QUY TRÌNH VH và bảo DƯỠNG rơ LE RET 670

Trong mQt ca vfn hdnh phdi it nh6t hai lAn ki6m tra tinh trqng ldm viQc cria c6c ro le th6ng qua c6c thdng tin hi6n thi tr€n mdn hinh vd c6c ddn LED hi6n thi tfn hi6u.. Khi ro let6c dQng

TONG CONG TY EIPN LI/C DAU KHi VIET NAM

coNc rY DrEN Lr/c DAU rHi nl riNu

RO LE RET 670 HIT,U: PVPHTQTO3TVH wrA

F\of Frlt"*,oi*t" H"r Tirr$

Hd TTnh, thdng I2 ndm 2014

i c0nc ry DIEN r,Uc nAu xrri n,q riNn Mi hi€u tdi li6u:

PVPHTQTO3TVH

Ngdy hiQu lsc:

/12 t2014

NGTIOT Drlgc PHAN PH6r:

3. Dpi di€n lSnh tlpo vO chdt luo ng 01

CHU TRi SOAN THAO: ph6n xu&ng Vfln hdnh

Chu ky:

H9 vd t€n: Nguy6n Quy Ki6n

Chfc vp: Chuy€n vi6n

Chfr ky:

H9 vd t€n: Hodng Vdn Thg

Chtic v.u: Chuy€n vi€n

THAM GIA XEM XET VA GOP'f TTNN:

L Phdng K! thuAt - COng nghQ

NGTI chu

Hg vd t€n: Nguy6n Thanh Tirng

Chric vU: Ph6 gi6m d6c

t

cHl Ciro

,ra tUC

frlf,

- xAr

c1NGn'DrEN qrc ntiuxni a.4rimt

PVPower HT Quy trinh v$n hirnh vd bio dudng rcr le RET670 PVPHTQT03TVH

i';il;iiifiiii?; Ngdy hiQu lUc; Trang s6:

, t t2/20t4 3/t6

nANc rHEo nOr no suNG srln oor T,AN STIA PHIEU

ynu cAu NGAYSIIA TOM TAT NOI DUNG SI.IA DOI

c)uc ry pfir,r tU.c oAu riti s) ritra

PVPower HT iffiffir;iil;ffi Quy trinh v$n hdrnh iNs;tfiidil;:vi bio dudng rcr le RET670

I : t12/2014

MVC LUC

1 Muc ilich 5

2 Ph4m vi 6p dUng 5

3 Tdi liQu li0n quan 5

4 Tu vitit tat, gieithfch thuflt ngu 5

5 NQi dung 6

5.1 Quy tlinh chung vd an toan khi vfln hdnh hQ th6ng ro Ie 6

5.2 Nguy6n l!,, chirc nang cta ro le RET 670 6

5.3 VAn hdnh ro le RET 670 7

5.4 Cdcbdtthudng cta ro le vd c6ch xtrly 14

5.5 B6o tri ro le GRT670 15

c(iNG w ntF,N r qft- nlr r rrri rtl rimt

PVPower HT B;;hil';ifiiffi Quy trinh v$n hinh i N#thiiliil,vdr bflo dudng ro le RET670

I i t t2 I 2014

1 MUc dich

Quy <Iinh, hudng ddn cdc c6ng tric kiOm tra, theo d6i, thao tirc vQn hdnh ro le b6o vQ

mdy bi€nrip chinh vdmhy bi€n dp tg dirng RET 670 Nhd mrty di€n vfing Ang l.

2 Ph4m vi 6p dqng

Quy trinh ndy dugc 6p dpng cho t6t ch cdc ca vdn hdnh, vfln hdnh vien B6ng dipn, vfln

3 Tni liQu li6n quan

- 220KV HV Switchyard Protection System Tripping Matrix;

- Switchyard And Paintransformer package;

- Plant Protection System Protection Principle diagram;

- Unitl Auxiliary Transformer Protection principle Diagram;

- Unit2 Auxiliary Transformer Protection principle Diagram;

- Station Tranformer STI Protection And Measurement Principle Diagram;

4 Tir vi6t tfit, gieithich thuft ngil

MVB Thanh c5i trung 6p(Medium voltage busbar)

Nhat ky vfn hdnh

6

'cHl

r(iro

,tt

Phi6u c6ne t6c

PVPr{TQTO37V}l

c)NG Ty DrEN tU c oAu xai n) rinn

PVPower HT B;h;;ilia; Quy trinh vfn hinh ihiii i Nc;;hd vdr bio iu;,dudng ro le RET670 PVPftTQT03TVH

5 NQi dung

5.1 Quy ttinh chung vd an toin khi vgn hdnh hQ thiing ro le

Didu 1.

Khi ldm viQc v6i hQ th6ng ro le b6o vQ ph6i n6m vtng tfnh nbng, pham vi sri dung cria

tirng lo4i ro le, cSch thirc truy cflp vdo ro le khi vfln hdnh binh thuong, khi su c6 vd phdi tudn thri c6c biQn ph6p an todn theo c6c quy trinh quy phpm sau d6y:

- Quy trinh thyc hiQn PCT, PTT do Tdng C6ng ty ban hdnh kdm theo quy6t dinh s6 64s I QD-DLDK ngdy 12/ 8120 r0;

- Quy Trinh An todn DiQn, sO pVpValeT003AT.

Di6u 2.

Trong mQt ca vfn hdnh phdi it nh6t hai lAn ki6m tra tinh trqng ldm viQc cria c6c ro le

th6ng qua c6c thdng tin hi6n thi tr€n mdn hinh vd c6c ddn LED hi6n thi tfn hi6u.

Di6u 3.

Khi ro let6c dQng ili ciltthi}tbf hay c6 b5o ddng nhdn vi6n vfln hdnh phii truy cflp vdo

ro le vd biio ciio kip thoi cho trucmg ca, tru&ng kfp v€ lo4i su c6, thoi gian sdy ra su c6,

c5c th6ng sO ttri xhy ra sg cO Ae Hp thdi c6 bi€n ph6p kh6c phgc sua chf,a, nhanh

ch6ng gi6i trri sy cti clua thi6t bi vA tr4ng th6i sEn sdng ldm viQc.

Di6u 4.

Nh6n vi€n vfln hdnh chi clugc ph6p sri dpng c6c phfm chric ndng tqi mlttru6c cria ro le d6 truy cflp vdo ro le, tuyQt eOi ktrOng duoc thuc hiQn cfrc thao tdc kh6c c6 the gdy hu

h6ng cho ro le.

Di6u 5.

Nhdn vi6n vfln hdnh khdng dugc ph6p thay i16i mflt khAu vd c6c gi6 tri cdi dpt trong ro

le hay cdc thdng tin vO sy c6 luu trong ro le, c6ng viQc ndy phdi do <lorl vi chuyen m6n

th$c hi€n vd ph6i dugc su cho ph6p cria ldnh dpo ph6n xuong

Di6u 6.

Mqi c6ng viQc hiQu chinh, ki€m tra, sta chta ro le ph6i thuc hiQn theo phi6u c6ng t6c.

Kh6ng cho phdp ngudi kh6ng dring chric ndng, chua dugc ddo t4o vO chuy6n m6n truy

5.2 NguyGn lf, chric nlng cfia ro le RET 670

Di6u 7 Gi6i thiQu tdng quan

c1t'ta n'nrfrr,t Ltlc nliu KHf nl rimrr

Quy trinh vfln hAnh vdr bio duffng rcr Ie RET670

s;; hanh tln thii

I

i Ngriy hi€u lvc:

t 12 t2014

r rang so:

Ro le b6o vQ m6y bi€:n 5p RET 670ld mQt thitit bi b6o vQ thdng minh, cd cdc tfnh ndng

vQ cho cdc mdy bitin rip hai vd ba cudn ddy, miy bi6n dp e ngdu.

Giao diQn vfln hdnh cta ro le RET 670

Giao diQn ngudi mriy (HMI) duqc sir dung <t6 gi6m s6t vd tli6u khi6n vQn hdnh IED (Intelligent Electrical Device), c6c giao diQn vfln hdnh cua c6c role k! thuflt sO egg ta

th6m c6c chric ndng brio clQng dti c6nh bdo cho ngudi v4n hdnh.

STT

Chri'c

nlng bfro

vQ

M6 te

Bio vQ MBA chinh (r0t20BAT01)

86o vQ MBA

tg dr)ng (00BCT01)

Chric ndng b6o vQ ry6y bi6n 6p,

trong m6y bi€n 6p.

Chric ndng b6o v6 qu6 dong cit

nhanh vd c6 thdi gian phU thuQc.

4 50/5 lN

Chfc ndng b6o vQ qu6 ddng

chpm dat phia cudn ddy cao 6p

mhy bi}n 6p.

5 59N Chric ndng b6o vQ chdng cham

ddt theo nguy6n tdc qu6 6p. X X

6 24 Chric ndng b6o vQ qu6 tu thdng

5OBF Chric ndng- b6o vQ chdng hu

5.3 V$n hdrnh rcr le RET 670

PVPower HT I i iilffiilia;ffi;****'O"v trinrr v4n

Hinh 1: Ro le b6o vQ RET670

Bdng di€u khi6n bao gdm circ phim tti6u khi0n duoc sri dpng 116 gi6m s6t vd vdn hdnh

IED Bing ctiAu khi6n dugc minh ho4 nhu hinh 2.

Hinh 2:Bhngcti6u khi€n HMI

Di6u 10 Chric ndng cira cilcphim cli€u khi€n

Cric phim dugc srl dgng d6 van hdnh IED dugc m6 td trong b6ng sau:

PVP}ITQTO3TVH

t-,tiut t t t utF,N t,t,l' ttlt t t' ul Hl r'littt

PVPower HT Quy trinh vfn hirnh vdr bio dufrng ro le RET670 PVPT]TQTO37VH

^!r rang so:

9/16

iffi;d;hiilii;r; iNdtl;le;ft,

Chfc ning

Phim ndy dt5 d6ng m6y chthodc dao c6chly

Phim ndy cl€ m0 m6y cit ho{c dao c6ch ly

Phfm ndy c16 md danh muc chfnh vd di chuy€n dtin c5c mdn hinh m{c

tlinh

Phfm ndy <tO lpa chon ctr6 e6 di6u khiiSn LocallRemote cho IED

Phfm ndy dO md mdn hinh Reset.

Phim ndy d€ uat oAu ctrti aO soan th6o vd x6c nhfln nhtng thay cl6i cdi d{t

khi 6 trong chi5 dq nay.

Phim ndy tl6 di chuyOn l6n gifra c6c mdn hinh vd dich chuytin sang ph6i

i ^

trong ch6 dQ soan th6o.

Phfm ndy t16 di chuytin xu6ng gitra cdcmdn hi vd dich chuy6n sang

triii trong cfr6 OO so4n th6o.

Phfm ndy i16 di chuyi5n l€n trong so 116 mQt sgi vd menu dpng c6y.

Phim ndy tto di chuytln xuong trong so dd mQt sgi vd menu dqng cdy.

Di6u 11 LED hiOn thf trpng thdi cinro le RET670

Ba ddn LED tr6n bdng cli€u khi6n cung c6p cric th6ng tin nhu bdng dudi rt6y:

6

cBl

r(iro

vrC c6 x€il rl

Din mdru xanh:

Sdng

coNG rY DrEN tt/ c oAu xnin) riua

PVPower HT ffid;i;id;ift; Quy trinh v$n hdnh ! Nfit;ic;i;;;vdr b6o dudrrg ro le RET670

I i t 12t2ot4 t0t16

PVPHTQT03TVtI

Din mdru vdrng

Din mdru d6

Didu 12 Xem c6c th6ng tin chung vA sg co

Dd xem c6c thdng tin chung su cO nhu: s5 thri tg, thdi gian xhy ra sy cO, vi tri l6i, l6p

lpi l6i, tfn hiQu xhy ra,truy cflp vdo dudng d6n sau:

D i sturb ance records lManual trig

Di6u 13 Truy xu6t c6c sp kien b6t thudng trong ro le

C6c sg kiqn b6t thudrng dugc ghi nh4n lpi trong ro le, thdng tin v€ sg kiQn b5t thudng

dugc m6 ti nhu: sO ttui tU, thdi gian vd ngdy cria b6t thudng De xem c6c sg kiQn b6t

thuong truy cflp vdo dudng ddn sau:

Disturbance records/Record xx/Indications

Di6u 14 Xem chc gi|tri trip

ni

fJ€ xem cdc giit tri trip truy cflp vdo dudng dAn sau:

Disturbance records/Record xx/Trip v

Giai tru c6c ddn tfn hiQu (reset led)

Gi6i trir ddn kh0i itQng vd ddn sg c6 tpi dudng d6n sau:

MQt hQp thopi hi6n ra, chgn " YES " di5 Reset

Gi6i trir tdt ch ciic ddn tin hiQu tai duong d6n:

MQt h6p tho4i hi6n ra, chon " YES " diS Reset

Di6u 16 Giai trt tin hipu lockout

-i,

Reset chr?c ndng "lockout" Ae A6 gd b6 diAu kiQn lockout

-ll3.t uir

c6nc

lc olr

t taA

.la T'

LDNU \'y D]L:N LI)L'\AIJ KHI HA TIun

Quy trinh vfn hdrnh vir bio dudng ro le RET670

B;ffii;ia;;iili i N;;tb,c" il;;

MQt hQp thopi s0 hiQn ra, chgn ")|ES ,,d6 Reset.

Di6u 17 Giai tru tfn hiQu bO ctrim

so lAn tg dQng d6ng l4i ngu6n diQn, b0 d,€m m6y c6t, b6 d6m xung vd bQ d6m c6ng t6c

mpch di0n dugc Reset d " Reset counters " trong HMI, 116 giai trtr tin hiQu bQ d6m truy

MQt hQp thopi s€ hiQn ra, chon "yES ,,d6 Reset

Didu 18 Xem c6c thdng s6 vfln hdnh

1) Truy xu6t dfi liQu

Dgc c6c gi6tri vd truy cQp cilc thdng tin v0 c6c d6i tuqng dugc gi6ms6t, v6n hdnh ph6i truy xu6t "menu tree" bing cSch sri dung c6c phim mti t6n, cdch truy xu6t dugc thqc

hiOn nhu sau:

- Nh6n phim "tr' dd di chuy6n tir tri so d6 mQt sqi 6n Submenu mong mu6n

- St dung phim "-)" d€ di chuytin xu6ng phia du6i tr€n HMI tree cho dtln khi

th6ng s6 mong mu6n dugc hi€n thi

- Nh6n cl6ng thoi phim "c" vdphim "I" d6xem trang mdn hinh th6ng s6 ti6p theo.

- Nh6n it6ng thdi phim "C" vdphfm "1" d6 trO lai trangmdn hinh th6ng sO ti6p

theo.

- Sri dung phim "<-" d€truy xu6t c6c luu trfi trong Menu tree.

2) Xem c6c thdng sO v@n hdnh

Di5 xem c6c th6ng s6 vfln hdnh nhu ddng diQn, diQn 6p, tdn s5, cdng su6t bicu kitin,

c6ng su6t tdc dung, c6ng sudt ph6n kh6ng vd hQ sd c6ng su6t v4n hdnh vi6n truy c4p

theo dudng d6n sau ddy:

MeasurementsAylonitoring/S ervice values(MMXUySVR

3) Xem cdc giStri tuong tg phfa so c6p

Xem c6c giri tri tuung tg phia so c6p bAng c6ch truy cflp vdo duong dAn du6i ddy:

IONG ry DrEN trlc u,4u xni a) riwn

PVPower HT B;;hfifiA;iil Quy trinh vgn hinh iNClyr,lii"iri",vi bio du6ng ro le RET670

Measurement/Analog primary Values

4) Xem c6c gi6tri tucmg tg phiathit cdp

Xem c6c gi|tti tuong tu phia thri c6p bing crlch truy c4p vdo dudrng dfin dudi <ldy:

Measurement/Analog s econdary Values

5) Xem gi6 tri ddng <IiQn pha

Ei5 xem ddng diQn cria 3 pha vd g6c pha cria chfng, truy cflp theo dudn g ddndu6i d6y:

Me asurementsAvlonitoring/Current phas orlCpxx

6) Xem gi6 tri diQn dp pha

Xem gi5 tri diQn 5p 3 pha vd g6c pha cria chring bing c6ch truy cflp theo dudng dfln

du6i <l6y:

Me asurementsAylonitoring/Voltage phas orlVpxx

Di6u 19 Doc vd thay c16i cdc giittri cdi rldt

Cdc gi|tri cdi dflt c6 th6 xem vd thay dOi duqc trong "setting Group N,', dudi il6y sO

Th6ng sd cdi d4t rluqc thay tldi theo c6c bu6c sau:

a Truy xu6t thdng s6 mong mu5n bing cdc phfm mfii tOn.

c Di chuytln giira cdc so tnn tg hoflc c6c ky tg bing c5ch sri dung cfrc phim,,<-,,

vd tt+".

d Sri dpng ciic mfri ton lOn vd xu6ng diS thay aoi so thf {r hoac ky tu li0n quan.

Nhdn phfm "8" v1i m6i thay d6i mong mu6n dd duoc ldm.

Nh6n phim "(-" d6 dich chuy6n l6n trOn mQt mric d trong HMI tree.

Nguoi vfln hdnh se dugc nhic nho di5 x6c nh0n su thay d6i, sri dung c6c phfm

"<-" vd "-)" d€ di chuy€n gifra "yes" hodc " No" 0 tr€n cria s6 hi€n ra vd nh6n

phim "E" dC x6c nhQn.

2) Xem, cdi clat gi|tri thoi gian cria hQ th6ng

Ducmg d6n trong HMI nhu sau:

Settings/General Settings/Time/Syem time

e.

f

g.

C)wo rY ill':tt LUI DAU IiHl HA TINH

PVPower HT B;;d;ilU;iffi; Quy trinh vfn hirnh vir i N#tiile;i;;.bio dudng ro Ie RET670

3) Xem cilc gi|tri diQn dp ddy

Eudng ddn trong HMI nhu sau:

Settings/General settings/ Monitorin gNotage phasors/phase - phase

4) Xem, cdi clat gi6tri b6o vQ so lQch t6ng tr0 cao

Settings/Setting group N/Differential protection AlighlmpDifferential IIIZD.

5) Xem, cdi dpt gi|tri b6o vQ khodng c6ch

- Xem c6c gi6 tri diQn trd, dipn kh6ng cdi dflt cria b6o vQ khoang c6ch 2l vfln

- Xem hu6ng t6c dQng cria bdo vQ truy cflp vdo iludng d6n sau:

Settings/Setting group N/Distance protection/Directionallmpedance

Xem, cdi dpt gi6tri bio vQ qu6 ddng c6t nhanh

Truy cfp theo dudng d6n sau:

Settings/Setting group N/Current protection/BreakerFailure(RBBFyBFp

Xem, cdi d4t gi|tri b6o vQ qu6 ddng chpm Aat chtnhanh

Truy cdp theo dudng d6n sau:

Settings/Setting groupN/Current protection/InstResidualOvercurrent(plOC) /IEF

Xem, cdi d4t b6o vQ l6i mriy c6t SO gp

Truy cdp theo tlucmg d6n sau:

Settings/Setting group N/Current protection/BreakerFailure(RBBFyBFp

6)

6cHt I

(irs r

:11tu vr9r

c6rr

7)

8)

9) Xem, cdi ddt gi|tri b6o vQ rliQn 6p th6p

Truy cQp vdo duong ddn sau:

Settings/Setting group N/Voltage protection/UnderVoltage2Step(pTuv)/TtIv

10) Xem, cdi c14t gi|tri bdo vQ qud 6p

Truy cflp vdo dudng d6n sau:

Settings/Setting group N/Voltage protectection/OverVoltage2Step(pTov)/Tov

11) Ki€m tra ddng bO (25)

Truy c{p vdo ducrng d6n sau:

PVPITTQT03TVH

r rang so:

t3/16

coNG TY DrEN Urc nirr rni n4 riln

PVPower HT Quy trinh v$n hdrnh Ngay vir hiQu bio luc:du0ng ro le RET670

/t2/2014

12) Xem, cdi dat chric ndng tg rlQng d6ng l4i ngu6n diQn

so tAn d6ng, md titip ditim dugc cdi dat vd truy xu6t qua dudng d5n sau

Settings/Setting group N/Control/AutoRecloser(RREc)/AR

Di6u 20 Kitim tra trong v4n hdnh

- Trong m6t ca vfn hdnh phhi itnh6t hai lAn ki6m tra tinh trungldm vi€c cria cdc ro

le thong qua c6c th6ng tin hitin thi trOn mdn hinh vd cdc ddn LED

- Tinh trpng ldm viQc cta b0 x6y, nt5u kiOm tra phdthiQn th6y trong role hodc trong

tt dAt role c6 xuAt hign d6u hiQu tich t9 Am hoflc bsi (b6m tr€n mflt kinh phia

trong) cAn ph6i tim ra nguy€n nhdn vd xt ly ngay.

- Trong phong vfln hdnh cdc thi}t bi role, cto ludng vd ty dQng di€n, cdc m4ch nhi

thri ph6i ddmbilo c6c cti6u kiQn (nhiQt dO, dO 6^, ) theo quy chu6n k! thu6t tt6

- tdt ch cdc kitim tra d6i vdi role ph6i ctuqc ghi vdo nhflt ky vdn hdnh Nhtng ph6t

hi6n kh6ng binh thudng cflng ph6i dugc ghi lai dAy iln d6ng thoi bdo c6o TC,TK

C[rcbdt thulng cria ro le vi cfch xfr ti

21 Xt lli sg cti ro le t6c itQng

Khi c6 sp cO ro le t6c dQng, nhdn vi€n vfn hdnh phdi ghi l4i trqng th6i cbc rtdn LED,

ghi nh4n th6ng tin sy cO trong bd ghi su c6 cta ro le vd thuc hien bdo cdo theo quy

tlinh

Di6u 22 C6c 16i thi6t bi thucrng gflp

Khi c6 l5i xu6t hiQn, c6c th6ng tin v6 r6i dugc hi6n thi t4i dudng d6n sau:

Main menu/Diagnostics/IED status/General

Cacbdtthudng thitit bi, nguy6n nhdn t6i va c6ch xri ly duqc mO t6 theo b6ng du6i d6y:

=

'xirr

.dilo

: oft

raAl

OT\

: oIu

rfux

9

STT Tin hiQu tr6n

01 Intern Fail C6 l6i nQi bO bdn trong ro le

- Ki€m tra cdc b6o dQng

khric dtin tim ra nguy€n nh6n l6i

02

N[IM-mod

Warning

Bat thudrng li6n quan d6n

thdi gian cria hQ th6ng:

- Ddng frO ttrUi gian thuc;

- Cdi ddt lai thoi gian

cho rcr le.

03 NtlM-Modfail Fail Main processing module bi

rot,

- Ki6m tra sua chfra

I r rr rr I r rle 1{I lh/t

PVPower IIT Quy trinh vfn hdrnh vir bio du0ng rcr le RET670

15/16

04 ADC module fail Md ilun chuy€n d6i AD bi

lol

- ki6m tra sria chtia m6

05 CANP 9 BIMI Fail MO dun IO bi l5i

- Ki6m tra m6 dun IO dugc cdi rlat va k6t nOi

t6i khoi IoP- I

- Kii5m tra sta chfta M6 ilun IO

Warning

reset.

- Cdi df;tlai ttdng hd

thdi gian cta ro le

07 TimeSync Warning Mdt d6ng bQ thoi gian.

- Ki€m tra ngu6n thdi

gian d6ng bQ.

08 BIMnn Fail Md dun ng6 vdo sd tht n bi

l5i 1nn s6 module)

Ki€m tra sta chiiaa

A a r rX.

mo oun Dr lor.

09 BOMn Fail M6 dun ng6 ra s6 thri n bi

l6i

10 IOMn Fail M6 dun ng6 vdo/ng6 ra thri n

bi l6i

l1 MIMn Fail M6 dun ngd vdo mA (MIMI)

bi l5i

l2 OEM Fail Optical ethernet module bi

l5i

5.5 Bio tri rcr le GRT670

Di6u 23 Hu6ng ddn thdo vd lEp IED

c6ng viQc th6o vd l6p dat IED ducvc thuc hi€n theo cdc bu6c sau:

t1 thtngudn diQn I chi6u c6p cttin m6 dun.

2) Ngdn mpch m6y bi6n dong sau d6 ng6t todn bQ c6c t6t nOi ddng cliQn, iliQn 6p tir

IED

3) Th6o tdt ch cdc ddy tin hiQu bing cdch go female connector.

a) Ngft t<6t nOi sgi ddy c6p quang

5) Th6o c6c con vft tr€n t6m chinh phia sau IED.

6) N6u thay m6 dun miiy biiln rip:

- Th6o IED tt bing ili€u khi6n

- Th6o t6'mphiasau IED

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c1NG ry DrEN LUc D,4u KHi n) ri\a