Fault arc detection method based on high frequency characteristic and apparatus thereof
A technology of fault arc and detection device, which is applied in the direction of testing dielectric strength, etc., can solve problems such as increasing circuit complexity, achieve the effects of reducing sampling rate and algorithm complexity, high sensitivity, and improving detection probability
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[0079] In this embodiment, the fault arc detection device is installed in a 220V / 50Hz AC power grid. It only needs to configure filter software and hardware parameters, and it can be installed in a 110V / 60Hz AC power grid, and can also detect DC fault arcs.
[0080] The hardware system flow chart of this embodiment is as follows Figure 6 As shown, a capacitor is incorporated at the input end to reduce the interference of its upstream branch. In this embodiment, the capacitor incorporated into the input terminal is selected as a safety capacitor, the broadband current transformer is selected as a Hall current transformer, and the filtering part in the current filtering and shaping module is composed of 2 high-pass filters and 2 low-pass filters, such as Figure 4 , its parameters are as follows: N1=1, N2=1, M1=2, M2=3; G11=G12=20G11=G12=20, G21=G22=5; R3=100Ω, R4=5kΩ in the hysteresis comparison circuit .
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