Remote asynchronous power frequency signal phase difference measurement method and system

A technology of power frequency signal and measurement method, which is applied to the phase angle between voltage and current, measurement device, and measurement of electrical variables, etc., which can solve problems such as complex engineering construction, long drag lines, and easy loss of signals, so as to avoid transmission Effects of distortion, improvement of effectiveness, and solution to construction inconvenience

Inactive Publication Date: 2015-09-23
JIANGSU UNIV OF TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In engineering applications, the two power frequency signals to be measured often have a long distance. For example, when measuring the dielectric loss angle of capacitive equipment and the resistive current of zinc oxide arrester, it is necessary to measure the voltage signal of the bus voltage transformer PT and the voltage signal of the passive transformer. The current signal of the measuring equipment is measured by the conventional method at this time, the towing line is long, the signal is easily lost and interfered, and the engineering construction is relatively complicated

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  • Remote asynchronous power frequency signal phase difference measurement method and system
  • Remote asynchronous power frequency signal phase difference measurement method and system

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Embodiment 1

[0019] Such as figure 1 As shown, a kind of remote asynchronous power frequency signal phase difference measuring method of the present invention comprises:

[0020] Step S1, obtaining the first and second phase differences, that is, obtaining the first phase difference between the first measured power frequency signal and the mains reference signal And the second phase difference between the second measured power frequency signal and the mains reference signal

[0021] Step S2, obtaining the phase difference of the first and second measured power frequency signals through the first and second phase differences which is

[0022] Specifically, the acquisition methods of the first and second phase differences are the same, that is, the N sampling data of the first measured power frequency signal and the mains reference signal are acquired by means of equal-interval synchronous sampling, and then the corresponding N sampling data The data are respectively obtained throug...

Embodiment 2

[0025] On the basis of Example 1, such as figure 2 As shown, the present invention also provides a long-range asynchronous power frequency signal phase difference measurement system, including: first and second dual-channel measurement units with the same circuit structure and function, the first and second dual-channel The measuring unit is adapted to obtain the first and second phase differences between the first and second measured power frequency signals and the mains reference signal respectively, and send the first and second phase differences to the main processor module to obtain the first and second phase differences 1. The phase difference of the second measured power frequency signal.

[0026] Specifically, the first dual-channel measurement unit includes: a channel CH1 sampling circuit suitable for connecting to the first measured power frequency signal, a channel CH1 signal conditioning circuit connected to the channel sampling circuit, and a channel CH1 signal c...

Embodiment 3

[0029] On the basis of Embodiment 1 and Embodiment 2, the method and system for measuring the phase difference of a remote asynchronous power frequency signal of the present invention will be described.

[0030] The channel CH1 sampling circuit of the first dual-channel measurement unit is connected to the first measured power frequency signal f 1 (t), the channel CH2 sampling circuit of the second dual-channel measurement unit is connected to the second measured power frequency signal f 2 (t), the measurement channels CH3 of the first and second dual-channel measurement units are connected to the 220v mains reference signal f 3 (t);

[0031] The first dual-channel measurement unit samples the first measured power frequency signal f synchronously at equal intervals 1 and mains reference signal f 3 N sampling data of the above N sampling data, and then use the harmonic analysis method to obtain the first measured power frequency signal f for the above N sampling data 1 (t) ...

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Abstract

The invention relates to a remote asynchronous power frequency signal phase difference measurement method and system. The power frequency signal phase difference measurement method comprises the steps that first phase difference between a first measured power frequency signal and a city power reference signal and second phase difference between a second measured power frequency signal and the city power reference signal are acquired, and phase difference between first and second measured power frequency signals is acquired through first and second phase difference. According to the invention, remote asynchronous phase difference measurement is realized; the problem of inconvenient tow wire construction, which is caused by long distance between two measured signals in engineering application, is solved; defects of long distance signal transmission distortion are avoided; the construction difficulty of the measurement system based on a phase difference technology in the fields of power device state monitoring, signal acquisition and analysis, communication, automatic control and the like is reduced; and the quality of the relevant measurement system and the effectiveness of state determination are improved.

Description

technical field [0001] The invention relates to a phase difference measurement method, in particular to a remote asynchronous power frequency signal phase difference measurement method and system. Background technique [0002] The so-called power frequency signal refers to the voltage / current periodic signal with a frequency of 50Hz or 60Hz. The so-called initial phase angle of a power frequency signal refers to a periodic signal f(t)=f(t+kT), wherein: k∈Z is an integer, T is a period; the initial phase angle In the formula: t 0 is the zero-crossing point closest to the origin; the so-called power frequency signal phase difference refers to the difference between the initial phase angles of two power frequency signals. [0003] The phase difference measurement of power frequency signal is widely used in many fields such as signal analysis, circuit parameter test, electrotechnical technology, power system and so on. Commonly used phase difference measurement methods can b...

Claims

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Application Information

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IPC IPC(8): G01R25/00
Inventor 傅中君王建宇欧云
Owner JIANGSU UNIV OF TECH
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