Three-phase alternating-current phase sequence detecting method and device thereof

Abstract

The invention belongs to the technical field of electrics and relates to a three-phase alternating-current phase sequence detecting method and device thereof. The invention solves the technical problems of complicated phase sequence judging process, complicated judging circuit, high cost and the like of the prior art. The detecting method comprises the following detecting processes of: a, signal collection; b, signal processing; and c, phase sequence judging. The detecting device comprises an A phase sampling unit, a B phase sampling unit, a C phase sampling unit, a processor, a sequencing unit, a judging unit, an A phase sampling unit, a B phase sampling unit, a C phase sampling unit, an analog / digital converter and the like, wherein the A phase sampling unit, the B phase sampling unit and the C phase sampling unit are connected on three-phase electrical equipment or a three-phase alternating-current power supply to be used for collecting each phase of electrical signal. The invention has the advantages that a power grid cycle can reflect phase sequence states in real time at any moment, the phase sequence judging is timely and effective, and the electricity safety is improved; when the detecting device is applied to the field of digital control, a peripheral hardware judging circuit is effectively simplified; and the phase sequence detecting method is simple and practical and the detecting device has strong capacity of resisting disturbance.

Description

technical field [0001] The invention belongs to the technical field of electricity and relates to three-phase alternating current, in particular to a method and a device for detecting phase sequence of three-phase alternating current. Background technique [0002] In the application field of three-phase electrical equipment, the phase sequence of the three-phase AC has an important impact on the normal operation of the electrical equipment, and in many cases, the reverse power supply phase sequence is not allowed. Take three-phase AC-driven power transmission equipment as an example, such as hoisting equipment such as cranes, elevators, etc. AC motor-driven equipment controls the running direction of the transmission equipment by changing the phase sequence of the motor supply voltage. In normal operation, once the phase sequence is reversed, the running direction will also change. Therefore, phase sequence detection must be introduced in the control of transmission equipmen...

AI Technical Summary

Problems solved by technology

[0005] Although the above scheme realizes phase sequence detection, there are still technical problems such as complicated judgment process, complicated judgment circuit and high cost.

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