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Dielectric Ageing of MV

non-shielded apparatus

November 2011

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   H   R   (   %

   )

+in Du,iao -e.u #uMin/hao

100

*0

0

(0

0

0

30

40

HR (%) by places

   T  e  m  p .   A  v  e  r  a  g  e

+in Du,iao -e.u #uMin/hao

3

30

4

40

2

20

1

10

Temp. by places

Shaoxing

Xia HeMin Zhao

Ningbo

Suzhou

2* 2 2 2(

(13(

4

 Accelerated ageing of unshielded solid

insulation in hot and humid climates

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 A$S panel life in South 5hina 6 ears

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5onditions for insulation surface creepage

7 condensation 8thermal ccle 9 humidit condensation 9

dr bands 

7 solid deposits 8 particules: dust: soot: salt conductive laer 

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Surface dielectric ageing model

*0

3

0

   5  o  n   t  a  c   t  a  n  g   l  e 

   ;   d  e  g   <

"A# $A#

TT

$

 

0:1

0:01

1

10

100

1000

   %  e

  a   =  a  g  e  c  u  r  r  e  n   t   $

   ;  m   A   <

(>6θ6 > 0>6θ6 1>

$oss of hydrophobicity

during "A#

ears months dastime

South 5hina 6 ears

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SM 4000h acceleated ageing test

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Earl stages of ageing

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 Advanced stage of ageing

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%ate ageing8 corona activit along dr bands

 o?one emission

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%ate ageing8 5orona activit along dr bands

 o?one emission

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#rac=ing and flashover 

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Standard test protocol8 $E5 22(1-403

72h @et or dr ccles7 40 6 # 6 0>5

7 0 6 6 *B

induces @ater condensation

7%evel 1

7 03h ;4C(<

7%evel2

7 11(h ;(C(ours<

%evel 1

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22(1-4038

ost-ageing test8

;0*42 proc' F 8 aprGs

lavage de lHappareil

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 Ageing issues due to @rong design change

7 Kse of too large V#s 9 barriers 8 small air gaps corona epoI ageing

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Le points to remember 

7 Ageing issues are lin=ed @ith severe environmental 9 bad installations conditions7 Avoid too much humidit 9 temperature ccles Adapted ventilation of the substation ;9heaters<

7 umidit: condensation: dust: ' strongl decrease the ioni?ation level of air 4=V)mm  less than 1=V)mm

7 5orona discharge ; o?one smell