基于接收信号强度功率和最大似然估计的特高频局部放电测向方法

doi:10.19595/j.cnki.1000-6753.tces.190680

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Abstract Partial discharge is one of the main reasons of electrical equipment insulation deterioration in substations. The detection and localization of partial discharge (PD) using ultra-high frequency (UHF) antennas is an important means for equipment fault warning in substations. UHF PD localization system is usually based on time-difference of electromagnetic wave signal. However, this system requires high sampling rate and time synchronization accuracy, which has high cost. This paper studied the feasibility and accuracy of PD direction of arrival (DoA) using power of UHF received signal strength indicator (RSSI) and maximum likelihood (ML) estimation. First, the UHF antenna power pattern was achieved in the offline experiment. Then, a method using maximum likelihood estimator was proposed to handle PD direction of arrival estimation and obtain the preliminary orientation results. Last, in order to obtain the final results, interpolation and clustering were employed to improve the resolution. In a laboratory test, the experimental results show that the average error of direction of arrival is less than 7°, and the cost is lower and the use is more convenient.

Key words： Substation partial discharge received signal strength indicator maximum likelihood estimator direction of arrival

Received: 04 June 2019

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TM835

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	Wu Fan
	Luo Lingen
	Wang Hui
	Sheng Gehao
	Jiang Xiuchen

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Wu Fan,Luo Lingen,Wang Hui等. RSSI-Power-Based Direction of Arrival Estimation Using Maximum Likelihood Estimator and Antenna Array[J]. Transactions of China Electrotechnical Society, 2020, 35(12): 2689-2697.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.190680 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I12/2689

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