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Energies 2017, 10(10), 1556; doi:10.3390/en10101556

Influences of Traction Load Shock on Artificial Partial Discharge Faults within Traction Transformer—Experimental Test for Pattern Recognition

School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
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Received: 19 July 2017 / Revised: 2 September 2017 / Accepted: 25 September 2017 / Published: 10 October 2017
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Abstract

Partial discharge (PD) measurement and its pattern recognition are vital to fault diagnosis of transformers, especially to those traction substation transformers undergoing repetitive traction load shocks. This paper presents the primary factors induced by traction load shocks including high total harmonics distortion (THD), transient voltage impulse and high-temperature rise, and their effects on the feature parameters of PD. Experimental tests are conducted on six artificial PD models with these factors introduced one by one. Results reveal that the maximum PD quantity and the PD repetitive rate are favorable to be enlarged when the oil temperature exceeds 80 °C or the THD is higher than 16% with certain orders of harmonic. The decline in PD inception voltage can mainly be attributed to the transient voltage impulse. The variation in central frequency of the fast Fourier transformation (FFT) spectra transformed from ultra-high frequency signals can mainly be attributed to high THD, especially when it exceeds 20%. The temperature rise has no significant influence on the FFT spectra; the transient voltage impulse, however, can result in a central frequency shift of the floating particle discharge. With the rapid development of high-speed railways, the study presented in this paper will be helpful for field PD detection and recognition of traction substation transformers in the future. View Full-Text
Keywords: traction substation transformer; traction load shock; total harmonic distortion; transient impulse voltage; temperature rise; partial discharge traction substation transformer; traction load shock; total harmonic distortion; transient impulse voltage; temperature rise; partial discharge
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MDPI and ACS Style

Li, S.; Gao, G.; Hu, G.; Gao, B.; Yin, H.; Wei, W.; Wu, G. Influences of Traction Load Shock on Artificial Partial Discharge Faults within Traction Transformer—Experimental Test for Pattern Recognition. Energies 2017, 10, 1556.

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