| 摘要 |
A method for arc detection includes detecting a changing rate of a signal indicative of light strength, detecting the amplitude of the signal, and indicating an occurrence of an arc if the changing rate of the signal exceeds a first predetermined threshold and the amplitude of the signal exceeds a second predetermined threshold. An arc detecting device, an arc detecting system, and an arc protecting apparatus thereof are provided. The arc detecting system includes a light collector (101) for collecting light, a light converter (103) coupled to the light collector (101) for converting the collected light into an electric signal, and an arc detecting device (106) coupled to the light converter (103) for detecting the occurrence of the arc. The arc detecting device (106) comprises a slope criterion module configured to determine if the changing rate of the signal indicative of the light strength exceeds the first predetermined threshold and an absolute value criterion module configured to determine if the amplitude of the signal exceeds the second predetermined threshold. |
