A High-Precision Arbitrary Waveform Electromagnetic Current Transformer and Measurement Method
A technology of current transformer and arbitrary waveform, which is applied in the direction of voltage/current isolation, measuring device, and current-only measurement. It can solve the problems that the current transformer is easy to saturate and cannot accurately measure the current containing the DC component, and achieves simple structure, The effect of improving the measurement range of AC current and high maturity of related technologies
Active Publication Date: 2021-02-19
WUHAN UNIV
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[0007] Aiming at the above defects or improvement needs of the prior art, the present invention proposes a high-precision arbitrary waveform electromagnetic current transformer and a measurement method, thereby solving the problem that the traditional current transformer is easy to be saturated and cannot accurately measure the current containing a DC component, etc. technical problem
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[0027] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0028] The present invention provides a high-precision arbitrary waveform electromagnetic current transformer, which includes a semi-open closed iron core 1, a magnetic field sensor 5, a primary winding 2, a secondary winding 3, a signal processing module and a standard resistor 4;
[0029] Such as figure 1 As shown, the semi-open closed iron core 1 opens one or several air gaps in the height d...
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The invention discloses a high-precision arbitrary waveform electromagnetic current transformer and a measurement method, which belong to the field of electric current measurement. The electromagnetic current transformer includes: a half-open closed iron core, a magnetic field sensor, a primary winding, a secondary winding, a signal Process modules and standard resistors; divide the core into small section and large section by opening one or several air gaps on the core, so that the iron core of the large section is not easy to saturate, and the primary current measurement range is expanded. The acquisition of the magnetic field strength signal in the gap, combined with the secondary current signal, restores the output voltage signal proportional to the primary current signal through the signal processing module, which solves the problems that the traditional current transformer is easy to saturate and cannot accurately measure the current containing the DC component. .
Description
technical field [0001] The invention relates to current measurement in the electrical field, and more specifically, to a high-precision arbitrary waveform electromagnetic current transformer and a measurement method. Background technique [0002] At present, P-type electromagnetic current transformers are widely used in power systems to measure current. Its working principle is similar to that of a transformer, and it is measured by converting a large current into a small current proportionally through electromagnetic induction. In the case that the iron core is not saturated, the electromagnetic current transformer has high measurement accuracy. [0003] However, when the power system fails, the primary current of the current transformer may reach several times or even dozens of times that of normal operation, and often contains transient DC components, which will quickly saturate the iron core and greatly increase the excitation current. At this time, the traditional P-t...
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IPC IPC(8): G01R19/00G01R15/20
CPCG01R15/202G01R15/205G01R19/0092
Inventor 陈柏超田翠华陈耀军吴凡
Owner WUHAN UNIV