Due to the complex multi-physics environment inside the oil-immersed pressure transformer

common fiber grating sensor structures such as metal diaphragm or F-P air cavity type cannot be used for the sensory measurement of internal pressure.Aiming at the long-term high-temperature oil-immersed electromagnetic environment

a high-sensitivity fiber grating sensor structure that can measure the pressure in a single direction in the oil is proposed.Next

this article establishes the static strain model of the sensor structure and the thermal expansion model of the polymer

and analyzes it with FEM simulation.The results show that the designed structure can accurately measure the pressure.In addition

it can effectively avoid the problem of reduced sensitivity of the traditional enhancing sensitivity pot due to the thermal expansion of the polymer.This paper provides a practical idea for the design of the sensor structure used for the internal pressure measurement of oil-immersed power transformers.With the corresponding rubber polymer

it can be used to directly measure the pressure at various positions in the oil

and will not pose a threat to the transformer’ s internal insulation.