Direct-current leakage current sensor based on magnetic modulation

A leakage current sensor and filter technology, applied in the direction of instruments, measuring electricity, measuring electrical variables, etc., can solve the problems of complex signal processing circuit structure, large interference, etc., and achieve the effects of easy detection, reduced interference, and reduced cost

Active Publication Date: 2015-04-15
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
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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 th...

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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 direct-current leakage current sensor based on magnetic modulation. The direct-current leakage current sensor is used for monitoring direct-current insulation condition, and has good performance. The direct-current leakage current sensor comprises an oscillating circuit, a diode, a double magnetic core differential motion unit, a first filter, an instrument amplifier, a phase sensitive detector and a second filter. The direct-current leakage current sensor disclosed by the invention adopts half-wave simulation; compared with a traditional sensor, a frequency multiplier circuit for generating phase-sensitive detector reference signals is eliminated, the circuit structure is simplified, the inference as well as the cost is reduced, and the direct-current leakage current sensor has the characteristic 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...

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Application Information

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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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