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A Broadband AC and DC Current Measuring Device

A current measuring device, AC and DC technology, applied in the direction of measuring devices, electrical measuring instrument components, measuring electricity, etc., can solve the problems that the measurement error of high and low frequency AC and DC current cannot be taken into account at the same time, so as to improve the accuracy and widen the current Measuring Bandwidth Effects

Active Publication Date: 2022-05-03
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of this application is to provide a wide-band AC / DC current measuring device, which is used to solve the technical problem that the existing technology cannot simultaneously measure high and low frequency AC / DC currents and has large measurement errors when measuring AC / DC currents.

Method used

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  • A Broadband AC and DC Current Measuring Device
  • A Broadband AC and DC Current Measuring Device
  • A Broadband AC and DC Current Measuring Device

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Embodiment Construction

[0024] The technical solutions of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0025] In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a sp...

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Abstract

This application discloses a wide-band AC / DC current measuring device, which includes two iron core frames, a non-magnetic frame, four windings and an attached compensation circuit; it combines a dual-core structure self-excited oscillation fluxgate sensor and Rogowski coil current sensor structure, with DC magnetic flux compensation circuit, can complete AC current detection, can also complete DC current detection, use double core structure fluxgate current sensor to measure low frequency current, use Rogowski coil current sensor to measure power frequency current , which greatly widens the current measurement bandwidth, and the detection accuracy of the AC current containing the DC component is better than that of the electromagnetic current sensor. At the same time, when measuring low-frequency current, the accuracy of low-frequency current measurement can be effectively improved by means of DC magnetic potential compensation and adjusting the excitation frequency. Therefore, it solves the technical problem that in the prior art, when measuring the AC and DC currents, the measurement of the AC and DC currents with high and low frequencies cannot be taken into account at the same time, and the measurement error is relatively large.

Description

technical field [0001] The present application relates to the technical field of electric power detection, and in particular to a broadband AC and DC current measuring device. Background technique [0002] In recent years, with the development of AC and DC distribution networks, especially the increasing non-linear loads in AC grids, DC components appear in AC grids. There are more and more scenarios for simultaneous measurement of AC and DC current, including AC and DC detection inside electric vehicle charging piles, half-wave current detection devices, and so on. The current detection range is not limited to the original power frequency current, but extended to low frequency current and DC component. Therefore, the accurate measurement of broadband AC and DC becomes one of the hot spots again. [0003] Traditional current measuring devices such as electromagnetic current transformers (ICT), etc., due to the influence of constant DC on the primary side, the working state...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00G01R15/20G01R1/30
CPCG01R19/0092G01R15/20G01R1/30
Inventor 宋宏天王保帅胡珊珊尹家悦
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD