司马文霞1,冯杰1,杨庆1,赖向平1,余德芬2,MFarzaneh2

27

27

Vol.27No.27Sep.2007

2007

9

ProceedingsoftheCSEE

TM835.4

©2007Chin.Soc.forElec.Eng.

0258-8013(2007)27-0013-06

A

470⋅40

1

1

1

1

2

M.Farzaneh2

2

(1

400044

2

CIGELEQuébecG7H2B1,Canada)

ThePropertiesofPositiveDCCoronaDischargeinIcedElectrode

SystemUnderLowAtmosphericPressure

SIMAWen-xia1,FENGJie1,YANGQing1,LAIXiang-ping1,D.Yu2,M.Farzaneh2,J.Zhang2

(1.TheKeyLaboratoryofHighVoltageEngineeringandElectricalNewTechnologyoftheMinistryofEducation,Collegeof

ElectricalEngineering,ChongqingUniversity,ShapingbaDistrict,Chongqing400044,China;

2.CIGELE,UniversitéduQuébecàChicoutimi,QuébecG7H2B,Canada)

ABSTRACT:Lowairpressureandrecurrenticingmayaffect

thedischargecharacteristicsofdielectricsanddecreasethe

insulatingperformanceofinsulators.Theaimofthispaperisto

investigatethecoronadischargephenomenaonice-covered

insulatorsatlowairpressurebasedonanicicle/iced-plate

electrodesystemwithdirectcurrent(DC)positivevoltage.

Usingapulsecurrentsensorandanultravioletcamera,

0

CoroCAMIV+,itwaspossibletocarryoutinvestigationson

theinfluenceofatmosphericpressureoncoronaonsetvoltage,

dischargemode,dischargewaveformandmeandischarge

[1-3]

amplitude.Anempiricalfunctionforpredictingcoronaonset

voltagewasdeveloped,sheddingmorelightontheinfluenceof

pressureonmeanpulseamplitudeofpartialdischarge(PD).

Thetheoreticalanalysisindicatesthatthecoronaonsetvoltage

ofthetestedclearancedecreasesexponentiallywiththe

increaseofaltitude,andthatthespecialexponentsareaffected

bythelengthofclearance.Theresultsofthisstudywill

advanceourknowledgeofcoronadischargesaticicletipsand

helptocalculatemorepreciselytheelectricfielddistribution

alongice-coveredinsulators.

[3-5]

[1-6]

[7-8]

KEYWORDS:directcurrent;lowatmosphericpressure;ice;

coronaproperties

–

[5,9-10]

Uinc

SF6

CoroCAMIV

+

[11]

[12]

(90210026)

ProjectSupportedbyNationalNaturalScienceFoundationofChina

[11]

(90210026).

14

27

2

[13]

–

[3,5]

CIGELE

735kV

1

18°

[7]

2.5mm

–

[3-6]

–

[13]

2

σ=80µS/cm

(T=0)

Uinc

Uinc

5cm

98.788.7

1

78.7

17.7

68.7kPa

21.0419.57

15.98kV

[7,11]

3.8m×2m

−36

[13]

25

9cm

30kPa

7cm

5cm

V

22

19

16

13

k

/

2.5mm

−12

8h

[13]

3cm

3~9cm

2m

65

75

8595

/kPa

105

CoroCAM

+

Τ

(=0)

2

−5

1

Fig.2Coronainceptionvoltages

invariouspressures(=0)

Τ

1

=3kΩR=30k

Ω

H

R

K

m

m

C

A

E/N

B

S

I

C

I

E

F

T

B

N

R

R∞

~

PC

m

O

T—

25kVA

B—

100kV/10kVA

F

S—

Rm—

C—

I—

O—

[5,9]

H—

PC—

SE—

K—

CA—

BI—

U/U=(p/p)m

(1)

(2)

1

0

0

U

U0

p

Fig.1Coronadischargemeasurementsystem

p0(101.3kPa)

m

98.788.778.7

–

68.7kPa

98.7kPa

1kV/s

U/U=(p/p)m

inc

inc0

0

UincUinc0

p

27

15

∆U=(0.9118−0.0284d)∆p

∆U=(U−U)/U

(8)

p0(101.3kPa)

–

inc0

inc

inc0

U=U(p/p)m

(3)

3

(9cm)

inc

inc0

(3)

0

(

3000m

2

)

–

Uinc

p/p0

d=5cm

0.9

5

3

Uinc

p

(3)

1

d

Uinc0

90kPa

m

1

m

4

25

9cm

22

19

16

13

V

k

5cm

3cm

/

c

n

U

i

7cm

0.60.70.80.91.0

(a)98.7kPa20.8kV

(c)78.7kPa17.6kV

(b)88.7kPa19.5kV

(d)68.7kPa16kV

p/p0

3

U

p/p

0

inc

Fig.3Uincvsp/p0

1

d

U

m

inc0

Tab.1SpecialindexmandUinc0invariousgapspacing

d/cm

5

Fig.5Inceptioncoronadischargeimagesandvoltages

againstvariouspressures

3579

Uinc0

/kV

19.48621.53823.41325.062

0.83030.76790.70700.6616

m

0.9

m0.7

2

0.5

246

8

10

d/cm

m=−0.0284d+0.9118

R

2=0.9949

4

m

Fig.4Specialindexmasafunctionofgaplength

m

[7]

m=−0.0284d+0.9118

(4)

(5)

(6)

(4)

(3)

U=U(p/p)−0.0284d+0.9118

+HO+eRO(HO)+hυ

−

222

O

inc

inc0

0

2

∆p=(p−p)/p

(5)

hυ

0

0

U=U(1−∆p)−0.0284d+0.9118

inc

(6)

inc0

∆p=0

3

d=7cm

U=U[1−(0.9118−0.0284d)∆p]

(7)

6

inc

inc0

3×10

5

16

27

/s

33ns

6

600ns

6

98.788.778.7kPa

336699ns

4

M.Cernak[14]SF6

7cm

Morrow

[15]

Uinc~1.1Uinc

(>50)

7

600

400

200

0

2

C

p

/

2

0.4

98.7

88.778.768.7

p/kPa

A0.2

m

R2=0.939

/

(d=7cm)

i

7

0.0

Fig.7Averagechargequantityofdischargepulseandthe

correspondingstandarddeviationatvarious

airpressures(d=7cm)

43.65143.652

43.653t/ms

(a)p=98.7kPa

U=23.5kV

0.5

0.3

7

A

m

i

/

0.1

80kPa

−0.1

30.134430.1355

98.788.778.768.7kPa

30.1365t/ms

334.0482.5539.2

248.8pC

(b)p=88.7kPa

U=20.5kV

0.8

7

0.939

0.4

0.0

A

m

/

i

Q=−1.097p2+185.7p−7315

(9)

46.855746.8565

46.8575

t

/ms

[16]

Q

(c)p=78.7kPa

U=19kV

α

0.4

α=Ape−Bp/E

(10)

0.2

0.0

A

m

/

A=11.1cm⋅kPaB=275V/(cm⋅kPa)

i

α/E

η

39.284539.2855

39.2865t/ms

(d)p=68.7kPa

U=17.3kV

6

Fig.6Typicalwaveformofcurrentpulseundervarious

(d=7cm)

(10)

η=α/E=Ape−Bp/E/E

(11)

atmosphericpressures(d=7cm)

27

17

η

η=f(E/p)

E/p

2

η=f(E/p)

8

(14)

0.015

3

0.013

0.011

0.009

0.007

1

–

−

V

η/

1

2

0

200400600800

E/p/(V/(cm⋅kPa))

m

8

η=f(E/p)

ηasafunctionofE/pforair

Fig.8

η

dη

AB

A

=

e−Bp/E

−

e−Bp/E=0(12)

d(E/p)(E/p)3

(E/p)2

3

4

E/p=B

(13)

η

α

η

α

7

80kPa

8

7

2000m

80kPa

2000m

[1]

[2]

[M]

[11]

2002

2U

1

ξξ

E=

inc

ln(4d/r)⋅r+2−2/d

(14)

[J]

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ξ

cm

JiangXinliangXieShujiaoShuLichunetalIceflashoverperformace

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33.74kV/cm

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technicalcontextandenvironmentalexposure[J]

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[4]

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ZhangZhijin

JiangXingliang

MaJun

etal

Studyonicing

Φ=2r

performanceof110kVinsulatorstringsatACservicevoltage

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ξ

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Fig.9Icicle/iced-plateelectrodesystem

σ=80µS/cm

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