LEAKAGE CURRENT ANALYSIS OF POLYMERIC INSULATION USING LINEAR TIME FREQUENCY DISTRIBUTION
Erosion on polymeric insulator surface caused by pollution affects their performance, until now there are no specific methods to determine their service life. Surface condition and their pollution severity of an insulator can be monitor by using leakage current frequency components. This pa...
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| Main Authors: | , , , |
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| Format: | Conference or Workshop Item |
| Language: | en |
| Published: |
2012
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| Subjects: | |
| Online Access: | http://eprints.utem.edu.my/id/eprint/9354/1/2012_Paper_LEAKAGE_CURRENT_ANALYSIS_OF_POLYMERIC_INSULATION_USING.pdf http://eprints.utem.edu.my/id/eprint/9354/ |
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| Summary: | Erosion on polymeric insulator surface caused by
pollution affects their performance, until now there are no
specific methods to determine their service life. Surface
condition and their pollution severity of an insulator can be
monitor by using leakage current frequency components.
This paper presents time frequency distributions (TFD) for
leakage current of polymeric insulation for high voltage
applications. Tracking and erosion test (Inclined Plane Test
(IPT)) complying with BS EN60587-2007 is conducted on
polymeric insulation to collect different leakage current
patterns. Since fast Fourier transforms (FFT) has limitation
to analyze non stationary signal, thus time frequency
distributions (TFD) shown in time frequency representation
(TFR) with temporal and spectral is used. The verification
using both methods on several disturbances signal with
known parameters have been made and mean absolute
percentage error (MAPE) used to identify the accuracy of
both methods. The parameters measured are root mean
square (RMS), total harmonic distortion (THD), total non
harmonic distortion (TnHD) and total waveform distortion
(TWD) used to determine the best method to analyze
leakage current. The comparison shows that s-transform
method is offer higher accuracy than spectrogram because it
has better time and frequency resolution. |
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