CN-121977717-A - Fluorescent optical fiber temperature measurement system for power equipment and AI intelligent temperature measurement method

CN121977717ACN 121977717 ACN121977717 ACN 121977717ACN-121977717-A

Abstract

The invention discloses a fluorescent optical fiber temperature measurement system for power equipment and an AI intelligent temperature measurement method, which comprise an intelligent sensor, a temperature sensor and an optical fiber link, wherein the intelligent sensor comprises a temperature measurement demodulation device and a data processing device, the temperature sensor is a fluorescent optical fiber temperature measurement probe, comprises a temperature measurement fluorescent region and a light absorption heating region which are contacted with each other, the temperature measurement demodulation device outputs excitation light to acquire a fluorescent signal to demodulate the temperature measurement temperature and outputs heating light to generate self-detection heat pulse, the data processing device calculates the temperature drop rate based on the temperature change after the pulse, the rate is smaller than a threshold value alarm, and the temperature is measured again after the rate is greater than or equal to a threshold value timing.

Inventors

ZHANG WENHUA
WU RUITAO
GE HONGRUI

Assignees

河北骁盾科技有限公司

Dates

Publication Date: 20260505
Application Date: 20260126

Claims (10)

1. The fluorescent optical fiber temperature measurement system for the power equipment is characterized by comprising an intelligent sensor, a temperature sensor and an optical fiber link; the intelligent sensor comprises a temperature measurement demodulation device and a data processing device; the temperature sensor is a fluorescent optical fiber temperature measurement probe which is used for being attached to a measured metal part of the power equipment, and comprises a temperature measurement fluorescence area and a light absorption heating area, wherein the temperature measurement fluorescence area and the light absorption heating area are in contact with each other in the fluorescent optical fiber temperature measurement probe; The temperature measuring demodulation device is used for outputting excitation light to the temperature measuring fluorescent region through the optical fiber link and receiving fluorescent signals to demodulate to obtain temperature measuring temperature, and is also used for outputting heating light to the light absorbing heating region through the optical fiber link to generate self-checking heat pulse; The data processing device is used for determining a temperature drop rate based on the temperature measurement temperature change after the self-checking heat pulse in each self-checking period, judging that the contact is poor and outputting a contact alarm when the temperature drop rate is smaller than a preset threshold value, judging that the contact is good and starting waiting time when the temperature drop rate is larger than or equal to the preset threshold value, and measuring the temperature again after the waiting time reaches a preset waiting time.
2. The system of claim 1, wherein the light absorbing heating zone is disposed around the thermometric fluorescent zone, and wherein the thermometric fluorescent zone is disposed in the center of the light emitting zone.
3. The fluorescent optical fiber temperature measurement system for the power equipment according to claim 1 or 2, wherein the light absorption heating zone is provided with a light absorption material layer, the light absorption material layer is an insulating heat conduction composite material layer, the insulating heat conduction composite material layer comprises a polymer matrix, a light absorption filler and a heat conduction insulating filler, the polymer matrix is silicon rubber or epoxy resin, the light absorption filler is carbon black, and the heat conduction insulating filler is boron nitride or aluminum nitride.
4. The fluorescent optical fiber temperature measurement system for electrical equipment according to claim 1 or 2, wherein the wavelength range of the excitation light and the wavelength range of the heating light are staggered from each other, and the minimum wavelength of the heating light is larger than the maximum wavelength of the excitation light.
5. The fluorescent fiber optic temperature measurement system of claim 4, wherein the excitation light has a wavelength in the range of 380 nm to 480 nm and the heating light has a wavelength in the range of 800 nm to 1100 nm.
6. An AI intelligent temperature measurement method applied to the fluorescent optical fiber temperature measurement system for the power equipment according to claim 1, which is characterized by comprising the following steps: Attaching a fluorescent optical fiber temperature measurement probe to a measured metal part of an electric device, wherein the fluorescent optical fiber temperature measurement probe comprises a temperature measurement fluorescence area and a light absorption heating area, and the temperature measurement fluorescence area and the light absorption heating area are in contact with each other in the fluorescent optical fiber temperature measurement probe; outputting excitation light to the temperature measurement fluorescent region and receiving fluorescent signals through the optical fiber link, and demodulating to obtain temperature measurement; heating light is output to the light absorption heating area through the optical fiber link to generate self-checking heat pulse, and a self-checking response temperature sequence is obtained in a preset acquisition time window after the self-checking heat pulse is generated; In each self-checking period, determining a temperature drop rate based on temperature measurement temperature change after the self-checking heat pulse, and inputting the self-checking response temperature sequence into an AI temperature measurement model when the temperature drop rate is smaller than a preset threshold value, wherein the AI temperature measurement model is used for outputting compensation temperature; And after the preset waiting time is elapsed, adding the measured temperature measured again to the compensation temperature to be used as a candidate measured temperature.
7. The method of claim 6, wherein the training of the AI thermometry model includes obtaining a set of historical samples, each historical sample in the set of historical samples including the self-test response temperature sequence, a thermometry temperature obtained after a preset wait period has elapsed, and an actual temperature measured by an additional temperature sensor at the thermometry temperature measurement.
8. The method of claim 7, wherein the model training process further comprises: inputting the self-checking response temperature sequence as a model; Subtracting the measured temperature from the actual temperature to obtain a compensated temperature label; And forming a supervision training sample by the model input and the compensation temperature label, and training the AI temperature measurement model.
9. The method of claim 8, wherein the AI thermometry model is a neural network model.
10. The method of claim 9, wherein the neural network model comprises a one-dimensional convolutional neural network having the self-test response temperature sequence as an input and outputting a sequence feature vector and a fully connected regression network having the sequence feature vector as an input and outputting the compensation temperature.

Description

Fluorescent optical fiber temperature measurement system for power equipment and AI intelligent temperature measurement method Technical Field The invention relates to the technical field of computers, in particular to a fluorescent optical fiber temperature measurement system for power equipment and an AI intelligent temperature measurement method. Background In the operation process of power equipment such as a switch cabinet, a circuit breaker and a transformer, metal parts such as a busbar joint surface, a contact surface, a conductive arm and the like are easy to generate local heat due to the change of contact resistance, so that temperature monitoring is an important means for state maintenance and fault early warning. The optical fiber temperature measurement is used for on-line temperature measurement under the strong electric field and strong electromagnetic environment because of the characteristics of insulation, electromagnetic interference resistance, long-distance transmission and the like. Especially, the temperature of the fluorescent optical fiber is measured, and the fluorescent material is irradiated by excitation light to generate a fluorescent signal, and then the intensity or attenuation characteristic of the fluorescent signal is demodulated, so that the temperature information of the measured point is obtained. Related demodulation methods, probe packaging structures, and mounting forms inside electrical equipment have been disclosed in various patents. For example, CN113607304a, an optical fiber temperature sensor, discloses an optical fiber temperature sensor scheme based on fluorescence intensity detection, which excites a special doped optical fiber by a pumping light source to generate a fluorescence signal, and receives the fluorescence intensity by a photodetector to realize temperature measurement. For another example, CN108692829B "temperature demodulation method and system based on fluorescent fiber" discloses the concept of acquiring the pulse signal of fluorescence afterglow, calculating the light intensity ratio, combining with a preset mapping table to obtain temperature demodulation, and further improving the stability of temperature calculation in a single measurement period through weighting calculation. The prior art focuses on demodulation algorithms for fluorescence temperature measurement, probe packaging reliability or arrangement modes inside equipment, and essentially still takes output temperature as a core target. However, for typical working conditions of the power equipment, the temperature measurement probe is usually required to be attached to a measured metal part, the measured temperature result is closely related to the true temperature of the measured point and the bonding heat conduction state between the probe and the metal, and the bonding interface may be degraded under the conditions of long-term operation, thermal cycle, vibration or installation stress change, so that deviation of the temperature measurement result occurs. In the prior art, an online judging mechanism matched with a fluorescence temperature measuring process and facing to the degradation of a bonding state is generally lacking, so that a system is difficult to distinguish the actual temperature rise of a measured point and the measurement deviation introduced by the change of the bonding state in time when outputting temperature data, thereby influencing the reliability of the temperature data when being used for state evaluation and alarm decision. Disclosure of Invention The invention aims to solve the technical problem of providing a fluorescent optical fiber temperature measurement system for power equipment and an AI intelligent temperature measurement method so as to solve the problem in the background technology. In order to achieve the above purpose, the invention adopts the following technical scheme: A fluorescent optical fiber temperature measurement system for power equipment comprises an intelligent sensor, a temperature sensor and an optical fiber link; the intelligent sensor comprises a temperature measurement demodulation device and a data processing device; the temperature sensor is a fluorescent optical fiber temperature measurement probe which is used for being attached to a measured metal part of the power equipment, and comprises a temperature measurement fluorescence area and a light absorption heating area, wherein the temperature measurement fluorescence area and the light absorption heating area are in contact with each other in the fluorescent optical fiber temperature measurement probe; The temperature measuring demodulation device is used for outputting excitation light to the temperature measuring fluorescent region through the optical fiber link and receiving fluorescent signals to demodulate to obtain temperature measuring temperature, and is also used for outputting heating light to the light absorbing heating region through the optical fiber l