A system for relatively accurate resistive current measurement based on Fourier FFT forward and reverse transform using circuit energy

Abstract

The invention relates to a system for relatively accurate resistive current measurement based on Fourier FFT forward and reverse transform using circuit energy, including an energy harvesting device and a device for relatively accurate resistive current measurement based on Fourier FFT forward and reverse transform, to solve It solves the power supply problem under the condition of satisfying the existing data monitoring, and is an online monitoring device of the arrester which can support the realization of the DSP as the controller under the leakage current of the microampere level.

Description

technical field [0001] The invention belongs to the field of power grid monitoring, in particular to the field of lightning arrester monitoring systems. Background technique [0002] The existing arrester monitoring system uses PT to monitor the current flowing through the arrester, but this method can no longer adapt to the current situation that the existing intelligent station, substation power transmission system, and high-speed rail power have nowhere to set PT. To solve the above problems, The invention adopts a method for measuring resistive current based on Fourier FFT positive and negative transformation relative calibration and a corresponding device to solve the measurement problem of the lightning arrester. [0003] With the development of the power grid, efficient and accurate real-time monitoring has always been the key to the online monitoring system of lightning arresters. However, the existing monitoring equipment, such as traditional analog meters, has accu...

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Problems solved by technology

[0002] The existing arrester monitoring system uses PT to monitor the current flowing through the arrester, and this method can no longer adapt to the current situation that the existing intelligent station, substation power transmission system, and high-speed rail power have no place to install PT. In order to solve the above problems, The present invention adopts the method and corresponding device based on Fourier FFT positive and negative transformation relative calibration resistive current measurement to solve the problem of lightning arrester measurement

[0003] With the development of the power grid, efficient and accurate real-time monitoring has always been the key to the online monitoring system of lightning arresters. However, the existing monitoring equipment, such as traditional analog meters, has accuracy, can only monitor the full current and cannot be transmitted remotely, and has long-term consistency in harsh environments. The existing electronic detection devices have power supply and transmission problems. The power supply mostly adopts external power supply or battery power supply, and there are problems such as engineering or battery life. The transmission mostly uses wired, wireless, and traditional optical fiber communication methods. There is a risk of introducing high voltage for wired, and there is a stability problem for wireless in substations. Traditional optical fiber communication requires a large Life, and the arrester is running outdoors, the temperature difference changes greatly, different regions and different seasons will have a certain impact on the battery, increase the failure rate of the arrester monitoring equipment, generally DSP is a high-end controller, and has relatively large power consumption requirements

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