Hv Owts 150 250 Kv Sebakmt

8/9/2019 Hv Owts 150 250 Kv Sebakmt

1/20

April 2006

Condition Assessment on Transmission Cables usingOWTS HV Technology


2/20

April 2006

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.


3/20

April 2006

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.


4/20 April 2006

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


5/20 April 2006

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


6/20 April 2006

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


7/20 April 2006

( 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


8/20 April 2006

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


9/20 April 2006

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


10/20

April 2006

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


11/20

April 2006

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


12/20

April 2006

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


13/20

April 2006

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


14/20

April 2006

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 :


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


15/20

April 2006

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


16/20

April 2006

Ex a m p l e 3 :


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


17/20

April 2006

Ex a m p l e 3 :


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


18/20

April 2006

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


19/20

April 2006

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 % )


20/20

April 2006

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 .

Documents

Hv Owts 150 250 Kv Sebakmt