Dispersive spectrum device for SF6 gas detection

A gas detection, SF6 technology, applied in measurement devices, color/spectral characteristic measurement, analysis of materials, etc., can solve the problems of poor stability, low detection sensitivity, oil and gas separation, etc., to achieve stable baseline, improve stability, and eliminate fluctuations. Effect

Pending Publication Date: 2020-10-09
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

[0007] The invention provides a dispersive spectroscopic device for SF6 gas detection to solve the problems of poor stability, low detection sensitivity and the need for oil and gas separation before detection in the prior art

Method used

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  • Dispersive spectrum device for SF6 gas detection

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Embodiment

[0054] In this embodiment, a Kagome-type hollow fiber is used, a controller (not shown in the figure) of the model CLD1015 drives a distributed feedback laser diode, and a radio frequency spectrum analyzer (not shown in the figure) of the model FSV7 is used for illustration.

[0055] Kagome-type hollow-core fiber has two wider transmission bandwidths, the first one is between 2um-2.4um, the second one is between 2.8um-3.5um, the core diameter is 116um, and there are customized air chambers at both ends of the fiber , to facilitate the entry and exit of gas. Kagome-type hollow-core fiber has the characteristics of near-single-mode transmission, low dispersion, low loss, high power withstand, and wide-band transmission.

[0056] Such as figure 1 As shown, firstly, the first distributed feedback diode of the single-wavelength tuning module outputs a laser with a center wavelength of 1562nm, which is amplified by the first optical fiber amplifier (AMP1), and then modulated by a h...

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Abstract

The invention provides a dispersive spectrum device for SF6 gas detection. The device comprises a single-wavelength tuning module, a controller, a frequency conversion module, a gas detection module and a radio frequency spectrum analyzer; the single-wavelength tuning module comprises a distributed feedback laser diode, an optical fiber amplifier and a high-speed electro-optical modulator; the controller is used for driving the distributed feedback laser diode; the frequency conversion module comprises an optical fiber coupler and an optical fiber phase matching mechanism; the gas detection module comprises a hollow optical fiber, a hollow optical fiber gas chamber, a gas pump, a vacuum pump, a pressure gauge, a lens and an intermediate infrared detector; the radio frequency spectrum analyzer is used for detecting a phase signal. According to the invention, a chirp dispersion spectrum technology based on a Kramers-Kronig relationship is adopted; the gas concentration is measured by measuring the refractive index fluctuation caused by the gas absorptivity; two sideband signals are generated by a high-speed electro-optic speed regulator for interference; and the gas concentration ismeasured by detecting the reverse phase of an interference signal.

Description

technical field [0001] The invention relates to the technical field of on-line monitoring and fault diagnosis of electrical equipment insulating gas, in particular to a dispersive spectrum device for SF6 gas detection. Background technique [0002] Sulfur hexafluoride (SF6) is widely used in gas-insulated power equipment as an ideal insulating and arc-extinguishing gas. It is usually used in SF6 circuit breakers, sulfur hexafluoride closed combined electrical appliances (GIS), SF6 load switchgear, SF6 insulated transmission pipelines, SF6 transformers and SF6 insulated substations, 80% of which are used in high and medium voltage power equipment. Pure SF6 has stable chemical properties, its electric resistance is 2.5 times that of nitrogen under the same pressure, its breakdown voltage is 2.5 times that of air, and its arc extinguishing ability is 100 times that of air. A generation of ultra-high voltage insulating dielectric materials. However, during the long-term operat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39G01N21/25G01N21/01
CPCG01N21/39G01N21/255G01N21/01G01N2021/399G01N2021/0112G01N2201/08G01N2201/0612
Inventor 彭庆军沈龙王树超钱国超郑易谷王建新周兴梅陈伟根
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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