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Phc trnh tp s Phn xng Vn hnh Bun Kup

H THNG IU TC

1. M T H THNG DU IU TC1.1. Mc ch:

iu tc c dng vn hnh tuabin di ch iu chnh t ng vbo v t my chng vt tc.iu tc cung cp nhng chc nng sau y:

+ Chng trnh khi ng t ng t my v chy n ng b v tc hoctn s ca mng li in.

+ Lm n nh tc ca t my vn hnh ch khng ti hoc khi lmvic khng ho mng.

+ Gi cng sut t my c nh theo thng s ci t.+ iu chnh t trung tm iu khin bng phng php vn hnh t ng.+ Gii hn cng sut hot ng ca my pht.+ Dng t my bnh thng.+ Dng nhanh t my.+ Dng khn cp t my.

Tuabin c th c iu chnh nh sau:+ iu khin t xa ti phng iu khin trung tm trn h thng OPS+ iu khin ti ch bng iu khin s GC431 kt ni vi my tnh( tham

kho di y bng iu khin GC431) (iu khin ti ch v iukhin bng tay).

+ B iu tc gm nhng thit b sau:+ Bng iu khin GC431.+ B tch p AU.+ C cu phn hi c kh.+ H thng ng khn cp ECS.+ Thit b an ton vt tc OSD.+ Thit b ph.

1.2. Thng s k thut:+ p lc hot ng :6.3Mpa+ ng knh bnh thng van t l :35mm+ Dung dch lm vic :T-30 du tuabin+ ht trong dung dch lm vic :10m+ Nhit du lm vic :10 - 50 0C+ Dng iu khin van t l :4-20mA

Thc hin: V ng Ngh 133

5

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+ in p cung cp cho van phn phi :24 v 220V+ in th cung cp cho bng iu khin : GC431+ V DC(2 ngun) :2x220+ VAC :220/50Hz+ Phm vi iu chnh tc , % ca fnom :88-115

+ Tc gim hon ton bp,% :0-10+ Di cht ca iu chnh tc ,% :0-2.5

1.3. Cc thit b chnh:1) B tch p

B tch p dng iu chnh servo cnh hngB tch p c kt ni vi:

+ Bng iu khin GC431 bng cp

+ H thng du p lc, servo v phn t iu khin ca h thng ng cnhhng khn cp.

+ Van tit lu PV dng chuyn i tn hiu in t bng iu khin GC431tr thnh tit lu dng chy du cung cp cho bung iu khin servo cnhhng.

+ Van phn phi DV vn hnh bng tay v cun dy trang b vi cc cm binti cc v tr ca van SQ1 v SQ2 ca v tr ng, dng pht ra tn hiu


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sng sng cho khi ng v dng khn cp t my. V tr a ca van phnphi tng ng vi lnh khi ng, khi v tr b th tng ng vi lnhdng 1 v dng 2.

+ ng h p lc PG dng hin th p lc du vo ca b tch p v truynmt tn hiu in sng sng cho khi ng.Thit b bo tn hiu p lc ca

ng h p lc c t bng tay cho s liu p lc du thp khn cp v plc du gim di s iu chnh ny.

2) C cu phn hi c kh:C cu phn hi c kh dng chuyn i m ca cnh hng thnh tn

hiu in.C cu phn hi c kh bao gm:

+ My pht tn hiu phn hi vi v bc vmt nam chm

+ Nhng gi c nh my pht phn hi

trn servo cnh hngV bc my c lp chc chn trn gi

v kt ni vi v servo cnh hng (xilanh).Nam chm th c c nh trn cn xilanh.

V tr ca nam chm c b truyn tnhiu xc nh gi tr ca tn hiu dng in ragi n bng iu khin GC431 tn hiu v tr

phn hi ca c cu phn hi servo cnhhng.

My pht tn hiu cung cp tn hiu ra t4-20mA. Tng ng vi 4mA th ng cnhhng hon ton v 20mA th m cnh hnghon ton.3) H thng ng khn cp:

H thng ng khn cp ECS l s tphp ca cc thit b in v thu lc dng ng cnh hng khn cp trn khi nhnc lnh stop3 khng ph thuc vo b tch p.

H thng ng khn cp gm nhng thit b sau:+ Van khn cp DV+ Van tit lu TD+ Phn t iu khin CU+ Cng tc p lc PS vi mt van+ Khi nhn lnh stop3 th cc thit b trn hot ng nh sau:+ Cun dy YA1 c in


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+ C hai van phn phi ca phn t iu khin dch chuyn n v tr a+ Van khn cp chuyn n v tr b khi ng AU khng kt ni n

bung iu khin servo cnh hng v ng thi iu khin bung servocnh hngcho ng l kt ni vi ng ng p lc trong khi bung iukhin cho m l kt ni vi ng x qua van tit lu

+ Cng tc p lc PS thng bo khng c p lc trong bung iu khinca van khn cp.

+ Cnh hng ng vi tc xc nh qua ming van tit lu TD+ Thit b ca b ng cnh hng khn cp c t li v tr ban u bi tn

hiu cung cp n cun dy mt in hoc n nt4) Van khn phi

Van khn cp dng tho kt ni b khing AU n bung iu khin servo cnhhng v ng thi cnh hng ng khn

cp.Van khn cp l van 4 v tr. ng ra kt

ni ng thng vi bung iu khin ca servocnh hng. Pittng ca van khn cp c ttrong mt ng lt t vo trong mt v. Pittnggi nhng v tr trong s Bk-5071-001.din tch mt cui ca bung iu khin th lnhn din tch bung iu khin i din(bung ly tn hiu qua van DV s c dintch ln hn). v tr ny du t do i qua t b khi ng AU n cung cp cho

servo cnh hng.Nu bung iu khin ni vi ng x, pittng van khn cp dch chuyn

n v tr van khn cp v tr cho m.

Van tit luVan tit lu l thit b dng iu chnh thi gian ng cnh hng bng

phng php dng t my khn cp.Van tit lu gm c mt v vi mt pittng (t bn trong v) y l b phn cth thay i(dch chuyn).V tr ca pittng vi v s xc nh c thi gianng cnh hng khn cp.

Phn t iu khinPhn t iu khin dng iu khin van khn cp v gm c van iu

khin DV1 v van chnh DV2 v xilanh ph C.Van iu khin c vn hnh bng cun dy v bng nt n(tay) n dng

iu khin van chnh.Van chnh l van c iu khin bng thu lc v bng tc ng ca xilanh

thu lc, n dng iu khin van khn cp.


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Xilanh ph dng iu khin van chnh bt chp van iu khin tc ng v tr no. Bung iu khin ca xilanh c kt ni vi van an ton vt tcDV(OSD). Khi p lc du cung cp n bung iu khin, pittng ca xilanh phdch chuyn van chnh n v tr a nh vy lm dch chuyn van khn cp nv tr cho ng.

Cng tc p lcCng tc p lc PS dng sinh ra mt tn hiu in cho s c hoc thiu du

p lc trong bung iu khin ca van khn cp.N l mt pittng vi phn cn nm bn trong v cng tc p lc. Tip im

ng sy ra mi thi gian p lc x/cung cp vo trong phn trt.5) Thit b an ton vt tc

Thit b an ton vt tc OSD l tphp cc thit b c thu lc dng bo vt my trnh chy lng tc.

Thit b an ton vt tc gm c:+ Mt my chuyn i li tm+ Van an ton vt tc DV

Vi tc t my tng ln trn tc ln nht cho php, chi tit di chuyn camy li tm dch chuyn tc ng ln tay n ca van an ton vt tc. Khi iuo sy ra pittng ca van dch chuyn, kt ni bung iu khin ca xilanh phC(CU,ECS) vi ng p lc.Van an ton vt tc c kim sot bng cc cng tc SR1 v SR2 c gn ln

trn v(khung) ca n. Phn t ca thit b an ton vt tc c tc ng bngtay tr v trng thi ban u.6) Thit b ph

Lc kp dng lc sch duLc b tc th hin th bi cm bin p lc SP(DF). Khi mt b phn ca lc

b tc, n c th thay th hoc t lm sch m khng dng t my bng cch thaylc ny bng lc khc.

Van tit lu vi van mt chiu th dng iu chnh thi gian ng m cnhhng vi t my vn hnh ch iu khin t ng, thng s thi gian ciu chnh bng cch iu chnh vt trn khung(thn) van tit lu vi van mtchiu TCV1,TCV2(FCU). Van tit lu TCV1 dng iu chnh thi gian ngcnh hng. Van TCV2 dng iu chnh thi gian m cnh hng.

B phn kho iu khin c dng kho iu khin cnh hng. Van titlu thu lc TV(CU) dng thay i tc kho cnh hng. Van iu khinDV(Cu) dng thay i iu khin kho.


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1.4.2. Phng php iu khin t ng Khi ng t my tc khng ti.

Trng thi ban u v v tr ca thit b:+ H thng du p lc c iu chnh v di phng php iu khin t

ng

+ Bng iu khin GC431 c kim tra v di ch iu khin t xa.+ Van khn cp sn sng cho vn hnh.+ Cun dy YA1 v YA2 ca van iu khin DV(AU) khng c in van iu

khin v tr bKhi lnh khi ng c cung cp cun dy YA2(DV,AU) c in t bng

iu khin GC431. Van iu khin DV(AU) dch chuyn n v tr a. Bungiu khin ca van iu khin kt ni vi ng p lc. Lc kt qu l vankhn cp DV(ECS) kt ni vi van t l PV(AU) vi bung iu khin ca xilanhcnh hng.

Bng iu khin GC431 sinh ra tn hiu n iu khin van t l PV(AU) v tcnh hng v tr tng ng v tr m ban u.Khi t my t c 90% tc hot ng th cnh hng c t v tr btu tc m 2. S liu ny c xc nh bi phm vi ca tc iu khin tc khng ti. S chnh xc trong bo dng th tc quay khng ti cxc nh bi s iu chnh a vo trong bng iu khin GC431 cho tc khng ti.

Dng t myVi lnh dng t my bnh thng(stop 1) cung cp bi mt tn hiu iu

khin v tr cnh hng c nhp vo mch. Cnh hng vn ng lm t myt n tc chy khng ti.Cng tc (my ct)my pht c ngt i.Tn hiu thu c v v tr ngt my pht nh trn, cun dy YA1 cin(DV,AU) l c in. Lc kt qu l bung iu khin ca van iu khinDV kt ni vi ng x. Van khn cp DV(ECS) khng kt ni vi van t lPV(AU) t bung iu khin ca xilanh cnh hng, cnh hng ng. T mydng.

T my vn hnh di tiT my vn hnh di ti c th iu khin tn s s thp hn hoc iu

khin cng sut.Trong trng hp c s lch v thng s cng sut hin th vi gi tr ca trngthi n nh, mt tn hiu iu khin c sinh ra i vo mch iu khin v trca xilanh cnh hng kh sai lch ny. Tn hiu iu khin ny lm dchchuyn pittng ca van t l PV(AU) v do , p lc khc i vo bung iukhin xilanh dch chuyn.


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c nh trn th p lc khc phi dch chuyn pittng ca xilanh, m ca cnh hng thay i. Tn hiu t c cu phn hi c kh b tn hiu lchvo trong mch iu khin. Nh vy mch iu khin s a t my n mttrng thi cn bng mi, v pittng ca van t l PV(AU) chim mt v tr ng trng thi cn bng(trung lp).

Xa tiKhi b xa ti th t my pht, mt tn hiu cho ng c cung cp n van

t l PV(AU). Kt qu l cnh hng di chuyn theo hng ng vi tc lnnht cho php tun theo thng s bo m ca iu tc.Tc gim n tc hot ng. iu tc lm cho cnh hng tng ng vivn hnh khng ti qua van t l PV(AU)

Dng t my vi lnh dng 2Dng nhanh t my dng 2 nu l do khng kt ni vi tc , th tin

hnh theo trnh t sau:

+ Cun dy YA1(DV,AU) c in thng qua bng iu khin GC431.+ Bung iu khin ca van khn cp DV(ECS) kt ni vi ng x.+ Cnh hng di chuyn ng vi tc ln nht.+ Van t l PV(AU) th dch chuyn cho ng. Lc cng sut gim n 0%

th ct my pht v dng .


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2. M T H THNG IU TC K THUT S2. 1. S khi:

T s khi ca h thng iu tc turbine (bn v s 5071-070) ta c th rtgn cu trc v mt s khi nh sau:


REGULATOR

Turbine

ACTUATOR

Phn to lng

Phn tKhuch

i

t v iuchnh tn s

C cuPhn hi

Phn tChphnh

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2. 2. S nguyn l:

Cc khi c bn


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Regulator: b iu khin v in.


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Gii thiu cu to b iu tc k thut s: Regurlator :

B iu khin in, iu khin chnh xc tn s v ti nh b iu khin PID.Tt c cc im t nh tn s, ti, gii hn ti u c a vo phn mm iutc (b iu tc c cu hnh d phng kp c v phn cng v phn mm)

+ B o lng tc :Dng chuyn i mt cch t l vn tc ca turbine - my pht v tn hiu

s dng trong b iu khin (s dng 3 cm bin tc MFA40-CS050, CS051,CS052)

+ 65F (b t tn s):Dng t tc quay ca turbine-my pht khi khng ho vo h thng

li in. B iu chnh PID s xc nh im t cho servomotor iu khincnh hng bng cch tnh ton s sai lch gia gi tr t v tc thc t.+ 65P (b t ti):

Dng t gi tr ch ca ti cho my pht khi ho my pht vo liin h thng.

+ Gii hn m cn gt 77:L mt phn t in c chc nng gii hn m cn gt thay th cho cc

iu khin c hc. Gi tr iu khin t u ra b PID (PI) s c so snh viga tr iu khin ny thng qua chc nng Min, Max t a ra gi tr iu

khin nh hn hoc ln hn.+ B t gi tr Speed droop :

Dng t c tnh dc iu chnh cho t my. Tn hiu sai lch ca vo b iu khin PID bao gm hai tn hiu sai lch v tc v ti, thchin c php ton tng ca hai tn hiu trn, cn quy mt trong 2 tn hiu vtng ng t l. Theo c tnh thi gian p ng ca tn s hoc ti la chnkhu PI(i vi ch Control Load) hay PID(Control Speed)

+ B o lng m cn gt:Chuyn i t tn hiu v tr ca cc servomortor iu khin cn gt sang tn

hiu s hoc tng t cung cp cho b iu khin in.+ B khuch i:

Khuch i gi tr ca dng in iu khin thnh tn hiu in i n cc bchuyn i iu khin van.


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16-B5. Dieu Toc 5R