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Optical current sensor

A technology of current sensor and photodetector, applied in voltage/current isolation, measuring current/voltage, instruments, etc., can solve the problems of difficult processing of optical glass sensor heads, affecting the sensitivity of the measurement system, and affecting the performance of the measurement system, etc. Achieve the effect of facilitating real-time online monitoring, improving sensitivity, and

Inactive Publication Date: 2009-01-28
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The sensor uses optical glass as the sensor head, and its main disadvantages are: the processing of the optical glass sensor head is difficult, fragile and costly; the reflection phase shift introduced by the reflection of light in the magneto-optical glass material and the Stress birefringence caused by temperature changes will turn linearly polarized light into elliptically polarized light, resulting in unnecessary changes in light intensity, causing deviations, and thus affecting the performance of the measurement system; the Verdet constant of magneto-optic glass is low, Affects the sensitivity of the measurement system

Method used

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Embodiment 1

[0026] like Figure 1~5 As shown, an optical current sensor mainly includes a sensor head, a polarized light system, a signal detection system, a power supply, and the like. The sensor head is a magnetic ring optical sensor head, which is composed of a magnetic ring 2, a liquid pool 3 and a ferrofluid. The magnetic collecting ring is an open ring of electrical steel sheet of grade 1511. The inner diameter of the open ring is 90mm, the thickness is 30mm, the width is 20mm, and the width of the open air gap is 9.9mm. At the center of the quasi-end face, a small square hole with a side length of 1.8 mm is respectively provided to insert the pin 8 of the input optical fiber 13 and the pin 12 of the output optical fiber 14 of the polarization system respectively. The centers of the two square apertures are on a straight line with the center of the flange embedded in the center of the front frame 31 of the liquid pool 3 and the center of the flange embedded in the center of the rea...

Embodiment 2

[0031] An optical current sensor, the same as embodiment 1, is characterized in that: the magnetic collecting ring of the magnetic collecting ring optical sensor head is an electrical steel sheet opening ring of brand 1512, the inner diameter of the opening ring is 92.4mm, the thickness is 35mm, and the width The width of the open air gap is 10 mm, the side length of the square hole is 2 mm, and the thickness of the spacer 35 is 25 μm. The ferrofluid is diluted to a ferrofluid with a mass concentration of 10%. The semiconductor laser light source of the polarization system produces a monochromatic light source with a wavelength of 650nm and an output power of 5mw with high stability.

Embodiment 3

[0033] An optical current sensor, the same as embodiment 1, is characterized in that: the magnetic collecting ring grade of the magnetic collecting ring optical sensing head is an electrical steel sheet opening ring of 1512, the inner radius of the opening ring is 94mm, the thickness is 40mm, and the width The width of the open air gap is 10.1 mm, the side length of the square hole is 2.2 mm, the thickness of the spacer 35 is 50 μm, and the mass concentration of the ferrofluid is 31.2% ferrofluid. The semiconductor laser light source produces a monochromatic light source with a stable wavelength of 652nm and an output power of 3mw.

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Abstract

The invention provides an optical current sensor, relating to current detection equipment. The optical current sensor mainly comprises four parts: a magnet collecting ring optical sensing head, a polarized light system, a signal detection system and a power supply; as the optical current sensor of the invention has the advantages of high sensitiveness, quick response, high measurement exactness, low cost, online monitoring changes of the current amplitude and frequency of conductors to be measured in real time, facilitating the connection with digitizer, realizing the real-time online monitoring of computer and the like, the optical current sensor of the invention can be widely applied to the detection of power system transmission currents and currents used for large mine enterprises, especially for the current detection of high voltage and ultra-high high voltage power network.

Description

technical field [0001] The invention belongs to the technical field of current detection, in particular to current detection equipment. Background technique [0002] With the development of the power system, the system capacity continues to increase, and the operating voltage level of the power grid is also getting higher and higher. Current transformer is an important equipment for electric energy measurement, relay protection, control and monitoring in the power system, its accuracy and reliability are closely related to the safe, reliable and economical operation of the power system. [0003] At present, the domestic current transformers used for current measurement and line fault protection in the electric power industry are all traditional oil-immersed electromagnetic current transformers, which are more and more difficult to solve technically due to their working principle: With the The increase in voltage level increases the difficulty of insulation, resulting in com...

Claims

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Application Information

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IPC IPC(8): G01R15/24G01R19/00
Inventor 杜林王世彬孙才新陈伟根王有元廖瑞金李剑
Owner CHONGQING UNIV
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