Open-phase detection device for digital three-phase alternating-current phase sequence and detection method thereof

Abstract

The invention discloses an open-phase detection device for a digital three-phase alternating-current phase sequence, which comprises a three-phase alternating voltage wave rectifying circuit, a digital signal processor and an output port, wherein the digital signal processor comprises a square wave rising edge capture module, a power supply phase sequence detection module and a power supply open-phase detection module. The invention also discloses a detection method of the open-phase detection device for the digital three-phase alternating-current phase sequence. In the device and the method,the three-phase alternating current is subjected to digital conversion and a digital logic analytical TAB table of positive and negative phase sequences of a three-phase alternating-current power supply is inquired so as to obtain the direction of the current three-phase alternating-current phase sequence directly and judge whether open phase occurs or not.

Description

technical field [0001] The invention relates to the fields of three-phase AC power supply detection and motor phase sequence control, in particular to a digital three-phase AC phase sequence lack of phase detection device and detection method. Background technique [0002] With the popularization and application of inverters, in places where there are many market applications, inverters are used to switch to industrial frequency power when they run to 50HZ. In this case, phase sequence reversal is absolutely not allowed. Once a phase sequence error occurs , will cause a huge inrush current, cause the motor to fail, or even be damaged. , such as lifting cranes, machine tools, elevators, escalators, etc. So reliable three-phase power phase sequence detection is very necessary. [0003] At present, the two main methods used to solve the phase sequence detection problem of three-phase power supply are as follows: [0004] 1. The hardware measurement method uses the principle ...

AI Technical Summary

Problems solved by technology

It can be seen that in the three cases of a, b, and c, the processor needs to sample a large number of discrete analog quantities, and use complex mathematical algorithms to indirectly calculate the phase sequence direction of the three-phase AC, which has a large amount of data processing, is prone to errors, and has a great impact on the processor. Disadvantages such as high requirements and very complicated implementation process

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