Method and system for detecting SAG signal in DVR device
A signal and sampling point technology, applied in the direction of measuring devices, measuring electrical variables, measuring current/voltage, etc., can solve problems such as large amount of calculation and delay in detection time, and achieve the effect of reducing time delay and saving calculation time
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[0030] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.
[0031] like figure 1 As shown, it is a method for detecting a SAG signal in a DVR device provided by an embodiment of the present invention, and the method includes:
[0032] Step S101, according to the preset sampling frequency and the power frequency period, obtain the same number of sampling points of the power grid signal in each power frequency period, and set a circular buffer with a length equal to the number of the sampling points;
[0033] The specific process is that the sampling frequency of the power grid signal can be set to 6.4KHz, the power frequency period is set to 20ms, or the sampling frequency can be set to 12.8KHz, and the power frequency period is set to 20ms and other special values, so that the sampling within 20ms of each power frequency p
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