Optical fiber sensing system for dissolved gas in transformer bushing oil

Abstract

The invention provides an optical fiber sensing system for dissolved gas in transformer bushing oil. The optical fiber sensing system comprises a light source, a circulator, a 2 * 2 coupler, an erbium-doped optical fiber amplifier, a first 1 * 2 coupler, a delay optical fiber, a gas sensing module, a second 1 * 2 coupler, an acousto-optic modulator, an acousto-optic modulator driver, a balanced photoelectric detector, a data collector and an upper computer, the gas sensing module is composed of a ceramic membrane and a hollow photonic crystal fiber, the ceramic membrane coated with a high polymer material can achieve efficient oil-gas separation, and the hollow photonic crystal fiber can serve as a gas chamber for interaction of light and gas. And the gas sensing module is arranged in the transformer bushing oil conservator, so that the time of convection diffusion of fault gas to the gas sensing module is shortened. According to the invention, the real-time performance of online monitoring is improved, the performance requirements on the light source and the balance photoelectric detector are reduced while higher sensitivity and lower limit of detection are ensured, and the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of optical sensing systems, and in particular relates to an optical fiber sensing system for dissolved gas in transformer bushing oil. Background technique [0002] Dissolved gas analysis in transformer bushing oil is an important means to judge the running state of transformer bushing. By monitoring the type and content of dissolved gas in the transformer bushing oil, the fault type and severity of the transformer bushing can be diagnosed, and the early latent faults inside the oil-immersed transformer bushing can be predicted. This puts forward higher requirements for the real-time, accuracy and lower detection limit of the online monitoring device for dissolved gas in the transformer bushing oil. The on-line monitoring technology of dissolved gas in transformer bushing oil mainly includes oil-gas separation technology and multi-component gas detection technology. [0003] The two main problems restricti...

AI Technical Summary

Problems solved by technology

Gas chromatography requires chromatographic columns to separate gases, consumes carrier gas, and cannot achieve continuous measurement

Although the cost of semiconductor sensors is low, their performance will gradually change during long-term use, and they need to be calibrated and replaced regularly, and cross-sensitivity between gas components is prone to occur, resulting in a decrease in detection accuracy

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