Broadband AC/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 of not taking into account the measurement error of high and low frequency AC and DC current at the same time, so as to improve the accuracy and widen the current Measuring Bandwidth Effects

Active Publication Date: 2021-06-18
CHINA SOUTH POWER GRID ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Broadband AC/DC current measuring device
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  • Broadband AC/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, use a spec...

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Abstract

The invention discloses a broadband AC / DC current measuring device, which comprises two iron core frameworks, a non-magnetic framework, four windings and an affiliated compensation circuit, a double-iron-core structure self-oscillation fluxgate sensor and a Rogowski coil current sensor structure are combined, a direct current magnetic flux compensation circuit is matched, alternating current detection can be completed, direct current detection can also be completed, and the double-iron-core structure fluxgate method current sensor is used for measuring low-frequency current. The Rogowski coil current sensor is used for measuring the power frequency current, the current measurement bandwidth is greatly widened, and the detection precision of the alternating current containing the direct current component is superior to that of an electromagnetic current sensor. Meanwhile, when the low-frequency current is measured, the measurement precision of the low-frequency current can be effectively improved through a direct-current magnetic potential compensation and excitation frequency adjustment method. Therefore, the technical problems that when alternating current and direct current are measured in the prior art, high-frequency and low-frequency alternating current and direct current measurement cannot be considered at the same time, and the measurement error is large are solved.

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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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 CHINA SOUTH POWER GRID ELECTRIC POWER RES INST
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