152638716 Doble Lemke Power Transformer Advanced PD Monitoring UHF 2009

7/24/2019 152638716 Doble Lemke Power Transformer Advanced PD Monitoring UHF 2009

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Advanced PD Monitoring of Power TransformersSupporting Asset Management

www.ldic.de

Gregor Pudlo

Doble Lemke

Germany

Switzerland


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Abstract

Reasons for (PD monitoring of transformers

Partial Disc!arge Detection principles

"lectrical PD diagnostic tec!ni#ues

$ PD measuring circuits according to %"& ')*

Advanced tools for PD monitoring

$ Acoustic and electromagnetic PD measuring principle

$ &one+s!aped drain valve ,-.+sensors / Performance &!ec0

$ &ase studies 1 ,-. PD measurements


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Reasons2 PD Monitoring of Power Transformers

Power transformers are t!e most important and e3pensive

pieces of e#uipment in substations4

A new power transformer costs millions of dollars4

,nplanned outage and repair costs5 penalties5 etc4 sum up

Transformers design life is )+67 years4 8it! proper maintenance t!ey can remain in service for '

years4

As transformers age5 t!eir internal conditions degrade w!ic!

increases t!e ris0 of failures4

Time+based maintenance c!anges to condition+basedmaintenance approac!es


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Partial Disc!arge Detection Principles

Optical

Mechanical

Chemical

Acoustic

Opto-acoustic

HV

Electrical IEC 60270

HF/VHF/UHF

Optical Eects

!"i#ht$

%ressure &a'e

!(oun)$

*ischar#e Eects

*ielectric "osses

Hi#h Fre+uenc,

&a'es

Chemical Eects

Heat

Macroscopic+P!ysical"ffects

*etection Metho)s

*rat IEC 62 7.


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PD measuring circuits according to IEC 60270

a)coupling device in series wit! t!e coupling capacitor b)measurement at a bus!ing tap

ComponentsA& voltage source U5 optional bloc0ing impedance Z5 coupling capacitor C

K5

measuring impedance Zm5 a measuring instrument Mand generalized test ob9ectC

a4

1ni# 3445

!re"uentl# used circuit intest laboratories

o!ten applied in on$site%on$line PD in&estigations


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PD 'easuring Impedance !or (using *ap Installation

Decoupling of PD signals from t!e bus!ing tap

in a wide fre#uency range up to 6 M-z

:ower cut+off fre#uency ; ' 0-z

Additional voltage signal for p!ase+resolved

measurements

Superimposed PD and test voltage signal

)7 mm5 lengt! >) mm?8eig!t2 ) 0g

Special feature for continuous PD monitoring (%P '@

7 0< Transformer us!ing


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IEC 62+7, $ Dra!t le&el

-on$con&entional PD$measurements/

$Electromagnetic PD Detection in te 1%31%41) $ range

$5coustic PD measurements

$'ied acoustic and electromagnetic metod

$ PD location in Power *rans!ormers and 8eactors


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Advanced tools for PD monitoring 1 "lectromagn4 PD Tests

Cone$saped acti&e drain &al&e 41$sensors

for t!e decoupling of electromagnetic PD signals from t!e inner of an o il+paper+insulated transformer

PD+signals in t!e ,-. fre#uency range

(mainly 6 M-z 1 > G-z

sensors support BPerformance/Sensitivity &!ec0C (!ig!+fre#uency test impulses can be in9ected wit!

additionally integrated electrode

sensor !ead is grounded (for lower fre#uencies

sensor application at oil valves5 w!ic! are available e4g4 for oil filling or draining (li#uid tig!tness is

tested for >)& warm oil wit! 7 bar compression


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Per!ormance Ceck

.unctional c!ec0 of t!e w!ole measuring pat! including sensors and partial disc!arge (PD

ac#uisition system t!roug! in9ection of !ig!+fre#uency test impulses

Bsingle+portC solutions are possible

t!e Performance &!ec0 BcontrolsC e4g4 t!e effect of a contact to grounded elements wit!in t!e

oil valve4

Cone$saped acti&e 41$sensorD 90%,0 oil gate$&al&e)

41 PD spectra !or groundedand ungrounded sensor ead

input pat

output pat


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Transformer

Drain valve

41 PD probe D,0

Eutput

%nput

Pre+amplifier

-ig!+pass filter

Per!ormance Ceck

Per!ormance ceck at 790 '1:

Pase$resol&ed &iew in 41 PDde&ice LD;$6%41


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Case stud# ( $ on$line 41 PD measur. o! a 200 '35 single$pase trans!ormer

6@/))0


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Case stud# C $ on$line 41 PD measur. o! a 4 G-z

gas+in+oil !ydrogen indication BuselessC due to active !ot spot customer wanted to test for PD and c!ec0 a potential load dependency of PD

full in+service sensor application and measurement

%nception and e3tinction voltage could be identified5 load dependency e3cluded

5pplicationbene!it

-00 -20 0 20 00 70 3000

-30

-300

-0

0

0

300

30

amplitu)e!mV$

time !ns$

0800 082 080 087 38000

2

6

.

30

32

amplitu)e!Vs$

re+uenc, !9H:$


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41 PD 'easurements and

deli&ered 41 PD Probe D90%,0*aiwan

Taipe!

Cina

S!angai

(elgium:in0ebee0

=erman#

erlin

-eidenau

Riesa

Ireland > 4?

Ardnacrus!a

&as!la

Dublin

:out!

Pilippines

Manila

;audi 5rabiaFedda!

Fizan

45E

Dubai

Eg#ptairo

Colombiaogota


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41 PD measurements in Ireland


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5pplication bene!it

$ Tested measurements !ave been performed using non+conventional decoupling met!ods ta0ing

advantage of electromagnetic field coupling$ PD measurements on t!e power transformers !ave been functioned on t!e drain valves of t!e 6+ p!ase

>>/))70< power transformers wit! t!e !elp of t!e ,-. probe D= 7

$ T!ree transformers found wit! minor PD activity5 one transformer wit! clear PD

Locations

$ Lout

$ Dublin

$ 5rdnacrusa

$ Casla


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Drain 3al&e

5pplied 41 Drain3al&e ;ensor

'ounting o! te41 Probe D90 wit5dapter D90%D,0)

'easuring ;#stemLD;$6%41

'easuring Instrument

$ PD Measuring System :DS+'/,-.

$ ,-. Probe D=7 (wit! Adapter D=7/D=@

$ ,-. &alibrator :D&+'/,-.

$ Pre Amplifier :DA+7/G%S



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3 @ 990 m3 at measuring

!re"uenc# 960 '1:

3 @ 2


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41 PD measurements in i:an ;audi 5rabia


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Drain 3al&e Power *rans!ormer

on


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PRPD Pattern at t!e measuring

fre#uency of H M-z < I >** m

152638716 Doble Lemke Power Transformer Advanced PD Monitoring UHF 2009

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