Open-phase detecting method of three-phase transformer
A three-phase converter, power supply phase loss technology, applied in multi-phase network asymmetric measurement, instruments, electrical components and other directions, can solve the problems of complex hardware structure, increased cost, increased CPU load, etc., to reduce the number of IRQs, The effect of reducing the possibility and reducing the load on the CPU
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[0065] Fig. 1 is an embodiment of a three-phase converter applying the method of the present invention. Figure 2 is the AD input voltage when it is normal, Figure 3 is the AD input voltage when the T phase is open, Figure 4 is the power supply voltage when it is normal, Figure 5 is the power supply voltage when the T phase is open, and Figure 6 is the normal time Line voltage, Figure 7 is the line voltage when the T phase is open, Figure 8 is the DC bus N terminal voltage when it is normal, and Figure 9 is the DC bus N terminal voltage when the T phase is open.
[0066]In FIG. 1, 1 is a three-phase AC power supply, 2 is a first resistor for dividing r-phase voltage, and 5 is a second resistor for dividing r-phase voltage. The s-phase and t-phase are the same as the r-phase, respectively having the first resistor 3 and the second resistor 6 for dividing the voltage of the s-phase and the first resistor 4 and the second resistor 7 for dividing the voltage of the t-phase. 8-10 ar...
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