直流输电线路行波采集二次回路阻抗匹配问题研究

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Abstract Accurate acquisition of traveling wave signals is the foundation of traveling wave fault location (TWFL) for transmission lines, and the impedance mismatch of the secondary circuit of high voltage direct current (HVDC) lines has negative impact on traveling wave acquisition. For this issue, this article investigates the reasons of the impedance mismatch in the secondary circuit, and analyzes the resulted phenomenon of traveling wave refraction and reflection (TWRR), as well as its negative impact on single-ended TWFL. To solve the problem, a method of impedance matching is proposed, which adds a parallel resistor at the head end of the transmission cable. The commonly used transmission cable is measured and simulated to analyze the range of wave impedance change of the transmission cable, and to verify the suppression effect of TWRR by matching resistors. The results show that the proposed impedance matching method can effectively eliminate the phenomenon of TWRR on secondary circuit, thus improve the reliability of single-ended TWFL, and has good engineering adaptability.

Key words： HVDC transmission line secondary circuit impedance matching traveling wave refraction and reflection (TWRR) traveling wave fault location (TWFL)

Received: 19 May 2023

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	Articles by authors
	CHEN Yulin
	ZHANG Jie
	ZHANG Jianfeng
	LI Haitao

Cite this article:

CHEN Yulin,ZHANG Jie,ZHANG Jianfeng等. Research on impedance matching of secondary circuit of HVDC transmission lines for travelling wave acquisition[J]. Electrical Engineering, 2023, 24(8): 50-55.

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http://dqjs.cesmedia.cn/EN/Y2023/V24/I8/50

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