Optical fiber temperature sensor used for oil-immersed transformer winding

Abstract

An optical fiber temperature sensor used for an oil-immersed transformer winding is disclosed. The sensor is characterized in that the optical fiber temperature sensor is formed by two protection pipes, two fixed caps and a transmission fiber; a fiber bragg grating is arranged in the transmission fiber; the two protection pipes are connected to the two fixed caps respectively, and the two protection pipes are in a hollow state; a center through hole is arranged in one fixed cap and a groove is arranged in another fixed cap; the transmission fiber is penetrated from a center through hole of the protection pipe, then enters into another protection pipe through the center through hole of the fixed cap and enters into the fixed cap through the protection pipe and the groove connected to another fixed cap; components are formed through one of mechanical connection, bonding agent connection and welding connection or combination of the above connection modes. The sensor has advantages that packaging is simple; installation and interchange are convenient; there is no error; temperature drift is not generated during long-term operation; and recalibration is not needed.

Description

technical field [0001] The invention relates to the technical field of optical fiber grating sensing, relates to a temperature sensor based on optical fiber gratings, and in particular to an optical fiber temperature sensor for oil-immersed transformer windings for temperature measurement in an electric high-voltage environment. Background technique [0002] During the operation of power equipment, it is affected by factors such as electricity, heat, natural environment, long-term work, overload work, etc., which can easily lead to equipment aging, performance degradation, lower reliability, and even endanger the safe operation of the system. For example, due to poor contact in transformers, switch cabinets, ring network cabinet contacts or cable joints, the contact resistance increases, resulting in excessive temperature rise of the contacts, causing fires, explosions and other accidents. Therefore, it is necessary to carry out real-time and online monitoring of power e...

AI Technical Summary

Problems solved by technology

Considering that the bare fiber grating is particularly fragile, especially its poor shear resistance, directly using it as a temperature sensor is not suitable for sensor layout and harsh service environments. Therefore, packaging the bare fiber grating is to promote the fiber grating as a temperature sensor. an inevitable part of the application

[0004] The traditional temperature measurement methods in the power industry generally include thermocouples / thermal resistances installed at temperature measurement points or some point-type temperature measurement devices, infrared temperature measurement devices have manual inspection, etc. These methods are limited by their own temperature measurement principles Inevitably, there are some insurmountable defects, such as only reflecting the temperature of local locations, the test range is limited; there are requirements for installation space, cumbersome and unreliable; susceptible to electromagnetic interference, affecting accuracy, etc.

Therefore, the traditional temperature measurement method and equipment cannot meet the advantages of adapting to various harsh chemical environments in the power industry and being free from electromagnetic interference. It can directly contact various contacts and connection points of electrical equipment to sense the temperature at the location. monitoring needs

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