Research on performance evaluation method of distributed optical fiber temperature sensing device for high voltage cable

In view of the problem that the distributed optical fiber temperature measurement device of high voltage cable cannot systematically carry out instrument calibration and performance evaluation,in this paper,a performance evaluation method of distributed optical fiber temperature measurement device is proposed.Based on this method,an intelligent verification platform based on automatic temperature control and acquisition is developed,where the calibration environment of distributed optical fiber temperature measurement device is built by using the programmable constant temperature water bath.At the same time,the main technical indicators of the system,such as temperature measurement accuracy,spatial resolution,temperature resolution and positioning accuracy,are verified.This method is used to make automatic performance evaluation for distributed optical fiber temperature measurement device for high-voltage cables in Liaoning Province.The results of horizontal comparison show that the accuracy,resolution and repeatability of temperature measurement of each device meet the specification requirements,but the data consistency between different devices is poor.Combined with the evaluation results,suggestions are put forward for accuracy improvement method and field calibrating method of distributed optical fiber temperature measurement device.