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High-speed sampling method and system suitable for diagnosing terminal

A high-speed sampling and current sampling technology, applied in the field of power systems, can solve the problems of unfavorable high-frequency and large current detection, poor frequency characteristics, and inability to collect high-frequency currents in real time with high precision, achieving good linearity, light structure, The effect of easy installation

Inactive Publication Date: 2019-04-05
NARI TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the problems of large current saturation and other problems, the traditional electromagnetic CT has poor frequency characteristics, which is not conducive to the detection of high frequency and large current.
In addition, traditional power systems and industrial control devices mostly use sampling loops with a sampling rate lower than 1 MSPS. This sampling method cannot collect high-frequency currents in real time and with high precision.

Method used

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  • High-speed sampling method and system suitable for diagnosing terminal
  • High-speed sampling method and system suitable for diagnosing terminal
  • High-speed sampling method and system suitable for diagnosing terminal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A high-speed sampling method suitable for diagnostic terminals, including:

[0037] Obtain the sampling current value of the line;

[0038] Integrate the sampled current value to obtain a current waveform signal with the same phase as the sampled current value;

[0039] Perform high-pass filtering on the current waveform signal to obtain the filtered current waveform signal, which is used to reduce the gain of the low-frequency signal;

[0040] The differential operational amplifier module performs differential conversion processing on the filtered current waveform signal to obtain a current differential signal; changes the sampling signal from a single-ended signal to a differential signal;

[0041] The analog-to-digital conversion module performs analog-to-digital conversion processing on the current differential signal to obtain a current differential digital signal.

[0042] Further, the described high-speed sampling method also includes:

[0043] The current dif...

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Abstract

The invention discloses a high-speed sampling method and system suitable for diagnosing a terminal. A double Rogowski coil and a double ADC sampling circuit are adopted, a current with the bandwidth of several kilohertz to several megahertz and the measuring wide range of several amperes to several kiloampere is measured by using the Rogowski coil. The structure of the Rogowski coil is light and small, installation is convenient, a conductor is not damaged and no direct electric connection of the conductor with a measured loop exists, the influence on a primary side current signal is little, magnetic materials do not contain, saturation phenomenon cannot occur, and the linearity is good. The precision of sampling total range is ensured by arranging FPGA program in different current rangesfor starting different sampling channels.

Description

technical field [0001] The invention belongs to the technical field of power systems, and in particular relates to a high-speed sampling method and system suitable for diagnosis terminals. Background technique [0002] The transient current in the power grid contains a large amount of fault information, and at the same time puts forward higher requirements for the measurement bandwidth, speed and measurement accuracy of the instrument; it has a suitable sensitivity range and can cover high-frequency signals from power frequency to megahertz Large-bandwidth detection equipment can reproduce the fault current more completely, which is of great significance to the fault diagnosis and prevention of the power system. Not only can it help to repair faulty lines in time, but also can save a lot of manpower and material resources for line inspection, ensure the safe and stable operation of the entire power grid, and have huge social and economic benefits. [0003] In some applicati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25G01R15/18
CPCG01R15/181G01R19/2509
Inventor 郑玉平邓庆周华良姚吉文王海全张吉
Owner NARI TECH CO LTD