6/6/2014 Ging vin: TS. Nguyn Xun Tng
B mn H thng in
i hc Bch khoa H Ni
Email: [email protected]
BO V V IU KHIN H THNG IN
CC THUT TON IU KHIN& BO V TRONG RLE K THUT S
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Chng 01: BU & BI dng cho mc ch bo v rle
Chng 02: Cu trc rle k thut s
Chng 03: Bo v qu dng in dng rle k thut s
Chng 04: Bo v so lch dng rle k thut s
Chng 05: Bo v khong cch dng rle k thut s
Chng 06: Cc chc nng ph bin khc ca rle k thut s
Chng 07: nh v s c trn ng dy truyn ti in
2
cng
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
3
Qui nh v nh s chc nng bo v
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
4
Qui nh v nh s chc nng bo v
Chng 01
5
My bin p o lng(dng cho h thng rle bo v )
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Tn gi chung: BI, CT, TI
Nhim v:
Bin i t l dng in s cp th cp (5A hoc 1 A)
Cch ly mch s cp v th cp
To s phi hp dng in gia cc pha
6
My bin dng in
BI cao p
S nguyn l
Is cp*ws cp = Ith cp*wth cpNguyn l hot ng
CT: Current Transformer (ting Anh)
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
S thay th
Sai s ca BI xut hin do tn ti ca dng t ha
in p xut hin pha th cp
Vth cp=Ith cp*(Zcun th cp+Zdy dn ph + Zthit b ni vo)
Ti tng Vth cp tng tng dng t ho Ie tng sai s ca BI
7
My bin dng in
Vth cp
Zcun th cp
BI l tng S thay th n gin ca BI
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
c tnh t ha ca BI
Quan h gia dng in t ha cn thit (Ie) sinh ra mt in p h mch V
im gp VK:
L mt im trn ng cong t ha
T : tng in p ln thm 10% cn tng dng t ha 50%
8
My bin dng in
in p im gp VK(Knee-point)
Vng lm vic tuyn tnh
Vng bo ha
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Khai bo cc tnh ca my bin dng (rle s)
9
My bin dng in
im u sao v pha ng dy im u sao v pha thanh gp
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Hin tng h mch th cp BI
Gy qu in p nguy him
10
My bin dng in
BI l tng
H mch
o H mch th cp: ton b dng s cp lm nhim v t ha li to Li t b bo hao T thng tn ra ngoi li thp
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Hin tng h mch BI
Dng sng in p u ra ca BI khi h mch
11
My bin dng in
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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S thay th khi BI b bo ha
Dng khi tnh ton bo v so lch tng tr cao
Khi BI b bo ha:
Dng u vo tng cao
Dng u ra c dng xung nhn gi tr hiu dng rt nh
Nh vy: c th coi l c dng u vo BI nhng khng c dng ura dng u vo khp mch qua nhnh t ha tng ngvi vic tng tr nhnh t ha gim rt thp, coi nh xp x bng 0
12
My bin dng in
BI l tng
X=0
Zs cp Zth cp
S thay th khi BI b bo ha
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
So snh BI dng cho o lng bo v rle
13
Thng s ca my bin dng in
Hng mc so snh BI dng cho o lng BI dng cho bo v rle
Phm vi hot ng chnh xc
(0,051,2)x Inh mc (o dng ti bnh thng hoc qu ti cho php)
ti (10-20-30)x Inh mc (m bo o c dng s c)
Li t Bo ha nhanh bo v cc dng c o khi s c, dng intng cao
in p bo ha cao hn (VK)(kh b bo ha)
chnh xc chnh xc cao 0.2 hoc 0.5 vi chun IEC 0.15 hoc 0.3 hoc 0.6 vi
chun IEEE
chnh cc thp hn 5P hoc 10P theo chun IEC
Thit b ni ti kW, KVar, A, kWh, kVArh
Rle, b ghi s c
La chn cp 5P hay 10P ty thuc loi bo v
Bo v so lch 5P
Bo v qu dng in 10P
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
BI cho bo v rle
Cng sut nh mc
Cp chnh xc
C thm thng s ALF: h s gii hn dng in theo chnh xc
14
V d thng s ca my bin dng in
5P20 30VA
Cp chnh xc 5P
P: dng cho mc ch bo v rle
(Protection) H s gii hn dng: 20Ti 20 ln dng nh mc, BI vn m bo sai s theo tiu chun
Cng sut nh mc 30VA
BI cho o lng
Cng sut nh mc
Cp chnh xc
30VA Cp chnh xc 0,5
Cp chnh xc 0,5
Cng sut nh mc 30VA
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Dng cho mc ch c bit
Bo v so lch thanh gp C rt nhiu BI
Cc BI phi c cng c tnh lm vic gim dng khng cn bng
Bin dng cp X: thng s c cho chi tit hn
Dng nh mc
T s bin
in p im gp VKDng in kch t ng vi in p im gp
in tr ln nht cho php pha mch nh th
15
My bin dng in cp X (hay PX theo IEC)
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Thc t, mi BI c th c:
1 hoc 2 cun th cp - Mc ch o lng
2 ti 4 cun th cp - ng dng bo v rle.
16
Cc thit k ca my bin dng in
Cun s cp
Cc cun th cp
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
BI loi thng cha bn di (Dead tank)
Trng tm thp, n nh v mt c kh
C th ch to vi li t loi to m khnggy qu ti v mt c kh i vi s cchin
Dy s cp c chiu di ln nn gy phtnng nhiu hn hn ch v dng nnh nhit (ln nht 63kA/1 giy)
17
Cc thit k ca my bin dng in
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
BI loi thng cha bn trn (Live tank)
Dy dn s cp ngn, gim pht nhit
C dng nh mc v dng n nh nhitcao hn
Trng tm cao hn, km n nh v mt ckh so vi loi thng cha di (dead tank)
Khi ch to vi li t ln c th gy titrng ln v mt c kh i vi s cchin.
Kh lm mt cc cun th cp
18
Cc thit k ca my bin dng in
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Nguyn l:
Dng 3 BI ring bit
Do s dng 3 BI ring bit nn s c sai s gia cc BI
ch bnh thng, pha s cp l i xng: lun c dng in chy quarle do sai s ca BI
Ch s dng o dng chm t ln dng mng in c dng chm t ln:mng in trung tnh ni t trc tip
19
o dng inth t khng (I0)
Ia
Ib
Ic
RoleIa Ib Ic 3I0+ + =
Role
3I0
V rt gn
Ia+Ib+Ic=3I0
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Dng BI th t khng (Flux Summation CT hoc Core Balance CT) Bin dng c mt li t hnh xuyn
Cun dy c phn b u trn li
Dy dn s cp chy xuyn qua li t (ng knh trong 1025 cm)
20
u sai u ng
o dng inth t khng (I0)
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
BI th t khng
u ng: dy ni t v cp chy xuyn qua li t
21
My bin dng in
Rle
V kim loi ca cp
BI0
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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BI th t khng
Ngc li - u sai: dy ni t v cp khng chy xuyn qua li t
Dng in chy qua v cp c th trit tiu dng in s c (honton hoc mt phn): rle c th khng nhn c thng tin s c.
22
My bin dng in
Rle
V kim loi ca cp
BI0
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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u ni BI lc thnh phn TTK
ng dng ca BI th t khng Do ch s dng mt li t sai s o lng rt nh
S dng cho cc mng in c dng chm t nh (mng in c trung tnh cch in hoc ni t qua cun dp h quang)
Do c 3 pha chy qua li t ng knh li t ln kch thc BI ln thch hp trang b vi ng cp hoc u cc my pht in
23
My bin dng in
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Nhim v
Bin i t l in p s cp sang in p th cp theo tiu chun(100V hoc 110V)
Cch ly mch s cp v cc thit b, ngi vn hnh bn th cp
Qui c cc tnh
Cc tnh cng tn c nh du : hnh sao, chm trn, chmvung...
Trn bn v: cc tnh cng tn v cnh nhau.
24
My bin in p
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
in p danh nh s cp v th cp
BU ngoi tri thng s dng in p pha: in p danh nh ca cun s cp l in p danh nh ca li in.
ng dng o lng: phm vi in p lm vic: 80120%
ng dng bo v rle: t 0.05 1.5 hoc 1.9 ln in p danh nh.
25
My bin in p (BU)
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
BU kiu t phn p
BU loi cm ng in t thng thng
La chn kinh t nht i vi cp in p ti 145kV
BU kiu t phn p (CVT Coupled Voltage Transformer)
La chn khi dng cp cao p
Thng c s dng kt hp vi h thng thng tin ti ba PLC
26
My bin in p (BU)
u cao p
in khng b
T phn
p Mch dp dao ng cng hng
BU cm ng thng thng
u ra
K{ hiu trn s
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Cu trc BU kiu t phn p
1. Bnh gin du
2. Cc t phn p
5. in khng b
7. BU loi cm ng thng thng
(in p thp)
8. u cc cao p
27
My bin in p (BU)
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
BU kiu t phn p
in khng b: c tnh ton trit tiu thnh phn dungkhng ca t phn p
Tng tr ngun nhn t pha ti l xp x 0 cng sut u ra ly raln nht
B dch pha do t phn p gy ra
Mch gim dao ng cng hng: l in tr ti, c th ni cuntam gic h
28
My bin in p (BU) Tham kho
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Cc loi BU
H s gii hn in p Vf
Khi xy ra s c trong HT: Upha c th tng ln ti mt gi tr l Vf lnUdanh nh.
Tiu chun IEC a ra cc gi tr h s Vf nh sau: 1.9 i vi cc h thng c trung tnh khng ni t trc tip
1.5 i vi cc h thng c trung tnh ni t trc tip
Li t ca cc bin in p khng c php bo ho khi in p tngti cp in p gii hn theo h s Vf.
29
My bin in p (BU)
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Cp chnh xc theo tiu chun IEC 60044-2
Cng sut danh nh (cos=0,8)
10, 15, 25, 30, 50, 75, 100, 150, 200, 300, 400, 500 VA
30
My bin in p (BU)
Cp chnh
xc
Sai s gii hn
Ti % in p nh mc
Sai s ln %
Sai s gc pha(pht)
ng dng
Chun ha dng c o trong cng nghip
ng h o
Ti % ti nh mc
Phng th nghim
o m chnh xc
Bo v rle
Vf: H s gii hn in p
Bo v rle
o m tiu chun
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
S cp
Th cp
B lc in p TTK (U0)
Dng 3 BU loi mt pha
31
My bin in p (BU)
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
B lc in p TTK (U0)
Dng BU loi 3 pha 5 tr in p TTK ly ra t cun tam gic h
32
My bin in p (BU)
S cp
Thccp
3V0
A
B
C
A B C N
o c in p th t khng:o Phi c ng dn cho t thng TTKo Cn thm 2 tr (khng qun dy)o Trung tnh cun s cp phi ni t (nu khng s ch o c thnh phn hi bc 3)
Chng 02
33
Cu trc rle k thut s
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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a chc nng, cng sut tiu th nh
Tit kim chi ph
Gim thao tc u ni
Cho php lp trnh logic lin ng, tip im u ra, hin th
Lp trnh c tnh tc ng, nhiu b gi tr ci t
iu khin ti ch, gim st kt ni t xa
Kh nng t gim st
Thu thp d liu
Bn ghi s c
Bn ghi s kin
Thng s vn hnh
34
u im
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Kh nng gim st kt ni
35
u im
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Cu trc chung
36
Cu trc
Xem din gii chi tit ti liu gi km
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
V d vi rle SIEMENS
37
Cu trc
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
V d
38
Cu trcD
IGIT
AL I/O
Sta
tus Inputs
/ C
ontr
ol O
utp
uts
Digital I/O Analog I/O
AN
AL
OG
I/O
Analo
g T
ransducer
I/O
Communications
CO
MM
UN
ICA
TIO
NS
(Pro
tection)
CT Shorting
Clips
Field Wiring
Undisturbed
Module
Keying
D dng nng cp (plug & play)
Plug n Play
Easy Module
Draw-out
Chng 03
39
Bo v qu dng
Bo v qu dng c thi gian (51)
Bo v qu dng in ct nhanh (50)
Bo v qu dng kt hp kha v hm in p thp (51V)
Bo v qu dng c hng
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Bo v qu dng (I> hoc 50 & 51):
Chng li cc dng s c qu dng mt pha, hai pha & ba pha v s cchm t.
Bo v khi ng khi:
Dng in ca mt pha, hai pha hoc c ba pha vt qu mt gi tr c ci t trc trong rle.
C th lm vic vi thi gian tr m bo tnh chn lc
Thi gian tr:
c lp so vi dng in (c tnh c lp)
Ph thuc vo dng in (c tnh ph thuc)
40
Bo v qu dng c thi gian
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Bo v qu dng vi c tnh thi gian c lp:
Thi gian lm vic (tr) ca bo v khng ph thuc vo ln dngngn mch
41
Bo v qu dng c thi gian
+
Iqua rle
Thi gian lm vic
Ikhi ng
tlm vic khng i theo dng in
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Bo v qu dng vi c tnh thi gian ph thuc:
Thi gian lm vic: ph thuc t l nghch vo ln ca dng in ngn mch
Trong thc t th thi gian tc ng t l vi t s Ingn mch/ Ikhi ng
42
Bo v qu dng c thi gian
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Bo v qu dng vi c tnh thi gian ph thuc
43
V d
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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c tnh ca rle s
C cc c tnh chun ha
Cho php t thit lp c tnh (custom)
44
Bo v qu dng c thi gian
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Phm vi s dng ca cc c tnh
Standard Inverse (SI): s dng trong hu ht cc trng hp cn phigia cc bo v
Very Inverse (VI): c tnh rt dc thch hp s dng khi ln dngin s c dc ng dy cn bo v thay i mnh.
Extremely Inverse (EI): thi gian tc ng t l nghch vi bnh phngca dng in.
ng dy mang cc ti c dng khi ng t bin thi im uv d nh t lnh, my bm, ng c ln...
Phi hp vi cc cu ch hoc cc thit b t ng li.
45
La chn c tnh lm vic
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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S logic ca bo v qu dng c thi gian
46
Bo v qu dng c thi gian
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Nguyn tc: m bo tnh chn lc bng phn cp dng in
S c ti phn on no: ch bo v ti c php khi ng
Cc bo v khng cn phi hp thi gian
Thi gian tc ng t xp x 0 giy (thng t 5080ms) tn gi:bo v qu dng ct nhanh (50 hay I>>)
Do cch chn lc bng dng in dng in khi ng tnh theo:
Ik=Kat*Ingn mch ngoi vng max (H s Kat=1,11,2)
Khng bo v c ton b i tng khng s dng lm bo vchnh
47
Bo v qu dng ct nhanh (50 hay I>>)
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Vng c bo v ct nhanh
Ik=Kat*Ingn mch ngoi vng max (H s Kat=1,11,2)
Dng ngn mch gim dn khi im ngn mch i xa ngun
ln dng ngn mch ph thuc vo ch ca h thng
V ng cong biu din dng ngn mch Inmax & Inmin dc ng dy
48
Bo v qu dng ct nhanh (50 hay I>>)
L(km)
I> I>1 2
IN
Inmax
Inmax
Ik BV1
Ik BV2
Lct nhanh min
Lct nhanh max
Lct nhanh min=0
Lct nhanh max
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Department of Electric Power System Hanoi University of Science and Technology
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S logic
49
Bo v qu dng ct nhanh (50 hay I>>)
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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c im
Chc nng bo v qu dng ct nhanh I>> S dng gi tr hiu dng (RMS) ca dng in
Chc nng bo v qu dng ct nhanh tc cao I>>> (bo v qu dng cp 3 - high speed stage)
Mt s rle trang b thm chc nng ny
S dng gi tr dng in tc thi gim thi gian lm vic ca bo v.
50
Bo v qu dng ct nhanh (50 hay I>>)
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Tn gi khc 51V
L do s dng
S dng thm khu phn bit gia s c v qu ti bng in p(kha in p thp)
Khi s c: in p gim thp hn
Khi qu ti (nng): in p vn nm trong ngng cho php
51
Bo v qu dng c kha in p thp (51&27)
ng dy di
Mang ti nng
Dng ngn mch cui
ng dy nh
Dng khi ng
ca bo v ln
Bo v khng
nhy
Kat* Kmm*Ilv maxKtv
Ik=
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
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Department of Electric Power System Hanoi University of Science and Technology
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Phn bit hai loi bo v
Bo v qu dng kt hp vi kha in p thp
51 & 27= Voltage Controlled Overcurrent
Bo v qu dng kt hp hm in p (51V)
Voltage-Restraint Overcurrent
T ng iu chnh gi tr dng khi ng theo in p
Khi in p gim dng khi ng c t ng gim i
52
Bo v qu dng c kha in p thp (51&27)
Chc nng ny s kha khi mt in p nh th
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
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Department of Electric Power System Hanoi University of Science and Technology
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Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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L do s dng
Cc phn t ca bo v qu dng c hng
S u ni phn t nh hng cng sut
La chn gc c tnh ca phn t nh hng
53
Bo v qu dng c hng (67)
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Department of Electric Power System Hanoi University of Science and Technology
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Xt li in cp ngun t hai pha
S c xy ra ti N1: c th BV3 & BV2 khi ng m bo chn lc: yu cu BV3 tc ng trc BV2 phi t tBV3 5I>4 I>6I> 3I>2HT1 HT2
N1
I> 1 I> 5I>4 I>6I> 3I>2HT1 HT2
N2
tBV3tBV2
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Department of Electric Power System Hanoi University of Science and Technology
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55
Bo v qu dng c hng (67) - S cn thit
I> = I> + W
I>
+
-
Gii php: s dng bo v qu dng loi c nh hng
Bo v qa dng c hng ch tc ng khi:
Dng in chy qua bo v theo hng qui nh (hng dng -thng qui c t thanh gp ng dy)
Dng in vt qua gi tr khi ng ca bo v
Vy: bo v qu dng c hng l
Bo v qu dng + B nh hng cng sut
B nh hng cng sut:
Thnh phn tham chiu
Thnh phn cn xc nh hng
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
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Department of Electric Power System Hanoi University of Science and Technology
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Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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S u ni b nh hng cng sut:
c u ni m bo Rle c nhy v tc ng ng trong mi
trng hp.
S u ni tiu chun i vi rle s S 900
i lng lm gc tham chiu: in p
Chi tit phng thc u ni: Dng in t mt pha
in p dy ca hai pha cn li
56
Bo v qu dng c hng (67)
Gi thit cos=1 hay =00 in p tham chiu v dng in to vi nhau gc 900 tn gi ca s
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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L do chn in p l i lng tham chiu:
Khi xy ra s c ba pha: in p gim thp, nu s dng in p phath rle nh hng c th khng nhy, s dng in p dys tng c gi tr in p a vo rle.
Khi xy ra s c pha-pha v d gia pha 1 & 2: in p U12 c th rtthp (c th bng 0 nu s c gn bo v) rle nh hng khng nhy, trong khi in p U23 vn cn ln phi s dngin p dy vi pha khng s c cn li lm in p tham chiu.
57
Bo v qu dng c hng (67)
Chng 04
58
Bo v so lch dng in
Bo v so lch dng in c hm
La chn h s hm
Ni t BI
Bo v chng chm t hn ch (87N)
Bo v so lch tng tr cao (87H)
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Thit b
So snh tng dng in i vo & i ra ca i tng c bo v: tng dng in ny khc 0 bo v tc ng.
Ch bnh thng:
Dng in chy qua rle nh hnh v
Dng chy qua rle: l dng chnh lch do sai s ca BI cc pha
59
Nguyn l
Bnh thng
Irle= +
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Ch s c ngoi vng:
Dng in l dng s c c gi tr ln sai s BI ln hn
Phn b dng in tng t ch bnh thng
Dng in chy qua rle s ln chnh nh rle khng tc ng dng khi ng ln, gim nhy
Vng bo v: gii hn bi v tr t cc BI
60
Nguyn l
S c ngoi
Thit b
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Ch s c trong vng:
Dng in chy qua rle bng tng dng hai pha c gi tr ln rle s tc ng ngay
61
Nguyn l
S c trong vng
Thit b
Irle= +
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Tng kt:
62
Nguyn l
Irle= +
S c trong
Thit b
Irle= +
S c ngoi
Irle= +
Bnh thng
Dng in chy qua rle l do sai s BI Dng in chy qua rle l tng dng s c
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Department of Electric Power System Hanoi University of Science and Technology
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Bo v rle so lch thng thng cc rle c th tc ng nhm do:
Sai s ln ca cc BI khi ngn mch ngoi
Chuyn u p...
Bo v so lch c hm: hot ng da theo t hp ca hai loi dng in so lch (Isl) & hm (Ih):
S c ngoi vng: dng hm c gi tr ln dng so lch nh
S c trong vng: dng hm nh - Dng so lch ln.
63
Bo v so lch c hm
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Department of Electric Power System Hanoi University of Science and Technology
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iu kin tc ng ca rle so lch c hm
Vi cc rle in c:
Rle c Lc hm lun khng i
Tnh ty bin km
Vi cc rle s Thc hin thut ton tng t
Mc hm thay i ty theo trng thi ca thit b
Linh ng vi cc trng thi vn hnh ca thit b
64
Bo v so lch c hm
Lc tc ng(do dng so lch gy ra) Lc hm(do dng hm gy ra)+ Lc hm l xo
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Department of Electric Power System Hanoi University of Science and Technology
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Phn tch c tnh tc ng ca rle so lch c hm
Vi cc rle c
65
Bo v so lch c hm
Lc tc ng(do dng so lch gy ra) Lc hm(do dng hm gy ra)+ Lc hm l xo
Iso lch Khm*Ihm+ Ihm c nh (hng s)
y a*x+ b
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Rle c: h s hm l c nh
Rle s: h s hm t ng thay i theo ch vn hnh
66
Bo v so lch c hm
c tnh lm vic ca rle bo v so lch- Loi in c -
c tnh lm vic ca rle bo v so lch- Loi s dng k thut s -
y a*x+ b
a b
c
d
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Department of Electric Power System Hanoi University of Science and Technology
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T hp dng in hm v so lch trong cc rle k thut s
Dng in so lch: iso lch = i1(vo)-i2(ra)-i3(ra)
Dng in hm: Cch thc t hp thay i ty theo hng sn xut
67
Bo v so lch c hm
Trung bnh cng
TngnR iiiii ...321
nR iiiin
i ...1
321
Siemens
Areva
I1(vo) I2(ra)
I3(ra)
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Department of Electric Power System Hanoi University of Science and Technology
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L do h s hm nn t thay i theo ch vn hnh
68
Bo v so lch c hm Rle s
Tng dng sai lch
Dng sai lch do BI
Dng sai lch do chuyn i u phn
p, khng ph hp t s BI
Dng t ha my bin p
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Department of Electric Power System Hanoi University of Science and Technology
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Ni t BI
69
Vn ni t BI vi bo v so lch
Bo v so lch MF
Bo v so lch MBA
BI trunggian
BI trung gianRle c
Rle s
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Department of Electric Power System Hanoi University of Science and Technology
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Ni t BI
70
Vn ni t BI vi bo v so lch
Bo v so lch tng tr cao
Rle
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Ni t BI
71
Vn ni t BI vi bo v so lch
Bo v so lch tng tr cao
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
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Department of Electric Power System Hanoi University of Science and Technology
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Department of Electric Power System Hanoi University of Science and Technology
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Bo v so lch c th tc ng nhm khi BI b bo ha
V d hin tng bo ha ca cc BI vi bo v thanh gp
72
Nguyn l{ bo v so lch tng tr cao (87H)
Vng bo v
S c trong vng bo v
Vng bo v
S c ngoi vng bo v
Bo ha
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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L do s dng 87H
Vi cc rle so lch tng tr thp: trng hp rle b bo ha honton th d rle c c trang b hm nhng vn c kh nng tcng nhm
Nguyn l lm vic ca bo v so lch tng tr cao m bo lmvic tin cy trong trng hp xu nht: BI b bo ha hon ton.
Vi BV thanh gp th hin tng bo ha BI cng d xy ra do: Ti ca cc BI khng ging nhau mt BI c dng s c tng chy qua v dng
s c ny s phn chia qua cc BI cn li.
Vi bo v REF hin tng xy ra tng t:
BI trung tnh v BI pha mang dng khc nhau trong ch s c mc bo ha khc nhau. D gp hin tng bo ha my bin dng
73
Nguyn l{ bo v so lch tng tr cao (87H)
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Department of Electric Power System Hanoi University of Science and Technology
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S thay th khi BI b bo ha
Dng khi tnh ton bo v so lch tng tr cao
Khi BI b bo ha:
Dng u vo tng cao
Dng u ra c dng xung nhn gi tr hiu dng rt nh
Nh vy: c th coi l c dng u vo BI nhng khng c dng ura dng u vo khp mch qua nhnh t ha tng ngvi vic tng tr nhnh t ha gim rt thp, coi nh xp x bng 0
74
Nguyn l{ bo v so lch tng tr cao (87H)
BI l tng
X=0
Zs cp Zth cp
S thay th khi BI b bo ha
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Department of Electric Power System Hanoi University of Science and Technology
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Xt s n gin: thanh gp ch gm hai ngn l
75
Nguyn l{ bo v so lch tng tr cao (87H)
IBI1 BI2
Bo ha
IBI1L tng
Zs cp Zth cp
X>>0 X=0
Zs cpZth cp
BI2L tng
Gi tr rt ln(coi l h mch)
Gi tr xp x 0(ni tt)
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Department of Electric Power System Hanoi University of Science and Technology
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Xt s n gin: thanh gp ch gm hai ngn l
76
Nguyn l{ bo v so lch tng tr cao (87H)
IBI1L tng
Zs cp Zth cp Zs cpZth cp
BI2L tng
Nhnh song song
BI b bo ha: khng c dng th cp
BI cn li: dng cp ra khp mch qua rle v tng tr th cp BI b boha c dng qua rle rle s tc ng (tc ng sai)
Gii php: hn ch dng qua rle bng cch ghp ni tip mt in trc gi tr ln rle so lch tng tr cao
I
Zth cp Zth cp
R>>
Rle so lch tng tr cao
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Cc yu t cn ch
Hiu chnh gc pha do t u dy my bin p
Loi b thnh phn dng in TTK
Hiu chnh t s bin dng
Hm theo sng hi Khi ng xung kch my bin p
Khi qu t thng li t
77
Bo v so lch cho my bin p (87T)
I
I1 I2
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
nh hng ca t u dy my bin p
MBA t u dy hai pha khc nhau dng in cc pha b lchgc nhau
T u dy Y0/-11 th dng s cp v th cp lch nhau 11x300=3300.
Nguyn l bo v so lch yu cu dng in hai pha cn so snhphi trng pha khi xy ra lch pha c dng cn bng chyqua bo v s tc ng nhm phi hiu chnh gc pha.
Rle s: hiu chnh gc pha c thc hin bng phn mm:
BI c th u hnh Y cho mi cun dy
Khai bo vo rle cc t du dy ca my bin p v my bin dng(nu cn thit).
78
Bo v so lch cho my bin p (87T)
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
V d xc nh vecto dng in theo t u dy (Y/-11)
79
V d
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Loi b thnh phn dng in TTK
S c chm t ngoi vng
Nu khng loi b: tc ng nhm
80
Bo v so lch cho my bin p (87T)
Dng qua rle ln hn 0Rle c th tc ng nhm
BI trung gian khng c cun tam gic
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Loi b thnh phn dng in TTK trong rle s
S dng nguyn l Ipha so lch = Ipha o I0
V d thut ton trong rle s
81
Bo v so lch cho my bin p (87T)
Dngpha oc
Dng so lch loi tr I0
Gii thch
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Hiu chnh t s bin dng
Dng cn bng c th sinh ra khi:
BI cc pha c t s bin khc t s bin p
Hoc khi dng in th cp ca cc BI khng ging nhau
Rle s t ng tnh ton h s hiu chnh
82
Bo v so lch cho my bin p (87T)
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Hm theo thnh phn sng hi
Chng hot ng nhm do dng t ha xung kch khi ng khng ti
ng my bin p khng ti
Khng c ti
ng in my bin p t mt pha
Khi ng khng ti:
Dng t ha xung kch chy vo t mt pha
Pha u ra khng ti: khng c dng in
Bo v so lch c th tc ng nhm
83
Bo v so lch cho my bin p (87T)
I1
I
I2
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Hm theo thnh phn sng hi
Cch x l dng t ha xung kch khi ng khng ti vi rle s
Dng t ha xung kch c dng mo sng, tt nhanh
Phn tch ph: c sng hi bc 2 ly lm tn hiu hm bo vso lch hm theo sng hi
84
Bo v so lch cho my bin p (87T)
Dng xung kch
in p
Phn tch ph
Bc c bn (50Hz)
Bc hai (100Hz)
Bc cao hn
Sng hi
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Hm theo thnh phn sng hi
L do chn thnh phn sng hi bc 2 hm bo v khi ng xungkch
ng my bin p khng ti (ng xung kch) Dng t ha xung kch: lun cha thnh phn 2nd
Dng s c: khng c 2nd & bc chn
Dng t ha xc lp: khng c sng hi bc chn.
Sng hi bc 2: c trng ring bit ca dng t ha xung kch sdng thnh phn sng hi bc 2 ny t ng hm bo v so lch khing khng ti my bin p.
85
Bo v so lch cho my bin p (87T)
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Hm theo thnh phn sng hi
Chng hot ng nhm khi MBA b qu t thng
Li my bin p b qu t thng
Dng in cc pha khng ging nhau
Khi MBA b qu t thng: dng in c cha thnh phn snghi bc 3th & 5th
Thnh phn bc 3: c th b loi bi cun tam gic dng thnh phn hi bc 5 kha tm thi chc nng bo v so lch
86
Bo v so lch cho my bin p (87T)
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Vng hm b sung
pht hin tnh trng bo
ha my bin dng khi xy ra
ngn mch ngoi.
Hot ng
S c trong vng: Hin tng bo ha my bin
dng do s c trong vng bo v khng gy nh hng nhiu ti s lm vicca bo v 87T v mc bo ha ca BI cc pha l gn tng t nhau.
S c ngoi vng Cc BI c mc bo ha khc nhau: bo v c th tc ng nhm do dng so
lch rt ln
87
Bo v so lch cho my bin p (87T)
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Vng hm b sung Chi tit
Khi bin dng b bo ha dng in u ra ch tn ti trong mt phn nh ca chu kz (c dng xung)
88
Bo v so lch cho my bin p (87T)
S c trong vng S c ngoi vng
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Qu o ca im lm vic khi BI c/khng b bo ha
89
Bo v so lch cho my bin p (87T)
Khi BI bo ha
Khi BI l tng
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Qu o ca im lm vic khi BI c/khng b bo ha
90
Bo v so lch cho my bin p (87T)
Khi BI bo ha
Khi BI l tng
S c ngoi & BI bo ha:
Thi im u: dng hm tng mnh
ng thi khi : cc BI cha bo ha dng so lch nh qi o ca im lm vic i theo on 0-1-2
Sau BI bt u b bo ha dng so lch tng dn
Dng hm gim mt cht: im lm vic di chuyn theo qu o 2-3 c th ri vo vng lm vic rle tc ng nhm.
S c trong vng:
im lm vic ngay lp tc ri vo trong vng tc ng
Rle c thm vng hm b sung: s pht hin hin tng bo ha BI khi thy im lm vic ri vo vng hm ny. Khi chc nng so lch s b tm thi kha li trnh tc ng nhm.
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
L do dng bo v so lch th t khng 87N
S c ti im gn trung tnh cun dy u hnh sao, trung tnh ni t: dngs c c th rt b (do in p gn trung tnh c gi tr nh)
Bo v qu dng TTK (50N & 51N):
C th khng nhy bo v cho cun dy my bin p
Bo v so lch:
C th khng nhy dng bo v so lch th t khng (87N)
Phm vi bo v: cc cun dy u sao, trung tnh ni t (phm vi bo v b hn ch).
91
Bo v so lch th t khng (87N)
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
L do dng bo v so lch th t khng 87N
V d v nh hng n nhy ca BVSL 87T
92
Bo v so lch th t khng (87N)
Dng in pha trong cun Y0
Dng in dy ca cun
Gi thit BVSL t ngngkhi ng l 20% (0,2In):
Khong 59% cun dykhng c bo v
bo v khong 80% cun dy ngng khi ng 2,3%In khng thc t
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
L do dng bo v so lch th t khng 87N
Xt dng in chy qua trung tnh cun dy Y0 ni t trc tip
Khi s c gn trung tnh (v d cch 10%) dng qua dy trung tnh In lun ln hn rtnhiu ln dng in pha Ip bo v ly dng in In s c nhy
93
Bo v so lch th t khng (87N)
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Bo v so lch th t khng 87N
Phn b dng in khi s c trong/ngoi vng
Lun c dng qua dy trung tnh dng dng in ny nh i lng tcng
Cn c thnh phn hm:
Khi s c ngoi cc BI c th b bo ha vi mc khc nhau khi s c pha-pha
94
Bo v so lch th t khng (87N)
S c ngoi vng S c trong vng
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Nguyn l thc hin chc nng 87N ca cc rle SEL
95
Bo v so lch th t khng (87N)
S c ngoivng
S c trongvng
S dng vic so snh hng ca tng dng ba pha
Dng tc ng: 3I0=Ia+Ib+Ic
So vi dng tham chiu: dng trung tnh In
Dng trun tnh c s dng v khng i hngvi c s c trong v ngoi
S c trong vng: dng tc ng v dng trung tnhcng pha
S c ngoi vng: dng tc ng v dng trung tnhngc pha 1800
a
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Nguyn l thc hin chc nng 87N ca cc rle SIEMENS
96
Bo v so lch th t khng (87N)
T hp dng hm v tc ng
Dng tc ng: Itc ng=3In
Dng hm: Ihm=k*(|3In-3I0|-|3In+3I0|)
k: h s hm
Gi thit k=1
S c ngoi vng: 3In v 3I0 bng nhau, ngcpha
Dng tc ng: Itc ng=3In
Dng hm: Ihm= (|3In-3I0|-|3In+3I0|)=2*|3In|
Rle s hm an ton
S c trong vng: dng cp ch t pha cun Y0 Ch c 3In cn 3I0=0
Dng tc ng: Itc ng=3In
Dng hm: Ihm= (|3In-3I0|-|3In+3I0|)=0
Khng c hiu ng hm rle s tc ng vi nhy cao nht
S c trong vng: dng cp c t pha hthng (gi thit cng ln)
Dng tc ng: Itc ng=3In
Dng hm:
Ihm= (|3In-3I0|-|3In+3I0|)= -2*|3In|
Dng hm m rle coi l bng khngKhng c hiu ng hm rle s tc ngvi nhy cao nht
S c ngoi, dng hm tnh ton da trn slch pha 1800 ca 3In v 3I0
Tuy nhin: BI b bo ha gc lch gim thphn 1800 lm gim ln dng hm
m bo rle khng tc ng nhm: khi gcgia dng tc ng v dng hm ln hn 1000
rle s b kha bt k dng tc ng
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Cc vn cn quan tm
T hp tn hiu cho bo v so lch
c tnh tc ng ca bo v so lch ng dy thng dng
nh hng ca in dung ng dy
tr ng truyn tin
Bo v cc ng dy r nhnh
Bo v chng tt lo
97
Bo v so lch cho ng dy (87L)
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
ng dy c chiu di ln phi dng knh truyn gi tn hiu dng in gia cc pha.
98
Bo v so lch cho ng dy (87L)
ng dy 2 ngun cp
ng dy r nhnh
Knh truyn c th kt ni theo mch vng tng tnh d phng ng nt t
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Hai loi bo v so lch dng in
99
Bo v so lch cho ng dy (87L)
ng dy cp in t mt pha
ct my ct u khng ngun cn truyn tn hiu ct t u i din
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
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Phng thc trao i dng in
T hp dng in 3 pha theo t lmt tn hiu so snh cc tnhiu ny ca hai pha.
nhy b thay i
La chn t s theo tng iu
kin c th
Ly mu dng in ca c 3 pha chuyn thnh tn hiu schuyn n so snh cng vi u i din.
Knh truyn ch yu l cp quang (PLC khng m bo bng thng)
100
Bo v so lch cho ng dy (87L)
S dng nguyn l ny:Rle 7SD502
Bin dng tng hp tch hp trong rle
Ty theo yu cu v nhy i vi s cchm t th cch t hp dng in cth khc nhau
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
S tun hon dng in
Bnh thng: dng in chy tun hon qua knh truyn tin
c im: H mch knh truyn: tc ng nhm
Ngn mch knh truyn: kha, khng tc ng nhm
101
Bo v so lch cho ng dy (87L)
S dng nguyn l ny:Rle 7SD503 (Siemens)Khong cch ti 15km
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
S cn bng in p
Bnh thng: dng in khng chy qua knh truyn tin
c im: H mch knh truyn: kha, khng tc ng nhm
Ngn mch knh truyn: tc ng nhm
102
Bo v so lch cho ng dy (87L)
S dng nguyn l ny:Rle 7SD502/7SD600 (Siemens)Khong cch ti 15km
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
c tnh tc ng
Ch bnh thng, dng in so lch c th xut hin do:
Sai khc c tnh BI cc pha ng dy
Sai s do tr trn ng truyn (knh truyn tn hiu s)
Sai s do ly mu tn hiu
Dng in so lch v hm c t hp ty theo hng ch to, tuy nhin thng da theo nguyn tc chung
103
Bo v so lch cho ng dy (87L)
L: localR: Remote
iu kintc ng
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
c tnh lm vic ca mt s rle ph bin
104
Bo v so lch cho ng dy (87L)
P546 MiCOM
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
c tnh lm vic ca mt s rle ph bin
105
c tnh tc ng
LFCB
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
X l nh hng ca in dung ng dy
in dung ng dy lm dng in hai u ng dy khc nhau
ng dy truyn ti: c th b qua in dung ng dy
Cp in lc: in dung ln phi c bin php b Tng dng khi ng (c th p dng v ng cp thng c dng ngn mch ln)
B bng thut ton: ng cp thng t/khng trang b BU kh tnh ton b trongrle
106
Bo v so lch cho ng dy (87L)
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
V d: dng in dung ng dy c th sinh ra
107
Bo v so lch cho ng dy (87L)
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
108
Bo v so lch cho ng dy (87L)
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Thut ton b in dung ng dy vi rle s
a thm: mt thnh phn m phng thnh phn dng in dung ny vo trong tnh ton dng so lch
Tr i: thnh phn ny t gi tr dng in o c
Dng in dung: tnh ton gn ng bng cch o in p ng dy v chia cho dung khng ca ng dy
109
Bo v so lch cho ng dy (87L)
Rle MiCOM
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Thut ton b in dung ng dy vi rle s
Khi ng khng ti: c dng in dung t mt pha ng dy
Nu in p i xng v ng dy c o pha: ch c dng in dung TTT ch cn tng gi tr chnh nh cho phn t so lch pha
Nu ng dy khng o pha: cn thay i gi tr chnh nh c chophn t so lch TTK v TTN
Khi s c ngoi, khng i xng:
Thnh phn dng in dung nh hng ti tt c cc phn t so lchpha, so lch TTK, so lch TTN
Tuy nhin do dng hm lc ny ln nn nh hng ny c th b qua
110
Bo v so lch cho ng dy (87L)
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
X l vn tr ng truyn tin
Bo v dng dy dn ph
Vn hnh trong thi gian thc
Tn hiu tng t o lng ti cc u ng b v mt thi gian
Bo v dng knh truyn k thut s
Ly mu tn hiu
X l v gi qua knh truyn k thut s c tr
tr v mt thi gian th hin thnh mc dch pha ca tn hiu
111
Bo v so lch cho ng dy (87L)
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
X l vn tr ng truyn tin
Bo v dng knh truyn k thut s
Gii php: o v b tr ng truyn da theo c ch ping-pong Rle mt pha gi tn hiu Rle u kia nhn c v gi tr li
Xc nh tr ng truyn da theo thi gian t lc gi n lc nhn li tn hiu
112
Bo v so lch cho ng dy (87L)
Nguyn Xun Tng - B mn H thng in HBK HN
Nguyen Xuan Tung Department of Electric Power System Hanoi University of Science and Technology
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
Copyright of Nguyen Xuan Tung
Department of Electric Power System Hanoi University of Science and Technology
Do not copy or distribute without permission of the author
X l vn tr ng truyn tin
Bo v dng knh truyn k thut s
Xc nh tr ng truyn theo nguyn tc ping-pong c chnh xc cao
Tuy nhin cn ch ti khng i xng ca knh truyn (Channel unsymmetry): Knh truyn thng c thit k vi knh d phng
Nu khng chnh nh ng: tn