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Simple method for detecting phase sequence of three-phase industrial-frequency alternating current and detection device

A detection equipment, alternating current technology, applied in the direction of phase sequence/synchronization indication, etc., can solve the problems of increasing labor intensity, sampling part and complex phase calculation formula, and achieve the effect of small calculation amount, simple structure and simple system structure.

Inactive Publication Date: 2010-07-28
CHINA NON-FERROUS METALS PROCESSING TECH CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sampling part and phase calculation formula of this method are relatively complicated, which cannot be realized on an ordinary electronic electric pen, and can only be used for a special three-phase AC phase sequence measuring instrument, which increases the labor intensity of electrical installation and maintenance personnel.

Method used

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  • Simple method for detecting phase sequence of three-phase industrial-frequency alternating current and detection device
  • Simple method for detecting phase sequence of three-phase industrial-frequency alternating current and detection device
  • Simple method for detecting phase sequence of three-phase industrial-frequency alternating current and detection device

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Effect test

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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Abstract

The invention discloses a simple method for detecting the phase sequence of three-phase industrial-frequency alternating current and a detection device. In the invention, the zero-crossing rising edges of the three-phase voltage are respectively sampled, measured at a single point and compared by using the principle of phase time difference of the three-phase industrial-frequency alternating current, and the phase sequence and phase position of the three-phase industrial-frequency alternating current are judged by calculating the phase time difference. The method comprises the following steps: measuring the voltage rise zero-crossing point of any phase (defined as A) of the three-phase alternating current, and starting to calculate time with a clock by using the rising edge zero-crossing point of the Phase A as the reference point; then sequentially measuring the voltage rise zero-crossing points of the other two phases, and measuring the time differences T1 and T2 between the phase position rise zero-crossing point and the reference point of each of the two phases; and judging Phase B and Phase C through calculation. The method can measure three-phase industrial-frequency alternating current. The integrated multifunctional detection device has the advantages of miniaturization, systematization, simple structure and small calculated quantity, and can reduce the labor intensity of electrical installation and maintenance personnel.

Description

technical field [0001] The invention relates to the technical field of phase sequence measurement of three-phase power frequency alternating current, in particular to a simple three-phase power frequency alternating current phase sequence measurement method and detection equipment suitable for electrical construction and maintenance. Background technique [0002] At present, during electrical installations such as transformer installation, motor wiring, and maintenance, it is often necessary to measure the phase sequence of three-phase power frequency AC to ensure positive sequence operation or parallel operation with the same phase, and avoid major equipment operation accidents. The current commonly used phase sequence detection technology is to determine the sequence of the phases by simultaneously sampling the three-phase alternating current, comparing the rotating coordinate system and the stationary coordinate system and converting the phases. The sampling part and phas...

Claims

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Application Information

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IPC IPC(8): G01R29/18
Inventor 陶韬李利明
Owner CHINA NON-FERROUS METALS PROCESSING TECH CO LTD
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