Polymeric Insulation surface condition Analysis Using Linear Time Frequency Distributions
Polymeric insulator exposed to pollution leads to tracking and erosion affects their performance. There are no specific method to determine their service life. Most studies shows surface condition and their pollution severity of an insulator can be monitor by using leakage current frequency compone...
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| Main Authors: | , , , , |
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| Format: | Conference or Workshop Item |
| Language: | en |
| Published: |
2013
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| Subjects: | |
| Online Access: | http://eprints.utem.edu.my/id/eprint/11327/1/2013_PEOCO_Polymeric_insulation_surface_condition_analysis_using_linear_time_frequency_distributions.pdf http://eprints.utem.edu.my/id/eprint/11327/ http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6564610&tag=1 |
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| Summary: | Polymeric insulator exposed to pollution leads to tracking and erosion affects their performance. There are no specific method to determine their service life. Most studies shows surface condition and their pollution severity of an insulator can be monitor by using leakage current frequency
components. This paper presents linear time frequency
distributions (TFDs) 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. Fast Fourier transforms (FFT) unable to provide
temporal information and has limitation to analyze non
stationary signal. To overcome this, time frequency distributions (TFDs) shown in time frequency representation (TFR) with temporal and spectral is used. The verification using both methods on several disturbances 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 provide better time and frequency resolution than spectrogram. |
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