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| Characterization and Measurement Method of DC Arc Electromagnetic Radiation for Photovoltaic Systems |
| Wang Yao1,2, Zhang Yanfeng1,2, Niu Feng1,2,3, Zhao Shuangle1,2,4, Li Kui1,2 |
1. State Key Laboratory of Reliability and Intelligence of Electrical EquipmentHebei University of Technology Tianjin 300130 China;
2. Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology Tianjin 300130 China;
3. College of Electrical Engineering Zhejiang University Hangzhou 310027 China ;
4. Applied Liberal and College Tianjin University of Science and TechnologyTianjin 300222 China |
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Abstract DC arcing fault is an important factor threatening the safe operation of photovoltaic (PV) system due to the lack of current zero crossing. In this paper, the characteristics and measurement methods of electromagnetic radiation emitted from DC arcs are studied, and the feasibility of arcing fault detection and location by using such electromagnetic radiation signals is investigated. The DC arcing electromagnetic radiation comprises a series of discontinuous impulse sequences in the time domain, the pulse start time corresponding to the sudden change of arcing current. Consequently, the electromagnetic radiation intensity is proportional to the current derivation. In addition, each single impulse appears as a damped oscillation signal, which determines the frequency spectrum of the radiation signal. Accordingly, a three-order Hilbert fractal antenna with a bandwidth of 210~800MHz is designed. It is verified that both the frequency bandwidth and the frequency at maximum point of spectrum agree with the theoretical analysis. Finally, the effects of current derivation and distance from arcing point on arcing fault detection are analyzed, which is helpful to the arcing fault detection and location.
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Received: 24 April 2018
Published: 29 July 2019
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2019, Vol. 34 
