电器、电线电缆及其选择-1

SF

6QF“

”（FUOItI

r1

I

r2（QSQL（QFS（————GISSF

6四、1.UN.et

UNIN.et

Ic1ock.maxI

(3

)IIoc

IL

.maxocshI

(3)Iock.maxI

(3)I2.4-110kV295A3.2kA1.1s。VS

1-12/630-16-12/630-161UN10kVUN.QF12

kV2Ic295AIN.QF630A3I

(3)k3.2kAIoc16kA4i(3)sh2.55

3.2kA=8.16kAimax40kA5I

2

t

ima(3.2kA)2

(1.1+0.1)s=12.3kA2▲sI

2tt(16

kA)

2

4s=1024

kA2▲sIN≥InIn

=

1.1～1.3

IcIn

=

1.5～2.0

I1NTIn

0.5A—QF长延时瞬时toIIr3Ir1a)II

2t

on长延时短延时I

2t

of

ftoIr2Ir1b)Ir1、Ir2、Ir3作过负荷保护作短路保护作短路保护作过负荷保护Ir4长延时短延时I

2t

of

fI

2t

on瞬时ItoIr1

Ir2c)Ir3I长延时I

2t

of

f瞬时I

2t

on短延时接地

短延时tIr1

Ir2d)Ir3o

Ir4作过负荷保护作短路保护

tI0Ir（NT

RT16

RT17RT12RT15RL

6

RL

7RT14

RT30FU————（QSQFS(ATSATS)PZ30ATS三、GCS

MNS(MCC)GCL

(K)(PC)GL

L

(K)

GGD

J

K1.(CT)TATA0.1、0.2、0.5、1、3、55P

10PN1

NI1

2

I2

Ki

I2I2N=5A或1A1P1P22

31S

2KCAS

1I1I

2ΦN1

N2S1S2BTAI

ba)2V-(I

a+I

c)I

cI

ab)varhWhWhvarhTA1S2S2TA2AS1CS1AAS1S1TA1S2S2TA2TA3ABCAS1S2c)I

aI

bI

c2.S2

≤

S2N1231.UN.et

UNI1N.etIcI2N.et5A1smaxshi

(3)it

imaI

2t

I

2

t10%10%|

Z2al|

≥|

Z2|10%误差曲线K

1Z2al10%K1

I1/I1NZ2al(PT)N1U1

U2

KuU2N2U2N=100伏TVTVVKVN2

A3a1nΦU2U1N12N0.2、0.5、1、3JDZ-10JDZJ-10TVTV321

)2

)V/VTVvuwVFUTVVV10kVTVVFUTV)dNdMu vw

nTVKVVFUTV3）Y

0/Y

0/（四）选择与校验100VS2S2NS2

≤

S2NLJLGJTJGB

50217-94。△Uφ＝UA-UB

ad

ab

ac

cbI

R

cos

X

sin

P

R

QX

UN△U

3I

R

cos

X

sin

1UNUU

%

100N10U

21(P

R

QX

)

ABI

R

jXP

jQaAU

BU

I

I

RjI

Xc

b

dn

(Pi

ri

Qi

xi

)2i

1i

1110UNnU

%

Ui

%

1n

(

pi

Ri

qi

Xi

)2i

110UNU

%

n

n2Ni=11

10UU

%

i=1

r0

pi

Li

x0

qi

Li

120r1

,

x1

,

l1r2

,

x2

,

l2p1

jq1p2

jq2P2

jQ2P1

jQ1R1

,

X1

,

L1R2

,

X2

,

L21.2.4.

N

alU

%

Ual

%A

Amin

k

latimaC3I

10或

A

ecjec

I

cA10kV或

Ic

Ia

lIalIcIal

＞Ic

4－2

220/380VTN-C

100m90kW＋70kvar20℃VV22-0.6/15％902

702

173.2A3

0.38205A20℃VV22－0.6/1－4×70173.2A2VV22-0.6/1－4×700.291Ω/km，x0＝0.069Ω/km。r0＝N10U

21U

%

(PR

QX

)

=

1

(90

0.2910.1+70

0.069

0.1)3UN70mm2p2q2I

10

0.382=2.15<5()x0n

n10U

2i

11

N

i

1

r0

pi

Li

x0

qi

Li

Ual

%2N0i

ii

ii

11

r0

n10U

Ual%

xq

Li

1n

p

L

r

0

A18.8Ω▲m×10－9

x04-310kV

LJ1m37℃Ual

%

＝51000kW+j500kvarBC

LJ10kVBCA800kW+j300kvar3km2kmr

p

L

p

L

x

q

L

q

L

0

1

1

2

2

0

1

1

2

2NAB＝0.35Ω/km110U

2UAC%

r0

1000kW3km800kW5km

0.35km

500kvar3km300kvar5km

10(10kV)2≤5LJ-700.344Ω/km1

9（3-7）r0＝0.46Ω/km，x0＝0r

≤0.564Ω/km22r

0

0.564

31.7mm

=56.2

mmA

UAC%=4.252

5ABN3U(

p

p

)2

(q

q

)21

2

1

2I

9LJ-7040℃215A310

kV35mm2LJ-70(1000

800)2

(500

300)2A

114A

3

10(PE

)3PEAPEAPE≥A

φAPE≥16mm2APE≥0.

5AφAφ

≤16mm216mm2<

A

φ

≤35mm2Aφ

>35mm2(PEN

)PE

N(N

)A0≥0.

5

A

φA0=

AφA0≥A

φ11232()11Ik2C321A

t(

)2In≥IcI2≤1.45Ial长延时瞬时QFtoIIr3Ir1FUtIoIrPE

N电源CBA外露可导电部分三相设备单相设备负荷PEPEN

ZsIa≤U0IaTN/s50.4TN231.

TN外露可导电部分电源CNBA外露可导电部分负荷三相设备单相设备RAIa≤50VIaTNTTTT2.

TT1InIcIn≥IcIn≥Kr[INM1＋Ic(n-1)],

Kr1.1～1.242）。3pi

I

k

.min

KI

nS(

)IN≥InIoc≥I"(3)1.I2≤1.

45IalIn≤Ial2.tIk0

.1

sC2A2＞I2tI2tIktCA

4-

455kW380V73s25℃103ABV－3×50NT18kA1.5kA4

41NT1-250222

NT1-250Ioc=120kA>I"(3)=8kA7×103A=721A3sNT1In≥Ic=103A42In＝160A1000AIn＝160AIN=250A3Sp

I

k.minI

n5s4NT1-250Ik=1500At=0.6sC＝115IktC15000.6

1151500

A160

A

10.1mm2

50mm29.4

6IN

≥InIr1IcIr1

≥K1IcIn≥Ic1～2h0.1s、0.2s、0.3s

0.4s0.02sIr3Ir3

≥K3[I/stm1+Ic(n-1)],

I/stm1Ir2

≥K2Ipk(

)

I

k.minpI

r

2(Ir3)S(

)0.02sI

csII

(3)cs

k0.02sIcscsshI

(3)IiK

＝1.3(

)1I2≤1.

45IalIr1

≤Ial2IktCA0.03sC2A2＞I2tI2t4-51In>Ic=160ACM1-225/3In=180A380VIc=160A22kWIN=42A,kst=7=8kA+35℃YJV－0.6/1－3×95＋1×50KI

(3)

=1.5kAKI

(1)IN

/

AIn

/

AIcu

/

kAIcs

/

kACM1-225L225100

125

140

160180

200

2253525CM1-225M5035CM1-225H8050Ik.minr

3S

p

IL

2

5

kA

M

3

5

kA、H

5

0

kALcs

KI

I=(32)

5kA>=8kAIr1=In=180A>Ic=160A

,Ir3＝5In

10InIr3≥K

[I/3

st.M1

c(n-1)+I

]

＝1.2×[

2×7×42＋(160－42)]

=847.2AIr3＝5In＝5×180A＝900A＞847.2A2CM1-225/31500

A

900

A1.67

1.332

Ial=256AIal=0.8×256A＝204.8A0.8Ir1=180A＜Ial＝204.8AI2tC=143CM1-225L

/3t＝0.1sIk=8000AIkC80000.1143t

17.7mm2

95mm2I

n.1≥1.6I

n.2I

n.2OIFU1FU2

FU1tFU2QF2IOI

r1.2tI

r3.1≥1.4I

r3.2I

r3.2I

r1.1≥2I

r1.2QF1QF2QF1I

r1.2OI

r3.2I

r1.1(1)I

r3.1≥1.2I

k2I

r2.1≥1.3I

r3.2QF2QF2(1)QF1QF1I

k2tIQF1QF2QF2

QF10.1s~0.2sI

r3.1≥1.2I

k2(1)I

k2(1)I

r3.2I

r2.1≥1.3I

r2.2I

r2.2I

r1.1≥1.3I

r1.2I

r1.2t1t2OtIFU1OQF2FU1QF2ItI

r1.2I

r3.2I

n.1≥3I

r1.2FU2OtQF1FU2QF1I

n.2I

r1.1I

r3.1I

r2.1≥10~12I

n.2I2.4-14-24-34-44-54-64-74-84-94-104-11P60~61P61~63P63P65~66P67P67P67P71~73P71

P72

4-6P78

81P794-124-134-144-15P82P84~

P85P88

P924-14-16YJ

V22-8.7/10

34-174-24-184-194-44-5123.，4．熔断器在线路过负荷或短路时，能利用其来切断故障，其保护特性具有 特性。123.4.5.？6.？7.8.?9.?1380V711537kW35mm2

259kACM1-100/370A107A3kAIn12In0.02s50A

80A

100A25kA12342.

10kV10kA1000A20kAS

9-1250/10/0.4kVVD4-1250kA20kA

4s0.1s0.5sAB3

380V

TN-C100m

BCA

B

C50m

B40kW+j

30kvar

C30kW+j

30kvar70+1

35/km115

B195A12kAVV22-0.6/1-3/km

x0=0.0694kA1600A0.02sr0=0.291C160Aual%

=5123。4.10kV1000kVA10/0.4kVYJ

V-8.7/10-350192A1438kAVS

1-121000A20kA50kA20kA

4s0.1s0.5s123（4）该线路选择是否满足短路热稳定条件？5.1600kW143x0=0.107

/km10kVcos

=

0.9190A8kA2kmYJ

V22-8.7/10-