Method and device for indirectly measuring large DC based on AC detection

A technology of AC detection and AC current, applied in the direction of measuring devices, measuring current/voltage, measuring electrical variables, etc., can solve the problems of low measurement accuracy and bulky DC large current measuring devices, and achieve easy and accurate calibration and good linearity degree, not easy to saturate the effect

Inactive Publication Date: 2011-06-01
HUNAN UNIV +2
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Problems solved by technology

[0003] In order to solve the technical problems of large volume and low measurement accuracy of the existing DC large current measuring device, the present invention provides a DC large current indirect measuring device based on AC detection with simple structure and low cost

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  • Method and device for indirectly measuring large DC based on AC detection
  • Method and device for indirectly measuring large DC based on AC detection
  • Method and device for indirectly measuring large DC based on AC detection

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Embodiment Construction

[0015] A method for indirect measurement of direct current large current based on alternating current detection, comprising the following steps:

[0016] 1) The AC current sensor collects multiple current signals on the valve side of the rectifier transformer;

[0017] 2) The acquisition unit performs synchronous sampling on the current signal collected by the AC current sensor, and the sampled data is stored in the acquisition unit;

[0018] 3) Transfer the sampling data to the PC through the interface;

[0019] 4) The PC performs real-time analysis and processing on the received data, realizes real-time calculation of DC current and real-time display of waveform, and simultaneously realizes AC current measurement and harmonic analysis on the valve side.

[0020] The device that realizes the indirect measurement of DC large current based on AC detection, such as figure 1 shown. In the figure, 1 is an AC current sensor, 2 is a multi-channel acquisition unit, 3 is a PC, 4 is...

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Abstract

The invention discloses a method and device for indirectly measuring large DC based on AC detection. The method comprises the following steps: 1) acquiring multichannel current signals of rectifier transformer valve sides by adopting AC sensors; 2) synchronously sampling the current signals acquired by the AC sensors through adopting acquiring units; 3) transferring the sampled data to a PC machine via interfaces; and 4) analyzing the received data in real time by adopting the PC machine to compute the measured DC. The method and the device have the following beneficial effects: the structure is simple; the volume is small; the measuring process is not affected by the DC high-intensity magnetic fields; the operation is convenient; the measuring accuracy is high; tens of thousands of amperes of large DC can be accurately measured; and the problems of DC measurement, AC harmonic analysis and energy consumption analysis and efficiency calculation of rectifier cabinets and converter systems in the industries such as electrolysis chemical industry and the like are effectively solved.

Description

technical field [0001] The invention relates to a method for measuring direct current, in particular to a method and device for indirect measurement of large direct current based on alternating current detection. Background technique [0002] With the development of modern industry in the direction of scale, the capacity of the converter system used in DC transmission, chemical industry, metallurgy and other industries is increasing, and the DC current is also increasing, especially in some electrolysis industries. It can be as high as hundreds of thousands of amperes, and the accurate measurement of DC large current has always been one of the technical problems that have not been effectively solved, and it is also directly related to the accuracy and reliability of the efficiency calculation of transformers, converters and other components. At present, the measurement methods for large DC currents are mainly divided into two categories: one is to calculate the DC current ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00
Inventor 罗隆福宁志毫张志文许加柱
Owner HUNAN UNIV
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