solid insulation ageing
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Dielectric Ageing of MV
non-shielded apparatus
November 2011
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Schneider Electric 2- Energ ! "EN#$%S &' ! 2()0*)11
H R ( %
)
+in Du,iao -e.u #uMin/hao
100
*0
0
(0
0
0
30
40
HR (%) by places
T e m p . A v e r a g e
+in Du,iao -e.u #uMin/hao
3
30
4
40
2
20
1
10
Temp. by places
Shaoxing
Xia HeMin Zhao
Ningbo
Suzhou
2* 2 2 2(
(13(
4
Accelerated ageing of unshielded solid
insulation in hot and humid climates
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Schneider Electric 4- Energ ! "EN#$%S &' ! 2()0*)11
A$S panel life in South 5hina 6 ears
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Schneider Electric - Energ ! "EN#$%S &' ! 2()0*)11
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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Schneider Electric - Energ ! "EN#$%S &' ! 2()0*)11
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>
$oss of hydrophobicity
during "A#
ears months dastime
South 5hina 6 ears
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SM 4000h acceleated ageing test
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8/9/2019 Solid Insulation Ageing
8/18Schneider Electric - Energ ! "EN#$%S &' ! 2()0*)11
Earl stages of ageing
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Advanced stage of ageing
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10/18Schneider Electric 10- Energ ! "EN#$%S &' ! 2()0*)11
%ate ageing8 corona activit along dr bands
o?one emission
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Schneider Electric 11- Energ ! "EN#$%S &' ! 2()0*)11
%ate ageing8 5orona activit along dr bands
o?one emission
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Schneider Electric 12- Energ ! "EN#$%S &' ! 2()0*)11
#rac=ing and flashover
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Schneider Electric 14- Energ ! "EN#$%S &' ! 2()0*)11
Standard test protocol8 $E5 22(1-403
72h @et or dr ccles7 40 6 # 6 0>5
7 0 6 6 *B
induces @ater condensation
7%evel 1
7 03h ;4C(<
7%evel2
7 11(h ;(C(ours<
%evel 1
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Schneider Electric 13- Energ ! "EN#$%S &' ! 2()0*)11
22(1-4038
ost-ageing test8
;0*42 proc' F 8 aprGs
lavage de lHappareil
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Schneider Electric 1- Energ ! "EN#$%S &' ! 2()0*)11
Ageing issues due to @rong design change
7 Kse of too large V#s 9 barriers 8 small air gaps corona epoI ageing
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Schneider Electric 1- Energ ! "EN#$%S &' ! 2()0*)11
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
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