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BV rle v t ng ha GV: NG TUN KHANH 1
Company
LOGOGV : NG TUN KHANH
i hc quc gia Tp.HCM
Trng i hc Bch Khoa Tp.HCM
1
TI LIU CHNH
Cc file power point mn hc BVRL ng Tun Khanh Bo v rle &TH
Nguyn Hong Vit Gio trnh bo v rle (1999) Trn Hu Thanh Tnh ton ngn
mch v chnh nh bo v r le v
trang b t ng trn Hong Hu Thun Bo v rle &TH L Kim Hng v on
Ngc Minh T Cc ti liu khc: ti liu nc ngoi
2
1. ND 1: TNG QUAN2. ND 2: CH LM VIC CA IM TRUNG TNH3. ND 3: GIN
VECTO CA CC DNG S C4. ND 4: KH C IN O LNG5. ND 5: BO V QU DNG IN6.
ND 6: BO V QU DNG IN P-H S C CHM T7. ND 7: BO V DNG IN C HNG8. ND
8: BO V SO LCH9. ND 9: T NG LI10. ND 10: HA NG B11. ND 11: BO V MY
BIN P12. ND 12: BO V NG C13. ND 13: BO V MY PHT14. ND 14: BO V
THANH GP15. ND 15: BO V NNG CAO TNH N NH
NI DUNG
3
Trong vn hnh HT c th xut hin tnh trng s c haych lm vic khng bnh
thng ca cc phn t. Lcny, hin tng l dng in tng cao nhng in p
lithp.
Nh vy mun HT hot ng bnh thng tr li th HTphi c h thng bo v rle
pht hin s c v c lp ncng nhanh cng tt.
ND 1: TNG QUAN
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Nhim v bo v r le
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BV rle v t ng ha GV: NG TUN KHANH 2
1.1 LCH S BO V R LE
1.2 CC DNG S C TRON HT
1.3 CC YU CU
1.4 M S R LE
1.5 S MU
1.6 NH SN XUT
ND 1: TNG QUAN
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S dng nguyn tc in t
S dng nguyn tc cm ng
S dng linh kin bn dn, vi mch
S dng k thut vi x l
1.1 Lch s r le
6
K thut ch to rle
7
Thi gian va qua chng kin bao thay i to ln trongcng ngh ch to rle
bo v.
Rle in c rle tnh
Rle digital rle numerical
Mi th h rle u c ci tin v kch c v cc chcnng, cp tin cy khng ngng
c nng cao.
1.1 Lch s r le
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1.1 Lch s r le
Relay in c
y l th h rle u tin dng cho h thng in, c lch s gn 100 nm. Loi rle
ny lm vic trnnguyn l in c, lc in ng tc ng lm c cuhot ng khi c tc
nhn kch thch...
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BV rle v t ng ha GV: NG TUN KHANH 3
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1.1 Lch s r le
Relay tnh (Static relay)
Thut ng tnh ch rng rle loi ny khng c cc bphn chuyn ng. Trong phm
vi bo v, khi nim "tnh"mun ni ti vic khng c phn chuyn ng to ccc tnh
ca rle.
Rle tnh c gii thiu vo u thp nin 60. Thit kca n da trn nhng thit
b in t tng t thayth li st v nam chm to ra ng c tnh ca rle.
Mi rle loi ny ch yu vn b gii hn trong 01 loi bov. c th bo v a
chc nng, ngi ta phi ni nhiuhp rle li vi nhau. 10
1.1 Lch s r le
Lp trnh cho rle tnh cng gii hn vi mt vi hm cbn iu chnh ng c tnh
ca rle.
Nh vy, rle tnh l s thay th cc phn in c bngmch in t tng t, vi mt
vi thit lp thun tin hn,tit kim hn v khng gian
Relay tnh (Static relay)
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1.1 Lch s r le
R le k thut s (Digital relay)
S ra i ca Digital relay l s pht trin mi trong bo v rle. Vi x l v
vi iu khin thay th nhng mch in tngt dng trong rle tnh thc thi cc
chc nng.
Nhng digital relay u tin c a vo khong nhng nm80, v vi s ci thin
khng ngng kh nng ca n, n naydigital relay vn c coi l cng ngh hin i
cho rt nhiung dng.
12
1.1 Lch s r le
So vi rle tnh, digital relay a vo b chuyn i tngt/s cho mi i lng
tng t o c, s dng vi x l thc thi cc thut ton bo v.
Digital relay c th thit lp thng s rng hn v chnhxc hn rle in c
hay rle tnh. N c th giao tip vicc my tnh iu khin
R le k thut s (Digital relay)
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1.1 Lch s r le
R le k thut s (Numerical relay )
S khc bit gia digital relay v numerical relay nm trnquan im hon
thin v cng ngh ch khng phi nguyn l bo v. C th xem y nh mt s pht
trint nhin ca digital relay nh mt kt qu ca s tin btrong cng
ngh.
Chi ph vi x l v cc thit b s lin quan (b nh, cng ravo,...) ngy
cng gim, dn n vic tip cn cngngh ny theo cch s dng mt thit b phn cng
n x l mt lng ln cc chc nng (one-box solutionapproach).
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1.1 Lch s r le
S dng b vi x l a chc nng cung cp cho rlekh nng tnh ton cn thit i
vi mt s lng ln ccchc nng m trc y c thc thi trong cc phn tphn cng
ring bit. Tt c ch gi gn trong mt phncng.
Chnh v vy ch cn mt li ca numerical rle cng c thlm cho rt nhiu
chc nng b ko theo, iu ny khc vivic cc chc nng khc nhau c thc thi bi
cc thit bring
R le k thut s (Numerical relay )
S c: Ngn mch N(3) , N(2) , N(1) , N(1,1) , ngn mch ccvng dy
trong MBA, ngn mch gia cc vng dy trongmy pht in.
Trng thi khng bnh thng: Qu ti, qu p, gimtn
Nguyn nhn:
Do cch in gi ci Thao tc sai, nhm ln
1.2 S c v trng thi khng bnh thng
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1.3.1 Tnh chn lc1.3.2 Tc ng nhanh1.3.3 nhy1.3.4 tin cy1.3.5 Kinh
t
1.3 Cc yu cu chnh
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Tnh chn lc: Khi phn t no b s c hay h hng th bov rle ch cn loi b
phn t .
1.3.1: Tnh chn lc
V d:
CB1 CB2~
A B C
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TripNo trip
Tc ng nhanh: m bo tnh n nh ca cc my pht lm vicsong song trong
HT. Gim tc hi ca dng ngn mch n cc thitb, gim xc sut gay h hng nng
hn, nng cao hiu qu t ng li.
Thi gian ct = T relay + T CB
V d:ng dy 300 500 Kv: 0.1 0.12 sng dy 110 220 Kv: 0.15 0.3 s
ng dy 6 10 Kv : 1.5 3 s
Cng xa ngun cng t nh hng n tnh n nh ca HT
1.3.2: Tc ng nhanh
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nhy:
c trng nhy: Knh khong 1.5 2.0
Theo dng in ngn mch:
Theo in p ngn mch:
minNMnh
kd
IK I
max
kdnh
N
UK U
1.3.3: nhy
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tin cy:
Khi c s c trong vng BV th BV phi tc ng chcchn. Nhng n khng tc ng
i vi cc s c m nkhng c giao.
bo v tin cy cao cn phi dng cc s n gin,gim s lng rle v cc tip xc,
cu to n gin, ch lp rp bo m cht lng ng thi kim tra, botr thng
xuyn.
1.3.4: tin cy
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Kinh t:
Phi la chn ph hp yu cu lun m bo gi thnh phi chng.
1.3.5: Kinh t
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K hiu Tn gi K hiu Tn gi
21 BV khong cch 47 BV th t pha
21N BV khong cch chng chm t 48 BV mt gia tc
24 BV qu t 49 R-S BV nhit Rto Stato
25 BV ng b 50/50N BV qu dng in ct nhanh
26 BV du 51BF BV h hng my ct
27 BV thp p 51G BV qu dng chng chm t
30 BV ch th vng bo v 51GS BV qu dng chng chm t S
32F BV nh hng cs th t thun 51/51N BV QDCC thi gian tr
32R BV nh hng cs th t nghch 51V BV QD c kim tra in p
33 BV ch th mc du thp 52 My AC
37 BV dng in thp v cs thp 59 BV in p
40 BV pht hin mt kch thch MF 59N BV in p th t khng
46 BV dng in th t nghch 60 BV cn bng dng v in p
1.4 M r le / k hiu
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K hiu Tn gi K hiu Tn gi
62 Rle thi gian 86 Rle ct v kha my ct
63 Rle p sut 87 Bo v so lch
64 Rle chng chm t 87G Bo v so lch my pht
64R Rle chng chm t Rto 87T Bo v so lch my bin p
67 Rle dng nh hng 87B Bo v so lch thanh ci
67N Rle dng nh hng chng c 87N Bo v so lch chng chm t
74 Rle xa gim sat mch ct 90 Rle iu ha in th
76 Rle qu dng in DC 92 Rle nh hng cs v in p
78 R le MB hay o gc lch pha 95 Rle pht hin t mch th cp BI
79 T ng li 96 Rle hi
80 Rle pht hin mt ngun DC
81 Rle tn s
85 Bo v tn s cao, pilot
1.4: M rle / k hiu
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Bo v ng dy
1.5 S bo v mu
i vi ng dy t 220KV gm c cc bo v chnh : 87L,21, bo v d phng: 21,
67/ 67N, 50/ 51, 50/51N.
i vi ng dy t 66KV -110KV gm c cc bo v chnh :21, bo v d phng: 67/
67N, 50/ 51, 50/51N.
i vi ng dy 15KV-23KV khng c ngun diesel: ch cnbo v 50/51,
50/51N.
i vi ng dy 15KV-23KV c ngun diesel cn c r lequ dng c hng
67/67N.
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Bo v thanh ci
1.5 S bo v mu
Bo v chnh: 87Bus,
Bo v d phng: 50/51, 50/51N
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Bo v my bin p:
1.5 S bo v mu
Bo v chnh : R le 87T
R le 96 (R le hi): R le ny t ng ni gia thng du chnh vthng du ph.
Khi c s c bn trong my bin th, mt lng hi sinhra i qua r le ny. Ty
theo mc s c nng hay nh m r le i botn hiu hay a tn hiu i ct my ct.
Nhng s c nghim trng s gyra mt xung du v pha bnh du ph lm r le tc ng
ct my ct ngaytc th.
Ngoi cc r le trn cn c cc r le mc du thp, r le nhit du , rle nhit
cun dy, r le p lc (r le ny o tc thay i p lctrong du).
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Bo v my bin p:
1.5 S bo v mu
Bo v d phng:
R le qu dng chm pha, chm t pha cao (51P, 51NP) v h (51S, 51NS)
ca my bin th
R le qu dng th t khng ly tn hiu t bin dng in trung tnh pha cao
my bin th (51 GNP ) hay trung tnh pha h my bin th (51GNS).
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ABB: BV khong cch REL 511, REL 521, REL 670; BV solch RET 521,
SPAD 346, RED 5213C; BV qu dng SPAJ140C, SPAA 341C, SPAS 348C, REF
54, REF 610, REX521Siemens: BV khong cch 7SA511, 7SA513, 7SA522;
BVso lch 7UT512, 7UT513, 7UT612, 7UT613, 7SS522,7SS523; BV qu dng
7SJ511, 7SJ611, 7SJ622, 7SJ 64,7SJ635, 7SJ600ALSTOM: BV khong cch
EPAC 3000, EPAC 3522,MICOM P441, P442, P443, P437, LFZP 111; BV so
lchKBCH 120, 130, 140, P632, P633, P634, LFCB 122,P543,DIB CL; BV
qu dng P120, P122, P123, P127,P141, KCGG 140, KCEG 142
1.6 Nh sn xut
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BV rle v t ng ha GV: NG TUN KHANH 8
SEL: BV khong cch SEL 311L, SEL 421, SEL 321, SEL311C ; BV so
lch SEL 387, SEL387E, SEL487; BV qudng SEL551, SEL351,SEL451
TOSHIBA: BV khong cch GRZ; BV so lch GRT, D2L7E,D2B; BV qu dng
TCO 29S, GRD140
1.6 Nh sn xut
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