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Switching arc magnetic field measurement device and method based on magneto-optic imaging

A switching arc and magnetic field measurement technology, applied in measuring devices, measuring magnetic variables, instruments, etc., can solve the problems of inability to intuitively and accurately measure arc shape, low precision, etc., and achieve excellent electrical insulation performance and anti-interference, high space and the effect of time resolution

Inactive Publication Date: 2011-11-23
XI AN JIAOTONG UNIV
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Problems solved by technology

At present, a key problem in the practical application of this technology is: the magnetic sensor is limited by the size of the space, and the accuracy is very low. It can only be used to determine the position of the arc, and cannot directly and accurately measure the shape of the arc.

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  • Switching arc magnetic field measurement device and method based on magneto-optic imaging
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  • Switching arc magnetic field measurement device and method based on magneto-optic imaging

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Embodiment Construction

[0024] see figure 1 , the present invention comprises a laser 1 and a polarizer 2, a beam expander lens group 3, an optical path separator 4 and a magneto-optical glass 5 which are sequentially arranged on the optical path axis of the laser 1 emitting beam, and the optical path of the reflected beam of the optical path separator 4 An analyzer 6, a focusing lens group 7, a diaphragm 8 and a CCD camera 9 are sequentially arranged on the axis. The CCD camera 9 is connected to the image data processing system 10, and the magneto-optical glass 5 is placed on the switch to be measured. In the induced magnetic field of the arc, the surface of the magneto-optical glass 5 close to the switching arc is provided with a total reflection film that reflects the incident polarized light back to the optical path separator 4 along the opposite direction of the optical path;

[0025] The optical path separator 4 is made of one-way glass, and the surface close to the magneto-optical glass 5 is a...

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Abstract

The invention belongs to a switching arc testing technology, and relates to a switching arc magnetic field measurement device and method based on magneto-optic imaging. The measurement device comprises a laser, a polarizer, an expanded beam lens group, a light path separator, magneto-optic glass, an analyzer, a focusing lens group, a diaphragm, a CCD (Charge Coupled Device) camera and an image data processing system. In the device, on the basis of the magnetic rotation effect of a magneto-optic sensitive element and the polarization property of light, the magnetic field distribution around the arc is converted into a grey image of polarized light, and real-time measurement on the magnetic field around the arc is realized by a numerical image processing method with high space and time resolution. The method belongs to a nonintrusive detecting method, ensures that the structure of an arc extinguish chamber of a low-voltage switching electric appliance is not destroyed, has the characteristics of excellent electric insulation performance, interference resistance and the like, and can be used for experimental study and optimized design of low-voltage switching electric appliance products.

Description

technical field [0001] The invention belongs to the technical field of modern switch arc testing, and in particular relates to a switch arc magnetic field measurement device and a measurement method based on magneto-optical imaging. Background technique [0002] Low-voltage switchgear is the most important control and protection equipment in the power supply system. Economic development and social progress have put forward higher requirements for the economy, safety and automation of switchgear operation, prompting low-voltage switchgear to high-performance, The direction of miniaturization and intelligence is developing. Technological innovation and application of new technologies are the important basis for this development, because many important physical parameters, boundary conditions and initial conditions in the simulation model of switching arc still need to be obtained from prototype test research. It is too early to realize the design of switchgear by relying sole...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/10
Inventor 张国钢张鹏飞耿英三杨博宇王序辰刘恺
Owner XI AN JIAOTONG UNIV
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