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Method for measuring common-frequency periodic signal phase differences

A technology of periodic signal and measurement method, which is applied in the field of measurement and can solve the problems of unguaranteed measurement accuracy and difficulty.

Active Publication Date: 2013-08-21
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is difficult to determine the zero-crossing time, and the spatial interference is not completely irrelevant in the case of a fixed interference source, so the measurement accuracy cannot be guaranteed
The waveform conversion method is to convert the periodic signal into other waveforms such as triangle wave, sawtooth wave, and square wave, and then measure its phase difference. This method is a deformation of the zero-crossing detection method and has similar measurement drawbacks.

Method used

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  • Method for measuring common-frequency periodic signal phase differences
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  • Method for measuring common-frequency periodic signal phase differences

Examples

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Effect test

Embodiment 1

[0042] Embodiment 1: nuclear phase instrument

[0043] The phase nuclear instrument is used in the phase verification and phase sequence verification of power lines and substations, and has the functions of phase verification, phase sequence measurement and electric inspection.

[0044] The nuclear phase instrument is mainly composed of sensors, signal conditioning circuits, data acquisition circuits, CPU and corresponding analysis software. The sensor generally uses a voltage transformer to convert the high-voltage signals of the two high-voltage lines under test at a certain ratio; the signal conditioning circuit converts the voltage signal sent by the sensor into a voltage signal suitable for sampling by the acquisition circuit; the data acquisition circuit will condition The final signal is sampled, and then the analysis software is used to complete the analysis and judgment of the phase sequence and phase difference of the two high-voltage lines. The specific measurement...

Embodiment 2

[0050] Embodiment 2: MOA resistive current tester and MOA resistive current online monitoring device

[0051] Metal oxide surge arresters (hereinafter referred to as MOA) are widely used in power systems due to their superior overvoltage protection characteristics, but the aging of MOA resistors and thermal and impact damage will cause failures, which may lead to explosions and arrester breakdown It will also lead to a short circuit of the substation bus and affect the safe operation of the system. Therefore, strict and effective detection and regular preventive tests must be carried out on the running MOA. In the detection and test of zinc oxide arresters, the measurement of leakage current under AC operating voltage is an important item. The size of the resistive current fundamental wave component in the leakage current can more accurately reflect the dampness of the zinc oxide arrester and the aging of the valve plate. and internal insulation damage and other defects. Ther...

Embodiment 3

[0055] Embodiment 3: Dielectric loss current tester

[0056] The dielectric loss tester is a high-precision instrument for fully automatic measurement of the dielectric loss tangent and capacitance of various high-voltage power equipment in power plants and substations. Under the action of AC voltage, the dielectric will consume part of the electric energy, which will be converted into heat energy and lost. This energy loss is called dielectric loss. When an AC voltage is applied to the dielectric, there is a phase angle difference between the voltage and the current in the dielectric The complementary angle δ is called the dielectric loss angle, and the tangent tanδ of δ is called the dielectric loss tangent. The tanδ value is a parameter used to measure dielectric loss. The specific measurement process is as follows: (1) Synchronously sample the voltage signal V applied on the test piece and the current signal I flowing; (2) Apply harmonic analysis technology to obtain t...

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Abstract

The invention discloses a method for measuring common-frequency periodic signal phase differences. The method includes the steps of S1, carrying out synchronous sampling on W sample data of two common-frequency periodic signals to be measured in an evenly-spaced mode, S2, obtaining harmonic amplitude values A1k and A2k and harmonic phase angles of ml subharmonic and m2 subharmonic of the two common-frequency periodic signals to be measured, S3 computing initial phase angles of the two common-frequency periodic signals to be measured according to the harmonic amplitude values A1k and A2k and the harmonic phase angles, and S4, computing the phase differences according to the difference of the two initial phase angles and obtaining high-accuracy phase different measurement results. Thus, quality of instrument devices in the fields like electrical equipment condition monitoring, signal collecting and analysis, communication and automatic control can be achieved, wherein the instrument devices are based on the phase difference technology.

Description

technical field [0001] The invention relates to a measurement method, in particular to a measurement method for phase difference of periodic signals with the same frequency. Background technique [0002] The so-called periodic signal with the same frequency refers to the same frequency of the two periodic signals; the initial phase angle of the so-called periodic signal refers to f(t)=f(t+kT) for a periodic signal, wherein: k∈Z is an integer , T is the period. initial phase angle In the formula: t 0 is the zero-crossing point closest to the origin; the so-called phase difference refers to the difference between the initial phase angles of two periodic signals with the same frequency. [0003] Phase difference measurement is of great significance in the fields of power equipment status monitoring, signal acquisition and analysis, communication, and automatic control. Commonly used phase difference measurement methods include zero-crossing method, correlation analysis met...

Claims

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Application Information

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IPC IPC(8): G01R25/00
Inventor 傅中君周根元
Owner JIANGSU UNIV OF TECH
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