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Simple and easy phase sequence test method of three-phase alternating current

A test method, AC technology, applied in the direction of phase sequence/synchronization indication, etc., can solve the problems of large volume, increased load, complex sampling part and phase calculation formula

Inactive Publication Date: 2013-02-27
CHINA NON-FERROUS METALS PROCESSING TECH CO LTD
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Problems solved by technology

The sampling part and phase calculation formula of this method are relatively complicated, the cost is high and the volume is large, and it can only be used for a special three-phase AC phase sequence measuring instrument, which increases the load for electrical installation and maintenance personnel

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  • Simple and easy phase sequence test method of three-phase alternating current
  • Simple and easy phase sequence test method of three-phase alternating current
  • Simple and easy phase sequence test method of three-phase alternating current

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Embodiment Construction

[0023] like figure 1 , 2 , 3, 4, and 5, a simple three-phase power-frequency AC phase sequence test method, which converts the AC phase sequence diagram (i.e. voltage-time diagram) after half-wave rectification into a timing diagram (electrical current diagram) in a digital circuit flat-time graph). Then, the three-phase electrical phase sequence is detected through the identification circuit, and the specific steps are as follows:

[0024] 1. Take the single-point sampling digital signal of the power frequency AC three-phase A, B, C, reduce the high voltage of the three-phase A, B, C of the power frequency AC to a low voltage through the step-down device, and then reduce the low voltage power frequency AC The three-phase A, B, C are converted into pulsating DC voltage through the half-wave rectification device;

[0025] 2. Sequentially process the half-wave rectified alternating current, convert the pulsating direct current voltage through the electric-optical-electricity ...

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Abstract

The invention relates to the technical field of phase sequence test of three-phase alternating current, and discloses a simple and easy phase sequence test method of the three-phase power frequency alternating current. The method comprises the following steps: taking pulsatory direct current voltage signals of three phases A, B and C of the power frequency alternating current, performing timing sequence processing, converting the pulsatory direct current voltage into power single-point sampling digital signals at A, B and C time sequences in each period through a photoelectric isolation device; and judging phase sequences of three-phase current A, B and C through an identification circuit time sequence trigger, when the square wave digital signals accessed into the three phases A, B and C are in a positive sequence, an LED (light-emitting diode) is normally on, and when in a negative sequence, the LED is normally off. According to the invention, the three-phase current half wave can be shaped to be standard triggering level; the method can further facilitate phase sequence indication, messed sequence protection and missing sequence protection; and at the same time, the method can be used for testing the three-phase power at different frequencies.

Description

technical field [0001] The invention relates to the technical field of three-phase alternating current phase sequence testing, in particular to a simple three-phase alternating current phase sequence testing method capable of testing three-phase electric phases of different frequencies. Background technique [0002] At present, my country's production and distribution are all three-phase alternating current. The phase sequence of the three-phase alternating current is relative, and any phase can be determined first as A, the phase that is 120° behind the A phase is the B phase, and the phase that is 240° behind the A phase and 120° ahead of the A phase is the C phase. Three-phase alternating current is a power system composed of three alternating current circuits with the same frequency, equal potential amplitude, and 120° phase difference. [0003] During electrical installations such as transformer installation, motor wiring, and maintenance, it is often necessary to meas...

Claims

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Application Information

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IPC IPC(8): G01R29/18
Inventor 李利明朱忠民谢艳红陶韬祝鑫
Owner CHINA NON-FERROUS METALS PROCESSING TECH CO LTD
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