Distributed temperature sensing in OPGW with multiple optical fibres

作     者：Carvalho, Renatto, V do Couto Bonfim, Marlio Jose Ussuna, Daniel A. Toledo, Luiz F. R. B. Martins, Rafael Filho, Vitoldo S. 

作者机构：Lactec Dept Mat Engn Curitiba Parana Brazil Univ Fed Parana Dept Elect Engn Curitiba Parana Brazil Companhia Paranaense Energia Eletr COPEL Substn Project Div Curitiba Parana Brazil 

出 版 物：《IET SCIENCE MEASUREMENT & TECHNOLOGY》 (IET科学、测量与技术)

年 卷 期：2019年第13卷第8期

页      面：1219-1223页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：Agencia Nacional de Energia Eletrica -ANEEL [6491-0263-2012] 

主　　题：optical cables temperature sensors refractive index fibre optic sensors temperature measurement calibration overhead line conductors power overhead lines distributed sensors Brillouin spectra OPGW multiple optical fibres maximum electrical current capacity overhead transmission line maximum sag thermal expansion electrical system real-time energy dispatch management Brillouin backscattering phenomena strain gradients distributed temperature measurement optical phase conductor overhead power transmission lines distributed temperature sensing equipment temperature monitoring refractive index fluctuation Ibipora-Londrina transmission line conductor temperature cables optical ground wire calibration algorithm calibrated sensors voltage 230 0 kV 

摘      要：The ampacity of a material is defined as its maximum electrical current capacity. In an overhead transmission line, it is related to the maximum sag that does not compromise its safe operation. As the sag depends on the conductor s temperature, with this parameter it is possible to estimate its ampacity, increasing the efficiency of the electrical system via real-time energy dispatch management. With the Brillouin backscattering phenomena, the distributed temperature measurement in the fibre inside the optical ground wire (OPGW) or optical phase conductor is possible. However, it is common for overhead power transmission lines to be composed by more than one optical fibre. A calibration algorithm was developed to enable the application of a distributed temperature sensing equipment to monitor the temperature of an OPGW with more than two different fibres. The 230 kV Ibipora-Londrina Transmission Line was used as a case study, being approximately 20 km long and composed of three different fibres spliced in series along with its extension. Through comparison with calibrated sensors, the technique and algorithm were validated. It was possible to characterize the system and perform the temperature monitoring with a spatial resolution of 1 m and amplitude error of less than 6 degrees C.