Method and device for phase lack detection of three-phase circuit
A phase loss detection, three-phase circuit technology, applied in the direction of multi-phase network asymmetric measurement, etc., can solve problems such as increasing cost, increasing external hardware, increasing equipment maintenance complexity, etc., and achieves the effect of reducing equipment cost and simplifying operation and maintenance.
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[0023] The technical solution of the present invention will be further elaborated below in conjunction with the drawings and specific embodiments.
[0024] figure 1 It is a schematic flow chart of the method for implementing the phase lack detection of a three-phase circuit of the present invention, and the method includes:
[0025] Step 101: Sampling the instantaneous value of the three-phase AC voltage to obtain the three-phase coordinates.
[0026] Depending on the sampling circuit, the instantaneous value of the sampled three-phase AC voltage can be the instantaneous value of the phase voltage or the instantaneous value of the line voltage. From the relationship between line voltage and phase voltage:
[0027]
[0028] It can be seen that the line voltage is proportional to the phase voltage, and the two can be converted to each other through simple calculations.
[0029] If the instantaneous value of the phase voltage is collected as V a , V b , V c , You can change V a ,...
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