incpion in h

tNB Pk disibion nwok, h atS

sysm hs bn opd onc SSuBliong Si. th ffcd csom did

no xpinc ny inpion in pow.

Bsd on is sccss in Pk, h atS

sysm is sibl o b inslld in disibion

nwoks. thfo, ddiionl atS sysms

cn b implmnd oh sbsions wih

mlipl socs of spply. n

Above: The ATS indication light is on, showing

that it is in operation.Below: ATS installation in SSU SUKNegeri Perak, Ipoh.

REFERENCE

[1] Disibion Pocion Sysm,SeL engining Lboois, SeL

Solions 2007.

Tripping event at SSU Balairong Seri, Kuala Kangsar

Date of tripping Feeder Trip Tripping Time Interruption

1 03 Mar 2007 (Sat) Main 11kV Incommer, 1K5 2037hrs outage

2 18 April 2007 (Wed) Main 11kV Incommer, 1K5 1223hrs outage

3 10 Nov 2007 (Sat) Main 11kV Incommer, 1K5 0610hrs(ATS operated)

Nil

ATS installed at SSU Balairong Seri, Kuala Kangsar on 12 May 2007

**No tripping record at SSU Pejabat DUN incomming feeder