Fiber grating sensor based on settlement measurement of transformer substation

Abstract

The invention discloses a fiber grating sensor based on settlement measurement of a transformer substation. The fiber grating sensor comprises a first connecting piece (1), an optical fiber Bragg grating (2), a second connecting piece (3), an extension spring (4) and a third connecting piece (5) which are connected in sequence from top to bottom, wherein the first connecting piece (1) is also fixedly connected to a reference point on a reference plane; the third connecting piece (5) is also fixedly connected with precipitates of the transformer substation. Compared with the prior art, an optical fiber settlement sensor can be used for accurately converting settlement displacement into tensile stress acting on the optical fiber Bragg grating, further converting the tensile stress into an optical parameter transmitted in an optical fiber, and obtaining an accurate settlement displacement by solving a transmission optical spectrum, so that the working efficiency of working personnel is increased, and a large amount of settlement data is acquired in real time; the monitoring time is short, the influences of severe environments are avoided, and the accuracy is increased greatly.

Description

technical field [0001] The invention relates to an optical fiber grating sensor, in particular to an optical fiber grating sensor based on substation subsidence measurement. Background technique [0002] The substation is an important part of the power grid. It plays the role of transforming voltage, receiving and distributing electric energy, controlling the flow of electric power and adjusting voltage in the power system. The buildings in the substation are the power infrastructure to ensure the safety of the power grid. Since the substations are mostly built in remote areas, the geological and climatic conditions there often cause the foundation of the substation to settle. The safety problems of substation basic buildings during construction and later operation are becoming more and more prominent. At present, the monitoring method of substation foundation settlement mainly adopts level monitoring method. This method is to judge the amount of foundation settlement by m...

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Problems solved by technology

The compressive stress in this patent is transmitted to the fiber Bragg grating perpendicular to the axial direction. Due to the low resolution and small strain of the fiber Bragg grating perpendicular to the axial direction, it is found through experiments that the measurement range of the settlement sensor is the largest. It is about 100mm, the sensitivity is about 150-160pm / mm, and the settlement displacement resolution is 1.2-1.3mm. Therefore, it is easy to cause the fiber Bragg grating to break, and there are insufficient stability and practical life.

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