Research on a new fiber-optic axial pressure sensor of transformer winding based on fiber Bragg grating

Abstract

Based on the principle of the fiber Bragg grating, a new type of fiber-optic pressure sensor for axial force measurement of transformer winding is designed, which is designed with the structure of bending plate beam, the optimization of the packaging process, and material of the sensor. Through the calibration experiment to calibrate the sensor, the field test results of the Taikai transformer factory show that the sensitivity of the sensor is 0.133 pm/kPa and the repeatability error is 2.7% FS. The data of the fiber-optic pressure sensor in different positions maintain consistent and repeatable, which can meet the requirement of the real-time monitoring of the axial force of transformer winding.

Static and Dynamic Evaluation of a Winding Deformation FBG Sensor for Power Transformer Applications

“…Figure 2 shows the sensor conception. This shape is an evolution of the shape described in [18]. The sensor consists in a rectangular block of a special material where an empty dome is designed inside the block.…”

“…Liu et al [18] described a study to identify the dynamic strains in a transformer iron core using FBG sensor, while Kuhn et al [19] described an FBG axial pressure sensor used for monitoring transformer windings.…”

“…These materials are suitable for power transformer sensing devices due excellent mechanical, electric, thermal and chemical characteristics. The proposed new geometrical design of the deformation sensor has an inverted dome when compared with former reference [18]. A flat cylinder on the top of the sensor is also introduced.…”

High-Resolution Fibre Bragg Grating (FBG) Pressure Transducer for Low-Pressure Detection

“…Regarding this, various encapsulation methods with diverse temperature compensation techniques were reported. Polymer filled structure [17][18][19][20], cantilever beam structure [13,21], metal bellows structure [1,22,23] and diaphragm-based structure [10,16,[24][25][26] appeared to be favourable to most researchers. Pachava et al [1] bonded two FBGs to a metal bellow, where one of the FBGs is to sense the pressure strain while the other is to compensate the temperature variations.…”

Effects of Degraded Optical Fiber Sheaths on Thermal Aging Characteristics of Transformer Oil

“…Optical fiber sensors in transformers, based on the fiber Bragg grating (FBG), fluorescence, the Brillouin scattering principle, and Raman scattering principle, are used to measure the partial discharge, temperature, and winding deformation [19][20][21][22][23]. Ordinary optical fiber sheaths, such as polyethylene, low-smoke zero-halogen, and polyvinyl chloride have successively been used in the field of communications [24].…”