A DC Leakage Current Sensor Based on Magnetic Modulation

A leakage current sensor and filter technology, used in instruments, measuring electricity, measuring electrical variables, etc., can solve problems such as large interference and complex signal processing circuit structure, and achieve the effects of reducing interference, easy detection, and improving sensitivity

Active Publication Date: 2017-12-22
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

[0003] In view of the above defects or improvement needs of the prior art, the present invention provides a DC leakage current sensor based on magnetic modulation, the purpose of which is to use half-wave excitation to simplify the signal processing circuit of the existing magnetic modulation DC leakage current sensor, thereby Solve the problem of complex structure and large interference in the signal processing circuit of the prior art DC leakage current sensor

Method used

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  • A DC Leakage Current Sensor Based on Magnetic Modulation
  • A DC Leakage Current Sensor Based on Magnetic Modulation

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Embodiment Construction

[0028] 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.

[0029] The basic circuit structure of the DC leakage current sensor of the embodiment of the present invention is as follows: figure 1 As shown, it includes a square wave oscillation circuit 1, a diode 2, a primary winding coil 8, a secondary winding coil 9, two magnetic cores, a band-pass filter 3, an instrument amplifier 4, a phase-sensitive detector 5, and a low-pass filter 6. The coil 8 of ...

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Abstract

The invention discloses a DC leakage current sensor for magnetic modulation, which has good performance for monitoring DC insulation conditions. The DC leakage current sensor includes an oscillating circuit, a diode, a double magnetic core differential unit, a first filtering device, instrument amplifier, phase-sensitive detector and the second filter; the DC leakage current sensor of the present invention adopts half-wave excitation, compared with the traditional sensor, omits the frequency multiplication circuit for generating the reference signal of the phase-sensitive detector , simplifies the circuit structure, reduces interference, reduces cost, and has the characteristics of high sensitivity.

Description

technical field [0001] The invention belongs to the technical field of insulation monitoring of electronic power equipment, and more specifically relates to a DC leakage sensor based on magnetic modulation. Background technique [0002] In electronic power equipment, it is necessary to monitor the DC insulation status in real time to prevent leakage, so as to protect electronic equipment and personal safety. At present, DC leakage current sensors are mostly used for monitoring. The DC leakage current sensor in the prior art is mainly based on the principle of magnetic modulation. A coil is wound on a high-permeability annular magnetic core, an excitation signal is passed through the primary coil to excite the magnetic core, and the detected DC current passes through the magnetic core. center. When the measured DC signal is zero, the induced voltage of the secondary coil is a voltage signal with a symmetrical waveform; when the measured DC current signal is not zero, the ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/02
Inventor 王隆伟王鲜冯则坤聂彦
Owner HUAZHONG UNIV OF SCI & TECH
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