Online System Monitoring and Effect of Harmonics on Power Transformer
Loss of Life Using S-Transform
Oleh :Dimas Okky Anggriawan2213201018
Topic for Candidate Thesis
2
Online System Monitoring
3
DFT
dtftetxfX 2).()( FT Kontinyu
FT Diskrit
1
0
)]2sin()2)[cos(()(N
n Nnmj
NnmnxmX
1
0
2
)()(N
n
Nmnj
enxmX
imajiner
riilimajinerriil mX
mXmXmXmX)(
)(tan)()()( 122
1
0
)2cos()()(N
nriil N
nmnxmX
1
0
)2sin()()(N
nimajiner N
nmnxmX
4
STFT
n
jwnemnwnxwmX ][][),(
n N
nmjNnmmnwnxwmX ]]2sin[]2][cos[[][),(
dtemtwtxwmX jwt)()(),( STFT Kontinyu
STFT Diskrit
5
S-Transform
S – Transform Diskrit
NmjiN
m
enmGNT
nmHNTnjTS
21
0
),(,
2
2222
),( nm
enmG
6
Transformer Losses
LLNLT PPP
OSLECRILL PPPP 2
Wattloss, load Wattloss, load no
Wattloss, total
LL
NL
T
PPP
lossstray other losscurrent eddy
windingin the loss2
OSL
EC
RI
PP
P
7
Transformer Losses
max
1
22
h
h R
hRECEC I
IhPP
max
1
28.0
h
h R
hROSLOSL I
IhPP
Wlosses,stray other rated Order Harmonic
A Current, Rated A h,order harmonicat Current Wlosses,current eddy rated
OSL
R
h
REC
PhIIP
8
Top Oil Temperature
9
Hot Spot Temperature And Aging
Factoron Accelarati Aging AAF
10
References
Rodriguez, M.V., Troncoso, R.J., Perez, A.G., “Detection and Classification of Single and Combined Power Quality Disturbances Using Neural Networks” IEEE Transactions on Industrial Electronics, Vol. 61, No.5., 2014
Fernandes, R.A.S., Silva, I.N.D., Oleskovics, M., “Load Profile Identification Interface for Consumer Online Monitoring Purposes in Smart Grids” IEEE Transactions on Industrial Informatics, Vol. 9, No.3., 2013
He, S., Li., K., Zhang., “A Real-Time Power Quality Disturbances Classification Using Hybrid Method Based on S-Transform and Dynamics”., IEEE Transactions on Instrumentation and Measurement, Vol. 62, No.9., 2013
Taheri, S., Taheri, H., Fofana, Issouf., Hemmatjou, H., Gholami, A., “ Effect of Power System Harmonics on Transformer Loading Capability and Hot Spot Temperature”., Electrical and Computer Engineering Conference ., 2012
Said, D.M., Nor, M., “Effect of Harmonics of Distribution Transformers”., Power Engineering Conference., 2008
Elmoudi, A., Lehtonen, M., Nordman., “Effect of Harmonics on Transformers Loss of life”., IEEE International Symposium on Electrical Insulation., 2006
R.G, Stockwell., “Why Use S- Transform”., Field Institute Communication