A simple three-phase power frequency AC phase sequence measurement method and detection equipment
A detection equipment, alternating current technology, applied in the direction of phase sequence/synchronization indication, etc., can solve the problems of complex sampling part and phase calculation formula, increase labor intensity, etc., to achieve the effect of simple structure, small calculation amount, and simple system structure
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Embodiment approach 1
[0033] Such as figure 1 , 2 , shown in 3: a simple three-phase power frequency AC phase sequence measurement method is to use the phase time difference principle of three-phase power frequency AC, separately sample the zero-crossing rising edge of the three-phase voltage, single-point measurement and comparison, through The calculation of the phase time difference is to judge the phase sequence and phase of the three-phase power frequency alternating current; the method is as follows:
[0034] First measure the zero-crossing point of the voltage rise of any phase of the three-phase alternating current; use this phase as phase A, and use the zero-crossing point of the rising edge of this phase as the reference point, and start to use the clock to calculate the time; then measure the zero-crossing point of the voltage rise of the other two phases in turn, Measure the time difference T1 and T2 between the zero-crossing point and the reference point of the other two phases; calcu...
Embodiment approach 2
[0043] Such as figure 2 , 4 , shown in 5: a simple three-phase power frequency AC phase sequence measurement method, not only applicable to power frequency voltage, but also suitable for voltage phase detection of known phase number and frequency grid; for known phase number n and frequency f The grid voltage phase of , and its corresponding single-cycle phase time difference is Integer multiples of , the first phase is OS, the second phase is The third phase is And so on; when calculating the phase time difference in any time period, it can be calculated according to the following formula:
[0044]
[0045] T----------measurement time difference (S);
[0046] t----------Phase time difference (S).
[0047] When using the single voltage rising edge zero-crossing sampling mode, set the voltage phase of the first sampling as phase A. Although a period of time has passed during the second sampling, the time must be an integer multiple of 20ms plus a single-cycle phase ...
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