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    • 1. 发明公开
    • Apparatus and method employing an optical fiber for closed-loop feedback detection of arcing faults
    • 装置和方法,使用光纤,用于闭环反馈检测电弧故障
    • EP1538722A2
    • 2005-06-08
    • EP04028720.3
    • 2004-12-03
    • Eaton Corporation
    • Shea, John Joseph
    • H02H1/00H02B13/065
    • H02H1/0023
    • An apparatus detects arcing faults at a first wavelength. A light source provides modulated light at a second different wavelength and a first frequency. An optical fiber receives the modulated light and gathers ambient light at both wavelengths. A splitter receives and splits the received light into first and second beams. A first filter extracts from the first beam a first filtered beam including the first wavelength. A first photodetector generates a first electrical signal from the first filtered beam. A second filter extracts from the second beam a second filtered beam excluding the first wavelength. A second photodetector generates a second electrical signal from the second filtered beam. A low pass filter extracts from the second electrical signal a third electrical signal representative of light at the second wavelength excluding the modulated light. A comparator generates an arcing signal when the first electrical signal exceeds the third electrical signal.
    • 一种装置,检测第一波长的电弧故障。 光源以第二不同波长和第一频率提供调制的光。 光纤接收调制光和环境光在两个波长集。 一个分支接收并拆分接收到的光分成第一和第二光束。 第一滤波器从所述第一光束提取的第一过滤光束包括所述第一波长。 第一光电检测器基因费率从第一过滤光束的第一电信号。 第二过滤器从所述第二光束中提取不包括所述第一波长的第二光束过滤。 第二光电检测器基因价格从第二滤波的光束的第二电信号。 低通滤波器从所述第二电信号中提取第三电代表的信号光的所述第二波长不包括调制的光。 比较器产生当第一电信号超过第三电信号电弧信号的速率。