152638716 doble lemke power transformer advanced pd monitoring uhf 2009
TRANSCRIPT
-
7/24/2019 152638716 Doble Lemke Power Transformer Advanced PD Monitoring UHF 2009
1/21
1
Advanced PD Monitoring of Power TransformersSupporting Asset Management
www.ldic.de
Gregor Pudlo
Doble Lemke
Germany
Switzerland
-
7/24/2019 152638716 Doble Lemke Power Transformer Advanced PD Monitoring UHF 2009
2/21
2
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
-
7/24/2019 152638716 Doble Lemke Power Transformer Advanced PD Monitoring UHF 2009
3/21
3
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
-
7/24/2019 152638716 Doble Lemke Power Transformer Advanced PD Monitoring UHF 2009
4/21
5
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.
-
7/24/2019 152638716 Doble Lemke Power Transformer Advanced PD Monitoring UHF 2009
5/21
6
"lectrical PD diagnostic tec!ni#ues
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
-
7/24/2019 152638716 Doble Lemke Power Transformer Advanced PD Monitoring UHF 2009
6/21
7
"lectrical PD diagnostic tec!ni#ues
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
-
7/24/2019 152638716 Doble Lemke Power Transformer Advanced PD Monitoring UHF 2009
7/21
9
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
-
7/24/2019 152638716 Doble Lemke Power Transformer Advanced PD Monitoring UHF 2009
8/21
10
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
-
7/24/2019 152638716 Doble Lemke Power Transformer Advanced PD Monitoring UHF 2009
9/21
12
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$&al&e)
41 PD spectra !or groundedand ungrounded sensor ead
input pat
output pat
-
7/24/2019 152638716 Doble Lemke Power Transformer Advanced PD Monitoring UHF 2009
10/21
14
Transformer
Drain valve
41 PD probe D,0
Eutput
%nput
Pre+amplifier
-ig!+pass filter
Per!ormance Ceck
Per!ormance ceck at 790 '1:
Pase$resol&ed &iew in 41 PDde&ice LD;$6%41
-
7/24/2019 152638716 Doble Lemke Power Transformer Advanced PD Monitoring UHF 2009
11/21
17
Advanced tools for PD monitoring 1 "lectromagn4 PD Tests
Case stud# ( $ on$line 41 PD measur. o! a 200 '35 single$pase trans!ormer
6@/))0
-
7/24/2019 152638716 Doble Lemke Power Transformer Advanced PD Monitoring UHF 2009
12/21
18
Advanced tools for PD monitoring 1 "lectromagn4 PD Tests
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:$
-
7/24/2019 152638716 Doble Lemke Power Transformer Advanced PD Monitoring UHF 2009
13/21
19
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
-
7/24/2019 152638716 Doble Lemke Power Transformer Advanced PD Monitoring UHF 2009
14/21
21
41 PD measurements in Ireland
-
7/24/2019 152638716 Doble Lemke Power Transformer Advanced PD Monitoring UHF 2009
15/21
22
41 PD measurements in Ireland
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
-
7/24/2019 152638716 Doble Lemke Power Transformer Advanced PD Monitoring UHF 2009
16/21
23
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
41 PD measurements in Ireland
-
7/24/2019 152638716 Doble Lemke Power Transformer Advanced PD Monitoring UHF 2009
17/21
24
3 @ 990 m3 at measuring
!re"uenc# 960 '1:
3 @ 2
-
7/24/2019 152638716 Doble Lemke Power Transformer Advanced PD Monitoring UHF 2009
18/21
25
41 PD measurements in i:an ;audi 5rabia
-
7/24/2019 152638716 Doble Lemke Power Transformer Advanced PD Monitoring UHF 2009
19/21
26
41 PD measurements in i:an ;audi 5rabia
Drain 3al&e Power *rans!ormer
on
-
7/24/2019 152638716 Doble Lemke Power Transformer Advanced PD Monitoring UHF 2009
20/21
27
41 PD measurements in i:an ;audi 5rabia
PRPD Pattern at t!e measuring
fre#uency of H M-z < I >** m