Fiber grating-based transformer internal temperature detection system

Abstract

The invention provides a fiber grating-based transformer internal temperature detection system, which comprises a light source, fiber grating sensors, a grating signal demodulation system, a signal processing display instrument and data analysis software, wherein the fiber grating sensors are arranged on a winding and a strut of a transformer and sensing points at other positions in the transformer and used for sensing measurement of transformer temperature, stress and local discharge parameters; the grating signal demodulation system receives the measured data of the fiber grating sensors, and accurately demodulates corresponding light signals of the temperature, stress and local discharge parameters; the signal processing display instrument performs correction processing such as temperature compensation, stress sensitivity removal and the like on the measured signals, and displays real-time data on an instrument panel; and the data analysis software performs programming software analysis on the processed data to acquire real-time transformer internal temperature field and temperature change, and then performs transformer internal temperature monitoring and full service life assessment. The system realizes real-time measurement of temperature of multiple points in the transformer through the photoelectric sensors, and provides a good foundation for economic operation of the transformer.

Description

technical field [0001] The invention relates to the fields of optical fiber grating sensing and transformer state monitoring, in particular to a temperature detection system inside a transformer based on optical fiber gratings. Background technique [0002] Power transformers are important equipment in modern power systems, and the temperature of their windings is directly related to the service life of power transformers and the operation safety of power transmission and transformation systems. Therefore, each substation needs to monitor the temperature of the transformer. The insulation and aging rate of the transformer are related to the hot spot temperature of the winding. Exceeding the allowable limit of the temperature will not only reduce the operating life of the transformer, but also pose a threat to the safe operation of the transformer. If the temperature of the hot spot of the winding is too low, the capacity of the transformer will not be fully utilized, reducin...

AI Technical Summary

Problems solved by technology

Judging from the current research results, the temperature measurement error of the distributed optical fiber temperature measurement system is generally several degrees Celsius, and the positioning error is about one meter. For the monitoring of the internal temperature of the transformer, the positioning error is obviously larger

Images