Hv Owts 150 250 Kv Sebakmt
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Transcript of Hv Owts 150 250 Kv Sebakmt
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8/9/2019 Hv Owts 150 250 Kv Sebakmt
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April 2006
Condition Assessment on Transmission Cables usingOWTS HV Technology
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Go a l o f PD O n - s i t e Te s t i n g / D i a g n o s i s : new installed Power Cables
during after-laying test (in combination with voltagewithstand test)
to recognize poor workmanship in cable accessories,
by checking up to 1.7U0 2.0U0 the PD-free condition of cableaccessories,
and in the case of PD presence an evaluation of the PD levelpreferably in [pC] and repair of the particular accessory.
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Go a l o f PD O n - s i t e T es t i n g / D i a g n o s i s :service aged Power Cables
during service life (as a part of on-site condition assessment)
to support the maintenance- and operation decisions,
by detecting and localising PD’s in cable insulation and cableaccessories,
and in the case of PD presence an evaluation of the PDoccurrence (PDIV, PD-levels, PD patterns) and comparison tothe acceptance norms for particular types of cable insulationand accessories.
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O n - s i t e P D D ia g n o s t i c M e t h o d o l o g i e s
OWTS® methodology
on-site PD detection and localisation as well asdielectric losses measurement in cableinsulation and accessories using
Damped AC voltages up to 250kV
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O n - s i t e En e r g i z in g u s in g D am p e d AC V o l t a g e ( D AC)
D
a m p e d A C
v o l t a g e
Partial discharge parameters :
PDIV, PDEV, PD level, PD location
Dielectric losses
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250kV HV
Supply
Inductor L
HVDivider
250kV solid-
state switch
1 6 0 0 Resistor R
2000
Te s t Se t u p OW TS t y p e 2 5 0 k V p e a k ( since 2004 in field test)
Test object: HV power
cable up to 230 kV
Control and
data
processing
unit
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( O u t - d o o r ) On - s i t e t e s t i n g u s i n g d a m p e d A C 2 5 0 k V :PD a n d d i e le c t r i c l o s s e s
Weight: 300kgSupply voltage: 220V
Max. load at 250kV: 8 F Output: DAC voltage 250kV (50 Hz - 500 Hz)
Test object: power cables: 100m -20km
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Te s t Se t u p OW TS t y p e 1 5 0 k V p e a k
150 kVpeak CoilUnit
150 kVpeak HV Unit
HV Divider and PD
analyser Unit
Computer Control Unit
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Ex a m p l e 1 :
A f t e r - l a y i n g t e s t a n d P D
i n s p e c t i o n o f a 5 0 k V
X LPE c a b l e s e c t i o n
Su b s t a t i o n o f Ra i l w a y
Po w e r s u p p l y
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Ex a m p l e 1 :
PD o n - s i t e d i a g n o s i s u p t o 2 x U 0 ( 6 k m / 5 0 k V ; X LPE)
L3: PDIV @ 82kV
PD~180 pC
L1, L2 : up to 2xUo PD free
Noise level < 10 pC
L3: PDIV @ 82kV
PD~180 pC
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Ex a m p l e 1 :
PD o n - s i t e d i a g n o s i s u p t o 2 x U 0 ( 6 k m / 5 0 k V ; X LPE)
: ~ 1 8 0 p C l o ca t e d i n t h e t e r m i n a t io n L1 , L2 : u p t o 2 x U o PD f r e e ( PD < 1 0 p C) L3 : PD I V @ 8 2 k V ; PD l e v e l
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50kV Power Cable
250kV HV Switch
3.5 H Inductor
250kV HV Supply
HV Control UnitPD Analyzer
OWTS 250kV
(total weight 300kg)
( I n - d o o r ) On - s i t e t e s t i n g u s in g
d am p e d AC 2 5 0 k V : PD a n d d i e l e c t r i c l o s se s
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Ex a m p l e 2 :
PD d i a g n o s i s o f a
s e r v i ce a g e d 5 0 k V -
p a p e r - o i l - c a b l e
PD I V L1 , L 2 , L 3 :
0 . 7 x U 0
@ 1 .0 x U 0 PD L1 : 2 5 0 0 p C
PD L2 : 1 7 8 0 p C
PD L3 : 2 3 0 0 p C
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PD vs Ut
0
2000
4000
6000
8000
10000
12000
14000
0.5 0.7 1 1.3 1.5 1.7
Meetspanning Uo
O n t l a d i n g s n i v e a u ( p C )
Fase L1
Fase L2
Fase L3
Ex a m p l e 2 :
PD d i a g n o s i s o f a
s e r v i ce a g e d 5 0 k V -
p a p e r - o i l - c a b l e
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Ex a m p l e 3 :
PD d i a g n o s i s o f a s e r v i ce a g e d 1 5 0 k V X LPE c a b l e
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Ex a m p l e 3 :
PD d i a g n o s i s o f a
s e r v i ce a g e d 1 5 0 k V
X LPE - i n s u l a t e d
p o w e r ca b l e
Ph a s e L1 : PD I V 1 .7 x U o
Ph a s e L2 , L 3 : PD f r e e u p
t o 2 x U o
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Ex a m p l e 3 :
PD d i a g n o s i s o f a
s e r v i ce a g e d 1 5 0 k V
X LPE - i n s u l a t e d
p o w e r ca b l e
Te r m i n a t i o n p r o b l em Ph a s e L1 : PD I V 1 .7 x U o
P h a s e L2 , L 3 : PD f r e e u pt o 2 x U o
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PD p a r a m e t e r s a r e u s e f u l t o g e n e r a t e PD n o r m s
PD parameters Weight factor
PD inception voltage (PDIV) 4
PD source location (cable/accessories) 2
PD mapping (interpretation) 1
PD inception voltage PDIV 8
Average at U 0 4
Maximum at U 0 3
Average at 2U 0 2
Maximum at 2U 0 1At U 0 4
At 2U 0 2
Phase resolved PDpattern
Interpretation 2
PD occurrencefrequency
PD levelIndividual
cable
components
Cable system
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Ex am p l e :
N o r m Ge n e r a t i o n ( PD l e v e l @ 1 .0 U 0 ) f o r M a s s - i n s u l a t e d Ca b l eTe r m i n a t i o n s Ty p e w i t h I n t e r f a c i a l D i s c h a r g e s o n t h e H V Co n n e c t o r s
(a) (b)
t h e b e s t f i t t i n g : l o g n o r m a l d i s t r i b u t i o n p o p u l a t i o nb o u n d a r i e s : 4 .3 n C ( 9 0 % ) ; 6 .5 n C ( 9 5 % )
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S u m m a r y
I . B a s e d o n t ech n o l o g ie s a s a v a i l a b le n o n - d es t r u c t i v e PD d i a g n o s i s ca n b ed o n e b y :
i . VH F/ UH F PD d e t ec t i o n i n com b in a t io n w i t h m o b i l e r es o n a t e ACv o l t a g e s o u r c e s ;
i i . I EC6 0 2 7 0 d e t e c t i o n a t d am p ed AC v o l t a g e s a s a v a i l a b l e w i t h OW TS2 5 0 ;
I I . W i t h r eg a r d t o H V p ow e r ca b le s a n d PD o n - s i t e d ia g n o s i s t h e f o l l o w i n gc a n b e c o n c lu d e d :
i . Qu a l i t y i s su e ; d u r i n g a f t e r - l a y i n g t e s t o f n e w c ab l e s PD d e t e c t i o nm a y p r o v i d e s v a l u a b l e i n f o r m a t i o n a b o u t d i s ch a r g i n g d e f e c t s i nc a b l e a c ce s s o r i e s ;
i i . M a i n t e n a n c e a n d o p e r a t i o n i ss u e ; d u r i n g co n d i t i o n i n sp e c t i o n s
o f s e r v i c e a g e d c a b l e sy s t em s PD d i a g n o s is m a y p r o v i d ei n f o r m a t i o n a b o u t i n s u l a t i o n d e f ec t s i n c a b l e i n s u la t i o n a n d ca b l ea c c e s s o r i e s ;
I I I . B a s e d o n f i e l d a p p l i c a t i o n s t a t i s t i c a l n o rm s ca n b e d ev e l o p e d t o s u p p o r tt h e co n d i t i o n e v a l u a t i o n f o r m a i n t e n a n c e p u r p o s e s .