Air core coil mutual inductance coefficient error elimination method and application based on rotation cancellation principle

A mutual inductance coefficient and error elimination technology, applied in the direction of instruments, measuring devices, measuring electrical variables, etc., can solve problems such as inaccurate calibration results and achieve the effect of improving the accuracy level

Active Publication Date: 2017-04-05
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0008] In view of the above-mentioned defects, the present invention provides an air-core coil mutual inductance error elimination method based on the principle of rotation cancellation, aiming to solve the problems in the prior art due to the incorrect structure of the air-core coil and the shape

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  • Air core coil mutual inductance coefficient error elimination method and application based on rotation cancellation principle
  • Air core coil mutual inductance coefficient error elimination method and application based on rotation cancellation principle
  • Air core coil mutual inductance coefficient error elimination method and application based on rotation cancellation principle

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[0037] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.

[0038] Such as figure 1 As shown, the method for eliminating the mutual inductance error of the air-core coil based on the principle of rotation cancellation provided by the present invention and the device used in the method for measuring current using the air-core coil include the turntable 1, the air-core coil 2 and the current-carrying conductor 3. The coil 2 is tightly fixed on the turntable 1. The turntable 1 can rotate uniformly and continuously along the central axis 4, the size of the turntable 1 matches the size of the air-core coil 2, and the central axis 4 of the turntable 1 coincid...

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Abstract

The invention discloses an air core coil mutual inductance coefficient error elimination method and application based on a rotation cancellation principle. The method comprises steps of enabling a rotating disc to rotate by 360 DEG/n relative to a current carrying lead, measuring a voltage of an air core coil, rotating the rotating disc by the same degree and measuring a voltage, and performing n times of rotation; obtaining mutual inductance coefficients according to voltage and current values; and performing weighted average of the mutual inductance coefficients to obtain the accurate mutual inductance coefficient value of the air core coil. The invention discloses an air core coil current measurement method. The air core coil mutual inductance coefficient error elimination method is used for obtaining the mutual inductance coefficient, the rotating disc is rotated at the same degree by many times to obtain multiple groups of voltages of the air core coil, currents are obtained according to the mutual inductance coefficients and the voltages, and the accurate value of a tested current is obtained by weighted average of the multiple groups of currents. Under a precondition that factors of the air core coil symmetry, the current carrying lead cross section, the tested current central position and the like are unknown, the instability of the mutual inductance coefficient is reduced, influences on currents can be eliminated, and the measurement accuracy of the air core coil is improved.

Description

technical field [0001] The invention relates to an error elimination method of a current sensor, in particular to an air-core coil mutual inductance error elimination method based on the principle of rotation cancellation and its application. Background technique [0002] The air-core coil has the advantages of no magnetic saturation, large measurement range, good linearity, and wide frequency bandwidth. It is a very competitive new type of current sensor. The air-core coil is an inductive sensor that measures current based on magnetic induction. , the mutual inductance coefficient is its most critical parameter. [0003] In the air-core coil, the secondary winding is wound on a non-magnetic skeleton, and there is no ferromagnetic material, so that the sensor still has excellent linearity in the range of a few amps to hundreds of kiloamperes. Unlike traditional CT, because it is not directly Measuring current, even if the measured current contains a large DC component, it w...

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Application Information

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IPC IPC(8): G01R19/00G01R35/02
CPCG01R19/00G01R35/02
Inventor 李红斌陈庆
Owner HUAZHONG UNIV OF SCI & TECH
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