1. Partial discharge characteristics of oil-paper insulation for on-board traction transformers under superposed inter-harmonic AC voltages.
- Author
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Li, Xiaonan, Wu, Guangning, Yang, Yan, Wang, Zijie, Xu, Ping, Li, Yixuan, and Gao, Bo
- Subjects
- *
PARTIAL discharges , *ELECTRIC potential , *BREAKDOWN voltage , *HIGH voltages - Abstract
Oil-paper insulation of higher voltage winding and traction winding in on-board traction transformers frequently withstand large AC fluctuation voltages mainly combined with AC and inter-harmonic components. This paper presents the characteristics of partial discharge (PD) of oil-paper insulation under superimposed inter-harmonic AC voltages. The experimental results show that the addition of the inter-harmonic to the fundamental sinusoidal component results in variation of peak voltage and dv/dt along the phase. This superimposed inter-harmonic AC voltages has a significant impact on PD including partial discharge inception voltage (PDIV), breakdown voltage, PD repetition rate, and phase resolved partial discharge (PRPD). In addition, a dynamic characterization method of PD statistical parameters is proposed to determine the developing trend. The critical values and inflection points of PD are obtained. Besides, the theoretical mechanism is expounded to better interpret and understand the influence of inter-harmonic component on PD properties. These methods will provide the dynamic datasets and more information for insulation condition assessment of on-board traction transformer. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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